A Mechanic's Life - Tales From Under the Hood

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Comments

  • isellhondasisellhondas Member Posts: 20,342
    I wouldn't encourage anyone to go into the auto repair business today.

  • steverstever Guest Posts: 52,454
    edited February 2015
    "Greater reliance on computer diagnostics".

    So, like a lot of other industries, more computer power will mean fewer humans will be needed. The computer will tell the tech what component needs to be pulled and sent back to the central depository for recycling and after the part is replaced, the computer will check the tech's work.

    After that model fails, robotics will do the work. B)

    Meanwhile if repair prices rise, people will just switch to leasing and zipcars and Uber rides.
  • thecardoc3thecardoc3 Member Posts: 5,850
    edited February 2015
    stever said:


    Meanwhile if repair prices rise, people will just switch to leasing and zipcars and Uber rides.

    So exactly how does that rescue the consumer from the expense of repair and maintenance? Do you really believe those costs wouldn't factor into the pricing of those other sources of transportation?

  • isellhondasisellhondas Member Posts: 20,342
    And where will those leased cars end up at the end of those leases?

    As used cars of course!
  • thecardoc3thecardoc3 Member Posts: 5,850

    And where will those leased cars end up at the end of those leases?

    As used cars of course!

    Unless of course there are no technicians to service them and ensure that they are ready for the road. Then they will be throw-away's and the cost of the lease will surely reflect that.
  • steverstever Guest Posts: 52,454
    edited February 2015
    Parts is parts. They'll get recycled (by rail) and the materials shipped back out the 3D printers to make more car components.

    Right now cars are assembled to speed up the lines with little regard for maintenance and repair (check out the location of the new Mustang dipstick). That's nuts - at some point someone (Tesla?) will figure out that it's smarter to make it all modular and "plug and play".

    Ten years ago people hardwired their houses with Cat 5 to future proof them. Now it's all wireless. Got an intermittent battery problem? It's nuts to have to put a car up on a lift and check 40 odd grounds for a good connection. If you can't get rid of all the wiring, at least have the ECU tell you where the bad ground is.

    Why isn't your car sending performance data back home? Your fridge does it (got milk?) - your toilet does it (BP right to your doc's office). Why do you have to have an OBD port? That info should be sent to your phone or your nav screen.

    More EVs will solve a lot of maintenance issues too.
  • thecardoc3thecardoc3 Member Posts: 5,850
    stever said:

    It's nuts to have to put a car up on a lift and check 40 odd grounds for a good connection. If you can't get rid of all the wiring, at least have the ECU tell you where the bad ground is.

    The short sighted part of all of that is that the computer cannot test past its connector. If you have a ground circuit issue then there will be a measurable voltage drop on that ground. But when that voltage drop occurs, the most likely result is the circuit (and likely the computer itself) shuts down and is therefore no longer active to even try to provide any diagnostic direction. Which brings us back to the job of the technician, it isn't to physically address each ground connection on the assumption that one of them is the cause. The technician needs to use experience, training, the right tools and the critical thinking skills to logically and efficiently identify the cause of the failure and effect a repair. In other words figure out which of your forty ground circuits is the issue with as little pinpoint testing as possible. In the chicken or the egg comparison, the technicians only develop the skills to do the work by growing inside the trade by doing the work. Without a career track that supports them learning and earning a living, the argument about which comes first is meaningless because just like the chicken and the egg, without both you have neither.
  • steverstever Guest Posts: 52,454
    I think we already hit at self-healing electronics a while back.

    Cars are ready for a sea-change. Repair techs won't be left behind so much as they won't even be a cog in the wheel anymore.

    Having miles of wiring in a car that's subjected to weather extremes, dirt and vibration doesn't make a lot of sense anyway. (Neither does carrying around 100 gallons of highly combustible fluid in traffic!).
  • Mr_ShiftrightMr_Shiftright Member Posts: 64,481
    edited February 2015
    Many people are already ditching cars in the big cities. Just look at these amazing stats:

    Percentage of Households Without a Car in USA

    Obviously if you are an auto tech, you want to a) specialize so as to master a certain marque and b) move to the 'burbs.

