1986 Ford F-150 Flooding problem

JFARRAR35

MEMBER
1986 FORD F-150
5.0L
V8
RWD
AUTOMATIC
140 MILES

My 1986 Ford F-150 has neen having a bad flooding problem when its cranked the RPMs generally stay between 1500-2000 then I wait for them to lower and they go to normal like 900-1000 then they will start rising and dropping and the truck wants to kill out. It is flooding because I smell gas and see that its being expelled through the tail pipe due to the black grim on the outside of the pipe. I've changed the plug wires and the fuel pressure regulator and even reset the computer system and its still flooding. I need to know a series of possibilities that could be resulting in this so I can repair it. It is an EFI too no carb. Thank you!

3 Replies

JOHNNYT73

MECHANIC
924 POSTS

Try unplugging the oxygen sensor and start it up and see if the problem continues.

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Thursday, April 2nd, 2015 AT 10:53 AM

JFARRAR35

MEMBER
1 POST

I unplugged it and it corrected the rising and lowering idling but its still flooding so should I check the EGR valve next maybe for buildup of carbon. All others sensors have been replaced.

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Friday, April 3rd, 2015 AT 6:46 AM

JOHNNYT73

MECHANIC
924 POSTS

Ok, your o2 sensor may need replacing. As for the flooding. Check to make sure your coolant level is good. Remove throttle body and clean the back side of it (you will need a new gasket). Have you checked your throttle position sensor? You can try cleaning your EGR. I would go to Oreillys auto parts and buy their frod OBD1 reader with the digital display. It's only about $32 and can really help point you in the right direction.

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Friday, April 3rd, 2015 AT 7:32 AM