Idling problems
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New User
Joined: Jul 2010
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Idling problems
I have a 91 F250 with a 5.8L engine. It is idling very rough and smoking black when idling. I have replaced the fuel pressure regulator, O2 sensor, Throttle position sensor, EGR and PCV valves, EGR solenoid, idle control sensor, map sensor and air temp. sensor. As well as new plugs, distributor, cap, and rotor. I had it put on the scanner and the codes pointed to the map sensor and air temp sensor. I replaced them both but it is still running the same. Any ideas?
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
I see you have a new FPR, what is the pressure at idle with the vacuum hose attached and disconnected?
You can pull the codes yourself with a piece of wire or purchase a code reader for ~35 USD. I suggest you clear the codes then rerun the tests to verify you did not install a faulty part or have a wiring issue.
You can pull the codes yourself with a piece of wire or purchase a code reader for ~35 USD. I suggest you clear the codes then rerun the tests to verify you did not install a faulty part or have a wiring issue.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
Many people have purchased one from Amazon.com: Equus 3145 Ford Digital Code Reader: Automotive
