EEC Fuse Keeps Blowing - Need Advice

94mustangsvt

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This morning I went to start my car, and I noticed the fuel pump didn't come on. I pulled the engine fuse box cover, and the 20 amp fuse for the EEC (fifth slot from the left on the top row) blew. I put in a new fuse and it started up, and I drove it to my office.

However, when I was starting it to come home it blew the fuse as soon as I put the key in the accessory position. I tried two more 20 amp fuses, but it blew both of those just the same. I've had a check engine light for a while, and the car was randomly cutting out for brief moments once warm, but I didn't have a chance to check the codes.

Any suggestions on what it could be? I'm wondering if it is the CCRM. Thanks.
 

CC'S95GT

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The CCRM is a possibility. It has the FP relay inside. Could be the FP itself. or the ignition SW too
 

ttocs

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my mustang wiring bible ways it powers the pcm and ccrm. I would start simple by disconnecting the harness that goes to them and inspecting it for corrosion on either side.
 

95opal

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You have a direct short that's blowing the fuse, stop replacing parts and track down the short
 
OP
OP
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94mustangsvt

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You have a direct short that's blowing the fuse, stop replacing parts and track down the short

This ended up being the problem. I had it diagnosed at a shop then fixed it myself. The #7 injector wires were getting smashed under the Trick Flow upper intake manifold and caused an open wire. I didn't realize there was a clearance problem there until now, especially, with the 3/8" spacer. Anyways, pulled the upper off, put electrical tape on the wires, rotated the injector, and it runs great again.
 

CC'S95GT

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Good find. glad your back up and running. Now fix the bare wire the right way or it'll be back.
 

95opal

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Had you mentioned an intake swap I would have suggested looking at the injector harness and could have saved ya a few dollars. Next time you come upon a problem let us know what you did leading up to the prolem so we can better help you. Otherwise its a crap shoot.
 

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