jumping and jerking problem driving me crazy
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Joined: Mar 2010
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jumping and jerking problem driving me crazy
I bought a 1985 efi 302 ford f150 exploere and it starts and runs for ten sec then drops i start it back up hold it 3 or 4 grand and it idles up and down on its own and here and there runs perfect then goes back to acting like its flooding out if the vacum line is off it idles and runs fine ive done every elictronical part on the engine and the fuel reg and pump no diffrance im at a loss like no other with it even did intake gaskets and timming chain nothen helpppppp
Thread Starter
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New User
Joined: Mar 2010
Posts: 3
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jumping and jerking 1985
ive done throtel air valve idle pos senser map cleand out the throat power temp sensers checked vacum lines every where changed out fuel regulater and did fuel pump nothen worked still jerking and acting like its flooding out did a full tune up to that didnt work ither im at a loss with the truck only thing i can think of is the computer is throwing bad codes
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Joined: Jun 2002
Posts: 2,091
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From: Suffolk, VA USA
Any time you're dealing with an EFI engine, you want to pull codes first. There may be multiple issues going on. Unfortunately with the early EFIs, there was a common surging cold idle problem, and I've never found anyone that had a solution. With mine, I did the a complete throttle body tear down and rebuild, tested or replaced every sensor and solenoid on the thing, tried a different wiring harness, and replaced the computer, all to no avail. The throttle body tear down made things a little better, but didn't fix it. Interestingly enough, the problem dissapeared when I did the mass air conversion, even though I used all the same components except for the computer. Given that, I'm thinking its a programming problem in the 85-86 computers.
