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Gm Tbi

JOOP

JOOP

I WON a COOKIE
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What would cause a high idle?? For some reason I'm idling about 1800 rpms...
 
Vacuum leak. cold idle isn't close to 1800 so the cpu is trying to compensate for the extra air (vacuum leak) just a guess based on the info given.
 
Binder said:
About a million different things. Check the trouble codes first.
Click to expand...

No trouble codes... Yesterday the CEL light came on and it ran like ****. But then 10 seconds later it was fine. Only happened twice, and now no light.


My first guess was the TPS. I adjusted it, no affect. Now I need to search for a leak. :booo:


Oh some info would probably help. 4.6 stroker inline 6 with GM TBI.
 
PORTER said:
Throbble body gasket.
Click to expand...

WTF is a "throbble"???:haha: :haha: :haha:


I'm thinking that. I just check all 4 of the vacuum lines, they are all still in new condition, no cracks, splits, nice and snug. So after I get a snack I'm going to tear this puppy apart, seal it and see what happens. :booo:
 
JOOP said:
No trouble codes... Yesterday the CEL light came on and it ran like ****. But then 10 seconds later it was fine. Only happened twice, and now no light.


My first guess was the TPS. I adjusted it, no affect. Now I need to search for a leak. :booo:


Oh some info would probably help. 4.6 stroker inline 6 with GM TBI.
Click to expand...

Didn't realize it was an inline w/ GM TBI---check the codes as binder said--should at least give you some direction....
 
Hmm not to mean to hijack your thread, but do you have a hose going near the air intake that pulls vaccum?

I found a hose just sitting there pulling vaccum, and when I put my finger on it, it causes the engine to spudder (and probably die if I hold it there long enough)

Is there supposed to be a 'rouge' hose with vacuum on these?
 
Nope only vacuum line goes to the EGR then to the Carbon Canister. One other one is for the PCV, then the other to the MAP sensor.
 
hmmm would explain why I see the egr valve code come up... now I just have to find the damn EGR valve :P
 
joop, on my 94 chevy adjusting the tps didnt work. I would get random CEL's, it would run odd, and then go away, leaving me with just the high idle. i had to replace the tps. so, if the vacuum leak isnt it, i would try that.
 
JOOP said:
Jeep?? side of your intake.. Round metal thing. should be under the throttle body.
Click to expand...

hmm its a 4runner with a 350swap. I didn't think I saw anything attached to my intake, I'll have to take another look. I'm wondering if the guy who did the swap intentionally forgot the egr. which would be wierd though because he put on the VSS.
 
The timing way far advanced can cause a high idle also.

Other then that I would find a way to plug the IAC fresh air inlet hole and see if it still idles more then about 5-600 RPM if it dose you have an air leak like most are saying. IF it dies and the timing is correct then most likely the Idle Air Control valve is kaput.
 
wazz said:
The timing way far advanced can cause a high idle also.

Other then that I would find a way to plug the IAC fresh air inlet hole and see if it still idles more then about 5-600 RPM if it dose you have an air leak like most are saying. IF it dies and the timing is correct then most likely the Idle Air Control valve is kaput.
Click to expand...

Man I hope not. I think the IAC is spendy if I recal correctly. Well I'll give that a shot. I spray break clean around the gasket and the idle changed a bit. So the gasket is looking like the suspect, but I'll give your test a shot. :awesomework:
 

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