Confused
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Senior User
Joined: Mar 2004
Posts: 106
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From: Bryant Arkansas
Confused
Ok guys, help me out. I have a 93 ford escort with the 1.9L engine. It started dieing the other day at random times and the check engine light came on. I had a shop pull the codes and one was for the MAF senser and one was for an out of range temp senser. I replaced both and now it seems to run ok but as it warms up the idle goes real low (about 500 rpm). I cannot figure out what controls the idle and how to fix it. Any thought or suggestions?
Post Fiend
Joined: Jun 2002
Posts: 13,873
Likes: 3
From: Atlanta GA
Sorry, I have not worked on Escorts that much, but, if this were a Ford truck and there were no codes then I would suspect the IAC on the side of the throttle body. Especially on a OBDI/EEC-IV system because it has no effective feedback to the CPU.
They load up with grime and such and stop working correctly. If you search the BII/2.9 forums you will find information about how to clean them. Clean it and see if it makes a difference. If it does, then clean the whole throttle body and put a new IAC on (about $50).
I looked this up at Autozone and this would be part #
IDLE AIR CONTROL VALVE
Wells TV212 $42.99
As for the temperature sensor, I just want to point out that on the EEC-IV it will report out of range if the engine is not warmed up enough. This usually means driving it and not just an idle.
Before I replaced any more parts, I would disconnect the battery for a few minutes, then reconnect it, and go for a city and highway cruise (varied speeds) of at least 10 miles and then see how it behaves or the codes that are pulled.
They load up with grime and such and stop working correctly. If you search the BII/2.9 forums you will find information about how to clean them. Clean it and see if it makes a difference. If it does, then clean the whole throttle body and put a new IAC on (about $50).
I looked this up at Autozone and this would be part #
IDLE AIR CONTROL VALVE
Wells TV212 $42.99
As for the temperature sensor, I just want to point out that on the EEC-IV it will report out of range if the engine is not warmed up enough. This usually means driving it and not just an idle.
Before I replaced any more parts, I would disconnect the battery for a few minutes, then reconnect it, and go for a city and highway cruise (varied speeds) of at least 10 miles and then see how it behaves or the codes that are pulled.
