Detonation!

[millamills14]

Hey guys new here, any help would be great!! 2005 GMC Seirra 1500 5.3

 

Driving, noticed my idle shit the bed at stop lights.... check engine light came on and flashed at me, so i know thats very bad. checked codes, lean on bank 1 and 2, also multiple cylinder misfire.... hooked up my little scanner that can show live data

 

Short term fuel trim bank 1 and 2 99.2%!!!!

 

MAF at idle. 0.01V

 

also its dumping mad fuel can smell it bad out of the exhaust.

 

WTF! lol

[Chris]

Maf could be dont, o2 sensors could be gone, cats dead, a lot of things can cause it. Miles on the truck? Time for a tune up maybe?

[millamills14]

rear 02 sensors shouldnt have anything to do with anything besides checking cat efficency, and i already have new cats as well. truck has about 125k

[Chris]

Front sensors can change things.

[millamills14]

but you think i would have gotten a code if they were screwing up THAT bad.

[Chris]

Something is causing leans and misfires

[millamills14]

obviously, lol thats why i am here,

[millamills14]

Also to state. It's the rear 02 both banks reading 99% short term fuel trim. Actual fuel trim is normal.

[Chris]

What I'm saying is there can be a lot of factors to cause this. At 100k were the plugs and wires taken care of?

[millamills14]

Found it. Driver upstream 02 shorted.

[txab]

Found it. Driver upstream 02 shorted.

 

 

Well, imagine that!

[h2ofwlr]

By the title I thought this topic was going top be about the G80 limited slip "grenade" differential blowing up!

[02suburbanZ71]

By the title I thought this topic was going top be about the G80 limited slip "grenade" differential blowing up!

X2