    And if you are an owner of a new car, you probably want to bail out of it right after the warranty, if it's loaded up with all the conceivable gadgetry.

    I can foresee the day when "out of warranty" will have the same impact financially as "salvage title".
  • thecardoc3thecardoc3 Member Posts: 5,850


    And if you are an owner of a new car, you probably want to bail out of it right after the warranty, if it's loaded up with all the conceivable gadgetry.

    I can foresee the day when "out of warranty" will have the same impact financially as "salvage title".

    Like the Mercedes? http://forums.edmunds.com/discussion/32310/mercedes-benz/cl-class/brake-pad-abc-and-check-engine-warning-lights-2005-mercedes-benz-cl65-amg-long-term-road-test#latest

    With all of the dynamics in play the only thing that is certain is like isellhondas said, there is no reason for someone to become a technician. Dealership techs aren't being paid correctly for neither the diagnostics nor the repairs. Just look at the other threads about the failed repairs that are requiring multiple visits. For all of the consumer complaints nothing is being done to address the real problems.
  • Mr_ShiftrightMr_Shiftright Member Posts: 64,481
    The consumer has every right to complain. The sign outside the dealership says "Mercedes Service". How might you feel if you went to the dentist's office --- Dr. Amos P. Glover DDS-- and he drilled the wrong tooth or threw up his hands and said "Gee, I dunno...."?
  • thecardoc3thecardoc3 Member Posts: 5,850
    Nice straw man.

    BTW where did someone say that the consumers don't have a right to complain? Now maybe if they focused their objections on the parties that really deserve to feel the pressure instead of it being misdirected.
  • Mr_ShiftrightMr_Shiftright Member Posts: 64,481
    It's not a straw man at all. If you can't fix the cars, don't hang the sign. When I take my car to a "brake specialist" I expect it to be done right, efficiently and on budget.
  • thecardoc3thecardoc3 Member Posts: 5,850
    Anyone can do the easy stuff, there is no shortage of options for the easy stuff. In fact the argument can be made that there are too many of those shops all competing for the same shrinking piece of the pie. There is no licensing, no minimum standard, no career path to guide the techs from being able to do your brake job to being able to handle the problems that Edmund's Mercedes presented.
  • explorerx4explorerx4 Member Posts: 20,800
    2024 Ford F-150 STX, 2023 Ford Explorer ST, 91 Mustang GT vert
  • thecardoc3thecardoc3 Member Posts: 5,850
    LOL.
  • steverstever Guest Posts: 52,454
    Is that the same guy who got a Land Rover from CarMax and has rolled up big bucks on their extended warranty?
  • MichaellMichaell Moderator Posts: 263,730
    stever said:

    Is that the same guy who got a Land Rover from CarMax and has rolled up big bucks on their extended warranty?

    No, Doug DeMuro is the guy who bought the LR from CarMax.

    This guy likes to point out how much used car you can get for new car money ... I've seen several different articles from him the past few months.

    Love to point him to the Edmunds experience with a similar MB.

    Edmunds Price Checker
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    Did you get a good deal? Be sure to come back and let us know! Post a pic of your new purchase or lease!


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    2015 Subaru Outback 3.6R / 2024 Kia Sportage Hybrid SX Prestige

  • Mr_ShiftrightMr_Shiftright Member Posts: 64,481
    Doesn't anyone anymore ask the obvious question: "Why is this fantastic car so cheap?"

  • thecardoc3thecardoc3 Member Posts: 5,850
    edited February 2015
    No the question that they end up asking is "What do you mean it costs $3X,000 to put an engine in this. I only paid $2X000 for the whole car!!"
  • steverstever Guest Posts: 52,454
    edited February 2015
    So, do you wanna be a lube tech or service writer in your "declining" years Doc? I think I'd rather chat up the customers and retire the tools entirely.

