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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old Oct 5, 2009 | 10:53 AM
  #1  
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mejer1
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Need Help

Hello,
I don't get on this site much but know I can get help here.
I have a 1992 F-150 with the 4.9 six with 240,000 miles. Last thursday nite we got alot of rain. And the truck is outside. It starts fine and runs normaly, then it starts acting like it is missing after about three or four minutes of driving. On sunday I changed the rotor and cap thinking the cap may be cracked, but no change. I also hear a pinging or backfire from the motor.
Please give me any ideas that you think it could be. This is my daily driver and work truck being I am a carpenter.

Thanks John
 
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Old Oct 5, 2009 | 11:40 AM
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From: Easton,Ks
You need to see if you have any codes in CM.

Sounds like you may have a bad TFI module, Map sensor or the PIP sensor going bad.
 
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Old Oct 6, 2009 | 05:35 AM
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Thanks for the reply, Also when the truck sits for 20 minutes or so it will run normal for a little while. And when it starts running rough I can smell unburnt gas. I am going to try to get the codes read today.
John
 
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Old Oct 6, 2009 | 07:04 AM
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From: Easton,Ks
You can read the codes yourself, if you do not know how go to one of the links below:

This is good for the KOEO test:
Ford Fuel Injection How To Run a Self-Test

This one is good for the KOER test:
Ford Fuel Injection KOER Test

Or get a code reader, here is a good one.
The EQUUS #3145
 
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Old Oct 6, 2009 | 07:23 AM
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From: southern md
I kinda had the same problem was the park plug wires-but mine ran like crap till it dried out?
the coil wire was making a bad connection on the coil and to the cap figured it might help to drop that info in?
 
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