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Old 12-24-2011, 06:54 AM
poy41 poy41 is offline
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2007 silverado misfire (no codes)

Hello all,

I have a 2007 (classic) siverado with a 4.3L and 57,000 km. I just finnished installing an amp for a 12inch sub and notice under heavy bass the head lights dimmed a dit, this is understandable as its a heavy load. So I reved the engine a bit (1800rpm) to help out the system with charging. then the check engine light started flashing. turned off the engine and back on, light was off. did the same thing, only the volume a little lower and no RPM and the light started flashing again, then when off in about 1 minute. took it for a 10km drive, stoped, accelerated, engine off/on, highway speeds, everything seems fine. ODB2 scaner shows no codes. Aslo, had to disconect the battery to hook up the amp and all this happen right after. (everything is tight on the batt.)

any ideas?

was thinking:
-'low voltage' problem.
-old spark plugs.
-bad grounds.
-bad battery

thanx for any help
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