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Isuzu Trooper



  • My mileage sucks, but that's because I drive 6 miles back and forth to work, and about 4 miles back and forth to Home Depot. In Suburban D.C. you have to stop and go a lot because the moron in the Lexus in front of you (a lawyer/lobbyist probably) is too busy talking on the cell phone to start and stop smoothly.

    Seriously, short stop-and-go trips are much worse than short non-stop-and-go trips, which are worse than long non-stop-and-go trips. If you drive hard, everything is worse.

    I expect about 12-13 MPG with my commute. On the highway, at 65, I expect about 22 MPG. On the other hand, the mileage is only a little better in my wife's Sienna in this kind of driving. It's rated 22/26, I think. Even my old 4 cyl Ford Ranger only got about 17 in these conditions, but over 30 on the highway.
  • breakorbreakor Posts: 398
    Some guy named Paisan. Here is the quote -"Don't forget the '99 is the heaviest and biggest engine of them." This was in message #5287 in response to someone having a 99 and an 01 among other vehicles.

    This is how rumors get started by something being slightly mistyped and/or taken out of context.
  • breakorbreakor Posts: 398
    By my count the grand total of ALL "verified" #1 cylinder problems to-date is now 2 including tek182's.

    Moody's and freerlove's problems were admittedly caused by having little or no oil in the engine. It could still be that the 2 reported #1 cylinder problems have the same cause. What about it tek182, what did your dealer tell you caused the #1 bearing problem? Did any of the other bearings, or other engine areas for that matter, show unusual wear? Was your engine losing oil and did you properly refill it in a timely manner? Or were you like freerlove and never checked going 6000+ miles between oil changes?

    The conclusion I am still left with is that a high percentage of these engines (Paisan's 25% figure sounds about right to me) use oil. If you don't watch this and replace the lost oil you will be needing a new engine.

    Just my $.02.
  • schweikbschweikb Posts: 111
    KYB shocks do not have poly bushings. I put GasAdjusts on my 98 Trooper about 2 years ago (they were rubber); just replaced them with MonoMax's (they are rubber). Just giving information, not intending to be critical.
    Also, with my 98 Trooper S automatic (with 96,000 miles on it - bought new) I have been recording every drop of gas I put in it since day one. Overall average is 17.1 mpg with the 3.5 v-6. During the course of the winter I notice a drop in overall mpg (went down to 16.8 by last April) then it picks up again as the warmer weather comes and now stands at the 17.1. My Excel spreadsheet shows overall lifetime mpg and "since last fill-up" mpg. The latter ocassionally drops to 11 mpg and sometimes hits 22mpg depending on when and what I'm doing.
  • Thanks for straightening me out: I was probably mixing the Bilstein and KYB. Do you like the MonoMax's?

    Your mileage is better than mine by a long shot. Clearly, though, if you've put 96K on it - I put 8K on mine in a year - you drive a lot more than I do. Mostly highway?
  • Would you share your excel spreadsheet since I just bought my Trooper and was thinking of tracking the mileage for a while? I could fiddle with Excel, but why re-invent the wheel...

    If you care to, please email to

  • schweikbschweikb Posts: 111
    The Mono Max is a tremendous improvement over the KYB Gas Adjust and light years beyond the stock Trooper Tokico shocks. The Gas Adjusts were good for handling on smooth roads but were incredibly stiff on bumps, potholes washboard, etc. The Trooper leaned less into a corner than with the stock shocks, but if you hit anything rough halfway through the turn the vehicle would move sideways. The Mono Max's are much softer riding, absorb almost anything in terms of rough road surface, but at the same time limit the lean or roll even more. I love them!
    Yes, my driving is a lot highway. Mon - Fri I have a suburban highway roundtrip of 25 miles and virtually every weekend I have been putting on 300 miles going up to my weekend house (hence the high odometer mileage in just over 4 years). I recently purchased a 2002 Altima 2.5 S automatic which is relieving the Trooper during the warmer months. But come the snow season the Trooper will probably be back in action quite a bit.

    To tle_port:
    I will be happy to send you the spreadsheet I have been using on the Trooper, but cannot do that until next Tuesday since I'll be away upstate until then (I,m at work now).
  • tek182tek182 Posts: 6
    The dealer said the problem was probably due to low oil. The problem with that is I just had the oil changed at the dealership where I live (yes, I did check the oil afterwards and before starting my trip). This was done approx 500mi. before any major problems. As a matter of fact, I had to have all the maintenance records faxed to the dealer for the Isuzu rep. The longest I ever went between oil changes was about 4500mi. and I checked the oil regularly. I still don't see any reason why an engine this young (58000mi) should burn that much oil. When I get the new one back, I am going to run Mobil 1 from the beginning and see if that helps. Paison said it reduced oil consumption in his case and I had heard about the Troopers boiling off oil before. Thanks for the info.
  • breakorbreakor Posts: 398
    Thanks for the response and sorry for all your hassles.

    It sounds like you did all you could to properly maintain your vehicle. (Note: I had since reviewed the old posts and found that you started having the oil usage problem at 50k mis. Thus, you no doubt had good reason to be deligently checking for the proper level.) Something must have changed within the last 500mis. causing a dramatic decrease in the oil level and the damaged engine.

