Idle Problem

[qtdr]

I have a 87 that lopes at idle. I also get codes 12,42 & 92. I increased the idle speed just to keep it running. I have changed the o2 sensors, checked the purge soldnoid, had the ignition scoped and everything seems good. Any suggestions would be appreciated.

[peppermrj]

Will this help?
http://www.svtsnake.com/tech/eeciv.html

[peppermrj]

Fuel injection cleaner. Seafoam or chevron with techron.

[Nick]

I'm not sure what the codes are, but SEFI idle issues usually fall to the EGR valve, dirty throttle body/throttle body spacer, and dirty IVR filter. There are tech articles that address each of these issues and how to clean each part.

[gadget73]

Rich running and poor idle usually indicates a vacuum leak. 12 is cannot control idle, and the other two codes show the oxygen sensors detecting a rich condition on both sides. Check for cracked vacuum lines, especially at the MAP sensor.

[pro-five-oh]

Clean EGR valve, clean (or replace) IAC valve, clean EVR filter, check for bad vacuum lines everywhere.

More info is available in the TECH section.

[qtdr]

Thanks for your help. Unfortunately its been too cold to work on it. Will keep you posted.

[qtdr]

Turns out is was the throttle position sensor. Thanks, I'm sure I'll be back with another problem.

[peppermrj]

Thanks for the update.

[sam_sayz]

I'm about to suggest, to check your throttle position sensor... Because When my brother had the same problem with his Bertone... We also thought it was his old worn out Bertone oxygen sensor (http://www.oxygensensorwholesale.com/bertone.html), but when we consulted my mechanic, it turned out that we need to just need to clean the throttle position sensor because the throttle body was coated with carbon deposits... To fix the problem, we remove and disassemble the throttle body. Then we used a toothbrush carb-cleaner to clean out the throttle body bore, the throttle plate (especially the edges), and the AIS bypass passage. After the throttle body was cleaned, the air were able to pass by the throttle plate as it should. This resulted in a high idle until the computer compensates by closing the AIS...