11-04-2016, 08:40 AM | #1 |
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My Engine Malfunction - Reduced Power Story...
I was on a trip to NC from Pittsburgh 2 weeks ago. On the way back from Charlotte roughly in Virginia, I received a Engine Malfunction - Reduced Power message on my dash. We were roughly 360ish miles from home on a Sunday with my wife and 10 month old son.
We stopped a few times in hopes that on a restart the light would go away. Of course it didn't. So we ended up limping home all the way. We take the car to the dealership and at first they reprogrammed the ECU and all the modules in the car to the latest DME software. ( I personally didn't think this would solve this issue) But I went along with it. The dealership test drove the X5 and called me and said it was fixed! I pick up the vehicle, pay the $255 for the program and start driving home. As soon as I get on the on-ramp to the highway... guess what - Engine Malfunction - Reduced Power. So i drive it right back to BMW and jump right back in the same loaner! It takes a few days at BMW to run through their test plan and they notice that - CLIENT STATES CHECK ENGINE LIGHT IS ON FAULT FOR BOOST PRESSURE PLAUSIBILITY TOO LOW . WORKED THROUGH TEST PLAN AND COMPLETED ALL CHECKS INCLUDING MANUALLY APPLYING VACUUM TO WASTE GATE ACTUATOR AND FOUND NO CAUSE FOR BOOST PRESSURE ISSUE. CONTINUED TEST PLAN WITH RUNNING TURBO SELF TEST WHICH ABORTS. FOUND WHEN ENGINE IS HOT PRESSURE CONVERTER IS MALFUNCTIONING AND SUPPLYING CORRECT VACUUM TO WASTE GATE ACTUATOR. ACTUATOR WORKED CORRECTLY WHEN TESTED EARLIER IN TEST PLAN INDICATING A HEAT SOAK ISSUE WITH COMPONENT. REPLACED PRESSURE CONVERTER FOR WASTE GATE. CLEARED FAULT MEMORY AND ROAD TESTED 3 MILES OK. HAD DRIVEN EXTENSIVELY TO VERIFY REPAIR , NO MALFUNCTION OCCURRED IN OVER 30 MILES. 11-74-7-626-351 PRESSURE CONVERTER (Pneumatic Wastegate Actuator) So they road-tested the X5 for 30 miles and the light has not come back on. I pick the car up later today! Lets hope that this fixes the issue! I figured I'd write this up if anyone has this same issue and wants to replace the part themselves instead of the dealership. |
11-04-2016, 09:28 AM | #2 |
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Very good info! Do you mind re-posting into this thread? We've been trying to diagnose this issue since the beginning of time.
http://www.xbimmers.com/forums/showthread.php?t=1260684 |
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11-07-2016, 08:50 AM | #6 |
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So I drove the car for roughly 150 miles this weekend... FIXED!~
No check engine lights, performance is back. I'll of course continue to monitor this but it looks like it is solved! Thank the lord!
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11-09-2016, 06:04 PM | #9 |
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I didn't check the X5M vs the 550, but it's safe to assume the 550 has two of them as well. At $110 each on eBay, I'm going to clean them before replacing them.
Thanks for another piece to the puzzle.
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'10 BMW X5///M - Alpine White on Sakhir Orange - JB4 w/ HCP Stage 2 BEF, NGK 97506 @ .20, SS tubing & BMC filters, gutted cats, AC Forged 312 22's, H&R 2"
'98 BMW 740iL - ///E39 M5 6spd swap, fully built engine (sleeved, P&P, cams), 3.46 LSD, H&R Stage 2/Bilstein HD, Magnaflow 14816's '97 BMW 328ci - ///E36 M3 clutch & L/W flywheel, Z4///M 18's |
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11-10-2016, 12:21 PM | #10 |
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Haha its only 3 months old... Slowwwwly finishing it... Thats 13 feet of Granite Countertops in the back!
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11-11-2016, 11:41 AM | #14 |
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I had the dealership do the work, so I'm not sure the exact installation process. I'm sure I could of done it but was in a time crunch!
Also - roughly 300 miles and no CEL's!
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11-23-2016, 09:59 AM | #16 |
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No issues yet! Works perfectly. This at least solved my problem. Hopefully its the same issue you are having! I even put the BMS tune on my car about 200 miles ago after it was fixed.
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11-23-2016, 05:37 PM | #17 |
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Sounds good...both sensors are on the same bracket and a bitch to access, but I'm still plugging away and replacing all the vacuum lines while I'm at it.
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'10 BMW X5///M - Alpine White on Sakhir Orange - JB4 w/ HCP Stage 2 BEF, NGK 97506 @ .20, SS tubing & BMC filters, gutted cats, AC Forged 312 22's, H&R 2"
'98 BMW 740iL - ///E39 M5 6spd swap, fully built engine (sleeved, P&P, cams), 3.46 LSD, H&R Stage 2/Bilstein HD, Magnaflow 14816's '97 BMW 328ci - ///E36 M3 clutch & L/W flywheel, Z4///M 18's |
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11-23-2016, 06:26 PM | #18 |
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Respect! Not a easy repair. You will finish for sure. Good idea replacing vacuum lines too.
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11-26-2016, 04:45 PM | #20 |
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I'm willing to bet once you replace all those vacuum lines you'll fix the issue
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11-26-2016, 05:46 PM | #21 |
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The charge pipe lines were fairly easy, and even though I had a torn hose, that didn't solve the issue. The vacuum lines on the backside of the engine are easy to access, it's the 4 lines going from the sensors to the wategates and vacuum canisters that have the hardest routing. It looks easy in the realoem pics, as does the far right and far left PCV/CCV lines (which I need to remove before being able to do the catch can setup) that suck to access. I've been using my 4 day weekend to spend with family and naturally caught a cold, but I need to get it done since driving the convertible in the rain isn't nearly as much fun as the X5M :-)
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11-29-2016, 10:52 PM | #22 |
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Pretty confident I fixed my issue. I've posted a nice lengthy reply on the other thread since I've diluted this one long enough :-)
http://www.xbimmers.com/forums/showthread.php?t=1260684 Last edited by m5james; 11-30-2016 at 09:45 AM.. |
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