86 rough idle and stalling when hot

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May 12, 2014 | 03:07 AM

tintmandevin

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Heel & Toe

Joined: May 2014

Posts: 23

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86 rough idle and stalling when hot

Late model 86 has rough idle after hot start. Runs fine from cold start. After car is warm and restarted it starts terrible idle from 1300 rpms down to 500 then back up. Sometimes stalls out. Only when hot. Car has new tps, iac, ecm. I bought iac from autozone for $35. Any chance I bought defective part?

May 12, 2014 | 03:58 AM

65Z01

Team Owner

Joined: Dec 2000

Posts: 90,675

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From: SE NY

Cruise-In II Veteran

Are there any stored codes?

How is manifold vacuum before & after the rough idle?

May 12, 2014 | 06:46 AM

gerardvg

Safety Car

Joined: Aug 2009

Posts: 3,745

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From: Melbourne, Victoria, Australia

Sounds like the EGR valve stuck and not closing fully, remove the vacuum hose at the EGR solenoid. Then check the EGR valve opens and closes fully.

May 13, 2014 | 04:15 AM

tintmandevin

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Heel & Toe

Joined: May 2014

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Thanks gerardvg. I will check egr later today. Seems like there are several posts very similar to mine. Ill post results when I check. Car is running all emission systems. Probably lady owned because it is completely stock. Been working through minor problems for a year now but this idle problem is annoying.

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