Blowing pcm fuse

[NoSvtCorbett]

I’ve read some discussions about people blowing the pcm fuse but they don’t seem to have my problems so I’m seeing what everyone thinks. I recently changed my intercooler under the supercharger. I drove the car to work the next day and it drove fine that morning about 25 miles to work. That afternoon I drove it 15 miles back into town on my way home. I did a few pulls in the car on the way home. After the last pull I blew the pcm fuse in the car. I looked into some chats on here where people were chasing the problems. I’ve ruled shorts out and changed my ccrm in the car and still blowing it. I can crank the car and it idles fine and rev it just sitting still. Pull out the drive way and put a small load on it and it blows the fuse. Any ideas? Guess I’m going to order a pump next.. car has 93,000 miles


D3_cobra

 

[procharger]

Use a handheld to get live data on your fuel pressure.

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[procharger]

Double check all wiring around supercharger, sounds like once the metal expands it create a short, but it can only happen when its hot.

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[NoSvtCorbett]

I’ve triple checked all my wiring. Thought about injectors or the fuel pressure sensor or the rail sense I had it all off changing my intercooler. Just wish I could pinpoint it without buying one thing at a time. I’m sure it all needs to be done anyway with high mileage, it’s just getting under my skin that I can’t find the problem


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[MalcolmV8]

Your ECU has built in injector and ignition drivers. Possible an injector or coil is failing or shorting and pulling to much current blowing the fuse.

 

[hotcobra03]

what exact fuse number are you blowing?

when you did work..did you pull complete lower intake as a unit?

 

[MG0h3]

Your ECU has built in injector and ignition drivers. Possible an injector or coil is failing or shorting and pulling to much current blowing the fuse.

Sounds like a good theory.

Could also be when the engine torques over a wire you that was exposed after your work is shorting.

Either way, in my experience if a problem starts right after I did work it was my fault. I'd check the harness/connections that you disturbed.

 

[NoSvtCorbett]

Ive changed my frpm and ccrm now and car isn’t dying but I think I’ve got a vacuum leak of some sort. I’m trying to defuse that situation but nothing is throwing a code. If there was a leak, would it not throw a code? I took my lower intake off too when I had the supercharger off, I was changing the intercooler in it. Needless to say it’s some odds and ends but I’ll get them figured out. I just got the car a month ago pretty cheap


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[MalcolmV8]

Depending on the tune and how far things are off it may not throw a code. With the car fully warmed and idling try squirting some carb cleaner around the areas you suspect a vacuum leak. You'll hear the idle speed change confirming a leak.