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BMW 3-Series (E90 E92) Forum
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Strange Idle BackFire.
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| 10-11-2016, 07:21 AM | #1 |
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Second Lieutenant
 42
Rep 281
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Strange Idle BackFire.
Hey guys so I'm running MHD with BackFire. And I've noticed that on cold starts my car kinda makes a weird noise from the exhaust, I have no idea what it could be, it only happens for around 1 minute, then when RPM'S settle car goes to normal. Any idea would it could be? Thanks in advance. |
| 10-24-2016, 08:22 PM | #2 |
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Brigadier General
 
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Drives: E90 6MT FBO; '18 F150 Platinum
Join Date: Jul 2013
Location: WI
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backfire lolz
__________________
 2008 335xi 6MT | VRSF Catless DP | VRSF 7" FMIC | VRSF CP | TIAL BOV | DCI | MHD 2+ BC Racing BR | Stoptech 600 | Firehawk Indy 500 255 Square | Atric Altimax 225 Sq. 2018 F-150 Platinum 701A | FX4 | 3.5 EcoBeast |
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| 10-25-2016, 07:38 AM | #3 |
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Enlisted Member
 
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Rep 38
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same thing on my 09 335i. I have after market exhaust on oem when engine is cold one of the valves on the exhaust remains closed, believe so engine warms up quicker. But honestly I think its just injectors seen guys install the latest index 12 and on cold start it sounds perfect.
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