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YOUR RESEARCHstrange engine sound
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Use mechanics stethoscope if you need
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Leading evidence: 'Use mechanics stethoscope if you need' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use mechanics stethoscope if you need' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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so i noticed yesterday, right after i did that PSE cutout mod, a new engine sound.. and not the sound i was looking for.
I have an MY03 coupe
1) it comes and goes.
2) its only there when the RPMs are coming down (not present at idle, not present when gasing it, doesnt matter what gear/neutral. When i hit the gas and let go, the engine will vroooom up and on the way down i'll hear the sound till it disappears on idle).
3) cant really notice WHEN it comes or WHY, but just randomly comes and about 30 seconds later it disappears. First time i heard it was when i was coming to a red light from afar and kept it in gear. Then at the red light, while in neutral i gassed it, and on the way down the sound was there immediately till disappeared in idle. next red light it was gone. Happened again day after (today)
4) it sounds like a fast clicking z sound, so on the way down its like a ZZZZZZZZZZZZZZZZZZZZ, fairly loud to be heard while sitting in the car.
PLEASE tell me it's not some engine issue
That one has me puzzled bro... I almost wanted to believe that it was a similar problem to mine when I lost my thrust bearings but if your engine is not shutting down when it gets to normal operating temp I would not say your situation is as dire as my past experience.
Could it be related to the PSE relay as the engine is winding down in rpm?
I did the same diode removal. I had mine out for city and highway combined 150 miles today. No sound like what you describe. I have a cab so maybe I need a quieter environment to notice if it was for sure.
I haven't listened to the sound, but get the car on a lift and isolate where the noise is coming from. Use a mechanics stethoscope if you need to.
If it's coming from inside the engine don't run it until it is fixed.
