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Isuzu Trooper



  • bsmart1bsmart1 Posts: 377
    I don't think you need to CHANGE your plugs at that mileage, but you DO need to remove them and put never-sieze on the threads. I changed my 01' plugs at about 45000 miles and they looked fine when I took them out. I put new plugs in (Autolite) and the vehicle didn't want to run right. I ended up putting NEW NGK plugs in, but didn't see any performance or mileage improvements from it. The thing you don't want to do is leave the original plugs in untouched for 100,000 miles. The threads will likely seize and you'll have a MAJOR problem on your hands. :mad:

    The K&N filter is a good idea, but you probably won't see mileage improvement from it alone. It should allow the engine to 'breathe' better and you might notice a small improvment in pep. The reason I went with the K&N was it is a one time replacement. It's cleanable and renewable and it can go 40000 miles between renewal kits, under normal driving conditions. If you keep the vehicle long term it could cost you LESS than replacement paper filters every 15000 miles.

    As far as oil consumption, how much is your Trooper burning between oil changes? If its about a quart, thats quite normal. I wouldn't do anything about it other than the cleaning you eluded to. If you are the original owner your warranty is good for another year or so and 50000 more miles. :)

    Does your 01' make the 'vader sound' mentioned earlier? What kind of mileage are you getting? Is your Trooper 2WD or 4WD with TOD? :blush:
  • coastie007coastie007 Posts: 33
    By the time it's 3000 miles left I have about half of my oil left give or take a little more or less. What kind of oil and filter is recommended? I am not quite sure about the "vader sound" I would say no b/c it sounds like I would have noticed that. I have a 4wd with the TOD, and on a straight highway drive i get about 310 to 330 miles before I am on empty. Is that good mileage compared to others?
  • bsmart1bsmart1 Posts: 377
    Sounds like your losing 1 qt. about every 1200 miles or so. That's not terrible I suppose; my 01' seems to do better than that, losing about 1 qt every 2000 miles. Your mileage is very consistent with other Troopers with the 3.5L engine, i'd say.

    I use 5W-30 Mobil 1 in my Trooper, always have since 1st oil change. I don't know that its that big a deal, but several comments on this forum indicate it should burn off less that standard motor oil. I don't know about that.......I use it because of its proven reputation of protecting engines and it can be left in for longer with concern of 'break down'. I typically change it out at about 5500 or 6000 miles. :D
  • jay21jay21 Posts: 2
    i know it been awhile since you have had this problem and im hoping that you solved it but i just wanted to know basically the same thing you did. Where is it possible to order those clips for the window regulator? just recently i too found out that the clips are not a part of the regulator. Could you help me :cry:
  • jay21jay21 Posts: 2
    I just wanted to know where the clips could be purchased to the window regulator because i too just recently found out that they are not apart of the regulator. Could you help me out?
  • boxtrooperboxtrooper Posts: 843
    My MPG on a long trip where I ran two full tanks back to back with my 2001 3.5L 5 speed manual shift Trooper was 349 miles on 18 gallons followed by 367 miles on 19 gallons. These average to 19.35 MPG. The terrain was over the Appallacian Mountains. I had a bunch of stuff (bulky but probably only 400 lbs. or so) in back and all the seats folded forward. No passengers today. Total travel time was 11 hr. 10 min. (I was stopped for 25 minutes between tankfuls, there were some slow construction areas too) so my average trip speed was 66.6 MPH.
  • sbcookesbcooke Posts: 2,297
    St. Charles is great, if they are still selling Isuzu's. I cannot remember the site, but do an internet search. I don't know about the clips you are discussing, but you should call them up and mention you got their site from the internet.

