Going to do a compression test, have a few questions.

Jim_B · 10-17-2017, 03:12 PM

-The car is a 2009 328i xDrive
-My wife just bought it a few weeks ago.
-I'm going to change the spark plugs and figured I'd do a compression test while I have the plugs removed.
-I'm going to pull all the plugs and coils before I do the test.
-Is there anything that needs to be grounded? I know in the "old days" the ignition coil could be damaged if the plug wires weren't grounded. (Not necessarily on BMWs; I've seen it happen with a GM HEI coil.) I'm concerned about damaging the ECU. I don't think removing the coils and doing the test will be a problem, but I'd sure hate to be wrong.
-Where/which is the fuel pump fuse?
-I know I need to buy a quality service manual.

Thanks in advance!

ctuna · 10-17-2017, 04:22 PM

Do yourself a favor and get the Bimmergeeks diagnostic
cable download and setup Ista d and Inpa on a PC.
Ista d is what BMW used in its shops for the length or
the e90 production . Its a manual and diagnostic all in one.
It requires a some time to learn to use.
It will have the factory procedures within it.
See the coding sub forum.

http://www.e90post.com/forums/forumdisplay.php?f=368

There are many subforums within this site and a lot
of stuff on DIY on ytube,
http://www.e90post.com/forums/forumdisplay.php?f=16

http://www.e90post.com/forums/forumdisplay.php?f=378

10-17-2017, 03:12 PM	#1
Jim_B Private 15 Rep 73 Posts Drives: Wife's '09 328i xDrive Join Date: Oct 2017 Location: Colorado iTrader: (0)	Going to do a compression test, have a few questions. -The car is a 2009 328i xDrive -My wife just bought it a few weeks ago. -I'm going to change the spark plugs and figured I'd do a compression test while I have the plugs removed. -I'm going to pull all the plugs and coils before I do the test. -Is there anything that needs to be grounded? I know in the "old days" the ignition coil could be damaged if the plug wires weren't grounded. (Not necessarily on BMWs; I've seen it happen with a GM HEI coil.) I'm concerned about damaging the ECU. I don't think removing the coils and doing the test will be a problem, but I'd sure hate to be wrong. -Where/which is the fuel pump fuse? -I know I need to buy a quality service manual. Thanks in advance!
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10-17-2017, 04:22 PM	#2
ctuna Lieutenant General 1926 Rep 13,135 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	Do yourself a favor and get the Bimmergeeks diagnostic cable download and setup Ista d and Inpa on a PC. Ista d is what BMW used in its shops for the length or the e90 production . Its a manual and diagnostic all in one. It requires a some time to learn to use. It will have the factory procedures within it. See the coding sub forum. http://www.e90post.com/forums/forumdisplay.php?f=368 There are many subforums within this site and a lot of stuff on DIY on ytube, http://www.e90post.com/forums/forumdisplay.php?f=16 http://www.e90post.com/forums/forumdisplay.php?f=378
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