Fuel Mixture (HELP!!!!!!!!!!!!!!)
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Freshman User
Joined: Feb 2002
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Fuel Mixture (HELP!!!!!!!!!!!!!!)
Our truck is running very rich, it hardly holds idle when it is cold and runs rich no mater what after it warms up. How do you take a computerized fuel injected engine that is runing rich and make it run leaner?
Aaron
very frustrated Ford Owner
1992 Ford F-150 - Flareside
4x2
302
Automatic
Aaron
very frustrated Ford Owner
1992 Ford F-150 - Flareside
4x2
302
Automatic
Posting Guru
Joined: Apr 2000
Posts: 1,746
Likes: 4
From: PNW
Fuel Mixture (HELP!!!!!!!!!!!!!!)
Check the fuel pressure regulator. If it fails such that you get high pressure, the computer can't compensate and it will run rich. You'll need a fuel pressure gage. If the diaphragm fails, fuel will leak through the vacuum line into the engine and cause flooding. To check for this, just pull the vacuum line at the regulator and see if there is gas in it.
New User
Joined: Jun 2002
Posts: 19
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From: Edmonton Canada
Fuel Mixture (HELP!!!!!!!!!!!!!!)
Also try checking your IAC, may be faulty. A good way to tell if its fouled up is look inside of it...if its dirty then its prob not working right. Just in case your not sure what an IAC is, its on the l/side of the throttle body.
-MercMan
-MercMan
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From: PNW
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Senior User
Joined: Mar 2002
Posts: 208
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From: Palm Coast USA
Fuel Mixture (HELP!!!!!!!!!!!!!!)
Don't forget the O2 sensor as it can cause a rich condition, but probably not as pronounced as your case sounds. Since you replaced all those items I'm sure you reset the pcm but if not it might help? Good luck.
RSH
RSH
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From: Shawnee
Fuel Mixture (HELP!!!!!!!!!!!!!!)
>Our truck is running very rich, it hardly holds idle when it
>is cold and runs rich no mater what after it warms up. How
>do you take a computerized fuel injected engine that is
>runing rich and make it run leaner?
>
>Aaron
>very frustrated Ford Owner
>
>1992 Ford F-150 - Flareside
>4x2
>302
>Automatic
My 87 302 did that also. Extreme flooding all of the time. It turned out to be the fuel pressure regulator as "Mikeman" said is his responce. I pulled the vacumn hose off and out squirted gas and I knew I had found it.
>is cold and runs rich no mater what after it warms up. How
>do you take a computerized fuel injected engine that is
>runing rich and make it run leaner?
>
>Aaron
>very frustrated Ford Owner
>
>1992 Ford F-150 - Flareside
>4x2
>302
>Automatic
My 87 302 did that also. Extreme flooding all of the time. It turned out to be the fuel pressure regulator as "Mikeman" said is his responce. I pulled the vacumn hose off and out squirted gas and I knew I had found it.
