Originally Posted by rnmaxima
if it is the coil packs you'll get a misfire code and the knock sensor will show a code as well.....move coil packs around to see if the misfire follows the change in cylinder....
If the coilpack is 100% bad, then yes chances are you'll get a CEL. If the coilpack is still working, but dying (failing at WOT for example), a CEL may not come up. I know this from experience, take it FWIW.
And just to clarify, the KS may throw a code, but it does NOT trigger a CEL, ever. The user has to check for the KS code manually.
Mr. Duck, although you don't have a CEL, did you check for codes anyway? (for the KS code)
When is the last time you checked/replaced the spark plugs?
Is your Max a '99 by chance?
My hunch says spark plugs, coilpacks, injectors, or MAF.