Rough Idle

[Marky Dissod]

More I read about E85, more I learn about how it burns cleaner.

Why not start with two bottles of Chevron with TechRon Fuel System Cleaner?
Should be able to buy that at your local automotive store.
Add that to E85, should clean things up pretty well.

 

[opfor2]

More I read about E85, more I learn about how it burns cleaner.

Why not start with two bottles of Chevron with TechRon Fuel System Cleaner?
Should be able to buy that at your local automotive store.
Add that to E85, should clean things up pretty well.

Is it compatible with E85?

 

[Fless]

I'd do just the E85 for a few tanks and see what happens. It's a good fuel injector / fuel system cleaner all by itself.

 

[iamdub]

I'd do just the E85 for a few tanks and see what happens. It's a good fuel injector / fuel system cleaner all by itself.

This.

Also, Berryman B12 > Sea Foam any day.

 

[Marky Dissod]

Is Chevron with TechRon Fuel System Cleaner compatible with E85?

Would not have suggested it if it was not.
Yes it's compatible with E85; read the bottle.

... Berryman B12 > Sea Foam any day.

I agree wholeheartedly.

 

[opfor2]

Update: So after running exclusively E85 fuel and 4 bottles of injector cleaner the rig seems to idle a little better however, the roughness is still present. I'm thinking that I may have one or more injectors what need additional cleaning or replacement. My question is how does one determine which injector is dirty without removing them all?

 

[mikez71]

Sparkplugs? Recently saw a thread about a bad sparkplug. If nothing else you can see if any look lean (white).

I'm not sure you will be able to see if injectors are clogged, but there are injector cleaning/flow rate testing services..

 

[opfor2]

Sparkplugs? Recently saw a thread about a bad sparkplug. If nothing else you can see if any look lean (white).

I'm not sure you will be able to see if injectors are clogged, but there are injector cleaning/flow rate testing services..

Yes I replaced both the plugs and wires with OEM AC Delco parts

 

[j91z28d1]

Update: So after running exclusively E85 fuel and 4 bottles of injector cleaner the rig seems to idle a little better however, the roughness is still present. I'm thinking that I may have one or more injectors what need additional cleaning or replacement. My question is how does one determine which injector is dirty without removing them all?

usually the fuel rail has to come off to get 1 injector out, so at that point it's just pulling all 8 out of the rail and then there's a injector cleaner, it's a sonic bath while opening them up and then flow testing them. might be a shop local to you. but most people mail them off. no clue on costs these days, you can probably buy new good quality aftermarket injector for the price but there's a setting in the tune that should be adjusted to the new injectors. offset times for opening and closing vs ign voltage I believe it is. every brand is different and most good ones will provide it. but that opens a whole can of worms if not tuned. so for a daily it's normally easier to just have the stock ones cleaned and flow tested.

 

[Dustin Jackson]

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

 

[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.