    The express service seems to be the wave of the future - brakes and oil, fine. Anything else (aka a "major" issue) will get towed (or unplugged) and sent to a central rehab joint.
  • thecardoc3thecardoc3 Member Posts: 5,850
    I'll be spending my last years in the front of classrooms and as a mobile diagnostics specialist when I'm not out on the road.
  • steverstever Guest Posts: 52,454
    I could see you flying around the country training and solving the "hard" issues.

    Good link, liked the "meltdown" story and the flat rate discussion in there. The grease money one too; bet that happens a lot when kids want to fix up a beater and their mom yells at them to get better grades.
  • thecardoc3thecardoc3 Member Posts: 5,850
    As the cars get more complex, the ability for someone to start learning at home by fixing up a beater becomes more and more unlikely. Then as the link above points out, we have kids that get attracted to tech schools only to find their first jobs now are not beside a master technician learning the trade, they are in a separate building doing the quick-lube which is then just a job blocking their path towards a career.

    There is both good and bad in the "meltdown" story. The significance of 61% of the business now being fleet work will be lost on most people. Think about one of the other threads about the Toyota transmission problem and the fact that the dealer the O.P. uses will only replace the unit instead of repair it. Fleet work won't support a shop and techs that can repair major assemblies. What's worse is fleets usually won't keep vehicles long enough for the techs to gain the kinds of technical skills that lead to being efficient at diagnostics and the more complex repair routines. It can be a good business plan to a point, but has a limited scope and it ends up being limited to chasing the same piece of pie that everyone else is competing for and that usually means price wars where no one eventually wins.
  • steverstever Guest Posts: 52,454
    edited February 2015
    Telematics will save the day. :p

    Meanwhile, how come there's not a Lube & Latte here?
  • thecardoc3thecardoc3 Member Posts: 5,850
    stever said:

    Telematics will save the day. :p

    LOL. Careful what you wish for, when your lease is up the telematics will help them decide how much additional you owe for whatever reasons. Your insurance premiums will change based on your driving habits (and probably not in your best interest). The police won't even have to catch you speeding (running stop signs etc) when your car tattles on you all by itself.
  • steverstever Guest Posts: 52,454
    edited February 2015
    Or I could have a wreck because a tech did a defective brake job.

    But if OnStar called me a mile from the shop saying the hydraulic pressure in my brake lines was low, I could pull over and avoid t-boning the semi at the next intersection.

    Guess which scenario will get on the six o'clock news?
  • thecardoc3thecardoc3 Member Posts: 5,850
    stever said:

    Or I could have a wreck because a tech did a defective brake job.

    But if OnStar called me a mile from the shop saying the hydraulic pressure in my brake lines was low, I could pull over and avoid t-boning the semi at the next intersection.

    Guess which scenario will get on the six o'clock news?

    No guessing required, what is the pressure in the brake system when it is at rest ? (brakes not applied)
    If you want to "assume" that you are referring to a brake system uses a pressurized accumulator for assist (such as hydroboost) why does that not fit your alleged scenario either?

    Besides, aren't brake jobs supposed to be a thing of the past too?

  • Mr_ShiftrightMr_Shiftright Member Posts: 64,481
    Doc Says: "Besides, aren't brake jobs supposed to be a thing of the past too?"

    Not in my driveway. :) And yes, I work cleanly and carefully and safely.

    I don't see how techs can keep up much longer. Things are changing too fast. Not only do you have to learn the new technology, but you have to remember the old.
  • steverstever Guest Posts: 52,454
    edited February 2015
    Plus factory warranties are getting longer so the indy techs won't see a new car until it's six years old.

