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eng. pinging

Va2500HD

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Va2500HD Enthusiast

Va2500HD

Posted
Posted

Looking for some help. I have had engine pinging for the last several hundred miles and several refuelings. Engine pings at start up acceleration and at speed accelerating. I had been running 87 oct with no problems and have tried mid and high grade with no fix. Coincidence or not it all started after Katrina. No DIC message. No noticeable loss in mpg's. It's driving me crazy. Any help? 2002 Chevy 2500HD 6.0.

Shaners Senior Enthusiast

Shaners

Posted
Posted

Welcome to the forum!

 

It could be several different things ranging from fuel blends to a possible sensor going bad. Maybe just a dirty MAF sensor.

 

Have you thrown a check engine or service engine soon light?

 

I bought gas in my old 6.0L around Washington DC once (oxygenated fuel), and it ran and sounded like crap until I got that gas run out of it...

Haulin' 8.1 Enthusiast

Haulin' 8.1

Posted
Posted

Use brake cleaner on a removed and unplugged MAF. Make sure it is completely dry before reinstalling it. You need to spray off the small sensor elements hanging inside the tube.

 

Other things that will cause this: low fuel pressure (clogged filter), restricted exhaust, high engine temperature, vacuum leaks, dirty air filter, wrong spark plugs,

 

Vernon

Va2500HD Enthusiast

Va2500HD

Posted
  • Author
Posted

OK, thanks for the input. I also went back through some old posts on this problem. Engine temp is good, filter was cleaned not too long ago (K&N, I know), fuel filter has been changed. Sounds like maybe the maf or O2 sensors. Where exactly are these? Any pictures?

Shaners Senior Enthusiast

Shaners

Posted
Posted

The MAF is directly after the airbox on the air intake runner. The clean air passes through it on the way to the engine. It is a delicate screen with a sensor in it.

Rylandnc Enthusiast

Rylandnc

Posted
Posted

My 2001 2500 with the 6.0 woud ping also when running 87 octane. I switched to 93 octane and the pinging went away but have to clean the throttle body about every 6,000 miles. I'm back to 87 octane and ran a can of Seafoam in the tank and the pinging is gone and even idles smoother. It will be interesting to see how long it lasts.

  • 2 weeks later...
2001 HD Enthusiast

2001 HD

Posted
Posted

Don't forget about the TSB on the corrioded knock sensor terminals. Did you wash your engine after the storm? Was your truck submerged in water?

 

:flag:

mmmikkke Senior Enthusiast

mmmikkke

Posted
Posted

If you replace all that stuff and it's still pinging, try this no-cost diagnostic tool: Take out each plug and look at it. Keep track of which plug came from which cylinder. You might only have one cylinder that's preigniting. It's plug will look different.

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