    Nice mileage. I never got above 18 in my trooper and am happy to break 14 these days.
  • bsmart1bsmart1 Posts: 377
    SB are you saying 14 mpg on the highway?? If so, there is something WRONG. That should be looked into........I forget are you driving a 99'?
  • yngveyngve Posts: 12
    I just switched from SeaFoam to CD2 as well. Prior to the SeaFoam, I was burning about 1.5q per 1000 miles. After the SeaFoam, I was down to about 1q per 1000. After switching to CD2 (and Castrol Syn/Dyno blend 5w30), I'm down to about .5q after 1000 miles. I'm planning on running this for another 1000 miles, then changing oil/filter, switching to Mobil1, and another pint of CD2. As long as I can keep my consumption this low, I'm happy - it's the sudden spikes that I was experiencing before (3q in 1700 miles at one point) that had me thinking about dropping the cash on new rings.
  • superskeetsuperskeet Posts: 14
    I'm sure changing to a better oil doesn't hurt, but I'm still seeing improvement in my oil consumption with the CD2 alone. I'm using Havoline 10w30. I have 2 '99 Troopers, one with 108k miles and the other with 90k miles. Nothing else I tried made a dent in my consumption except for the CD2. I know this is not my first post about this stuff, but with so many people having this problem I feel I have to spread the word. It's a helluva lot cheaper than a ring job!
  • I'm looking at a 2001 Limited currently. VERY nice vehicle. I can't believe all the options. It's got 46450 miles. Had a mechanic friend tell me that it would start using oil by 60k miles - and use a quart a month. Looking online here I'm seeing that several others are using oil. Is that standard for a Trooper? :confuse:

    I totaled a 1996 Toyota T-100, and haven't had any experience w/ an Isuzu product.

    Any info anyone could provide would be greatly appreciated.

    Also, what kind of gas mileage can I expect to get around town/highway?

    I believe that the original window sticker said 16/20...

    edit: Added gas mileage question.
  • cobbocobbo Posts: 34

    Unfortunately, I suspect you're going to find no consistency in the answers you receive....I have a 2001 LTD 4x4 with now over 97,000 has never burned even a quart of oil off between oil changes (which I regularly do every 3k) but it has never gotten the 16/20 gas mileage it was stickered for. I do a blend of city & highway driving on each tank, I'm not the first off the line & the gas mileage has declined over the course of time from a steady 15mpg at the start, to 14mpg around 60k and now I seem to be averaging about 13.5mpg.

    I've often read people on here getting 18+mpg, but I've never seen that in my Troop - but then again, I've never had to add extra oil either....
  • sbcookesbcooke Posts: 2,297
    14.5 too. It is a 1999. I burn little to no oil. I have been having it looked into for 2 years. I don't use the truck for much other than a short commute and 4 wheeling so I don't worry about it too much. Since my 4wd has been on the fritz for the last year, I don't have much use for it anymore.

    I recently had my serpentine belt replaced, I maybe put 5K miles on it last year, so perhaps the belt has been worn and I have been losing efficiency? That is all I can hope for at this point.

    I have added 265/70R16 tires, which could drop my mileage by 1, I have a bull bar, which maybe takes away another 1 mpg. Roof rack, perhaps 1? then I am up to 17.5 mpg.

    I am happy to get 11 around town. I have honestly been thinking about getting a Ford F250 since I would rather get 10 mpg in a truck like that. Right now we have no car payment on it, I commute to work on my bicycle, so if I can get this 4wd problem resolved I will be happy.
  • bluedevilsbluedevils Posts: 2,554
    interesting. I wonder if there is any correlation between the two. Our 98 Troop has always burned oil, but we have gotten fairly decent fuel economy-- easily 18mpg on straight highway driving at 75mph, more like mid 16s to 17 in mixed driving.

