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  • Gutless KZ-TE

    My 2003 GX seems more gutless than this engine usually is. Climbing a steep hill, I had to go back to 1st! Not towing anything either. And leaving one of our favourite camp sites (Ferndale Park near Dungog) towing our Camping Trailer, I needed to stop and put it into low range 1st, because the vehicle died in the you-know-what in 1st gear. Admittedly, I replaced the 225 sized tyre rims for the 265 sized rims and am now running BFG TAs, but that shouldn't've made that much of a difference! On another site I was advised to rechip the vehicle, replace the exhaust with a 3" one and some turbo boost thingy for the turbo. Another had the realistic notion of checking the MAP filter. I finally found it (held by a clip to the side of the intercooler) and firstly tried blowing through it. Air will flow freely blowing through the top (white) but is hard to suck. Blowing through the bottom (tan) is hard but possible, but easy to suck through. So the air is flowing freely from top to bottom, but not the opposite. I don't know if it's a one way affair with a check valve or it's blocked for the other way. Any ideas? Might not even be the MAP sensor after all. I was hoping it was. Would've been the cheaper fix!

  • #2
    A bit more information would be helpful.

    Kms done
    Service routine etc etc.

    Is it blowing any smoke?
    What condition are your injectors and fuel pump in?
    Is you air filter element clean?
    Has the timing belt been changed recently?
    2008 Diesel Prado with extra stuff added. I drive it on the road and other places too.

    Comment


    • #3
      Hi. You may find that its down to the tyre size that is causing the issues rather than anything wrong with your engine.

      The 1kzte is an adequate performer standard. If you dont think so take an early 2.8 hilux for a drive and see the difference.

      From personal experience our 120gxl was fitted with 265/65/17s and was adequate. We fitted new 265/70/17's and it knocked the power a bit so that the auto was slightly out of whack with the speed and would hunt once it hit 4th. Fitted a safari chip and this brought it back to about how it was before the tyre change.

      A change from 265/65 to 265/70 is only a 3% change to the gearing.

      A change from 225/70 to 265/70 (I imagine you have the 70series being bfg's) and you have changed it by almost 7%, double the normal change.

      Chips and exhausts are definitely great but I would suggest that yours is just unable to deal with the gearing change particularly as I thought that the GX had 3.9 ratio diffs whereas the GXLs have 4.1's. (a more knowledgable person may correct this)

      To give you an example of the difference small dif ratios make when we used to race mk 2 escorts a simple change from 3.9 to 4.1 made a big difference in gear changes. A change to a 4.6 transformed the vehicle. A 4.9 and it was a short shifting monster!

      So I think what you have is caused by the tyres. Can you get some std 225 tyres and rims to refit and test. If it were me I would beg borrow steal some, then put it on a dyno and see what its putting out. You never know the 3"may have knocked some performance off as well.

      Good luck
      2009 120 V6 Auto. 265/70/17 Goodyear Silent Armours. Bilsteins and Kings Springs.

      Comment


      • #4
        I have a similar GX model manual diesel which has also had the tyre/wheels upsized to 265x65 ATs,and have found no noticable difference,i think a GXhas the same gear /diff ratios as a GXL. mine now has 160kms and still goes well,and as someone here[ Stevem I think] likes to use hawkesbury river F3 hills as a yard stick, i can still pull up both sides in 5th gear and maintain the 110km speed. That being said if i had a spare $ i would consider a chip an exhaust upgrade.Where i live in the mountains i live at the top of one of the steepests roads in the district and pull up here include towing trailers no issue in 3rd or 2nd. i would suggest you have a look around your fuel delivery system ,pumps ,filters,injectors etc and also look at the butterfly flap thingy under intercooler that has a good thread here somewhere regarding the cleaning of.Only recently daughters B/F had issues with a qd32 navara engine not running welland the trouble was track down to a small gauze filter at the injector pump. I am averaging around 11ltr/100km .
        New 2015 150s GX 5 seater with floor mats, towbar and a big wish list
        Previously a 2004 120s 1KZ GX silver manual with stuff
        before that a 1996 RV6 90S with lots of gear

        Comment


        • #5
          I don't think this come down to tire size. I have the GXL 1kz in Manual. It is unchipped, standard exhaust etc, and is running 275/65. On a real steep hill, in the country, while towing, I might have to knock it back to fourth to keep the speed up around the 70/80kmh. Around town, I don't have any problems with hills etc. If i'm going from a complete stand still with the camper on, up my very steep drive way, I do chuck it in low gear because it is so much easier on the car. But, if not from stand still, you should never have to go back to 1-hi going up hill, and if on flat terrain, you shouldn't really need to go into low gear to get moving with the camper on.