    Be sure to continue to save all your maintenace records. While I certainly hope you don't have any future problems, it does make me wonder if the dealer really knows what he is doing (screwed up engine block work, you take it in with engine noises they find a rattling muffler shield and shortly thereafter the engine dies). In fact, once he is done it might not be a bad idea to have another dealer check the work. For example, I might trot it right over to another dealer or at least pay another one to do the next few oil changes and tell them to look for any engine problems while they are at it.

    Good luck.
  • schweikbschweikb Posts: 111
    I will be happy to send you the spreadsheet I have been using on the Trooper, but cannot do that until next Tuesday since I'll be away upstate until then (I,m at work now).
  • I look forward to receiving it.

    I have had mine for 2 weeks today and it looks like I am at around 16MPG with mostly city driving.

    Is everyone using regular unleaded at 87 octane?

    Anyone getting better results with higher?

  • beer47beer47 Posts: 185
    After a year running 87, I started getting a knock going up hills and I switched to 89 and things have been OK since then. Different horses for different courses. Some may be able to run 87 from stem to stern w/o problems. I had to change and so far so good. Perhaps from 100k to 200k I'll have to run 91/93 to keep running smooth. I'll cross that bridge when I get to it. 89 for for now, no problems.
  • paisanpaisan Posts: 21,181
    The person I was replying to had a '99, '95 and '89. The '95 while the same body was lighter than the newer models.

    Sorry for the confusion, if there was an '01 in there I was wrong. '98-'02 should be roughly the same weight.

  • bsmart1bsmart1 Posts: 377
    I'd like to get a copy of the Xcel spreadsheet as well. I'm going to do some 'tinkering' with my 99' and see what happens to the mpg. This spreadsheet will be a good tool to keep track of things.

    Sounds like Trooper users are getting a wide range of mpg numbers. I don't consider myself to be a 'leadfoot' by any means, and I am disappointed in my mileage. I've driven this Trooper much like all other Troopers I've had, it just isn't matching up mpg-wise. It's really a downer to get mileage that you would expect in a Suburban, or Yukon, or Full size truck. Guess ISUZU just missed something in quality control when some engines use oil as much as theirs do, and others seem to use no oil. Oh well, you have to give it to em' on overall durability for the long haul. They do seem to be dependable.
  • beer47beer47 Posts: 185
    I bet the power to weight ratio for a trooper is somewhat similar to a Tahoe. My tahoe got alomost exactly the same MPG as my trooper. I too thought that the trooper would have better MPG than the tahoe, seeing how it is quite a bit lighter in weight. But when you consider the smaller engine it could be similar. I bet one of the engineering types on this board could figure this out exactly quicker than Sherman took Atlanta. Cheers to all.
  • boxtrooperboxtrooper Posts: 843
    How many people would run stock size street tires of the lightest available type to get more MPG?

    I think it would be excellent for the Trooper to get 31 MPG like the diesel version does in the UK, but USA diesel fuel has too much sulfur to let the Trooper diesel pass emissions here.

    My 1995.5 Trooper has spark plug wires and benefitted a lot from the product especially when driven very hard like towing (9.9 vs 11.2 MPG), but it only helps a tiny bit in MPG in light MPG conscious driving.

    There was once a rumor that the Suburban would get the Duramax diesel. That would be one to take a good look at if you have a need for a lot of seats.

    I have the K&N drop in replacement air filter which made a very noticeable difference compared to the dirty Isuzu filter it replaced. I bought, installed, and removed a Calmini cone filter that replaces the normal airbox. I removed it without even driving the car because I could see that any particles that might hit the fan would be slamed right into the cone filter. The K&N filter material looks like a well worn tee shirt, and IMHO it would not hold up to fan debris.

    I looked into a replacement exhaust system. Found an outfit in the UK that makes them out of stainless. I asked if the engine performance increase would be noticeable, he said the Isuzu exhaust is already optimized, that his new system might be better, but only very slightly. It was expensive and there would also be a large shipping charge.

    The Australian outback racers claim that intake and exhaust are the biggest places for improvement. I think they may be right, but you have to be willing to be as loud as a pack of Harley motorcycles to get the improvment.
  • wildbucwildbuc Posts: 88
    Has anyone tried this?
  • In your note, you say "The K&N filter material looks like a well worn tee shirt, and IMHO it would not hold up to fan debris." I think, at this point in the note, you mean the Calmini filter, not the K&N filter. Am I right?
  • What's the procedure, again, for re-setting the ECU? I seem to recall that you just disconnect the battery cable (neg or pos??) overnight. But, wasn't there something about turning the ignition key on for about 5 mins before starting?

    Sorry for not remembering - I must have killed a few too many brain cells last night.

    Thanks, Dave
  • savvas_esavvas_e Posts: 347
    Boxtrooper .... The exhaust upgrade done by Garland Racing has only a mild noise increase. It's actually not that bad unless you drive it hard! Here's the URL ...

    The upgrade is worth about $1800AUS fitted. This includes a completely new exhaust and a modified air box. The extent of modifications done to the air box depend on the trucks's usage. If you are staying on hardtop with little dust, then the most modifications are done and the greatest gains are achieved.

    Also the standard exhaust is far from optimised. I've experienced the results of the upgrade and you can't achieve those increases in power and torque by simply changing the breathing of the motor, if the standard setup is already optimal.

    The only problem is, more performance....more throttle....more fuel! You can get consumption savings with this upgrade if you drive easily. But face it, you've just installed more horses, the temptation will be to use them!

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