A PINGING SOUND ONLY UNDER A LOAD

1990 GMC Suburban

Tiny

vette2112

February, 16, 2012 AT 3:25 AM

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

FOUND 293 RELATED QUESTIONS

4.2 Pinging

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Pinging

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79 Answers

Tiny

fixitmr

February, 16, 2012 AT 3:58 AM

Any CEL have codes read maybe knock sensor malfunction?

Tiny

vette2112

February, 16, 2012 AT 4:46 AM

Engine light came on for a couple secs thn went back off

Tiny

fixitmr

February, 17, 2012 AT 1:16 AM

Codes are in there even if light is off now.

Tiny

vette2112

February, 17, 2012 AT 1:50 AM

Its new too and still doin it

Tiny

vette2112

February, 17, 2012 AT 1:51 AM

I was told maybe it jump time

Tiny

rasmataz

February, 17, 2012 AT 1:58 AM

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-

Tiny

vette2112

February, 17, 2012 AT 2:19 AM

It only does it under a load and it has a rough idle I was just maybe clogged convertor im open to anything

Tiny

vette2112

February, 17, 2012 AT 2:21 AM

It takes a litte more time to start in the morning mre than usual

Tiny

rasmataz

February, 17, 2012 AT 2:25 AM

Lets do some troublshooting here instead of describing what's going on with it -do what we have suggested then report back your findings

Tiny

vette2112

February, 17, 2012 AT 2:32 AM

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

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