June 3, 20213 yr Author comment_622679 The car did not always make this sound. My first step is to find out where the smoke is coming from. In case you missed it here is what I did to the engine while it was out of the car Engine Work done: new fuel injectors oil pan gasket lashed valves replaced EGR new oil filter rear main seal pilot bushing Link to comment https://www.classiczcars.com/forums/topic/60184-rust-advice-78-280z/?&page=27#findComment-622679 Share on other sites More sharing options...
June 3, 20213 yr comment_622706 a large bore rubber hose (like a heater hose) held up to the ear and then move the open end around the engine bay may help zero in on the noise. it sounds external. this technique is very good at finding exhaust leak noise. Link to comment https://www.classiczcars.com/forums/topic/60184-rust-advice-78-280z/?&page=27#findComment-622706 Share on other sites More sharing options...
June 3, 20213 yr Author comment_622707 I bought a car stethoscope to do that. Hoping to have time this weekend to troubleshoot. Link to comment https://www.classiczcars.com/forums/topic/60184-rust-advice-78-280z/?&page=27#findComment-622707 Share on other sites More sharing options...
June 3, 20213 yr comment_622717 2 hours ago, gotham22 said: I bought a car stethoscope to do that. Hoping to have time this weekend to troubleshoot. A stethoscope won’t “hear” an exhaust leak. It is great for tracking down mechanical noises though, like that knock on the video. Link to comment https://www.classiczcars.com/forums/topic/60184-rust-advice-78-280z/?&page=27#findComment-622717 Share on other sites More sharing options...
June 3, 20213 yr comment_622726 A little story... I had a 95 suburban that went in for an oil change. Well they forgot to refill the oil but I really couldn't prove it. It had a rod nock after that. A local racer told me to run 20w-50 in it. Quiet as a mouse. We ran it that way for a long time Link to comment https://www.classiczcars.com/forums/topic/60184-rust-advice-78-280z/?&page=27#findComment-622726 Share on other sites More sharing options...
June 14, 20213 yr Author comment_623460 Been slow progress but I wanted to send an update. Oil pressure seems good. Its around 20psi during idle. I also fixed the down pipe exhaust leak (noise is still the same). Next I am going to do a compressions test and then check timing. Again thank you all for your help Link to comment https://www.classiczcars.com/forums/topic/60184-rust-advice-78-280z/?&page=27#findComment-623460 Share on other sites More sharing options...
July 6, 20213 yr Author comment_624600 great news! it was just a valve adjustment when the engine was hot. IMG_3807.mp4 Link to comment https://www.classiczcars.com/forums/topic/60184-rust-advice-78-280z/?&page=27#findComment-624600 Share on other sites More sharing options...
July 8, 20213 yr comment_624708 did you find one super loose? that was a lot of noise for a valve setting. Link to comment https://www.classiczcars.com/forums/topic/60184-rust-advice-78-280z/?&page=27#findComment-624708 Share on other sites More sharing options...
July 9, 20213 yr Author comment_624781 there were a couple that were loose. I adjusted it while hot. Then I ran the engine and did a second adjustment. I think I finally got it. Sounds good now, right? Link to comment https://www.classiczcars.com/forums/topic/60184-rust-advice-78-280z/?&page=27#findComment-624781 Share on other sites More sharing options...
July 9, 20213 yr comment_624808 sounds fine, maybe the microphone in the camera was making is sound louder, I mean it was REALLY loud before, more than a typical valve tic. Link to comment https://www.classiczcars.com/forums/topic/60184-rust-advice-78-280z/?&page=27#findComment-624808 Share on other sites More sharing options...
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