TPI runs rough after heating up?
Thread Starter
Joined: May 2005
Posts: 83
Likes: 4
From: Tucson, AZ
Car: '84 Trans am ‘86 Iroc
Engine: 305 auto, 305 auto,
Transmission: Automatic
TPI runs rough after heating up?
Looking for any help here. Have an '89 305 TPI set-up and runs great till it hits over 200*F then it idles rough, with no check engine light coming on. Have been told possibly the EGR, or maybe IAC idle control. Any thoughts?
Supreme Member
Joined: Apr 2010
Posts: 4,337
Likes: 29
From: Aurora, OR
Car: 87 IROC Z28
Engine: 355 cid TPI
Transmission: Custom Built 700R4 w/3,500 stall
Axle/Gears: QP fab 9" 3.70 Truetrac
Re: TPI runs rough after heating up?
Check the coolant temp sensor located just below and to the left of the thermostat. It has one black and one yellow wire going to it. Its common for these to partially fail causing fuel delivery to go south. Check it with an ohmmeter. At 70 degrees it should read 3,400 ohms. Also, the ignition module is fairly sensitive to heat. Check for igntion misfires when this problem is occurring.
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