1990 Pontiac Firebird Q&A
1990 Pontiac Firebird Question: low idle
I'm putting an '89 Formula back together. The engine runs but the idle is low and jumps from 6 to 800 rpms. I tried a new maf sensor (that's the code I'm getting) but that didn't work. Spark plugs, wires, injectors are all new. I have read of others having this same problem. Could it be the EGR solenoid? Thanks for your help. - curtw
The idle is conttrolled by the IAC motor (idle Air Control). The iac is a valve that adjusts airflow. What you have to do is remove the iac, clean the housing and throttle plates of carbon, then reinstall. Then you have to set the minimum aire rate. All these means is position the iac in the fully extended position, disconnect it so the ecm will not change its position, then adjust the idle to around 550 rpm's. If you had a scanner the counts should be below 20 which indicates the postion of the iac. I would start with this first. if you suspect the egr valve is not closing as it should at idle, then remove it and plug the vacuum leak created from the missing egr valve. If the idle goes to normal, suspect faulty egr or it is being commanded incorrectly from the ecm to open. - baccurate
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