nasty backfire
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From: WISCONSIN
nasty backfire
here is what i did i took the 300 out of my 88 f150 and put in a 1990 5.8l and after getting it started it has a bad backfire out the rightside at idle and a loud popping backfire out the leftside when on the throttle. the only thing not hooked up is the oxygen sensor. it also lopes like i put put a cam in it but i didn't it don't think it has cam and i don't think it is out of time but i havenot checked.
any help would be greatly appreciated
any help would be greatly appreciated
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From: WISCONSIN
please read and post any help
would i have to change anything electronic like the comoputer or get a chip to run the 5.8 because i havent done anything at all like that.
the 88 f150300 had differnt wires than the 5.8 which had four round plugs white black brown and grey. so i checked my 89 f150 parts truck that had a 300 in it and it had the same plugs as the 5.8 so i changed the harness from the firewall to the battery and from the firewall to the tailights. any thing else i need to do to the wiring. i had the the motor running but never to good not on all 8. does the computer need to be reprogrammed if so how do i do that.
i really need to get this truck running it is all i have to drive.
please help
would i have to change anything electronic like the comoputer or get a chip to run the 5.8 because i havent done anything at all like that.
the 88 f150300 had differnt wires than the 5.8 which had four round plugs white black brown and grey. so i checked my 89 f150 parts truck that had a 300 in it and it had the same plugs as the 5.8 so i changed the harness from the firewall to the battery and from the firewall to the tailights. any thing else i need to do to the wiring. i had the the motor running but never to good not on all 8. does the computer need to be reprogrammed if so how do i do that.
i really need to get this truck running it is all i have to drive.
please help
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Joined: Dec 2003
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From: Memphis, TN USA
Originally posted by EPNCSU2006
Are you running the computer from the 300? If you are, then that is your problem. Get a computer for a 351 and one that is for the transmission in your truck.
Are you running the computer from the 300? If you are, then that is your problem. Get a computer for a 351 and one that is for the transmission in your truck.
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From: Connecticut
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Senior User
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From: Connecticut
Also, is the wiring harness wired the same between the computer and the engine on the 2 different engines?
Mark
Mark
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From: WISCONSIN
thank you i will try to find a computer for it.
will the computer out of 1995 f150 5.8 work or do i need one from an 87-92 f150?
it is a 4spd manual trans does that mean id need a computer for the 5.8 with a 4 spd manual trans also or will one fom an automatic work for me?
will the computer out of 1995 f150 5.8 work or do i need one from an 87-92 f150?
it is a 4spd manual trans does that mean id need a computer for the 5.8 with a 4 spd manual trans also or will one fom an automatic work for me?
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From: Connecticut
I am not an expert on swaps but I would think the computer's timing and fuel mapping would be different on an auto vs. manual. Also the 95 computer for an auto would be looking for the E4OD I believe. The auto computer would have outputs for the torque converter clutch, shift solenoids, etc. It may have inputs sensing transmission status. I would find one from a vehicle with the same transmission and engine, same year if possible. Get the harnesses between the computer and engine/transmission while your at it.
Mark
Mark
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From: WISCONSIN
i got the computer from napa for $112. now the truck runs good no misses or anthing. but it has no power it will not accelerate at all (slower than 55mph in a 1/4 mile) it will not burn the tires at all. shouldn't a regular cab short box 351 4 spd with a k&n replacment filter and pace setter shorty headers with 3 inch cat back dual exhaust be able to break the tires loose on wet blacktop. do i need a chip because of the exhaust and the headers.
please reply i need any help i can get thank you
please reply i need any help i can get thank you
