engine noise plz help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Kybol · 06-28-2003, 04:14 PM

I was driving my truck and all of a sudden it started making this bad ticking/knocking type sound. I'm not to sure if it is the exhaust leaking or the engine it self. When I park it and run it nothing happens it is just when it is driving and seems a little worse under load. I let it idle and I can faintly hear the sound. Id idles kinda rough so I pulled a plug out and nothing happened, ran the same and the plug and header on that cylinder is cold. There is comp and spark there too. What could this be, thanks for any help

79BIG10 · 06-28-2003, 06:20 PM

Sounds like bad gas to me. Does it sounds like marbles or ball bearings in there? If you got some bad gas then you're causing predetontation. This is what happens to me when I try to run 87 on a engine that only takes 91 or better

Check this out by running that gas out and get some known good gas from a different station. If it goes away then you know what it was.

I doubt it's a exhaust leak since it doesn't happen at idle. An exahust leak usually is really noticeable at idle.

Kybol · 06-28-2003, 08:12 PM

Hopefully that is what's wrong, I threw in some farm gas

so I could get to town to bet real gas, I will try to run it out and see.

06-28-2003, 04:14 PM	#1
Kybol Registered User Join Date: Mar 2003 Location: Alberta, Canada Posts: 205	engine noise plz help I was driving my truck and all of a sudden it started making this bad ticking/knocking type sound. I'm not to sure if it is the exhaust leaking or the engine it self. When I park it and run it nothing happens it is just when it is driving and seems a little worse under load. I let it idle and I can faintly hear the sound. Id idles kinda rough so I pulled a plug out and nothing happened, ran the same and the plug and header on that cylinder is cold. There is comp and spark there too. What could this be, thanks for any help __________________ -90 454ss http://www.imagestation.com/album/?id=4289115843 -04 TRX450R -77 c-10 http://www.imagestation.com/album/?id=4290506213 SOLD -82 c-10 SOLD -02 CRF450 SOLD

06-28-2003, 06:20 PM	#2
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	Sounds like bad gas to me. Does it sounds like marbles or ball bearings in there? If you got some bad gas then you're causing predetontation. This is what happens to me when I try to run 87 on a engine that only takes 91 or better Check this out by running that gas out and get some known good gas from a different station. If it goes away then you know what it was. I doubt it's a exhaust leak since it doesn't happen at idle. An exahust leak usually is really noticeable at idle. __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

06-28-2003, 08:12 PM	#3
Kybol Registered User Join Date: Mar 2003 Location: Alberta, Canada Posts: 205	Hopefully that is what's wrong, I threw in some farm gas so I could get to town to bet real gas, I will try to run it out and see. __________________ -90 454ss http://www.imagestation.com/album/?id=4289115843 -04 TRX450R -77 c-10 http://www.imagestation.com/album/?id=4290506213 SOLD -82 c-10 SOLD -02 CRF450 SOLD



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