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BMW 3-Series (E90 E92) Forum
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CEL when under load + boost
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03-26-2024, 06:23 AM | #1 |
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CEL when under load + boost
I just put in new spark plugs and a coil for a cylinder 2 misfire.
Car was running fine but now it’s throwing CEL every time i floor it and boost is 10+ psi w jb4 map5. I can feel a shake in the pedal for a few seconds and then the CEL pops on every time. Sometimes car runs hard after and sometimes it’s fine. Any ideas? Could this be a map sensor issue? Something else?
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2010 e90 335xi 6MT - JB4, DCI, Lux AEs
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03-26-2024, 09:42 AM | #2 | |
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by the steering wheel button, not the best. If not, use a proper reader to see what code you have. can be a lot of stuff, most common is missfire and this can be cause by many things. |
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03-28-2024, 06:33 AM | #3 |
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Thanks. Just bought a real scanner so will see once delivered. I have a feeling is gonna be another cylinder 2 misfire which i just fixed with a new coil.
Anyone had issues w misfires only once boost is above stock? I won’t throw a CEL under full load unless the jb4 is warmed up. Stock is fine but i want the power! |
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03-28-2024, 07:29 AM | #4 | |
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- sparkplug, coil pack : those are easy to diagnostic since you can swap them. - sparkplug gap and/or temperature rating - sparkplug coated in oil : classic bmw - injector : classic when you have index1 to 10 - fuel : hpfp early gen fail pretty fast - carbon built (valve can't close properly because of carbon built.) - tune - I saw someone reported that O2 can cause this because a bad reading and bad a/f ratio - piston ring a scan tool (proper bmw one) will guide you. |
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