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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 > Weird hesitation with no codes



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      11-16-2016, 05:44 PM   #1
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Weird hesitation with no codes

After a 250mi round trip, around 30-50 actual load, the car feels like it loses 10% of power for about half a second. This happens in just about any gear. All I can say is that when i shift into gear and give it a little bit of gas, after about a second, the car feels like it loses power and then goes right back to normal afterwords. WOT is no issue, I do have a boost leak but this is new.

I'm running another log tonight and will post when I get home but this has been happening for the past few days.

Monitoring the actual load, boost, and hpfp, they all seem to "drop" when this happens. Haven't changed my tune or anything.

Stage 2 MHD 93oct, CP, DP, Muffler Mod, DCI, BOV.
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      11-17-2016, 06:21 PM   #2
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If you know you have a boost leak, you should probably start by fixing it. Then see if this problem goes away.
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      11-17-2016, 06:25 PM   #3
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I don't mean for this to be obvious or some sort of smart answer....
maybe the boost leak just recently got a little worst? Pipes can shift/move slightly. if a clamp wasn't on straight or loose (or fastened on/too close to a curve), maybe it worked itself loose and caused the leak to be worst?
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      11-18-2016, 09:01 AM   #4
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Could it happen even though I'm not in boost? In most cases when driving, I'm not in boost. I'll check this weekend. I've got plans to check over everything including pressure testing, checking vacuum lines, among other things. Just weird that it happens while I had been driving for 100+miles in one day and just cruising.
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