09-04-2015, 06:50 PM
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#1
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GX Member
Join Date: Dec 2009
Location: CT
Posts: 68
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Erratic idle and stalling
I have to feather the throttle when stopped in traffic, it will stall if I don't. Also I have to open the throttle to start it, and it also feels like a very breif stumble on the highway as I ease off the throttle. No codes are stored, the CEL is not on. I replaced the IAC simply because I wound up with a new one on the shelf, it made no difference. Also I swore I could hear a vacuum leak at the intake, sprayed with throttle body cleaner and got a better idle at one port, so I changed both the upper and lower gaskets, no difference  .
And the motor only does this when fully warmed up to operating temp, when it's cold and as it warms up it seems normal.
What do you guys think I should check or test? Is there anything else you need to know? TIA.  |
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09-06-2015, 02:00 PM
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#2
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GL Member
Join Date: Dec 2013
Location: Minnesota
Posts: 593
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It may be a fuel related issue.
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09-06-2015, 06:26 PM
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#3
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GLS member
Join Date: Aug 2010
Location: indy
Posts: 8,411
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Sounds like a bad IAC valve.
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Quote:
Originally Posted by tipnitty
A girl touched my Pee Pee. So you can say things are getting pretty serious for me.
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09-07-2015, 05:52 PM
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#4
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GX Member
Join Date: Dec 2009
Location: CT
Posts: 68
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Quote:
Originally Posted by sleepyalero
Sounds like a bad IAC valve.
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I agree, that's why I replaced it. |
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09-07-2015, 08:37 PM
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#5
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GLS member
Join Date: Aug 2010
Location: indy
Posts: 8,411
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Whoops, didnt see that in the original post, my bad.
__________________
S. . .L. . . E . . .E. . .P. . .Y. . .IS A TRAITOR--HE GOT BORED SO HE SOLD ME AFTER HAVING AN AFFAIR WITH A RICE ROCKET
Oldsnut is my Hero!
Meet Destiny, shes a 2001 Oldsmobile Alero GLS, F40 6MT swap. (#2 of 3)
2/24/14 - 200,000 miles body/motor. 22,300 on F40.
Quote:
Originally Posted by Oldsnut
He would Plasti Dip his pecker if he could.
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Quote:
Originally Posted by tipnitty
A girl touched my Pee Pee. So you can say things are getting pretty serious for me.
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09-07-2015, 08:38 PM
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#6
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GLS member
Join Date: Aug 2010
Location: indy
Posts: 8,411
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This is a tough situation, you really may just have to take it somewhere to be diagnosed....
__________________
S. . .L. . . E . . .E. . .P. . .Y. . .IS A TRAITOR--HE GOT BORED SO HE SOLD ME AFTER HAVING AN AFFAIR WITH A RICE ROCKET
Oldsnut is my Hero!
Meet Destiny, shes a 2001 Oldsmobile Alero GLS, F40 6MT swap. (#2 of 3)
2/24/14 - 200,000 miles body/motor. 22,300 on F40.
Quote:
Originally Posted by Oldsnut
He would Plasti Dip his pecker if he could.
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Quote:
Originally Posted by tipnitty
A girl touched my Pee Pee. So you can say things are getting pretty serious for me.
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09-08-2015, 08:28 AM
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#7
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Aleromod part owner
Join Date: Nov 2003
Location: Far Northeast Philadelphia, PA
Posts: 18,199
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IAT sensor wires still intact?
My car did some of that stuff and I found both wires broken off the sensor 
Could also be a MAF. They are a bitch when they go out. Try cleaning it first. Sometimes those wires get crudded up real good. I wouldn't use anything but MAF cleaner either.
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Last edited by Redog : 09-08-2015 at 08:31 AM.
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09-08-2015, 09:22 AM
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#8
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GL Member
Join Date: Dec 2013
Location: Minnesota
Posts: 593
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Quote:
Originally Posted by sleepyalero
This is a tough situation, you really may just have to take it somewhere to be diagnosed....
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I agree with you sleepy. I thought IAC as well. Even had a suspicion of a bad torque converter. The car needs some data ran on it while it's trying to stall so you can see what's going on. |
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09-08-2015, 11:13 AM
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#9
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GLS member
Join Date: Nov 2007
Location: Fort Knox area, KY
Posts: 2,120
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Quote:
Originally Posted by AXLE
I have to feather the throttle when stopped in traffic, it will stall if I don't. Also I have to open the throttle to start it, and it also feels like a very breif stumble on the highway as I ease off the throttle. ...........................And the motor only does this when fully warmed up to operating temp, when it's cold and as it warms up it seems normal.
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You could scan it from cold to hot as it warms up, and observe if the problem occurs when the PCM goes from open loop to closed loop. The MAF sensor (and O2 sensor) take over fuel trim management at that point. |
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09-10-2015, 02:47 PM
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#10
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636 whp
Join Date: Aug 2006
Location: AZ
Posts: 11,907
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IAC/TPS/vacuum
for sure
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