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Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 1992-1996 Ford F150



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  #1  
Old April 16th, 2017, 04:04 PM
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Palindrome Palindrome is offline
 

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Default irregular misfire

I recently purchased a '95 F150. 5.0 liter, 5 spd manual, 4wd. It looks real solid, starts well, has good oil pressure, no smoke, but was running pretty rough. I checked the codes and replaced the throttle position sensor, as a start. It now runs better, but still has has a soft pukka,pukka miss, that doesn't sound like it is consistent on any one cylinder. I cleared the codes, rechecked and got no new codes and one stored code (128) with the engine off. I got one engine running code (172). I've checked vacuum to the MAP sensor and there is plenty of vacuum. The engine nearly stalls when I pull off the vacuum hose and then idles a bit faster than normal with the hose plugged.

Any suggestions for next steps in the diagnostic process?

Thanks for any help.
  #2  
Old April 16th, 2017, 11:22 PM
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Do a thorough check for vacuum leaks elsewhere. I'd almost be tempted to replace the MAP sensor on general principle. How confident are you that the spark plugs, wires, distributor cap, and rotor are good?

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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Old April 17th, 2017, 01:12 AM
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Plugs, wires and etc are of unknown age. I have checked for spark with a timing light and know that all cylinders are getting spark.

What is a good way to check vacuum in other locations.
Thanks,
Bob
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Old April 17th, 2017, 10:28 AM
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Quote:
Plugs, wires and etc are of unknown age.
Replace them. Do a compression test while the plugs are out.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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Old April 23rd, 2017, 05:43 PM
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Running well now with new rotor, cap and wires. Plugs looked nearly new.
Thanks,


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