    @thecardoc3‌, I'm sure you can come up with a better scenario than mine, but if the tech screws up and I have a wreck, it'll make the news, just like the hacker story. If the telematics catch the issue before I drive off the lot, it's a non-story.
  • thecardoc3thecardoc3 Member Posts: 5,850
    Would you expect the tech to follow these instructions? http://www.edmunds.com/how-to/how-to-change-your-brake-pads.html

    FYI. There is no pressure in the brake system at rest. There would be nothing for the telematics to detect until you apply the brakes. The hydroboost systems turn the warning light on when the system falls below 60% normal system pressure. However they usually don't code unless there is insufficient pressure increase in the accumulator after a given amount of pump run time. In the event the system would generate a code you would get your phone call and you wouldn't have a loss of the brakes, you would only have a loss or reduction of assist. So then while you are talking on the phone and approaching the intersection, your going to have to push on the brake pedal with a lot more effort than usual to stop the car.
  • steverstever Guest Posts: 52,454
    edited February 2015
    But I'll know why I'm having to push harder once I actually stop and have a chance to read the message on my phone or on the dashboard screen.

    Meanwhile the shop manager will also be alerted by the app and will be going "oh crap". And they'll calling their law firm or insurance agent while prepping the courtesy tow :D
  • thecardoc3thecardoc3 Member Posts: 5,850
    stever said:

    Meanwhile the shop manager will also be alerted by the app and will be going "oh crap". And they'll calling their law firm or insurance agent while prepping the courtesy tow :D

    Why is it that you don't realize the telematics would exonerate the shop, not condemn them?

  • steverstever Guest Posts: 52,454
    edited February 2015
    If the tech screws up and the brakes (or transmission, whatever they were working on) fail in a mile, then how does that exonerate the shop? Were they playing Angry Birds instead of checking the final diagnostic after putting everything back together?
  • thecardoc3thecardoc3 Member Posts: 5,850
    If you put a fraction of the effort into understanding how cars really work as you do trying to have someone else to blame, you'd be able to answer that question yourself.
  • steverstever Guest Posts: 52,454
    I don't have to understand lift or baggage handling systems when I book a flight - I expect to get in a cigar tube and wind up at my destination for my money.

    I'm not a mechanic so when I pay a tech to fix my car, I expect to move on down the road.

    If the "telematics" can't self-repair my car, the least it can do is alert me to a problem. Basically it's just going to be an extension of existing gauges and idiot lights, but with some coding behind it.
  • benjaminhbenjaminh Member Posts: 6,609
    edited February 2015

    ....And if you are an owner of a new car, you probably want to bail out of it right after the warranty, if it's loaded up with all the conceivable gadgetry.

    I can foresee the day when "out of warranty" will have the same impact financially as "salvage title".

    I currently own a 2008 Accord EXL navi with manual trans bought new more than 7 years ago. Got the HondaCare extended warranty for c. $1000, which has coverage until 8 years or 100k. Since I'm now 72k miles, clearly I'm going to hit the years before the mileage. I've been diligent about maintenance, and it's been reliable so far, but it's kept outside in the heat and cold of Kentucky weather. Over the last few years I've replaced the tires, battery, and brake pads.

    I'm trying to decide whether to follow this advice and trade this car in when my warranty expires at the end of December. Probably the car has a lot of life left in it, but on the other hand there's a lot that can go wrong that would add up quickly once I'm out of warranty. Would also enjoy something new, even though I still really like the car.

    My question seems somewhat answered by the above from Shiftright, but does anyone have any additional thoughts?

