The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Well, so much for "bulletproof" straight 6, motors knocking :(

BIG CTY · 05-29-2007, 09:20 AM

I'm going to expect the worst, but hope for the best here. I was driving the balls off of my rust bucket awhile ago and when I came to a stop, I heard knock knock knock going along with the idle. When I speed up, the knocking gets quicker, when I slow down it gets slower. Its not nearly as loud at idle as it is when I get in gear and go. I was running a good 75-80 for about 15 mins, RPMS were between 3500 and 4k.

Now I know enough to be dangerous, but I'm not sure where to start here. I'm kinda hoping that its something simple, but anytime I hear knocking in the engine area I get scared. Anyone have any advice? The truck is for sale and there is no way I can sell it sounding like this. Where in the he!! do I begin tracking this down?

05-29-2007, 09:20 AM	#1
BIG CTY Between the earth and the sky Join Date: Oct 2006 Location: Chesapeake, VA Posts: 822	Well, so much for "bulletproof" straight 6, motors knocking :( I'm going to expect the worst, but hope for the best here. I was driving the balls off of my rust bucket awhile ago and when I came to a stop, I heard knock knock knock going along with the idle. When I speed up, the knocking gets quicker, when I slow down it gets slower. Its not nearly as loud at idle as it is when I get in gear and go. I was running a good 75-80 for about 15 mins, RPMS were between 3500 and 4k. Now I know enough to be dangerous, but I'm not sure where to start here. I'm kinda hoping that its something simple, but anytime I hear knocking in the engine area I get scared. Anyone have any advice? The truck is for sale and there is no way I can sell it sounding like this. Where in the he!! do I begin tracking this down? __________________ Chris - 1966 C10 Shortbed Fleetside, 1991 GMC Sierra 1500 Extended Cab, 1993 Blazer Sport 4x4 My other rides: 1969 Chevrolet Impala SS427 Convertible 1976 Dodge Tradesman B200 2002 Nissan Maxima 6 speed 2004 Mercedes Benz CL500 Last edited by BIG CTY; 05-29-2007 at 10:15 AM.