Running too rich
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Running too rich
I have a 86 F150 with a 300 and a four speed. I bought it about a week ago. I have had some problems with it running too rich. At first it would start and run until it was warm then it would shut off. It would flood. I unplugged the throttle position sensor then it would stay running but its still running too rich, I dont know the voltage of the T.P.S yet i will check that out this weekend. I am woundering if it could be the HO2S or something please help this is my daily driver. thanks
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Joined: Jan 2001
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From: Virginia
Can you pull the codes on this truck? You should be able to if it's a EECIV computer. I would also look down the carb throat with a flashlight while it's running. If you see liquid fuel dripping down into the engine, you may have dirt or float problems inside the carb.
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Joined: Jan 2009
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From: East Tennessee
I swear, if I had to guess, I'd say 80%+ of the problems that occur with the EFI trucks are TPS problems, lol. I had a bad one when I first got my truck a year and a few months ago. Here we are, hell raising, drunk 4x4ing later, and had no problems or had to do ANYTHING besides put gas in it, change oil, grease it, etc. (maintenance).
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Put T.P.S in did wonders, until it gets hot, about 4 miles down the road, then it has no power its like its running too lean now, but i opened the hood and it was dark out the exhaust mainfold was glowing red, could that be signs of clogged converters i also changed the O2 sensor the old one was blown apart. please help again. thanks
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Joined: Jan 2001
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From: Virginia
Sounds like the computer is still having problems, or getting the wrong info. When it's cold, it's in open loop, and it gets the fueling info from the memory of the computer. After the engine warms up, the oxygen sensor is warmed up enough so the computer goes into closed loop. It then looks at the oxygen sensor for the fueling info. I would still try to pull the codes if you can, and see what it says.
If you want to experiment, you could unplug the oxygen sensor and see what it does. This will prevent the computer from going into closed loop, and you can see how it reacts.
If you want to experiment, you could unplug the oxygen sensor and see what it does. This will prevent the computer from going into closed loop, and you can see how it reacts.