    Trade in value for my car is probably about $10k or so now. Given my positive experiences with three Hondas, I'm almost certainly going to go with Honda or Acura again. The least expensive route would be to get a base Accord LX, which already has a lot of the stuff on my top of the line from 7 years ago—bluetooth, dual zone climate, alloy wheels, etc. Could probably get one of those for c. 20k flat, or with TTL 22k. With my trade in that would mean a new car with many years of life for just 12k out of pocket. But I'm also tempted by a loaded Accord, or maybe even an Acura ILX or TLX....
    2018 Acura TLX 2.4 Tech 4WS (mine), 2024 Subaru Outback (wife's), 2018 Honda CR-V EX (offspring)
  • thecardoc3thecardoc3 Member Posts: 5,850
    stever said:

    I'm not a mechanic so when I pay a tech to fix my car,

    If the "telematics" can't self-repair my car, the least it can do is alert me to a problem. Basically it's just going to be an extension of existing gauges and idiot lights, but with some coding behind it.

    In a perfect world people would make sure that they really know something about the subject before they present themselves as an expert and attempt to give others advice on it. By "knowing something" that means have a legitimate working knowledge of the system, not just a minimal awareness of it. While it may have appeared to you to use a reference of static brake pressure (which is negligible since the brake ports in the master cylinder are open when the brakes are released) to have the telematics generate some kind of a notification if there was a pressure issue instead of generating a logical debate point you proved that you have no working knowledge of the system. Then from that flawed assumption you tried to add more to it again without any real training and experience from working with robotics and the result was you only got further from a workable theory.

    Do you want an example of what computer diagnostics and the limits of telematics can really do in cars over the last decade? You have great examples in every thread about problems that are described in threads like this one.
    http://forums.edmunds.com/discussion/14979/chevrolet/traverse/chevy-traverse-stabilitrak-traction-control-problems#latest and this one http://forums.edmunds.com/discussion/13406/chevrolet/impala/chevy-impala-reduced-engine-power-message#latest Now will they be better in the future? Well one would expect that to be the case but how far in the future are we really talking? Many of those cars have OnStar and those threads do a good job of proving that isn't enough. Besides there is always going to be one problem that no computer self diagnostic system can overcome and that is a loss of communication between the modules in the car. The system diagnostics can be very helpful and give some direction provided at least some modules will communicate on the data bus, but they will be no help at all if the bus is completely down and now it will be 100% on the skills and knowledge of the technician who without a real culture change inside the trade and support on the outside you have no reason to believe you will be able to find any.

  • steverstever Guest Posts: 52,454
    edited February 2015
    > loss of communication between the modules in the car.

    I think redundancy on that level will be cheap and easy to implement. And I still think self repair will happen too. For your busted bus, think self replication. (preposterousuniverse.com)
  • benjaminhbenjaminh Member Posts: 6,609
    Wow. That stabilitrak problem is a nightmare beyond belief....wtf.
    2018 Acura TLX 2.4 Tech 4WS (mine), 2024 Subaru Outback (wife's), 2018 Honda CR-V EX (offspring)
  • thecardoc3thecardoc3 Member Posts: 5,850
    benjaminh said:

    Wow. That stabilitrak problem is a nightmare beyond belief....wtf.

    LOL. When you consider how fast the computer can decide that there is a circuit failure and therefore goes into a limited strategy (safety) mode there really isn't any other plausible result. Remember the push to have the systems smart enough to prevent accidental unintended acceleration? That's what is happening, instead of a runaway you get a limp in if any problem is detected. BTW detection strategies vary between manufacturers and engine platforms. Some faults are detected and reacted to in as little as 5ms, and others will allow some two seconds before limp in is commanded.
  • imidazol97imidazol97 Member Posts: 27,691

    Remember the push to have the systems smart enough to prevent accidental unintended acceleration? That's what is happening, instead of a runaway you get a limp in if any problem is detected.

    From your statement, it sounds like you believe that runaway acceleration is (was) real. Many people dismissed it as customer caused. Was runaway acceleration a real problem?

    2014 Malibu 2LT, 2015 Cruze 2LT,

  • thecardoc3thecardoc3 Member Posts: 5,850
    Tin Whiskers. http://en.wikipedia.org/wiki/Whisker_(metallurgy)

    The majority of the reports for unintended acceleration were/are driver error, misapplication of the pedals. A small number were in fact floor mat issues and that was something that wasn't new. We have found the occasions of pedal obstruction for as long as I can recall. From there it has been proven that a lot of the transient failures that we see in sensors, computer modules, and in some actuators today beyond the normal wear and tear or wiring issues are the result of the growth of tin whiskers.

