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Pinging when engine hot - any way to eliminate?

JeffP

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JeffP Enthusiast

JeffP

Posted
Posted

1995 Tahoe 5.7L TBI  60,000 miles.

 

I have been burning 87 octane gas in this ride since day 1.  I ususally stick with the same brand ( Exxon or Mobil ).

 

I have developed a "ping"  I think after the engine is warmed up or after 20 mins or so of driving.  It doesn't do it 1st thing, only after the engine has been driven for a while.

 

Anyway it's a light pinging on takeoff in the 1st & 2nd gear at low RPM.  It's not terribly loud, but I can hear it with the windows down.  I guess it's not so much a "ping" as it is a "gurgling" sound.   I guess it's a "cheap gas" sound, but like I said, I've always put 87 in it, so don't know why I have a problem.

 

Had a full tune up in the last month:  plugs, wires, cap, rotor, air filter, pcv valve, fuel filter.  I also just had my cat. converter replaced and my O2 sensor.  The gurgling/pinging noise was there before & after all these components were replaced.

 

Any ideas how to get rid of this?  I tried an octane boost additive ( Outlaw ) but no dice.  Any other additives which might make this go away?

 

p.s. I have no power/performance issues, this sound is just annoying me as it makes my big V8 sound like it's a piece of crap when I'm pulling up the street.  It only acts up after it's been driving a while.

 

Thanks in advance,

 

JP

Guest Friz

Guest Friz

Posted
Posted

I would play with the base timing ever so slightly.

An advance or retard as little as one degree could make a lot of difference. Mine is set at 3 degrees advance. Not by choice, I couldn't get a wrench on it and it runs great, so why change?

A few guys here have told me they get a smoother ride with up to 5 degrees advance.

MarkD Senior Enthusiast

MarkD

Posted
Posted

Do you have a means to read your O2 readings?

 

Causes of Pinging/Spark Rattle/Detonation

 

-Lean condition-check O2's

-Overly rich condition-check O2's

-Burning Oil-check Valve seals,PCV,EGR valve, rings

-Too much Timing-turn distributor while using timing light

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