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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Underboost, faulty Injector?



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      04-25-2012, 07:42 AM   #1
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Underboost, faulty Injector?

Might seem like a stupid question, however as some of you guys know when I had my Evolve stage 2 flash a few months ago it was only reaching 12psi when target boost was 14. Not only this, it was running rough an felt down on power.

I've recently had a couple of leaky injectors replaced, they were that badly carbonised that it was restricting the fuel flow on both injectors. The difference it made to the power was huge, lots more grunt and the midrange is now vastly improved.

My question is, would the DME automatically reduce the boost if it detected major fuelling issues hence why I wasn't quite hitting boost target?

Hunted high and low for boost or vac leaks to explain the underboost and found nothing so i'm hoping the problem has been solved with the new injectors?
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      04-25-2012, 05:00 PM   #2
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Anyone?
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      04-25-2012, 05:10 PM   #3
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If the DME was still targeting 14psi and couldn't hit that target then that means the DME was still wanting 14psi, not that it had adapted down to 12.
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      04-25-2012, 05:33 PM   #4
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Not sure what you're saying? Are you saying the DME could have pulled boost hence not hitting target due to the crapped out injectors or that it would still boost to requested target regardless?
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