vs stalling when hot

[ausiejon]

hi all,I am just new to the commodore forum and am hoping some one may be able to help me. my vs stalls at low speed when hot.also when in park it surges and stalls . i have had it at the mechanics for three days and spent a bucketload on it . new crank angle sensor new oxy sensors , fuel filter,new computer and most other bits checked. i have been through most of the threads but cant seem to find the wright answers and would be most grateful for any sugestions

[VS_Pete_1]

New CAS needed

[ausiejon]

Hi pete thanks for your response..it has a new crank angle sensor its 6 hours old..must be something else..

[VS_Pete_1]

Sorry missed that.

[EDGE3]

Even though you have had other bits checked,I would be replacing the plugs,leads and coils.The coils might be stuffed.The problem with the VS is that it has the idle set to factory specs and it cant be adjusted so you have to search and probe around to find what the problem is.Is it sluggish when your driving it,if so its the coils.

[VS_Pete_1]

Did u keep the old computer???
And why was it replaced??

[ausiejon]

thanks again pete, yes kept the old computer,my mechanic had someone do a scan on it and he said i was more than likley the computer, so he changed it. through this forum i lernt how to scan the computer and it comes with codes 44 & 64 which are the oxy sensors but they are new ones replaced yesterday..

[ausiejon]

hi edge, thank you for your reply, no its not slugish when you are driving.when its cold it works fine takes about 5ks to worm up then when you slow down at roundabouts etc it just cuts out and when you stop and put it in park it surges and stalls..

[VS_Pete_1]

knock sensors mybe?????????????

Try the old computer reset error codes.

[ausiejon]

Thanks pete, do i disconect battery and reconect to reset the codes ???

[VS_Pete_1]

Yes.
But first do you have a standard head unit.
If you have you got the code 4 the head unit?
As u will lost your radio and it needs to be reset also.

[ausiejon]

pete i have the radio code.i am not sure what you mean by head unit. its just a standard v6 3.8. does it matter if i dont erase the codes? it wont effect its operation will it?

[VS_Pete_1]

Head unit = radio.
Do you have anybody in the family/mates that knows abit about cars as I think that the mechanics are getting money out of you.
I don`t see why the computer needed to be changed from what you have said.
O2 sensors do fail and need to be replaced.

[ausiejon]

thanks pete ,guess i am not up with the jargon..I know a bit about cars but am not a auto lec. as i said the oxy sensors are new. installed yesterday.

[Brett_jjj]

pete i have the radio code.i am not sure what you mean by head unit. its just a standard v6 3.8. does it matter if i dont erase the codes? it wont effect its operation will it?

Its best to reset the ECU by removing the negative battery terminal for a minute or two..this will clear the old error codes that the faulty 02 sensors set..

[Chappo_1]

Hi Mate, some months ago my car was stalling when I went from park to reverse, and from park into drive, when it was hot. It was OK when I first started it, but would play up when it warmed up.

This was all it would do, it would not do what yours is doing, it wasn’t cutting out while driving and surging when put into park.

What fixed mine was giving the throttle body a good clean out. I had to take it off to clean it properly. I had to dig a heap of crud out from the small passages. I used a small screw driver, mower fuel as degreaser, and blew it out with compressed air. I made sure not to get the Throttle Position Sensor and the IAC valve wet. (IAC stands for something Air Control).

This may not be your problem, but it won’t hurt to clean it out. Maybe give your Mass Air Flow sensor a clean while you are about it. Look here for info on this. Clean your MAF

Cheers, Darren.

[ausiejon]

thank you brett will do, i will take it back to the mechanic on monday and hopefully resolve the problem..thanks again

[ausiejon]

hi darren thanks for that info..much appreciated i think the only thing that has not been checked is the MAF..

[Chappo_1]

Well I doubt if a dirty MAF would cause the dramas you are having, I just suggested to do this while the TB was geing cleaned. You have to make sure the passages in the TB are clean, just giving it a wipe out won't do. That's what I found out. I had to take it off and give it right proper clean out.

[hako]

Have you checked the fuel pressure regulator - remove the vacuum line to it and check for fuel in the line which indicates a faulty reg.

[ausiejon]

thank you hako, no i havent done that, i will check that in the morning, i am getting very distressed about the whole thing and thinking about burning it..except its not insured

[justbad4you]

,I would be replacing the plugs,leads as edge3 saidt

Even though you have had other bits checked,I would be replacing the plugs,leads and coils.The coils might be stuffed.The problem with the VS is that it has the idle set to factory specs and it cant be adjusted so you have to search and probe around to find what the problem is.Is it sluggish when your driving it,if so its the coils.

[ausiejon]

thank you for that justbad..yesterday I replaced the IAC unit or the mechanic did.took it for a 50k drive not a single problem.no codes in the computer every thing perfect left it for about 2 hours the prob came back....

[ausiejon]

Hi all again, bought another iac unit today new from bursons.didnt make any difference , i am now going to change the tps sensor,my mechanic says that is not the problem,but i wonder if what he said is wright.i adjusted the ideling on the tps unit and it seemed to improve it although it returned to normal after a few different stop start processes do you think this could mean that it has failed.would appreciate any input. regards john..

[ausiejon]

bought a new tps today made no difference.changed the c.a.s,e.c.u,t.p.s i.a.c m.a,f