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05-02-2024, 08:09 AM
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#1 |
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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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05-02-2024, 10:44 AM
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#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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05-02-2024, 02:01 PM
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#3 |
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Do you have a recording of the noise?
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05-03-2024, 08:17 AM
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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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05-05-2024, 02:01 AM
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#5 |
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... just the normal cold start at low temperature?
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05-05-2024, 07:55 AM
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#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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05-10-2024, 03:34 AM
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#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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05-10-2024, 08:40 AM
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#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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