[86f350]

Got an 02 that will crank no problem very strong but will not start. But if i leave the key in the on position for about 5-10 min when i try to crank it immediately starts. Once its on it runs 100% fine as long as i don't shut it off. If i turn the key off i have to wait again. If i remove fuel pump relay while its running it will stall, when i put it back in it will immediately start. The theft light is not flashing and the odometer is displaying mileage. I've tried wiggling the crank sensor wires both while running and while cranking with no difference. Anyone have any other ideas on what to check? Seems like its only when the ignition is turned to off that it doesn't want to restart. I've also tried swapping various relays with no results.

 

[Leeproctor83]

Any codes?

 

[86f350]

no codes and have tried both keys

 

[XBMX]

Years ago had the factory alarm system fail, same type issues. Dealer had to order relay or somerhing. Not solely a Lightning issue.

 

[chesster51]

Got an 02 that will crank no problem very strong but will not start. But if i leave the key in the on position for about 5-10 min when i try to crank it immediately starts. Once its on it runs 100% fine as long as i don't shut it off. If i turn the key off i have to wait again. If i remove fuel pump relay while its running it will stall, when i put it back in it will immediately start. The theft light is not flashing and the odometer is displaying mileage. I've tried wiggling the crank sensor wires both while running and while cranking with no difference. Anyone have any other ideas on what to check? Seems like its only when the ignition is turned to off that it doesn't want to restart. I've also tried swapping various relays with no results.

When through this exact same thing last year. Replaced fuel pumps, crank sensor and a few other things. Finally gave up and had it towed to a shop and it turned out to be the PCM. Replaced it and loaded the stock and custom tunes on it and all was good. I've since sold the truck but it 's still running strong.

 

[86f350]

yup have the pcm out now getting repaired. Waiting to hear

 

[arod76801]

Having same issue, was it the PCM?

 

[arod76801]

yup have the pcm out now getting repaired. Waiting to hear

yup have the pcm out now getting repaired. Waiting to hear

Was PCM the problem?

 

[redstreak]

Any update on this? Having a similar issue

 

[arod76801]

Any update on this? Having a similar issue

2004, I replaced the pcm relay underneath dash on driver side and it fixed my problem.

 

[4rd Performance]

2004, I replaced the pcm relay underneath dash on driver side and it fixed my problem.

Could you post a pic where to look at exactly?

I opened my driver's side door & stuck my head under the dashboard by the pedals.... I don't see any "relays" jumping-out at me... or do I have to drop the bottom panel below