missfire ls7 = ( help!!
09-30-2010, 07:05 PM
#1
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missfire ls7 = ( help!! all of a sudden got a missfire on a 70 chevelle ls7
power to coils ok
grounds ok
new spark wires
new plugs
fuel pressure ok
cam sensor new
anyone ?
power to coils ok
grounds ok
new spark wires
new plugs
fuel pressure ok
cam sensor new
anyone ?
09-30-2010, 09:56 PM
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I was getting misfires on my ls2 from misgapped plugs. I switched to MSD wires which require a larger plug gap and didnt know it. It was causing misfires like crazy.
10-01-2010, 09:35 AM
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i dont have that option with my scanner (solus) at least i dont see it
i checked into the injector wiring ,it looks ok,it seems like the ecm may be bad ?
i checked into the injector wiring ,it looks ok,it seems like the ecm may be bad ?
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10-03-2010, 10:43 PM
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Have you checked the compression rate if all sylinders are the same? if the compression is all the same and electric everything is in order you may have a valve train proplem, so you may need to got the sylinders head out.
10-03-2010, 11:19 PM
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oh by the way ,its cylinder # 3 and the plug looks brand new still ,i pulled the fuel rail and injector sprays ,when i tested the injector signal with the snap on vantage it wouldnt get a signal,car isnt mine ,its my friend`s car ,it wass tuned by synergy ,it has an aftermarket cam too so i have no real detail on what was done other than the car was running ok and all of a sudden it started missfiring driving @ 10-20mph ...that night i didnt have my compression gauge tester so i was unable to check for compression even thought it didnt have a sound that was weird
