007_SuperCoupe
Registered User
Okay, I'm at my witts end! I don't know where to go from here. My idle trouble began several months ago and I have been seemingly throwing parts at it since then and nothing is working. Here's what the cars does, (the small version). It dies. Whether in gear or 'N' or 'P' it doesn't matter. I have to keep my foot on the accelerator and keep the RPMs above 1k (in gear) or about 2k (in 'P' or 'N'). It doesn't die right away, though. In 'P' it will idle for 3-4 minutes, fluctuating between 700-800 RPM and 100-500 RPM. It acts as if it is missing, but only when below 1k RPM. The symptom are about the same when in drive as well.
Here's my car in a nutshell:
'89 auto
92,XXX miles
Here's what I have done to try and fix this idle problem:
Pulled codes (O2 Sensors bad)
new O2 sensors (about three weeks ago), on the way home new CE code!
Pulled codes (Canister Purge Circuit Failure)
new canister purge solenoid
NO NEW CODES
Things that I have done about 5k miles prior to any idle trouble:
New plugs and wires
New DIS module
Mods and upgrades to the car at about the same time:
'95 supercharger
1.73 roller rockers
New radiator
New thermostat
Removed Air Silencer
and other minor fixes that don't come to mind right now
The things that I have thought about and checked:
All visible vacuum lines--all seem secure, no leaks found
All electrical connections firmly together (plug wires secure)
Engine mounts check out ok
MAF checked for cleanliness (ok)
Thoughts that I have about what may be wrong:
Fuel Pump: No loss of top end power, so I'm guessing it is ok for now
Fuel injectors: Could be one or two not working properly, but again, no problems when about 1k RPM
IAC: Not too sure about this one. From what I have seen, when the IAC goes, 90% of the time, the idle goes up, not down.
My car runs great at WOT. No hesitation, not missing. Just power. And under normal highway driving it runs great. No symptoms there what-so-ever. Problem is only evident when I am at a stop.
Does anyone have any thoughts or suggestions? I really don't have the $$ to continually throw parts at it until I get it right. And this is my daily driver to boot, so I really need it running.
Here's my car in a nutshell:
'89 auto
92,XXX miles
Here's what I have done to try and fix this idle problem:
Pulled codes (O2 Sensors bad)
new O2 sensors (about three weeks ago), on the way home new CE code!
Pulled codes (Canister Purge Circuit Failure)
new canister purge solenoid
NO NEW CODES
Things that I have done about 5k miles prior to any idle trouble:
New plugs and wires
New DIS module
Mods and upgrades to the car at about the same time:
'95 supercharger
1.73 roller rockers
New radiator
New thermostat
Removed Air Silencer
and other minor fixes that don't come to mind right now
The things that I have thought about and checked:
All visible vacuum lines--all seem secure, no leaks found
All electrical connections firmly together (plug wires secure)
Engine mounts check out ok
MAF checked for cleanliness (ok)
Thoughts that I have about what may be wrong:
Fuel Pump: No loss of top end power, so I'm guessing it is ok for now
Fuel injectors: Could be one or two not working properly, but again, no problems when about 1k RPM
IAC: Not too sure about this one. From what I have seen, when the IAC goes, 90% of the time, the idle goes up, not down.
My car runs great at WOT. No hesitation, not missing. Just power. And under normal highway driving it runs great. No symptoms there what-so-ever. Problem is only evident when I am at a stop.
Does anyone have any thoughts or suggestions? I really don't have the $$ to continually throw parts at it until I get it right. And this is my daily driver to boot, so I really need it running.