Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
2004 Tahoe z71 z flex fuel. Cant seem to be able to copy and paste all info here but have added screen shots.
P0300 is only code.
Tested all the usual stuff again would post results but copy and paste not working.
Were there any history miss counts on cylinder #7 or #8? If not, it sure looks like #5 is the main offender. Does the #5 Current counter tick up at idle, or while driving?
Clear flood test... Hold accelerator to floor while cranking engine. Listen to rythem of starter motor. Should be consistent rem rem rem starter sound. Any hick ups tells you one or more cylinders has a problem.
"an open mind let's knowledge flow in and wisdom flow out for a man who has neither never listens to those who have both".
Being wrong doesn't bother me, it's being right and not understanding why that does
i swapped plug 8 with plug 2. no scanner says misfire is in cylinder 1/6 WTH? will try the flood crank now.......cranks normal no odd ups or downs
BTW it starts on the 3 rotation
Hmmm. Has to be oil then. Compression on #8 looks Ok, but if oil is in the cylinder you will get a high compression rate as a posed to a dry cylinder. Does the pressure bleed off?
Put your thumb over plug hole and crank. Can you tell now if oil or ?
"an open mind let's knowledge flow in and wisdom flow out for a man who has neither never listens to those who have both".
Being wrong doesn't bother me, it's being right and not understanding why that does
