Some friends of mine posted this on another board...
Machine:
..for my 91 4-banger to shut itself down if there is an exhaust buildup?
See, the problem is that she shuts down arbitrarily sometimes for no apparent reason. She also bogs down (sluggish) after driving for a while. When she shuts down, she will not start back up unless I let her sit for a few hours (wtf?) For instance, she died on the drive home yesterday, and when I went out this morning, she started right up (and ran better than ever, too)
I hve checked the wiring, modules, sparks and wires, replaced the battery, changed the o rings on the injectors, etc. and she still has this problem.
I have been told that it's probably my convertor is clogged up somehow and the exhaust is building up. she does get very hot sometimes and I do get a gas/exhaust smell after driving her for a while, plus I get puffs of grey smoke sometimes when I'm driving
Could this be the problem?
GT40-PTech:
I had the same kinda problem on my 88GT, it was the FUEL PUMP causing "VAPOR LOCK" . Does it die while running or idling ? Also does it miss any right before it dies ? If so then it is your fuel pump. It can also be the pickup in the coil. Yes, I know that I am saying the SAME thing from your 88 problem, but Mustangs are so predictable
03mach1
Check your cats if equipped. When they get hot they expand and plug, especially if there orginal. Had the same problem with my 91 Chevy pickup
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