Blowing a fuse, wont run

[gbizzle27]

For the past couple days the car hasn't been running because it keeps blowing the ignition coil fuse under the hood. The car would start alright, then after going it might studder, then run fine again. Finally it would die and i would find that the fuse was blown. When trying to restart the tach read fine but it would have a lot of trouble. Sometimes it would restart, other times it wouldn't. What could be the problem?

 

[SHOZ123]

Isn't that a symptom of the coolant level sensor shorting out? Try unhooking the sensor and see what happens.

 

[projectSHO89]

Isn't that a symptom of the coolant level sensor shorting out? Try unhooking the sensor and see what happens.

Yep, that's the usual suspect provided the car is an ATX.

Other, more distant choice, is a shorted RFI cap.

Steve

 

[gbizzle27]

I just went and ran the codes, i got 114 and 116...IAC sensor and Coolant Level sensor. So you guys think that they could have had something to do with the problems?

 

[projectSHO89]

I just went and ran the codes, i got 114 and 116...IAC sensor and Coolant Level sensor. So you guys think that they could have had something to do with the problems?

Absolutely not. Those two codes are caused by 1) a cold engine and 2) ambient air temp below 50F.

A note: The coolant level sensor is this fuse on both versions of the SHO, my earlier post was from memory and upon looking at the drawing, overlooked that the MTX also has this quirk.

Check it first (just disconnect the sensor at the overflow tank).

If the fuse still blows, disconnect the RFI cap at the coil and retest.

Steve

 

[hawkeye18]

I always thought it was just the automatics that had that problem. One of my old parts cars did that - blow the IGN COIL fuse when the overflow tank sensor shorted. Seems like a pretty stupid design flaw on Ford's part. That doesn't seem to happen all that often, though; they seem to open up far more often than short out, and most that I've seen simply don't work. I'm glad to say that the sensor on my DD 94 works just fine, though!