'87 F150 Sputtering and Knocking (low RPM's) and with load!!
05-27-2007, 09:42 PM
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'87 F150 Sputtering and Knocking (low RPM's) and with load!!
Hello,
I just purchased an '87 F150 (302). It has 180K (rebuilt around 100K) on the engine.
The problem is when the auto tranny is lugging in a higher gear (low rpms), the truck hesitates and sputters...until I give it more gas and it downshifts... at higher RPMS it is fine and dandy. It isn't too noticable when NOT towing something, but you can still feel it. The previous owner had both fuel pumps replaced and I have ran premium gas through one tank (thinking it was bad gas).
Now, when towing my boat and trailer, it knocks and sputters quite a bit if lugging in a higher gear (almost to a point where you feel that the truck is running out of gas!). I have been using first gear going up hills and taking overdrive off when not on the freeway to help with this problem (it helps a little).
Anyway, what is going on with my truck? I was thinking (and hoping) that it had something to do with the dizzy?! Fuel injectors?
What do you think?? Thanks in advance.
Paul
I just purchased an '87 F150 (302). It has 180K (rebuilt around 100K) on the engine.
The problem is when the auto tranny is lugging in a higher gear (low rpms), the truck hesitates and sputters...until I give it more gas and it downshifts... at higher RPMS it is fine and dandy. It isn't too noticable when NOT towing something, but you can still feel it. The previous owner had both fuel pumps replaced and I have ran premium gas through one tank (thinking it was bad gas).
Now, when towing my boat and trailer, it knocks and sputters quite a bit if lugging in a higher gear (almost to a point where you feel that the truck is running out of gas!). I have been using first gear going up hills and taking overdrive off when not on the freeway to help with this problem (it helps a little).
Anyway, what is going on with my truck? I was thinking (and hoping) that it had something to do with the dizzy?! Fuel injectors?
What do you think?? Thanks in advance.
Paul
06-07-2007, 10:26 PM
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I don't think its the EGR (since it just passed smog a few months ago - here in California that's a feat in itself).
I'm thinking it still might be an air leak since the plugs were a little whiter than usual (too much air = lean).
Sprayed carb cleaner on all (I think) vacuum lines and nothing happened.
Does anyone know what's goin on? MAP? Ignition module (on the side of dizzy) ?????
Thanks!
06-08-2007, 09:37 AM
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Paul
06-08-2007, 08:56 PM
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Well guess what.... my alternator completly died today
So, got a new one and plan on putting it on tomorrow morning. The guy at the store said that a bad alternator might be part of the problem of the missing/chugging, etc. We'll see.....
Paul
So, got a new one and plan on putting it on tomorrow morning. The guy at the store said that a bad alternator might be part of the problem of the missing/chugging, etc. We'll see.....Paul
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06-09-2007, 06:57 AM
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This is true. It does take voltage to fire the plugs.. Good luck.
06-12-2007, 03:12 PM
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Sputtering Ford 4.2
I have a Ford F150 with a 4.2. I had bad coil problems. On 4th one now. One was covered under warranty when the truck was new and I put in 2 myself. Just a thought. 