    As long as the oil consumption does not reduce the life of the engine, which it does NOT seem to do in the 1998-2002 3.5L Troopers, I would much rather get 2-4mpg better and need to add a $1-2 quart of oil every 1,000 miles or so. From a cost-of-ownership perspective, it's a no-brainer.
  • boxtrooperboxtrooper Posts: 843
    I forgot to mention, the 19.35 MPG is with Yokahama G051 275/70R16 tires and the OME firm suspension coil spings and all four OME shocks. My Trooper rides an inch and a half higher from the OME suspension parts and another inch higher than that from the larger tires. Both the larger tires and the higher distance off the ground make MPG worse. When I purchased this Trooper fully stock it got 21 MPG on the 5 hours drive home at 65 MPH with fewer mountains in the way than the 19.35 MPG trip.
    It does use a little oil, about 1 qt. in 5000 miles. I add a little more than the 5 quarts initially to top off just above the mark on the dip stick this lets me worry less about running low on oil. I don't need to top off between 3000 mile oil changes because the oil level stays in range on the dip stick. I do add oil or at least make sure to check it if I let my oil change interval go above 4000 miles.
  • bsmart1bsmart1 Posts: 377
    I just completed a tank of fuel, doing strictly in town driving over the past week or so. Came in at 14 mpg. :mad:

    I did change to 265 70R16 tires several months back, but it didn't seem to impact fuel mileage any... that surprised me. :confuse:
  • :D Went ahead and purchased the vehicle. :D

    So far, I really love it!!! Comfortable, quiet, smooth.

    46250 on the odometer (typo in the 1st post)... gonna have to get windshield wipers though

    1st fillup was $45 for 20.37 gal. I always keep my mileage, so I'll let y'all know when its time for more gas.


    I'm also working a deal (trading work) for a 91 Trooper (2.8 V6) the shop is presently 'plating the frame' Top, sides & bottom... from the 1st cab mount all the way to the rear end on both sides. Wanting to get it for a work vehicle. The '01 Limited is WAY to nice to work out of...

    the 91 had 58K on the odometer. My question... (and if you can't tell - I don't know jack about vehicles :blush: ) is a frame repair like this a safe alternative to trashing the vehicle? and before someone asks, no, the whole frame isn't gone... some holes... but not broken anywhere (I saw the frame sans body - and it does look strange - the body on the lift beside the frame) The body is in GREAT shape (save a hole in the drivers front fender)

    I appreciate your guys input.
  • hrichterhrichter Posts: 1
    My trooper started using oil at 50,000 miles. Then at 58,000 miles, after adding oil two days earlier, loud tapping noises twenty miles from home. Called dealer. Said to add oil and it would be ok. Wasn't. Engine replaced by Isuzu with a caution to monitor oil changes at 3000 miles religiously. I really like this vehicle!! but now I have another 60,000 on my new engine. All ok so far.
  • boxtrooperboxtrooper Posts: 843
    I have been wondering what is different between me at 19+ MPG and those of you that have posted less than 15 MPG. I use the high octane fuel and fuel injector cleaner once a year. When I have occationally used low octane (87 octane) I notice hesitation and less power than when using higher octane.
    The experiment that I would like you to tray and report back here to the discussion:
    1.) get a "once a year" bottle of fuel injector cleaner, use as directed on the label.
    2.) unhook your battery for 30 minutes or more to reset learned parameters
    3.) reconnect your battery to start learning to use the higher octane
    4.) use only the highest octane gasoline for several tank fulls
    note: try and drive at least 20 minutes each time to make sure its fully warmed up.
    5.) monitor oil use and fuel economy during these changes.
    I expect that the Trooper will have a little more pep and less hesitation because the engine computer will be able to advance the timing without experiencing knocking. The knocking if it is happenning, can also make oil burning worse, so less knocking will cause less oil burning.
    This is a cheap (highest octane is only 10% more expensive than lowest) test that is healthy for your Trooper.
    Enjoy your Trooper.
    Thank You
  • anthonylanthonyl Posts: 9
    I routinely get 18 to 19 mpg on trips, with about 19.2 mpg tops with 2 passengers, luggage, and using the AC. I use fuel injector cleaner about twice a year, and keep tires fully inflated. When towing a 3000 lb camper through flat country, I have averaged 14.5 to 15 mpg driving 60 mph. I use Mobil One in the rear end and engine and grease the driveshaft about every 3K miles. I have yet to change the spark plugs at 54K miles. I never gun the engine or engage in quick starts or stops.
  • Averaged 14.2 for the first tank, around town. :(

    Been very humid here last week, so A/C was constantly on. Living in the mountains of WV probably doesn't help much either. (Plus my 01 has the towing package and auto tranny)

    I'm gonna try to not use A/C at all for the present tank and see if it makes any difference. I'll change the oil this week and switch to Mobile1. 5W-30 I believe I've seen posted.

