LS1 knock?? Help please, video link
Thread Starter
Teching In
Joined: Jul 2018
Posts: 5
Likes: 0
LS1 knock?? Help please, video link I just bought this 93 Porsche Swapped with an LS1 and our about 400 miles on it. Fresh oil in the car and overall motor has 20k on it. I know there is no way to prove that but this was a build done at a shop with receipts so I have some confidence but obviously something is off. Since this motor is an LS1 really hoping this community can give me some advice on cause of noise and how to fix? Not sure if it could be a lack of oil due to sludge or just a lose lifter or something? Previous owner only put 3500 miles on this build in about 8 years so lack of use could be an item. Oil and all fluids are new though. I just heard this noise on start up, oil temp 90 but did not hear it last I drove when oil was warm, perhaps I missed it but worrh noting.
Thread Starter
Teching In
Joined: Jul 2018
Posts: 5
Likes: 0
Just wanted to thank everyone for the help and suggestions. The search feature on this forum also answered a lot of my how to questions which is terrific. I pulled the valve cover, rigged the coil packs and with the car running could not see any issue. Turns out my header was really lose and the cause of the noise. Surprised the bolts backed out (3500 miles) but please that is all it was! Seems to be good to go now but did not replace valve cover gasket so will watch for leaks and replace if needed. Thanks to all again!
Trending Topics
It honestly sounded like a bottom end noise to me, but I saw you had what looked like decent oil pressure when you started it. So I was a little hesitant to fully think it’s that. Glad you figured it out.
Also keep in mind weird noises like that could also be your accessories. Don’t forget to pull the belt and run it a brief spell before you doom and gloom it.
Also keep in mind weird noises like that could also be your accessories. Don’t forget to pull the belt and run it a brief spell before you doom and gloom it.
