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Help please!!

DINGDANG

By DINGDANG
in Troubleshooting & Recalls

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DINGDANG Enthusiast

DINGDANG

Posted
Posted

Back story- 2014 silverado 4.3l v6 60,000 miles. Devloped a misfire waiting in line to get oil changed took to part store and they told me that I had a misfire on cylinder 2. Changed plugs and wires on all 6 cylinders and still had misfire. Took back to parts store and because the check engine light was on and they told me fuel injectors so changed all if the injectors and intake gaskets. still have misfire, had compression check and it was good also done fuel pressure check and getting good fuel pressure. I'm not really sure what to do next the only option left on the ignition system is to change the coils, but don't wanna waste $ if I don't have to.

  • 2 weeks later...
DINGDANG Enthusiast

DINGDANG

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Replaced all 6 coil packs and still missing, not sure what to do next!

DINGDANG Enthusiast

DINGDANG

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Posted (edited)

Really wasn't sure what to do next so I just bought all 6 coil packs and changed them. drove it around and the misfire would happen intermittent and service engine light would come on and a few times the traction control light came on as well. Beginning to wonder if it's an issue with the active fuel management?

Edited by DINGDANG
DINGDANG Enthusiast

DINGDANG

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 Engine has a slight miss at idle, stumbling abit and the rpm will jump as well

txab Senior Enthusiast

txab

Posted
Posted (edited)

Post your fuel pressure readings. Also since you're doing everything else it seems, clean throttle body and MAF

Edited by txab
DINGDANG Enthusiast

DINGDANG

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On 5/8/2022 at 12:53 PM, txab said:

Post your fuel pressure readings. Also since you're doing everything else it seems, clean throttle body and MAF

Cleaned throttle body and maf sensor. now the coolant fans are running constant, not sure if they are related. No engine light but still a small hiccup when idling. Drove a few minutes drives good but the fans are running. Engine is running Normal temperatue also.

DINGDANG Enthusiast

DINGDANG

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2 hours ago, DINGDANG said:

Cleaned throttle body and maf sensor. now the coolant fans are running constant, not sure if they are related. No engine light but still a small hiccup when idling. Drove a few minutes drives good but the fans are running. Engine is running Normal temperatue also.

Will have to to fuel pressure again, don't have the fuel pressure gage anymore. Buddy done it for me.

txab Senior Enthusiast

txab

Posted
Posted

You don't remember the FP readings? Need to check them against the recommended spec.

 

So engine is running now with no miss? Or it just hasn't had time to show up? Did you disconnect battery while doing cleaning and use the proper cleaning agent?

 

16LT4 Enthusiast

16LT4

Posted
Posted

Wrong plugs, or go overboard with antiseize?

 

If the CEL was on, the DME has stored trouble codes.  What are they?

DINGDANG Enthusiast

DINGDANG

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3 hours ago, 16LT4 said:

Wrong plugs, or go overboard with antiseize?

 

If the CEL was on, the DME has stored trouble codes.  What are they?

Will check it out, went out to start it today and the battery is dead

  • 1 month later...
DINGDANG Enthusiast

DINGDANG

Posted
  • Author
Posted

Ran crc intake and valve cleaner, still missing, cel came on and stayed on. Took truck auto parts store and reader said misfire on cylinder 5. Took out spark plug out and it was broken, changed it and the misfire went away and the truck is running good now. Looking into buying afm disabler to turn it off.

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