    What can make the diagnostics difficult if not impossible is even with the very small currents that most sensors operate under a whisker that grows and causes a connection will usually "fuse open" causing an non-repeatable failure. Meanwhile the length of time that the circuit was connected by the whisker can in fact be long enough to trigger a system response such as a limp in mode and yet still fall short of the criteria required to generate a trouble code. Then again just like so many of those posts in those threads a failure can occur and generate a code but that only says what test failed at that moment in time and not what actually happened sufficiently to guide someone through a repair. Part of the balancing act that engineers have to overcome is that they cannot have the system code for every little voltage drop or spike, doing that would cause nightmarish numbers of false trouble codes with no troubles found. Yet they cannot allow the circuit to be out of range for an extended period of time without risking other unintended results.

    A computer cannot do anything more than; Measure the voltage on a given circuit and compare that to limits written into the software, AND, In some cases the computer can measure the current that is flowing into it or out of it on a given circuit and do the same comparison to the limits for that circuit as written into the software, AND. The engineers can also write programs into the software to allow other sensor inputs to be used as rationality or performance checks against a given circuit (system) but that is the limits of what can be done. The tests that the computer runs result in a trouble code when a test fails and it is a technicians job to understand exactly how the computer tests that circuit and perform the same tests that the computer does in order to prove why the computer made the decision that it did if possible. It's important to understand that the computer cannot circuit test beyond its connector and in a lot of cases the actual testing point could be well inside of the module behind the connector. That being said, tin whisker growth inside the computer module especially if random can be one of the most difficult things to prove.
  • benjaminhbenjaminh Member Posts: 6,609
    edited February 2015
    Somehow I'd never heard of tin whiskers before your post. Thanks for the education. Seems like a reason to consider trading in my 2008 Accord sooner rather than later. Even with mitigation, I assume these problems tend to get significantly worse as the years accumulate.
    2018 Acura TLX 2.4 Tech 4WS (mine), 2024 Subaru Outback (wife's), 2018 Honda CR-V EX (offspring)
  • Mr_ShiftrightMr_Shiftright Member Posts: 64,481
    Accords are pretty good cars and yours isn't loaded up with the vast array of gadgetry on 2015 cars, so I'd be inclined to tell you to stick with it until maybe 125K or so, and then evaluate how it's been doing by looking over your maintenance and repair receipts. As a car ages it gets needier. Things like struts, alternator, power steering pump, AC compressor---all those things can and do fail around 80,000 miles on up and can't be considered a "defect". It's just normal old age. Your Accord shouldn't be too expensive to keep going, presuming there are no catastrophic failures.
    benjaminh said:

    Somehow I'd never heard of tin whiskers before your post. Thanks for the education. Seems like a reason to consider trading in my 2008 Accord sooner rather than later. Even with mitigation, I assume these problems tend to get significantly worse as the years accumulate.

  • steverstever Guest Posts: 52,454
    edited February 2015
    Tin whiskers has been a pet theory of mine for a while, but I thought the NASA study dismissed it as a cause of SUA.

    Here's one example of a way to "self repair" a tin whisker issue. Zap it! (softsolder.com)
  • Mr_ShiftrightMr_Shiftright Member Posts: 64,481
    edited February 2015
    No, because the technician is a professional who has to worry about liabilities and comebacks. He would not use methods this rudimentary, but in a pinch for someone who is handy and careful, why not? I generally don't like to advise people on brake work unless I can watch them do it, but hey, if you lost your job and $400 is needed for other things, give it a shot.

    Would you expect the tech to follow these instructions? http://www.edmunds.com/how-to/how-to-change-your-brake-pads.html

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