got wierd idle surge
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Joined: Feb 2006
Posts: 682
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From: newcomerstown,o
Car: 91 formula
Engine: 350 tpi
Transmission: auto
Axle/Gears: poss
got wierd idle surge
motor was completely warmed up. in park it keeps revving up to 1100 rpm then back to 850 rpm. just keeps doing that. except for the other day when it went to 1100 and stayed there til I turnt it off and restarted it then it stayed at 850 in park.then 650 in gear.
Joined: Nov 2008
Posts: 2,093
Likes: 175
From: Milwaukee
Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Re: got wierd idle surge
Surging idles are typically caused by vacuum leaks. There are a lot of places for a TPI manifold to leak. I'd start looking for a busted line or bad gasket.
Thread Starter
Senior Member
Joined: Feb 2006
Posts: 682
Likes: 0
From: newcomerstown,o
Car: 91 formula
Engine: 350 tpi
Transmission: auto
Axle/Gears: poss
Re: got wierd idle surge
definetly not a vacuum leak. gasket aren't that old . do you think egr valve can cause my problem?
Joined: Nov 2008
Posts: 2,093
Likes: 175
From: Milwaukee
Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Sure. If the valve sticks open or the solenoid is not releasing the vacuum to the egr, it'll act like a vacuum leak. I wouldn't rule out a vacuum leak if you just had it apart, too easy to miss something on these. That includes the egr that you're questioning.
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