89 vn 3.8 ltr v6 problems

[89 vn executive dude]

hey guys and girls. i have recently brought an 89 vn commodore 3.8 ltr v6. of which i used to own a yr ago. back be fore i sold it it was fine. have just brought it back and there is a problem with the engine. it is reving higher than i remember bout 1500 rpm when idling. and we i put it into the drive gear it starts shudering and shaking and wanting to stall. i am new ish to to commodore and dont know much bout engine problems, if any one can offer possible solutions it will be really apreciated cheers

[Morton]

High idle:
Remove throttle body, check and clean Idle Air Controller (also known as the idle speed control valve). Check and clean throttle position sensor.

Stall under load:
Remove and check spark plugs, replace if necessary. Otherwise, check other ignition systems like coils and leads.

Rest the ECU:
Disconnect battery for two minutes, reconnect and start car. Hold in park at high idle (2500rpm) for 30sec and release. Check new idle.

[89 vn executive dude]

hey cheers for that dude, um the car has new spark plugs and leads but i shall check the coil.and i shall look at the air controler tomoro many thanks man.

[hi_ryder]

High idle:
Remove throttle body, check and clean Idle Air Controller (also known as the idle speed control valve). Check and clean throttle position sensor.

Stall under load:
Remove and check spark plugs, replace if necessary. Otherwise, check other ignition systems like coils and leads.

Rest the ECU:
Disconnect battery for two minutes, reconnect and start car. Hold in park at high idle (2500rpm) for 30sec and release. Check new idle.

never seen you in here... must have just bought a vn vp... lol

[VNVacationer]

Also check all the vacuum lines as a leak will make the engine idle faster than it should

[bcw61]

High idle:
Hold in park at high idle (2500rpm) for 30sec and release. Check new idle.

If you are referring to resetting the Idle Air Control Valve (IAC), after resetting the ECU (by removing the 'Engine" fuse for at least 10 secs), then (if memory serves me correctly), you need to start the engine and take the revs over 3000 rpm for 10 secs. During this time, the ECU will drive the IAC Stepper Motor to fully closed and then back out pre-determined steps - this will allow the ECU to reset the IAC Stepper Motor from the fully closed position, into the correct position.

Been a while since I have done this on my old VN, so the memory could be a tad rusty.

[89 vn executive dude]

cheers mate and yeah i own the vn bout a year ago but then sold as i got me and the car nto trouble and now havre just brought it back and it has the engine problems now. i will try not to sweat it haha i just really wanna get the girl running well again

[89vn_Jai]

You could try inspecting the vacuum hose that goes to the map sensor. It could be broken or perished. Or could be the actual map sensor faulty. The sensor is located on the firewall an the hose goes from it to the back of the inlet manifold