So, I will use this thread to keep track of and help me diagnose the actual problem with my newly acquired X5, time will tell if it is an electrical issue or actual mechanical failure of the trans itself.
http://www.xoutpost.com/bmw-sav-foru...-cheap-x5.html is the problem child.
Previous owner said on a couple hour drive to his fathers house to visit the trans began to act up and stick in 5th gear, he finished the drive without issue other then low power due to being in high gear. It has been parked for the last couple weeks before I bought it the other day. When I got there to check it out I drove it around their yard, no clunks at all when shifting to drive or reverse, but when I went to accelerate I could feel the ABS kicking on. ABS would stay on but as soon as I would let off the gas pedal and try to go again the ABS would shut off and all was normal. This is also coupled with ABS engaging at low speeds when on the brakes. No lights on the cluster for ABS or DSC ever came on.
After driving it around the yard a bit I gave the guy the money and made the drive home, maybe two miles. For the most part the drive was fine, I ended up getting a flashing check engine light (on the domestic cars I'm used to this is usually a catalyst damaging issue / multiple misfire) and the engine began to misfire but still got to speed with ease and shifted through all gears flawlessly. At 60 MPH I floored it and when it went to downshift it instead just free revved at which point I let off and just kept 60 MPH still without any issues.
Got it home and backed it into the driveway, misfiring pretty good, I grabbed my scanner (Scangauge II) and found P0720 and P0000. I cleared the codes and immediately the engine stopped misfiring and ran perfectly smooth.
Also at this time the battery light was flickering, on the scanner it showed roughly 12.5 volts at idle, no electronics were on to create a large drain. Just off idle voltage went up to around 13.4 but dropped again at idle. Battery was reading 12.03 volts yesterday after running it for a half hour the day before and reading 12.6 after shutting it off. Took the battery up and they did a charge and load test on it, came back as good but I have my doubts. It was at 12.68 volts last night when I got home, this morning when I left for work it was 12.5, I will check tonight when I get home also.
I already bought a new battery and will be picking it up tonight as this was the wrong battery type anyway and I just don't trust it as it looks like a cheap reman battery. I am also looking into the alternator rebuild kits, I certainly don't want to drop $300 on an alternator if a $75 rebuild kit will do the same thing.
I am looking into the INPA software and cable, I believe I can use that to look at the individual wheel speed sensors and see if one is messing up. Can I also use this to monitor the turbin and output shaft speed sensors in the transmission? If all of the electrical checks out then I am fairly certain I have a victim of the A clutch failure and at that point I will begin to drop the trans and rebuild it.
Anyone have any other suggestions? I am pretty new to BMW so I don't want to make any fatal mistakes
07-12-2016, 08:24 AM
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