I have a 96 mustang 3.8l i bought it for 250 because of a blow head gasket. I got it all back together started it up to let it go through the heat cycle so i can torque it all back down...and it has a miss fire only in chamber 5. i replaced the coil and wires... then i replaced the spark plug and it still has the miss fire. is it possible that its compression or timing? haven't tighten everything down yet because i haven't let it go through a heat cycle BTW.
MISFIRE on a 96 3.8l
- Thread starter Moe Lester
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wmburns
SN Certified Technician
Check fuel injector
Check the fuel injector in cylinder #5. Test with a noid light to see if pulsing.
Replace or swap with another cylinder and see if the problem follows the fuel injector.
Check the fuel injector in cylinder #5. Test with a noid light to see if pulsing.
Replace or swap with another cylinder and see if the problem follows the fuel injector.
wmburns
SN Certified Technician
A noid light is a test light that will flash indicating 12 volts. A VOM meter does not always work because the pulse width is so short.
Suggest using a standard VOM meter to test for +12 volts on the RED wire and a known good ground (key on). This will prove basic power to the engine buss.
Next swap the injector with another cylinder and see if the misfire follows the injector.
Suggest using a standard VOM meter to test for +12 volts on the RED wire and a known good ground (key on). This will prove basic power to the engine buss.
Next swap the injector with another cylinder and see if the misfire follows the injector.
I would be checking compression on cyl#5, you may have damage to the head surface in that area. Compare it to the ones on the same bank.
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