BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)


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      12-08-2018, 05:17 PM   #1

Drives: 2010 135i A/T, Cobb V3
Join Date: Mar 2015
Location: Milwaukee

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Is any vacuum leak too much?

I recently did a fair amount of maintenance: water pump/thermostat, oil filter housing gasket, and accessory belt/tensioner/pulleys. Once I got the car all back together everything seemed fine. Drove it work and back, no problems. Then I tried to accelerate onto the freeway and my car goes into limp mode. Scan the code and it is a 30FF. The only vacuum line that I was close to were these ones with the red arrow.

In order to get them off the connectors I had to cut them. I then blew into them and clamped one end off and they seem to hold the pressure. If they are actually leaking it would have to be a small leak. Would that be enough of a leak to cause the car to go into limp mode or are these lines likely not the problem? The charge pipe and intercooler connections look good as far as I can tell. The car was working perfectly (minus the leaky oil gasket and water pump) before the maintenance.
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      12-13-2018, 02:20 AM   #2

Drives: E82 135i 7DCT
Join Date: Jul 2016
Location: 2153

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Vacuum is different to pressure. Any leak can make a noticeable difference. Looks like you may have to smoke test that vacuum tree and see exactly where it is leaking from.
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      12-13-2018, 06:28 AM   #3
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Drives: 128i
Join Date: Jul 2017
Location: NY

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Yes, any vacuum leak is enough to throw the system off. Unmetered air entering the crankcase will upset the calculations of the MAF as it enters the intake post-MAF via the PCV system. As noted, you need to perform a smoke test to locate the leak(s) and correct.
Life's tough. It's tougher when you're stupid. -John Wayne
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30ff, 30ff boost loss, vacuum hose, vacuum leak

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