CS310 Posted April 20, 2020 Report Share Posted April 20, 2020 I need some help identifying a sound. It's a high pitch rattling that happens under hard acceleration. I uploaded a quick video to YouTube. The link is below. Quote Link to comment
banzai510(hainz) Posted April 20, 2020 Report Share Posted April 20, 2020 Hard to hear some times I jack the car on all 4s and has some gas it while under car alternator loose if 4 speed the plate cover under the trans loose something simple I bet Quote Link to comment
CS310 Posted April 20, 2020 Author Report Share Posted April 20, 2020 The rattling sound starts at 1, 3 and 6 seconds into the video. I've been all over the car checking to make sure nothing is loose. I only hear the sound under hard acceleration. Specs are below. 72 510 L18 5spd Z trans 32/36 Weber Quote Link to comment
datzenmike Posted April 20, 2020 Report Share Posted April 20, 2020 Engine torque under load moves the exhaust pipe or muffler against something. Climb under and give the exhaust pipe a big hard shove. Quote Link to comment
Crashtd420 Posted April 20, 2020 Report Share Posted April 20, 2020 11 minutes ago, CS310 said: The rattling sound starts at 1, 3 and 6 seconds into the video. I've been all over the car checking to make sure nothing is loose. I only hear the sound under hard acceleration. Specs are below. 72 510 L18 5spd Z trans 32/36 Weber Does it happen at low rpms as your getting on the throttle? What about if your up in the rpm range already and give it full throttle? There is also something called lugging.. Internet definition.... Quote Link to comment
CS310 Posted April 20, 2020 Author Report Share Posted April 20, 2020 Mike: I had previously checked around the exhaust for any signs of rubbing and I couldn't find any, specifically around the rear cross-member. The entire exhaust system is firmly mounted. It doesn't move at all when you push on it. Not sure if that's a good thing. I'll check the exhaust system again to confirm. Quote Link to comment
CS310 Posted April 20, 2020 Author Report Share Posted April 20, 2020 Crash: I haven't noticed it at low RPM's under hard acceleration. I'll check later to confirm. I would say it happens around 2500-3500K RPM and continues until I lift. Quote Link to comment
banzai510(hainz) Posted April 21, 2020 Report Share Posted April 21, 2020 Like I said Jack up on all 4 and have somebody go under the car and act like your driving and shifting the gears. I did this on my 521. bolts were coming loose Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.