vt doesnt stay in top gear

[bouncerkmf]

i've got a vt executive v6 auto with some sort of electrical probs,when its cold it is good but as soon as it gets to normal temp out the road it kicks back to 3rd and wont change back up into 4th.now ive changed the gearbox because i was told it was the clutches but even with new box in it the problem is still there(since then i sold the old trans and old mate reckons its a beauty)(also tried another pcm,coil packs,alternator,battery,battery terminals,wriggled some wires,new plugs and leads..its driving me crazy!.it seems to just go into limp mode.sometimes it goes good and sometimes it goes like a slug on valium,but always kicks back to 3rd out the road (at 100kms).it all started when i disconnected the battery to try to reset the airbag light on dash(which turned out was a knackered clock spring).i let it sit for an hour and when i reconnected the battery i drove it out the road and it kicked back to 3rd,and stayed there(if you pull up and take off againthe gears change nice and smooth but it doesnt go into 4th).been doing it ever since.had it to auto electricians and they tell me its still the gearbox but if i disconnect the tps it doesnt kick back(and the gear changes aint real smooth either.hahaha).anyway,if anyone is still reading,what else can i try??could it be a blown or dodgy relay or that bcm?(i dont know a great deal about these newer cars and im ready to take an axe to it.

[burnz]

are you getting any code's??

Just Commodores - For All Your Holden Commodore Needs

[accentstencil]

Maybe it is the TPS since it doesn't kick back when you disconnect it.

[cool vr manual]

hmmm could it have something to do with a faulty fuse maybe??? or wiring loom problem?? seems like ur in a rock in a hard place, hopefully its fixed soon for you :P

[bouncerkmf]

Originally Posted by accentstencil

Maybe it is the TPS since it doesn't kick back when you disconnect it.

it was doing it(kicking back to 3rd) before,but that was another engine(broke the skirt on a piston and replaced the engine with another).put new engine and trans in and identical problem,also replaced the tps and the plug that goes into the tps.cheers

[bouncerkmf]

Originally Posted by burnz

are you getting any code's??

Just Commodores - For All Your Holden Commodore Needs

yes got it checked at a couple of auto electricians and they cleared the codes but didnt solve anything(one was a trans code but after that my mate put the trans in his car and it was great,just like it used to be before i disconnected the battery to try and reset the airbag light on dash).changed engine and trans between trips to the auto electricians and still the same codes.it goes into limp mode when it warms up and doesnt go real good at all.this is when it kicks back to third(when hot)also battery terminals get pretty hot.sometimes it goes allrite and sometimes it just lacks power real bad.all depends what mood its in.cheers

[bouncerkmf]

Originally Posted by VK man

hmmm could it have something to do with a faulty fuse maybe??? or wiring loom problem?? seems like ur in a rock in a hard place, hopefully its fixed soon for you :P

well its been like it for about 5 months now(im on a disability pension and cant afford to take it to anyone that charges $80 an hour,so i just have to do what i can with it.i live out in the country and anywhere that i want to take it to get looked at is 65kms away)but yes i reckon its a wiring problem.when i disconnected the battery to clear the airbag light on the dash,(it was running perfectly up until that point)i reckon its copped a bit of a heart starter when i re-connected the battery somewhere??maybe ive blown something?matey boy at the auto electricians said that the pcm wasnt communicating with some other thing and his $$$$$ worth of test machines couldnt tell him what was going on.anyway i still love holdens but its taken its toll on me.hahahaha.sold a car that was reliable to get a vt,thought it was gonna be the ducks guts but turned out to be duck ****!

[VT_Turner]

How you going mate ive had the exact same problem drove me nuts, im told its the torque converter...but then Holden tell me it needed a new gear box pfftt. Anyway i cant provide help but ive left mine because the reality is it doesnt do any engine damage, you are getting that little bit of exra performace...but your fuel bill will be a little bit higher haha...oddly enough im told that if you have the A/C on it does it. So today im going to go 4 a little cruise with the A/C off and see how she runs. Let you no later 2day.

[bouncerkmf]

Originally Posted by VT_Turner

How you going mate ive had the exact same problem drove me nuts, im told its the torque converter...but then Holden tell me it needed a new gear box pfftt. Anyway i cant provide help but ive left mine because the reality is it doesnt do any engine damage, you are getting that little bit of exra performace...but your fuel bill will be a little bit higher haha...oddly enough im told that if you have the A/C on it does it. So today im going to go 4 a little cruise with the A/C off and see how she runs. Let you no later 2day.

gday mate,good to see that im not the only one thats had this.yes,it seems to play up worse with the a/c on(seems to be struggling for enuf power to things)(dont know about the torque converter theory though).i cant figure out why its gone like this??fine one minute and a dud the next?(just from disconnecting the battery).its like its not letting the power thru to the engine components.its like its got a bad connection or something or a broken wire that when it gets hot does something???something a miss in some box-module-sensor??not like the old e.h where you could just throw a new set of points at it or a coil or plug leads.cheers.richard

[s_ikari2015]

..... so you've replaced both the engine AND the transmission and it is has done it on both sets of engine and tranmissions..... Was it a complete engine swap? Like did you take it all out back to the transmission? Did you use the electrics from the new engine and transmission? What about throttle linkages etc? Did you swap the computer from under the passenger foot well kick panel?

Could you borrow that computer from your friend's car to see if that stops it happening?

[bouncerkmf]

Originally Posted by s_ikari2015

..... so you've replaced both the engine AND the transmission and it is has done it on both sets of engine and tranmissions..... Was it a complete engine swap? Like did you take it all out back to the transmission? Did you use the electrics from the new engine and transmission? What about throttle linkages etc? Did you swap the computer from under the passenger foot well kick panel?

Could you borrow that computer from your friend's car to see if that stops it happening?

yes,ive replaced engine and transmission,ive tried a new pcm(behind the kick panel),but it was doing it with the old engine as well as the replacement one(and replacement trans.)im still using the same wiring harness but i've changed coils,alternator,starter motor,battery(and terminals).its like im only getting half electrical power when the car gets to operating temp.something is shutting it down to limp mode.cheers.

[matt08]

Have you tried replacing the torque converter?

Check out this thread

[bouncerkmf]

Originally Posted by matt08

Have you tried replacing the torque converter?

Check out this thread

yes i replaced the torque converter with engine and trans swap.i cant see how the torque converter can be doing it but im not a mechanic mate.mite just have to bite the bullit and take it to holden?if i disconnect the tps and drive it out the road it wont kick back to 3rd but its pretty savage on the gear changes.hahaha.or when its cold it changes great,but as soon as it warms up,goes straight back to 3rd.cheers.