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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Hesitation @ low RPM



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      11-23-2013, 03:44 AM   #1
G3ko
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Hesitation @ low RPM

Morning guys,

I have noticed a niggling issue with my BMW e90 330i . Basically at low RPM between idle at 2000 rpm in 2nd gear or above, if I press full throttle the car hesitate / jerks for a few seconds and then accelerates fine.

Now off some reading some people have had this and said coil packs could be the cause...

Does this sound likely? and could any tests be done to confirm the issue?
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      11-23-2013, 08:41 AM   #2
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I'd try pulling the maf, clean it and reinstall. Pull both vanos, clean and reinstall swapping positionsaround. Very easy to do and cost is just for a can of maf cleaner.
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      11-23-2013, 04:51 PM   #3
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Sounds like an idea, but could they really cause that problem without fail ?

If I'm gentle accelerating I never get any stuttering
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      11-23-2013, 05:08 PM   #4
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Had this and it was the coil packs
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      11-23-2013, 05:31 PM   #5
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Quote:
Originally Posted by gaza01 View Post
Had this and it was the coil packs
Seems like quite a common fault off reading a few posts over the internet. If I send it to my local bmw specialist wouldn't they most likely do the lot?

How much did it cost roughly to set right?
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      11-24-2013, 03:09 AM   #6
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A new set of OEM coils online would run around $40-45 a piece times 6, you minus will do the spark plugs at the same time which are around $80 a set.

Cleaning the MAF with MAF sensor cleaner ONLY is always a good idea, have them pull your codes if your getting any Vanos codes, the best thing would be to remove the Vanos solenoids clean them and swapping the positions around.

Throwing in a can of Redline fuel system cleaner in the tank is also a good idea.

See what you get.

Your mileage would help, coil/plugs are around 100k intervals, is your check engine light on (SES)?
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      11-24-2013, 03:42 AM   #7
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Same it rarely happens though. I'll do it when I do my 100k mile tune up.
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      11-24-2013, 09:17 AM   #8
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Quote:
Originally Posted by G3ko View Post
Sounds like an idea, but could they really cause that problem without fail ?

If I'm gentle accelerating I never get any stuttering
Yes, the MAF and/or VANOS can cause your car to hesitate on initial acceleration. And all you gotta do is pull them and clean them. Takes well under 30 minutes to accomplish if you take your time.

I drive my coil-packs to the ground and replace them when they actually fail. When they actually fail, you get misfire, motor runs rough, engine code. I didn't consider they can cause hesitation and not so sure that is true, but don't really know. What I do know is I had a hesitation as you described and it went away directly after cleaning the maf and repositioning and cleaning both vanos. Also, before that, I had already replaced all 6 coil-packs. 5 because they actually failed and the 6th just because.
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      11-25-2013, 07:08 PM   #9
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It could also just be that we have n52 engines and there's always that lag until you do a ecu remap and possibly one of the following scenarios bolt in cat back exhaust with an intake for the tune or tune, catless headers resonator delete intake work. A step up would be the intake manifold swap for guys without the 330i. But from what the other post are saying you do a full maintence from a reputable Indy and you will see the difference in your cars driving mechanics
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      03-24-2014, 12:01 PM   #10
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My car been having issues off cold-start. I have the BMS powerbox and the throttle response was lightning difference to stock, but now it takes more effort to get the rpm up after a cold-start. I reset the map and it'd be normal again... not sure if it's the BMS itself or something with the car? The car drives fine once I get it going... it's just first 2 gears is rough on taking off since input on throttle doesn't bring the rpm up much.
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