94 F-150 engine dies when...
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Joined: Nov 2006
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94 F-150 engine dies when...
Hey all, I have a 1994 F-150. Rebuilt the engine 2yrs ago. A problem popped up one day when I started to turn on the heater. I smelled a burny electric smell and the engine stuttered and died. I turned everything off and the engine started right up but now everytime I try to use the Ac or heat the engine shutters and dies. Otherwise it runs fine. I took the blower motor out today thinking that might be the problem but when the heat or ac is turned on it still shutters and dies. Could the compressor be locked up or some thing. Or is it something else. Please help. Any suggestions?
Senior User
Joined: Sep 2004
Posts: 140
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From: coldest place in hell
Check for a short to ground. Also look at altenator.
Somewhere something is shorting ( most likely the heater blower switch or resistor) whether or not it is dash ( meanning the heater blower switch/ac) or motor which you tested amp draw correct?
If compressor locked up, (which I doubt due to electric burn smell and not rubber), you would not be able to make it spin by hand freely. Meanning it will require alot of effort to get it to turn. If you can "flip" the pulley so it spins and does so smoothly and freely then no the compressor is not the problem and electronice are.
I know this sounds like a circle jerk but best I can give you.
Somewhere something is shorting ( most likely the heater blower switch or resistor) whether or not it is dash ( meanning the heater blower switch/ac) or motor which you tested amp draw correct?
If compressor locked up, (which I doubt due to electric burn smell and not rubber), you would not be able to make it spin by hand freely. Meanning it will require alot of effort to get it to turn. If you can "flip" the pulley so it spins and does so smoothly and freely then no the compressor is not the problem and electronice are.
I know this sounds like a circle jerk but best I can give you.
Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
Hi, I had a similar problem you explained, but mine came from the headlight switch, everytime I went to use it in my '90 F-150 I6 300, she would cough, sputter, die, and fire up again. Sounds like a definate circuit problem. My wiring harness that plugs into the headlight switch adapter had melted and shorted out.
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