Join Date: Jun 2011
krazii is offline
Re: 2000 Blazer. rough idle, misfires, i have tech 2 diag info
okay, did more work today, only cylinder 5 was misfiring, i drove the truck home today and boy was it dogging, no power, just putt-ing along. died a few times, I got flipped off and cursed at two times. heh....got it to the house shut it off and experienced what i think is called pre-ignition the truck ran for about 3 seconds the key was turned off. then it finally quit. pulled the #5 spark plug, plug was black with a think coat of soot. Thing wont idle smoothly for nothing, after messing with it for awhile and trying to rev it... it miraculously had power, thank god.... no mechanical problems... (had a knocking sound but pretty sure it is the tensioner and/or detnotion because of the misfire) held 3k rpm good with the sound of power and a slight misfire out of 6 but a lot healthier sounding....drop back to idle, barely idled again, revved up to 3k... power again.. plugged the tech 2 in.... at idle cylinder 5 constant misfire, rev up, misfire stops at cylinder 5 and cylinder 6 starts to slowly chime in with a misfire. I called a friend that used to work for a Chevy dealer and he said the poppets are more than likely obstructed and I should pull the intake off, hook the fuel and return lines back up, and pull the poppets and do an injector test with the tech 2 and use a dental pick to clean the poppets that are plugged... and most of the time you don't need new injectors its the poppets that get plugged. he said that the 10% ethanol in the gas we run now breaks the rubber down in time and forms a rubber gunk that gunks up the poppets leading them to malfunction..
does this sound about right? anyone have any input on the diagnose? I also forgot to tell my friend about the pre-ignition/running after the key was pulled although that was the only time it did that. I have a few readings off the tech 2 listed below if they help????
TPS GOOD FROM 0 - 100%
BARO: 4.85V / :101KPA CONSTANT
MAF :6 - :21 G/S APPROX RANGE WITH REVS
KS ACTIVITY :64 - :240 APPROX RANGE WITH REVS
CMP CORD :-6 DEGREES STEADY (THINK THE WIFE WROTE IT DOWN AND WAS COMP NOT SURE)
SPARK CONTROL: ADVANCE
AIR FUEL: 14.7:1
IAT 127 DEGREES FARENHEIGHT
EVAP CANISTER PURGE :ON :5% DUTY CYCLE
POWER ENRICHMENT: INACTIVE