92 F-150 engine trouble

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Nov 17, 2003 | 05:53 AM

truckguy

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From: SC

92 F-150 engine trouble

I need help. I have a 1992 F-150 302. It started as a small miss under load. I have replaced the ignition module, the stator in the distributor, the TPS, coolant temp. sensor, new plugs, new plug wires. At certain RPM's it will miss bad until I give it more gas and then it goes on. This does not happen all the time. I try to pull codes and it shows good. I don't know where to go from here.

Nov 17, 2003 | 10:30 AM

jwtaylor

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If it isn't the fuel pump(codes), you might try the cap/rotor replacement. A bad cap or moisture build up in the cap can cause these symptoms. If it happens and goes away then this may be it. Let us know what you find it the cap isn't the problem. Later

Nov 17, 2003 | 06:16 PM

truckguy

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I replaced the cap and rotor when I put the new plugs and wires on.

Nov 17, 2003 | 09:46 PM

circledirt

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From: kansas

The MAP sensor can cause symptoms like that but the only way I know to test is to replace and see if that helps. Good luck.

Nov 18, 2003 | 09:16 PM

truckguy

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Replaced MAP sensor. ran OK for a while. Just when I thought it was fixed it started missing again about 45-50 mph. But it is intermintent

Nov 20, 2003 | 06:47 AM

lakefarmoh

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I had the same problem with my 93 F-150 with a 302. Had a small skip under load. After 3 months of trying everything I could think of, I found out that I had reversed two of the plug wires when I replaced my wires and plugs. Switched them back and it ran like a champ. Might be worth a shot.