Misfire cylinder #4

[badtothe bone]

The technical service bulletin tells you to change all 8 injectors with the new revised style injectors and not to try to replace just one.

If you have a problem with one, chances are the other ones are not far behind.

It is not that the injector is not squirting, it is that it is not squirting the right way, ( it's what you would call a leaky injector ) sometimes they actually dribble out the fuel and it is like trying to dump gasoline down a carburetor, you can get it to run good enough to keep it running, but you wouldn't want to drive it any distance that way.

Once a vehicle starts to move down the road and desires more fuel, it doesn't matter how it gets into the cylinders, it will pretty much burn anything you give it.

Sea foam is not a cure all for engine woe's.

In the long run the person who replaced the spark plugs, wires and coil would have been better off to have just took it to a mechanic the first time and not had to pay all the extra money - just to find out that it was not the problem.

A 02' Avalanche I had, we ran Kerosene in it lot's of times and all sorts of stuff, but never fuel injector cleaners and even after 150,000 miles, it still had the original injectors and never had a problem with the injectors.
Sometimes it will cause more problems then it will solve.

 

[03_Denali]

It sounds like a bad injector to me. Usually when a cat goes bad, an entire bank, or both, will show misfire. Change the injector and see where you are, they are easy enough to change.

 

[92__silverado]

I am going to be replacing my plugs and wires soon then getting the code cleared to see if it comes back. I am hoping it is not the injectors. I think when i looked them up they were somewhere around 80 dollars a piece. That could get expensive fast.

 

[rigo_jones]

i had this and after i changed the spark-plugs 2 were broken. who ever put them in broke two and left them. to day it was 0* cold and i started the engine and it turned off after 2 seconds, i turned it on and it kept running but with rough idle but no check engine light. might be injectors ill just wait for my 6.0 swap rather than spending like $500 on injectors pus i got the flex fuel thing so might even be more expensive. btw i sea foamed this ***** already...

 

[92__silverado]

The injectors are 92.00 front Autozone and $74.28 from Gm parts direct. Damn. I do not want to go that route.

 

[rigo_jones]

The injectors are 92.00 front Autozone and $74.28 from Gm parts direct. Damn. I do not want to go that route.

each or set? i saw an auction on ebay for 8 new injectors for $1200

 

[BOSS]

It sounds like a bad injector to me. Usually when a cat goes bad, an entire bank, or both, will show misfire. Change the injector and see where you are, they are easy enough to change.

Yup. He's getting multiple misfires...like I said, older truck and it might be the bank2 cat or upstream o2.

How did the #4 plug look compared to the others?

Might also want to do a fuel pressure test

B

 

[92__silverado]

each or set? i saw an auction on ebay for 8 new injectors for $1200

Each.

 

[YukonCO]

All good info - may be more in depth than my mechanical skills. I may have to take to a mechanic and see if he can isolate it for me and determine what I am looking at for costs - Just trying to eliminate some of the easier/cheaper finds prior to going to a mechanic. May look at how difficult it is to change an injector!

 

[03_Denali]

Injectors are super easy to change! 2 bolts for each fuel rail and a small torx tip is needed for the cross over tube.