Definite misfires: strange behaviour. help!
02-22-2003, 10:51 AM
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Definite misfires: strange behaviour. help!
Ok, so I've been trying to diagnose why I get intermittent thumps in my
exhaust.
Today, I put my timing light to all 4 ignition wires, and found that 1 and 4
do not get spark once in awhile. Sometimes, #1 would miss for a few revs, then
I'd hear pop in the exhaust.. #4 doesn't miss as frequently. #2 and #3
don't miss at all (or barely noticeable).
Anyway, I'm guessing the thumps are caused by series of misfires, afterwhich,
fuel in the exhaust ignite.
Funny thing is that when I pop the hood, and when the engine bay cools down,
the misfires go away. Does igniter performance degrade with heatsoak?
exhaust.
Today, I put my timing light to all 4 ignition wires, and found that 1 and 4
do not get spark once in awhile. Sometimes, #1 would miss for a few revs, then
I'd hear pop in the exhaust.. #4 doesn't miss as frequently. #2 and #3
don't miss at all (or barely noticeable).
Anyway, I'm guessing the thumps are caused by series of misfires, afterwhich,
fuel in the exhaust ignite.
Funny thing is that when I pop the hood, and when the engine bay cools down,
the misfires go away. Does igniter performance degrade with heatsoak?
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