04-03-2024, 02:06 AM | #1 |
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Cold air intake effect on stock n55
I just picked my car up from my mechanic after months in the shop because he had to replace my engine due to OFHG seize. Afyer install of the new engine, he told me the car was misfiring and he couldn’t find the cause as all coils, injectors and spark plugs were replaced. Before the first engine even seized I had him install a CTS intake. I notice a major difference and I feel like the stock motor isn’t holding the boost from the intake and causing it to misfire and jump. Should I take it off or just tune the ecu. Or any other reasons why I would be misfiring on a new engine?? Doesn’t make sense. Also not throwing any codes.
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04-03-2024, 08:45 AM | #2 |
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A cold air intake won't affect a stock N55 because the stock intake is cold air. Most aftermarket intakes are not. If you can see the filter it's not cold air.
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04-03-2024, 09:01 AM | #3 |
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It sounds like this new engine may not have been "new." It may have been rather new to the car in question. Find what cylinder is misfiring, then swap parts (coil, plugs, injector) to another cylinder. Does the issue follow the parts? If yes, replace the bad part; if not, something is amiss with this engine. My expertise is not significant enough to say more than that.
To answer your title posting, a cold air intake may 1. Increase the sound of the turbo, as the stock air box is referred to as a muffler. 2. If not a closed box design, it may result in a slight loss in throttle response and pressure. Eventually, this car will throw a code. However, that might be the start of a really bad day. Start with vetting fuel, ignition, and air.
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04-03-2024, 09:16 AM | #4 |
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you can just pull off the maf sensor cable and that will eliminate the intake configuration/maf reading, but that really shouldn't cause a misfire. If all the plugs/coils/injectors were replaced, it's time to start leakdown/exhaust gases in the coolant type tests.
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04-03-2024, 12:13 PM | #5 | |
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Anyways, the intake is going to make basically zero difference on a stock car (and even a tuned one frankly), and CTS is one of the best in terms of not affecting MAF readings. https://f30.bimmerpost.com/forums/sh....php?t=1765289 You can try swapping back to OEM intake but its unlikely CTS is the problem |
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04-03-2024, 02:47 PM | #6 | |
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04-03-2024, 02:53 PM | #7 | |
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04-03-2024, 04:25 PM | #8 |
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Can you describe the misfire? The word can mean different things to different people. Is it a rough idle? surging? only happens at WOT? does it backfire? does it smell like fuel or anything else? if it was really misfiring as defined by the DME there would be codes
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04-03-2024, 04:27 PM | #9 | |
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04-03-2024, 04:30 PM | #10 |
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04-03-2024, 04:31 PM | #11 |
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04-03-2024, 06:38 PM | #12 |
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Sooo scan before you turn the car off? Even if the malfunction goes away they almost always leave a shadow code even if the active code that shows the malfunction is gone. Even a OBD dongle should tell you that, ISTA or other mechanics software should gather even more info
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04-08-2024, 05:51 PM | #13 | |
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04-09-2024, 01:23 AM | #15 |
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08-28-2024, 05:23 PM | #16 |
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