Mechanics

A PINGING SOUND ONLY UNDER A LOAD

1990 GMC Suburban • 231,000 miles

I filled up with gas and nw I have a pinging sound and chattering I have changed the fuel filter, new plugs and wires new o2 sensor new distubtor and cap rotor butn it also has a rough idle it has plenty of power
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Vette2112
February 16, 2012.




Any CEL have codes read maybe knock sensor malfunction?

Tiny
Fixitmr
Feb 16, 2012.
Engine light came on for a couple secs thn went back off

Tiny
Vette2112
Feb 16, 2012.
Codes are in there even if light is off now.

Tiny
Fixitmr
Feb 17, 2012.
Its new too and still doin it

Tiny
Vette2112
Feb 17, 2012.
I was told maybe it jump time

Tiny
Vette2112
Feb 17, 2012.
Could be your KS not retarding the ignition timing or A stuck closed EGR valve that causing excessive combustion heat to detonate/ping-like a bunch of marbles being thrown into a tin can when engine is under load-

Rasmataz
Feb 17, 2012.
It only does it under a load and it has a rough idle I was just maybe clogged convertor im open to anything
AD

Tiny
Vette2112
Feb 17, 2012.
It takes a litte more time to start in the morning mre than usual

Tiny
Vette2112
Feb 17, 2012.
Lets do some troublshooting here instead of describing what's going on with it -do what we have suggested then report back your findings

Rasmataz
Feb 17, 2012.
I was told that a egr valve stuck open is bad and closed is good which is you can call my cell at 307-677-1886

Tiny
Vette2112
Feb 17, 2012.

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