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Old 05-02-2024, 07:09 AM   #1
bdtbdtbdt
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Rattling noise at start up

I just changed OFT tunes. I went from OFT E85 stage 2 version 4.03 to 93 gas stage 2 v,4.03. I get a very scary metallic rattling noise that seems to be coming from the center of the engine bay for about 30 seconds when I start the car when it is cold. The noise goes completely away after 30 seconds. Car runs normally after that. I have driven over 150 miles since changing the tune. Any help?
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Old 05-02-2024, 09:44 AM   #2
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Never mind, Car started normally today. I'm guessing the ECU needed more time to learn the start procedure.
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Old 05-02-2024, 01:01 PM   #3
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Do you have a recording of the noise?
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Old 05-03-2024, 07:17 AM   #4
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Sorry , no recording, At first it sounded like rod knock ,I was devastated. It went away as i raised rpms. Just happened at idle. I am guessing maybe fuel knock from wrong timing advance
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Old 05-05-2024, 01:01 AM   #5
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... just the normal cold start at low temperature?
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Old 05-05-2024, 06:55 AM   #6
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I wish. It was loud and terrifying, thank god it stopped. Although I drove a hundred miles or more, I only had 2 engine starts since changing tunes. Thinking that the ecu starting and warmup learning had a glitch. Thanks all for this forum, it's great!
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Old 05-10-2024, 02:34 AM   #7
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How cold/warm was it outside?

Do you have any exhaust customizations?

How’s your dipstick looking? (Seriously)
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Old 05-10-2024, 07:40 AM   #8
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Cool, 40 degrees
OFT header UEL, and down pipe
Fresh Mobil1 5w-30. 1/2 qt high on the dipstick, lots of track driving.
It has positively stopped making any strange noise at start up since
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