Truck wont start.......PCM Fuse
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Joined: Mar 2009
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From: Fairbanks, Alaska
Truck wont start.......PCM Fuse
I started this on the electrical fourm but it was brought to my attention that this was the appropriate fourm for this post....
1997 Ford F150 6 cyl Four Wheel Drive Manual 114000 miles
I have recently tried to get my truck running again.
It wont start and thought it was my fuel pump. I did some tests and found out it was not my fuel pump it was that my fuel pump wasnt getting power nor was i getting spark. I then checked my fuses and my PCM fuse#24(engine) was blown, I replaced it and when i did my fuel pump started spewing fuel and i had spark. The truck started right up but went 10 ft and blew another fuse. now I am stuck with a PCM 30amp fuse that blows every time i try to start the truck. It did start the first time and ran for 5 mins and blew the fuse. Since then i havent been able to even start it before the fuse blows. It even blows a 40amp fuse. I am not sure how the PCM works or what could be causing it to blow.
I just pulled my spark plugs and they were in bad shape I had 2 broken plugs and they all had a 100 thousand gap(double what they were suposed to have). I heard that if my coil pack was bad it could blow my PCM fuse. Could this be the problem?
Update....
I have looked at 2 things that could be the problem. 1) a fuel pump short that is causing my PCM fuse #24 to blow. 2) My coil pack causing it to blow the fuse. I isolated the PCM fuse#24 by taking out the fuse for the fuel pump#19 (under hood) and the fuse for ignition coil and pcm relay#30 (under dash). I then tried to start, PCM fuse was still good. I then returned the fuel pump fuse#19 and tried to start, PCM fuse was still good. Then I returned the ignition coil and pcm relay fuse#30 and tried to start, the PCM fuse blew imediatly!! I know this narrows it down but does it pin point the problem? Is my next step to replace the coil pack?
Thanks for your input
Also any links for Diagrams very helpful
1997 Ford F150 6 cyl Four Wheel Drive Manual 114000 miles
I have recently tried to get my truck running again.
It wont start and thought it was my fuel pump. I did some tests and found out it was not my fuel pump it was that my fuel pump wasnt getting power nor was i getting spark. I then checked my fuses and my PCM fuse#24(engine) was blown, I replaced it and when i did my fuel pump started spewing fuel and i had spark. The truck started right up but went 10 ft and blew another fuse. now I am stuck with a PCM 30amp fuse that blows every time i try to start the truck. It did start the first time and ran for 5 mins and blew the fuse. Since then i havent been able to even start it before the fuse blows. It even blows a 40amp fuse. I am not sure how the PCM works or what could be causing it to blow.
I just pulled my spark plugs and they were in bad shape I had 2 broken plugs and they all had a 100 thousand gap(double what they were suposed to have). I heard that if my coil pack was bad it could blow my PCM fuse. Could this be the problem?
Update....
I have looked at 2 things that could be the problem. 1) a fuel pump short that is causing my PCM fuse #24 to blow. 2) My coil pack causing it to blow the fuse. I isolated the PCM fuse#24 by taking out the fuse for the fuel pump#19 (under hood) and the fuse for ignition coil and pcm relay#30 (under dash). I then tried to start, PCM fuse was still good. I then returned the fuel pump fuse#19 and tried to start, PCM fuse was still good. Then I returned the ignition coil and pcm relay fuse#30 and tried to start, the PCM fuse blew imediatly!! I know this narrows it down but does it pin point the problem? Is my next step to replace the coil pack?
Thanks for your input
Also any links for Diagrams very helpful