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Rough Idle

rseeley

Member
Joined
November 13, 2001
Messages
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City, State
Syracuse, New York
Year, Model & Trim Level
'91
I have a '91 with 248k. When I bought it last year, it had a very rough idle when cold. I replaced the IAC and it solved the problem.
Recently the problem has come back. When cold it will not idle. When warm it idles at about 500rpm and sometimes stalls out. When I give it gas, it runs strong and smooth.
Fuel filter, plugs and wires all changed last year.
I have checked the IAC again, and it is working.
From what I have read, it sounds like it could be the O2 sensor.
Does this sound like a good place to start?
Thanks in advance for any suggestions.
Rob
 






MrShorty

Explorer Addict
Joined
December 27, 2001
Messages
5,078
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City, State
Spanish Fork, UT
Year, Model & Trim Level
92 XLT and '87 Bronco II
I think it might just be the IAC (and at that age the entire upper intake manifold and throttle body) are getting dirty.
 






rseeley

Member
Joined
November 13, 2001
Messages
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City, State
Syracuse, New York
Year, Model & Trim Level
'91
I have a friend who works for Napa and yesterday he gave me a new IAC to try. I put it on and there was no change.
I cleaned the throttle body last year. Could it need it again?
The rough idle started pretty abruptly. It started right after I filled up with gas. I thought I had gotten a bad tank of gas, but that was not the case. I put in dry gas and then injector cleaner - no change. I then filled up with high octane- still no change.
Any other suggestions?
 






dogfriend

Human-Animal Hybrid
Joined
July 22, 2002
Messages
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City, State
Carmichael, CA
Year, Model & Trim Level
'97 Sport 4x4
check this thread

I think this thread covers almost everything about rough idle.

Dead Link Removed
 






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