p0353 p0354 p0355 and p0357 all came up
09-24-2010, 04:01 PM
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p0353 p0354 p0355 and p0357 all came up im getting all these codes. it is running slightly rougher, it is noticeable if i bring the rpms up and hold them there, it will pop and stutter a little. none of the plug wires are touching anything, and are in good shape. i couldn't imagine all these coils going bad at once, what else could it be?
09-24-2010, 07:42 PM
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guess I should have added this... It's a turbo 5.3l running in speed density, I have about 10,000 miles on this motor, not sure how many were on it before. I've used the coils for at least 25,000 miles and not sure how much use before I owned them. msd wires aren't old at all and tr6 plugs have been in for prob 5k miles. I don't run more than 12 lbs of boost about 7 on a usual basis. I've checked connections and all is well there.
09-24-2010, 09:21 PM
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well looking at the coils that are acting up, i would check your ignition module if you have one. I don't remember if the LM7s have ignition modules or not, if not it could be your PCM. Since its a swapped motor, i would check ALL wires, not just spark plug wires, any little puncture can cause a wire to ground out.
09-24-2010, 11:03 PM
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Yea I briefly checked over the wiring but the loom isn't melted and it isn't pinched or anything... what causes these to go bad, and how common/ what are the chances of that actually being it... I'm going to swap the coils from another motor I have, so I guess I'll find out tomorrow.
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10-11-2010, 07:03 PM
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loose connector from main harness to the coil pack harness the female pins got loose after time. my buddy (a GM tech) came over took a pic and bent them down. so far so good no more missfire or codes hope this helps someone out there
