Question about 2003 Ford Focus
If the idle speed is not steady, you could have a vac leak, a dirty throttle body, or a faulty idle air control valve.
Posted on Dec 08, 2012
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Posted on Jan 02, 2017
SOURCE: 1997 ford ranger idol problems
MIGHT be the tps
The TPS is sensitive to heat, moisture and vibration leading to the failure of some units. The sensor is a sealed unit and cannot be repaired only replaced. A TPS may fail gradually leading to a number of symptoms which can include one or more of the following: -
Posted on Feb 26, 2009
Check the exhaust manifold gasket. I have a 2003 SVT Focus I had a problem with it loping at low RPMs. I had a free flow exhaust system. When I bought a new exhaust manifold I replaced the gasket and the problem went away.
Posted on Apr 08, 2009
It's a check engine light, have it checked right away. If you take it to a Ford dealer, they can give you a very detailed diagnosis, however they also charge about 80 bucks just to do that. If you take it to an auto parts store (AutoZone, Advance Auto Parts, NAPA, etc.) they will often be able to check for free, but it won't be the most detailed solution.
Posted on Jun 25, 2009
You most likely have a big vacuum leak. PCV hose split or a bad Idle Air Control motor (IAC)
Posted on Sep 27, 2009
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