07-23-2021, 04:36 AM | #1 |
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No boost issue... Help
Hi all, I am hoping someone can point me in the right direction.
Back story, I bought my 2012 328i 2 years ago with 58K on it, it was an ex lease car and had regular services and was looked after. After I bought it I took it to a local BMW specialist who checked it over and said it was in great condition, didnt need anything doing to it. Fast forward 12 months I got the timing chain checked out to be safe and it had no issues, 2 weeks later and my timing chain plastic tensioners crumbled causing my timing chain to come off and twisted my (crank or cam, can't remember which one they said) shaft This was all replaced at a £1200 cost and has been great! 2months ago I got a drivetrain malfuntion error which went away after a restart of the car, came back a week later, so I got it checked out and they said it was the valvetronic motor playing up and they ordered the part for me, I was told it was safe to drive whilst waiting for the part, the day I was taking it in the car got lumpy and pretty much ground to a halt, they came and collected it and checked it over and Fuel injectors 1&3 were clogged and had failed, this has apparently put more load on the valvetronic motor and caused it to completely fail. so they swapped them all out, encoded the fuel injectors, the VT motor and replaced the wiring loom and also retrained the DME (wiping my map unfortunately) Another £1200 spent, I picked the car up and drove home, but it isnt building boost at all and I get a DTM error when at around 2.5/3k rpm, they have taken it back, checked over all their work and said the error messages are just saying its underboosting and could be 1 of 4 things stuck turbo wastegate. Faulty Turbocharger unit Vacum leak Blocked catalyst They want to charge me another £600 to investigate what the cause is as they have to take the CAT off and take Turbo apart to check it all. I have read around and have heard valvetronic motors have a habit of taking out sensors with it, could this be true and what do people recommend ? when I start the car I get the usual rattle noise and it seems like I have boost at first, but then the rattle stops and I have none, and when slowing down I used to hear the rattle come back but it doesnt, could it being held open? I am at a loss, any help would be appreciated guys (and girls) Thanks |
08-02-2021, 01:21 PM | #3 |
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is it like a metallic rattle?
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08-03-2021, 07:01 AM | #4 | |
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08-08-2021, 06:22 PM | #6 |
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It would appear with those codes, your boost is off because the exhaust side vanos solenoid is stuck.
That should be easy to get at and replace. You could try removing and cleaning it then re-installing. I would make sure to grab some extra vanos o-ring gaskets. That, or you could just replace the solenoid.
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2017 BMW 330ix MSport Estoril Blue - B46, ER Catless DP, ER Chargepipe, FTP Intake Charge Pipe, BMS Cone Intake, BMS OilCC, Bm3 Stage 2. FI Exhaust, xHP Stage 3 OTS Transmission tune. CSFRace heat exchanger. Performance M Brake kit. AFE Carbon Fiber D.A.S.
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08-09-2021, 10:34 AM | #8 | |
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08-09-2021, 11:48 AM | #9 |
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08-10-2021, 03:03 PM | #10 |
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08-12-2021, 05:27 PM | #12 |
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Thanks, waiting for vacuum to arrive.
Strangely enough my boost seems to be hit and miss at the moment. Can't boost in 3rd upwards unless I've hammered boost in 2nd. My mind is boggled. |
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09-03-2021, 06:26 AM | #14 |
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Update:
Boost solenoid is good Vanos solenoid is good Vacuum pump has no oil in it. Next is pneumatic wastegate check, but that worries me a little, I'm an IT guy, not a mechanic 😂 Going to have to research more before taking that apart. |
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