Rough Idle

[opfor2]

@opfor2 If you have an OBD tool you should be able to see which cylinders have misfires present and you can address those specifically

Would a misfire not set up a CEL?

 

[Dustin Jackson]

@opfor2 There might need to be a certain set of criteria to trigger a check engine light. I used to have a 96 tahoe 5.7 that ran terrible but had no check engine light, when I hooked it up I could see that one of the cylinders "misfire" count would go up under acceleration but never triggered a check engine light.

Could be different with this platform but I think someone would have corrected me by now, it's worth a shot?

 

[opfor2]

UPDATE: After many bottles of injector cleaner and numerous tanks of E85 fuel my rough idle was still present. So, I ended up buying 8 new OEM GM fuel injectors from Rock Auto and yes that was the issue. I've attached some pictures of the old injectors just so you can see what I was dealing with.

 

[iamdub]

UPDATE: After many bottles of injector cleaner and numerous tanks of E85 fuel my rough idle was still present. So, I ended up buying 8 new OEM GM fuel injectors from Rock Auto and yes that was the issue. I've attached some pictures of the old injectors just so you can see what I was dealing with.

Great and informative update!

 

[Tonyrodz]

UPDATE: After many bottles of injector cleaner and numerous tanks of E85 fuel my rough idle was still present. So, I ended up buying 8 new OEM GM fuel injectors from Rock Auto and yes that was the issue. I've attached some pictures of the old injectors just so you can see what I was dealing with.

What are these injectors rated at? Price?

 

[opfor2]

What are these injectors rated at? Price?

Rock Auto sold them for $69.79 each and they are Genuine GM Parts p/n#12613411. Not sure what the rating is but the same p/n as the old removed injectors.

 

[Fless]

An injector balance test may have shown the problem, but that's water under the bridge now.