New 2009 2010 BMW Z4 - ZPOST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   New 2009 2010 BMW Z4 - ZPOST > BMW Z4 Forum (E89) > Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications

Post Reply
 
Thread Tools Search this Thread
      04-11-2022, 07:01 PM   #1
bpayne
Registered
0
Rep
2
Posts

Drives: '11 z4 35i, '10 Venza, 65 Fo
Join Date: Apr 2022
Location: Columbus, NC

iTrader: (0)

2011 Z4 35i sdrive

Mechanic blew up old engine. Replaced with lower mileage z4 35i engine. After having significant turbo problems (rebuilt both), now have valve train clatter issue. Whenever accelerating or decelerating, the transition from load to no load and reverse induces valve train clatter anywhere from 1800 to 3500 rpms. Important to note: going from full load (uphill, 5% grade or more) to a "hold" rpm induces horrible valve train clatter. Same for reverse: Going from no load downhill to moderate rpm "hold" as you approach a curve for acceleration through it, induces horrible valve train clatter.

The BMW tech said change viscosity in the oil. It helped, marginally. To me, either one of two things: IF it is oil related, there must be a "starvation zone" that to me indicates a blockage of some sort. It has a new elec oil pump, so my guess would be in the lines. Important to know, the asst mechanic crushed the oil filter which makes me believe he put the wrong one on, and is why the oil viscosity change wasn't the real help, the correct oil filter was.

Second issue - to me is related to variable valve timing. if the intake and exhaust valve sensors were bad, that could be "the thing." But, not likely both are bad at same time. Worth replacing (mechanic's dime). BUT, I am leaning toward crankshaft position sensor. BTW - did a test for worn belt and/or pulley tensioner issue. Negative on both.

HELP. My wife loves this little rocket ship. Mechanic IS BMW certified - doesn't mean he's good. But he has been very responsible - hasn't charge me a dime. But he's had it 4 months (after 1st replacement engine wasn't as advertised) and he's close, but nobody is striking a match for that cigar.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 06:25 PM.




zpost
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST