High/Hanging Idle

[ssmith95]

Im headed towards buying a smoke machine. This car has got me totally stumped. I tested two separate IAC valves tonight and both are fully seated in the passage. I used a curved pick to see if the pintle was fully seated and it was.

What is the lowest possible point a vacuum leak could occur, the injector housing gasket?

[ssmith95]

Smoke test was revealing. The MAP line had a tiny leak around the nipple on the plenum, smaller line fixed that. I also can see smoke coming from two locations deep under the plenum. One coming from possibly around the actuator between cylinder 6/8 and the other deep below the injectors on cylinder 2.

Anyone thoughts on what could be leaking in those areas?

Looking at some diagrams, looks like the bearings for the secondary throttle shafts are roughly in these locations.

[lguthrie123]

Any luck?

[ssmith95]

Originally Posted by lguthrie123

Any luck?

Yes and no. Marc had me check to make sure the IAC pintle was fully extending and it is not. I tested two IACs with the same result.



At this point it is looking like an ECM issue. I need the car this weekend but will hopefully be able to send Marc my ECM next week for him to test.

[lguthrie123]

Well, let us know what happens.