460 running rich
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460 running rich
My 94 F-350 seems to be running rich mainly noticeable at an idle with transmission engaged in a gear(automatic), strong smell of gas out of the tailpipe, rough erratic idle, put it in neutral or park and of course r.p.ms come up and it seems to smooth out seems to be running fine going down the road maybe a little worse performance than usual. 1994 F350, 4x4, efi 460, 69,000 miles. The check engine light isn't coming on, and maybe disconnected. Anyone have any ideas on what commonly causes this?
Thank You!
Thank You!
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O.K, I hate to sound dumb, but I don't have a code reader or scanner, I wouldn't be against buying one but I am not really sure what I am looking for there seems to be quite a few out there. I work as a millwright and I am very famimliar with roubleshooting things, and have done alot of mechanic work on and off the job, I just don't know a whole lot about common issues with fuel injection
Mountain Pass
Joined: Feb 2007
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From: Central Georgia
EGR Valve
EGR Valve Position Sensor
Idle Air Control Valve
Engine Coolant Temp Sensor
Intake Air Temp Sensor
Fuel Pressure Regulator
MAP Sensor
Vacuum Lines
All of the above can cause a rich condition. The following link can provide directions for testing each: http://www1.autozone.com/az/cds/en_u...rInfoPages.htm
I'd pull the codes and see what it reads. That may point you right to the problem. A thrown code does not always trigger the CEL. If you get no codes, then I'd start with the vacuum lines and make sure you don't have any leaks - particularly the MAP vacuum. Then move on to the EGR Valve, EVP Sensor, ECT sensor, FPR, IAT Sensor and the IAC Valve in that order.
EGR Valve Position Sensor
Idle Air Control Valve
Engine Coolant Temp Sensor
Intake Air Temp Sensor
Fuel Pressure Regulator
MAP Sensor
Vacuum Lines
All of the above can cause a rich condition. The following link can provide directions for testing each: http://www1.autozone.com/az/cds/en_u...rInfoPages.htm
I'd pull the codes and see what it reads. That may point you right to the problem. A thrown code does not always trigger the CEL. If you get no codes, then I'd start with the vacuum lines and make sure you don't have any leaks - particularly the MAP vacuum. Then move on to the EGR Valve, EVP Sensor, ECT sensor, FPR, IAT Sensor and the IAC Valve in that order.
Elder User
Joined: Apr 2007
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From: Los Alamos
You don't need one. Check out www.fordfuelinjection.com
They are a vast wealth of information and help, and can tell you more about your computer controls than any one post here...
They are a vast wealth of information and help, and can tell you more about your computer controls than any one post here...
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More Turbo
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Whats happening is the O2 sensor is reporting a lean condition so the computer is richening it up. Hmmm O2 sensor should be on the list above too.
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Mountain Pass
Joined: Feb 2007
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From: Central Georgia
Originally Posted by icrman
Whats happening is the O2 sensor is reporting a lean condition so the computer is richening it up. Hmmm O2 sensor should be on the list above too.
Again, pull the codes. It should give you a good starting point.
Mountain Pass
Joined: Feb 2007
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From: Central Georgia
Originally Posted by oldblue_123
In town I have a knechts, schucks, napa, carquest, and that's about it!
And if no luck...bchances link does provide advice on how to do a self-test. I just find it can be difficult for some to accurately get info out of a self test. The counting drives me nuts.
Elder User
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From: Los Alamos
Originally Posted by oldblue_123
Oregon, about 60 miles south of Eugene.
Beautiful state! Got family around Medford..Love it up there. We go up to Hells Gate almost every year..