REALLY bad misfire
January 5th, 2013, 11:05 AM
#1
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REALLY bad misfire
Hey guys I'm in need of some help. my 99 silverado 5.3 has developed a terrible missfire. The truck is barely drivable right now. I scanned the ses light and got P0101,P0300,P0332,P0420. I replaced the plugs and wires and it seems to have made no difference at all. I don't want to continue wasting money on parts I don't need. So if you guys have any input on things to check that would be great!
Thanks,
Matt
Thanks,
Matt
January 5th, 2013, 1:11 PM
#2
What I do is clear the codes, drive the truck, then scan 'em again to rule out any old history.
That aside, rule of thumb is to start at the lowest code first; in your case, the MAF. Also, as it is the common denominator to your additional random misfire, knock sensor and converter codes.
Allan
That aside, rule of thumb is to start at the lowest code first; in your case, the MAF. Also, as it is the common denominator to your additional random misfire, knock sensor and converter codes.
Allan
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