engine problems
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Freshman User
Joined: Apr 2009
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engine problems
i have a 88 f150 with a 300 straight 6. i had just recently locked the motor in it so bought another motor and put it in. it cranks up great everytime. sometimes it idles up and down and other times it idles perfect. when driving down the road sometimes it runs flawless and other times it will cut out and miss to the point it almost feels like it died out and came back. it has a new coil, plugs, wires, rotor, cap, internal fuel pump, booster fuel pump, fuel filter, tps, and ignition control module. was wondering if somebody might have any ideas. i have also blocked the egr off and bypassed the a.i.r. injection system. im kind of leaning towards the computer but not sure.
Post Fiend
Joined: Jan 2005
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I would check for vacuum leaks. Check the vacuum pipes around the engine for breaks and cracks. Check the crankcase vent system for leaking pipes. Might be worth checking the fuel pressure. And finally I would pull any stored error codes, ignore any due to the EGR valve.
For instructions go to fordfuelinjection.com and click on OBD1 self test.
Lots of other good info on there also. Hope this helps.
For instructions go to fordfuelinjection.com and click on OBD1 self test.
Lots of other good info on there also. Hope this helps.
Post Fiend
Joined: Jan 2005
Posts: 8,402
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Did you pull the codes yet?
Thread Starter
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Freshman User
Joined: Apr 2009
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i just went and checked and the vaccums are separate. i havnt been able to pull the codes yet since the guy that has the computer hasnt answered me back on when to bring the truck to his house. can the idle air control valve or the knock sensor cause any of this?
Post Fiend
Joined: Jan 2005
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You don`t need a computer. Go to fordfuelinjection.com for instructions on pulling codes using the check engine light. Plenty of good info there on sensors also.
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Freshman User
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i know how to do the self test and when i try it starts to give a code and goes blank or the engine light will stay on so i know i either have a grounding problem or the computer itself is bad
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From: In my own world
I think you found the problem then, if you can't access the computer, it can't function proprely.go over your grounds, especially the one on top of left fender, that one goes right to the computer