1999 Buick Century Repair Question
High idle issue and intermittant shifting cause IAC, TPS?
Dennis
Asked by dlvaughn1963Answer
The tps can cause a high idle and a hard shift.Did you clear codes after plugging everything back in?
I have not cleared the codes yet. I will have to go to Autozone to have them cleared. I also found the fuse for the O2 sensor was blown too. Might be possible I have bad sensors
if the codes are not cleared will it still have an effect on the idle speed? The check engine light seems to come on and go off intermittently
The blown fuse might have just been a shorted wire to the exhaust etc?Clear the codes and see which ones come back?Let me know the exact code numbers not code descriptions.
Keep me posted.
Codes: p0134,p1635, p0401, p0101, p0108
To negate most of these prior to these codes the only one
I knew was probable was the O2 sensor code due to finding a blown
Fuse in the engine elect panel. I had disconnected every electrical
Connector on or around the top of the engine near the throttle body (map sensor, tps, iac, egr). A total of 5 connectors to see if there would be a change in performance and there was none. The one thing I have ordered is the PVC line assy because its bad. Won't tell you what the previous owner used. Would this line from the evap canister to the PVC cause this problem or do I have issues with the iac or tps? The iac was cleaned with no change less its internally shorted.
So the codes you listed are the ones that came back after you cleared them after plugging everything back in?Also you have a tee off the pcv hose that feeds vacuum to the evap canister purge solenoid?If that hose is leaking that would cause high idle etc.It shouldnt go directly to the charcoal canister or that will cause a problem also the vacuum flow to the canister is controled by the solenoid.Make sure the solenoid isnt stuck open?
I cleared the codes today. I've ordered the evap/PVC hose an it should arrive tomorrow. So I'll know what happens. That hose caused my problem?? Guess ill see tomorrow.
If its leaking vacuum it can cause a high idle etc.