          It could be a clutch problem. Smell any burning at all? Otherwise, maybe an injector issue.
          Diesel Prado with various things...

          Comment


          • #6
            Originally posted by iantz View Post
            I don't think this come down to tire size. I have the GXL 1kz in Manual. It is unchipped, standard exhaust etc, and is running 275/65. On a real steep hill, in the country, while towing, I might have to knock it back to fourth to keep the speed up around the 70/80kmh. .
            Your tyre change is only 1.6% higher. Drogues is more than 4 times yours which is a big difference.
            2009 120 V6 Auto. 265/70/17 Goodyear Silent Armours. Bilsteins and Kings Springs.

            Comment


            • #7
              Originally posted by tassie tiger View Post
              Your tyre change is only 1.6% higher. Drogues is more than 4 times yours which is a big difference.
              The tyre upsize unless it is maybe a 265x70 as opposed to a 265x65 [776mmdia]should not make any if little difference.The original gx tyre was a 225x70s [748mmdia] and the gx has the same ratios,and also includes a dual tyre placard to legalise the tyre change,so cannot see where the massive power drop can be blamed on this.It is acknowledged that one may experience a slight performance drop but not to the extent as outlined in the original post.
              As stated in my post above i have a 1KZ GX prado which is manual,it was originally fitted with the 225x70 17 tyres on 17x6 rims but is now running 17x7 gxl rims with 265x65 AT tyres, a swap that many of us on this forum have done.
              I do think the issues of a gutless 1KZ TE, would be tracked down to an issue with the fuel delivery system or maybe a clutch issue
              New 2015 150s GX 5 seater with floor mats, towbar and a big wish list
              Previously a 2004 120s 1KZ GX silver manual with stuff
              before that a 1996 RV6 90S with lots of gear

              Comment


              • #8
                My thinking was exactly along the lines of RAGS. The GX can take the GXL rims / tyre sizes no probs. All ratios etc are the same from what I've read. And if you think going up that much in tyre size would have you going from third to first to get up a hill, how the heck do blokes go from standard to 35" etc on the bigger 4wds? The tyre size would have had SOME effect, but certainly not to the extent described. This is just my opinion though....
                Diesel Prado with various things...

                Comment


                • #9
                  Gday drogue7

                  I noticed that you only live @ Lake Haven! (50km's).

                  I live @ umina! I can have a quick squiz and check the obvious things for you and check the turbo boost to rule that out as have a boost gauge if you want!

                  PM me and can arrange to meet-up if you want as it sounds like it "could" be something simple.... Even a collapst muffler is a possibility. (Highly doubt the wheel size).

                  Cheers

                  Comment


                  • #10
                    check all the hoses on the passenger side of the intercooler, i had 1 of them come off on my gx and it was totally gutless, ie i had to go over the gap as freemans water hole in 3 flat to the floor, wouldnt pull any boost, pulled over and popped the bonnet and found the problem, hooked it back up and went as good as gold again, check around that it hasnt got a leak in the egr gasket, mine also failed, but you could actually hear it blowing a bit of boost out of the gasket, this made it a little down on power as well. cheers samo
                    had an 03 gx 120 with some gear now got a 2013 bt 50 GT auto some ARB gear.

                    Comment


                    • #11
                      Originally posted by drogue7 View Post
                      Admittedly, I replaced the 225 sized tyre rims for the 265 sized rims and am now running BFG TAs, but that shouldn't've made that much of a difference!
                      Maybe I am reading the thread wrong but was it going fine BEFORE you changed tyre size?. If the experiences of others that the tyre change doesnt make that much of a difference from the gx to the gxl then I would think that there must be something else wrong and the tyres have exacerbated the issue.

                      I take it you havent changed the exhaust or chipped it yet? If not DONT until you have it running right first.

                      Have you checked the inlet manifold and butterfly for carbon as seen here;

                      http://www.pradopoint.com/showthread...le-body/page14

                      If you have a second vehicle then why not pull the injectors, pull the intercooler, manifold and throttle body and clean them up. Take the injectors to a diesel place and get them tested. Compression test while the injectors are out (wet and dry).

                      Refit, new filters and test. If its still down then time to look at the pump but at least when you take it to the diesel specialist he will know that you have already done some of it and will have the specs for the compression.

                      best of luck!
                      2009 120 V6 Auto. 265/70/17 Goodyear Silent Armours. Bilsteins and Kings Springs.

                      Comment

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