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Old 06-27-2012, 10:30 PM   #1
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Default my truck sputters and bogs down upon acceleration

Hello i have a 1993 f150 xl 5.0 4 speed stick that has just started to sputter and bog upon acceleration, but it starts sputtering and bogging after about 5 minutes of driving it. I have replaced the map sensor, egr valve, egr position sensor, fuel filter, o2 sensor, fuel pressure regulator, ignition coil, and the spark plugs. If anyone can give me some answers on what my problem can be it will very helpful. Thanks
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Old 06-29-2012, 12:47 AM   #2
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First, always check for codes....always. There's a sticky at the top of this forum that tells you how. Second, I'd be looking more toward the TFI module, maybe even the TPS. The TFI is the electronic module mounted to the side of the distributor. If you can get it off of there, AutoZone can test it. While you're there, rent a fuel pressure gauge and see what your reading is at the rail both KOEO and KOER.
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Old 06-29-2012, 02:08 AM   #3
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id look into the TFI first honestly. after checking for codes.

on a side note, is the TFI mounted on the distributor only on very few trucks or what? all my rigs/and ones iv worked on got it on the drivers fender under the brake booster.
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Old 06-29-2012, 03:45 PM   #4
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I think up to 91 the TFI modules were on the distributor, then on the 9th gens they mounted them on the fender. But not 100% sure on that.
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Old 06-29-2012, 04:05 PM   #5
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ok sounds good i will check the tfi module and see if thats any good i will keep you guys updated on any thing i find.
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Old 06-29-2012, 04:11 PM   #6
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Quote:
Originally Posted by sylver91 View Post
I think up to 91 the TFI modules were on the distributor, then on the 9th gens they mounted them on the fender. But not 100% sure on that.
yea the 92 im working on has it on the fender, along with my 96 and 97. but its nice to know lol.
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1996 f150 XLT, 5.0/302, 4sp auto/OD, extended cab short bed, 107k miles. TOTALED
1998 ram 1500, SLT Laramie, 5.2/318, 4x4, with 4sp auto/OD, quadcab, shortbed, 147k miles.
1992 f150, XLT 5.0/302, 4 sp auto/OD, extended cab, short bed, 107k miles.
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Old 06-29-2012, 05:52 PM   #7
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so I brought my truck into a mechanic shop today and he said both of my fuel pumps are bad and that is what is causing my problem does this sound right to any of you?
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Old 06-29-2012, 06:40 PM   #8
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so I brought my truck into a mechanic shop today and he said both of my fuel pumps are bad and that is what is causing my problem does this sound right to any of you?
If the fuel pressure is low after changing the filter and regulator then yes.
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