Check engine light.
Yesterday I installed a set of E3 plugs along with the 160 T-stat and a couple of the wires got messed up when i pulled them off. Put the part that the plugs snap into back in them seemed to run fine and didn't throw any codes but noticed that it was ideling a lil rough today when in gear and stoped. Had new msd wires ordered and picked them up this evening and put them on right before dark and went for a test drive. It run alot better but when i pulled into the driveway the check engine light come on and went into reduce power mode. I new what had happend so i got out and poped the hood and the #5 plug wire came off the coil, put it back on and everything was fine after that but the light is still on. Would that be the reason for the light still being on? Sorry for the long post.
David,
2003 GMC Sierra Denali, LQ4, AWD, AWS, 4.10, Wheatley 93 tune, LT headers, GMPP CAI, BBK 80mm TB, MSD wires, E3 plugs, 160* T-stat, Flowmonster DI/DO, cutouts. Working on 4.8 heads, just purchased Comp 228R cam, 918 Springs, TI retainers, 7.4 hardend pushrods,
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