misfiring
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Joined: Jun 2015
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misfiring
Alright so i have a 95 ford f150 with the 300 straight 6. Its been running rough, its been misfiring and bucking or jerking you. I replaced the wires, plugs, injecters, fuel filter distributer cap and rotor button and its still bucking. I dont know what else could be wrong with it. I parked it and only drove it after replacing all the parts. I heard it could be the coil pack but im not sure. If not that then i have no clue to what it would be.
Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
Check for codes.
If you can't retrieve codes or there are numerous, random codes, chances are that the PCM is failing.
Another idea for checking the PCM is to check the 5 volt reference. TPS or ECT are good candidates, actually, the TPS is the best. If you use a DVOM, then if you see erratic voltage spike from the 5 volt reference lines, then chances are the capacitors are taking a dump.
Need to try and retrieve codes first and then move on further. Post codes and we'll help you out as much as possible.
Just to mention, I had a similar problem with my '92, 300. It was exactly as you described and it would only get better in higher rpms, like around 1800-2200. Anything below that and it shook and bucked violently. Only code was for the EGR and when I pulled the PCM, the electrolyte fluid from the failed capacitors had damaged the board beyond repair.
If you can't retrieve codes or there are numerous, random codes, chances are that the PCM is failing.
Another idea for checking the PCM is to check the 5 volt reference. TPS or ECT are good candidates, actually, the TPS is the best. If you use a DVOM, then if you see erratic voltage spike from the 5 volt reference lines, then chances are the capacitors are taking a dump.
Need to try and retrieve codes first and then move on further. Post codes and we'll help you out as much as possible.
Just to mention, I had a similar problem with my '92, 300. It was exactly as you described and it would only get better in higher rpms, like around 1800-2200. Anything below that and it shook and bucked violently. Only code was for the EGR and when I pulled the PCM, the electrolyte fluid from the failed capacitors had damaged the board beyond repair.
Laughing Gas
Joined: Aug 2002
Posts: 1,069
Likes: 19
From: Central Wisconsin
Check for codes.
If you can't retrieve codes or there are numerous, random codes, chances are that the PCM is failing.
Another idea for checking the PCM is to check the 5 volt reference. TPS or ECT are good candidates, actually, the TPS is the best. If you use a DVOM, then if you see erratic voltage spike from the 5 volt reference lines, then chances are the capacitors are taking a dump.
Need to try and retrieve codes first and then move on further. Post codes and we'll help you out as much as possible.
Just to mention, I had a similar problem with my '92, 300. It was exactly as you described and it would only get better in higher rpms, like around 1800-2200. Anything below that and it shook and bucked violently. Only code was for the EGR and when I pulled the PCM, the electrolyte fluid from the failed capacitors had damaged the board beyond repair.
If you can't retrieve codes or there are numerous, random codes, chances are that the PCM is failing.
Another idea for checking the PCM is to check the 5 volt reference. TPS or ECT are good candidates, actually, the TPS is the best. If you use a DVOM, then if you see erratic voltage spike from the 5 volt reference lines, then chances are the capacitors are taking a dump.
Need to try and retrieve codes first and then move on further. Post codes and we'll help you out as much as possible.
Just to mention, I had a similar problem with my '92, 300. It was exactly as you described and it would only get better in higher rpms, like around 1800-2200. Anything below that and it shook and bucked violently. Only code was for the EGR and when I pulled the PCM, the electrolyte fluid from the failed capacitors had damaged the board beyond repair.
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bkampbel
1987 - 1996 F150 & Larger F-Series Trucks
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Oct 7, 2005 04:53 PM