    I'll try the fuel injection cleaner also. Would a bottle of octane boost be close to the same as filling up w/ 93?
  • boxtrooperboxtrooper Posts: 843
    I think the Fuel Injector Cleaner boosts octane already.
    I would be affraid to use more than one kind of additive at a time, so I'd just do the Fuel Injector Cleaner and not the octane boost. I don't trust additives very well, I read the entire label very carefully and use infrequently.
    I think octane booster is the same as higher octane fuel, but my preference to stay away from additives would make me buy the high octane fuel instead.
  • bsmart1bsmart1 Posts: 377
    Sounds like you got a GOOD Trooper if you're getting the mileage in just city driving, or short trips driving. I've seen worse and heard a lot worse on this board. I bet you won't see any difference when you turn the A/C OFF. I bet you get about 18 mpg on the highway when you make your first trip. Look forward to hearing more about your 'new' Trooper performance. It truly is a bargin these days for the amount of vehicle you get for the money.
    Mind telling what you paid for it??
  • Not at all. I got it for $16k.

    It is a 2001 Trooper Limited. Every option that come on it, plus a few more the original owner just had to have :) 46250 miles. Only thing I've added it a rack for the top - and the dealership paid for 1/2 of that.

    Still have the original window sticker in the glove box. Sticker was just shy of $36k.
  • yngveyngve Posts: 12
    With the patented "flying brick" aerodynamics, the MPG of the trooper seems to be extremely speed dependent. I've managed 20+ MPG driving back roads from Jackson Hole to Salt Lake where my speed was limited to about 60-65. On the other hand, I'm lucky to get 15 MPG going from Vegas to Salt Lake (lots of uphill) on I-15 doing 83 mph. And for the record, my troop's an oil burner (with an auto trans and the towing package).
  • silverghostsilverghost Posts: 154
    Let's compare notes -

    My Trooper is a 2001 LS (the real LS, not the rental fleet type) 2WD Automatic. I still luvvit, btw.

    I routinely get 19-20 hwy mpg with 87 octane fuel, dino 10W30, 34# psi in cold tires, AC blasting, and running 75mph on 300 mile jaunts. I change oil every 3,000, and have never burned the first drop.

    I will NEVER again use ANY bottled F/I cleaner. Last time I did, I baked the cat converters in an Audi (to the tune of $1200!!).

    I"m a firm believer in re-setting the ECM periodically, and have found that doing so improves performance significantly. I've learned from experience that periodic EGR tube cleaning is a very worthwhile investment of time and money, from performance and fuel efficiency perspectives.

    I, too, experimented with 91 octane fuel. I "thought" that it helped performance a smidgen, but no more so than re-setting the ECM. With that in mind, and with premium fuel at $2.45 or so, 87 oct. does me just fine.

  • I might be wrong - but I'd be willing to bet that the mileage difference is 2WD vs. 4WD.

    Just a speculation...

  • 95trooper95trooper Posts: 4
    I recently had my spark plugs, wires, and one coil pack on my 95 replaced because of poor performance and misfiring in 2 of the cylinders. Its running great again, but, all of a sudden, almost immediately after this repair, my starter has started to do some weird things. It will crank and then grind like I was trying to start it when its already running. I should say this is not happening every time. Could the starter be bad or am I just not used to it firing up right away? Lets see, details are its a 95 with 136k miles on it, 3.2L, auto, 4wd, tow pack. It also seems to chew up the Bridgestone Duelers pretty fast but its done that as long as I've had it which is 7 years.
  • silverghostsilverghost Posts: 154
    2wd does get better mileage than 4wd, but BoxTrooper didn't say in his post (the one I replied to) which setup he had. I believe he has a 5-speed. If so, and if he also has 4wd, the tranny probably explains why his mileage and mine are roughly the same.
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