I just realized I posted this thread under the wrong section. I'm going to repost in the Gas/general section. Everyone, thanks for your input so far.
I just realized I posted this thread under the wrong section. I'm going to repost in the Gas/general section. Everyone, thanks for your input so far.
Tom
1987 RX7 with 2000 LS1 - T56 Transplant
Full Time Engineer, Part Time Gear Head
http://www.badassperformance.com
Time to pull it and take a look. It is definitely mechanical, my guess is, you broke or lifted the top ring land and a piece is stuck in the top of the piston and is hitting the head.
www.socaldiesel.com
EFILive-DSP5......Switch your Attitude!
EFILive-CSP5......The Smart Way To Switch Your Cummins Tunes!
EFILive-DSP4......Switch Your Colorado and Canyon Too!
Tom, I moved the thread for you.Originally Posted by Wingnut87
It's hard to tell from the video, but it sure sounds like it is a mechanical problem with the engine. There's a definite knocking sound that is not spark knock. This may or may not show up as spark when you data log. What do your logs show? Possible causes could be anything from a cracked piston to loose cam bolts. I'd start pulling the engine apart and looking for the cause before knock knock turns into boom boom.
DigitalEFI- EFILive US Distributor
sales@digitalefi.com
678/344-1590
I hate to say it, but I didn't even have to finish the vid to tell you what that sound is, you have a rod knocking and it wants out. It won't run long like that. Sorry man, it sucks, but I'd put a 50 dollor bill on it :(
Last edited by kbracing96; August 20th, 2006 at 02:52 PM.
01 ECSB 1/2 ton 4x4 Forged 5.7 LS1 GMC
Custom KBracing front mounted, BW S480, intercooled turbo
Sounds like a rod know to me. With a video it is hard to tell but generally a deeper sound is a rod, something more like a tick is generally valvetrain. I would pull the pan and start feeling the rods from the back to front. If it is wasted you will be able to feel it. I would still check the bearings even if you don't feel anything. Good Luck
Moving the rest of the posts over??Originally Posted by joecar
TIA
Chuck L.
CODY Motorsports
Fuel Injector Service
Madison, GA.
706-342-3152
770-265-5144 [C]
Chuck,Originally Posted by Chuck L.
lol... sorry, oversight on my part, I have now moved those 2 posts, we're all on board now.
Joe
Last edited by joecar; August 20th, 2006 at 02:16 PM.
Well, it seems everyone thinks it is a rod knock. I will start pulling the bottom apart this weekend (I should have been racing by now). My new question is this: Why did the car run great for a few days? It was in a yard for a few months. I got it running and was driving it in and out of the garage for a few months. Then I got everything sorted out and it was great for about three days. Then the knock started. I guess I'm wondering what caused it and how can I prevent it once I fix my engine? Oil pressure was good. Fuel was at 54psi, but the PCM seemed to compensate for it. The car was running very rich (64 psi) for a while when I was trouble shooting it.
Tom
1987 RX7 with 2000 LS1 - T56 Transplant
Full Time Engineer, Part Time Gear Head
http://www.badassperformance.com
i would suggest removing the valve covers first... its super easy and the problem MIGHT be there.... its a lot simpler....
if the problem is not there keep going via the bottom...
"All that is needed for the triumph of evil is that good men do nothing..."