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Faults, Fixes and DIY Please share your experience and knowledge with other members by contributing your own DIY, or by helping another member find the elusive fix!


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Old Sun, Jan-10-2010, 04:58:15 AM   #21
yayorische
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Quote:
Originally Posted by Red Baron View Post
^^^^^^^^^^^^^^^^^^^
The photos on the BM are not necessary accurate for your model.
It might be another model, since they usually are a good guide, but not exactly.
True, but I think that'd be a pretty big variation across models. I don't know, I need to find a proper diagram for my car.

Another question: Does anyone know how the Bentley Manual can list compression figures, when it makes a huge difference how long the extension is that you're using for the gauge? Without knowing how long their hose extension was, there's no way I could compare it. Longer hoses = more air = lower readings.
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Old Tue, Jan-12-2010, 01:36:30 PM   #22
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What is the limit of the acceptable values for the leak-down test in our cars?
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Old Tue, Jan-12-2010, 02:55:04 PM   #23
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Originally Posted by Tiago View Post
What is the limit of the acceptable values for the leak-down test in our cars?
I don't think BMW has published specs for leakdown, but I do know that one FI vendor considers anything above 10% to be bad.
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Old Tue, Jan-12-2010, 05:35:17 PM   #24
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I don't think BMW has published specs for leakdown, but I do know that one FI vendor considers anything above 10% to be bad.
Thanks. I read a old post saing that max acceptable 10% (very good engine at 5-8%) with a max tolerance of 5% between each one (very good condition if below 3%).
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Old Wed, Jan-13-2010, 04:37:56 AM   #25
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Quote:
Originally Posted by yayorische View Post
True, but I think that'd be a pretty big variation across models. I don't know, I need to find a proper diagram for my car.

Another question: Does anyone know how the Bentley Manual can list compression figures, when it makes a huge difference how long the extension is that you're using for the gauge? Without knowing how long their hose extension was, there's no way I could compare it. Longer hoses = more air = lower readings.
The Bentley manual does not specify what gauge was used, although I would assume the figures are based on some kind of standard gauge that has been calibrated to insure accuracy. If you check the the pics in the OP you will notice the gauge they're using doesn't have a hose, which is probably ideal.

FWIW here's some general info referenced in the manual regarding tools..

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Old Wed, Jan-13-2010, 04:48:41 AM   #26
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Originally Posted by yayorische View Post
Hello doots.

First off I'd like to say props to the OP for posting up those pages of the Bentley Manual. Very helpful.

I've been doing quite a bit of research on how to run a compression test lately and came across this thread, and so far it's the most comprehensive.

I have two questions, hopefully someone can shed some light.

1) I drive a 2003 ZHP, and I'm wondering why is it that in my control unit box, there is a different number of relays than the BM pic?

Pretty sure I'm missing this one here:



Also, would anyone happen to know where I can find a diagram of exactly which relay is what? I plan on pulling the DME Main Relay and the Fuel Pump Relay to perform this test.

2) Has anyone figured out whether or not pushing down on the e-throttle will open the throttle body if the engine is NOT fully operational, and just being cranked? I've been trying to find this out for a week and have come to no conclusion. In the end I think I might just take off the intake boot, put the car on contact, lay a brick on the throttle and go take a look if it's opening. Putting the car on contact should make all electronics fully operational, but I don't know whether or not this'll affect the throttle plate.
The Bentley manual covers all E46 3 series cars, including the M3. Unfortunately many of the pics (including the ones posted) illustrate standard 3 series (non-M) cars and as Roberto mentioned will vary.
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Old Thu, Jan-14-2010, 02:05:46 AM   #27
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Originally Posted by RaceMX-M3 View Post
The Bentley manual covers all E46 3 series cars, including the M3. Unfortunately many of the pics (including the ones posted) illustrate standard 3 series (non-M) cars and as Roberto mentioned will vary.
Mine is a non-M. I believe that photo I posted might be an automatic.

Did some more research and math, and it seems that using a small hose (28 cm extension) should have virtually no effect on the readings, so it's not a big deal. On a 150 PSI test, you could expect a difference of ~0.28 PSI for a 15 cm extension vs. a 28 cm extension.



Now my issue is exactly how I am going to keep the throttle body open. I can't figure this out. I unhooked my intake boot from the filter and asked a friend to crank the car with her foot on the throttle and off. Does the exact same thing in both situations, never went even close to WOT. You guys with S54s are easy as shown in the beginning of this thread. I'm not sure if mine has such a spring which I can hold open.
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Old Tue, Jan-19-2010, 05:38:15 PM   #28
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Excellent DIY! Thanks Bro for clearing up some thoughts i had about it. Cheers.
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Old Thu, May-27-2010, 10:33:18 PM   #29
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I just followed this DIY and it helped out immensely!
I'll have to take a picture of the relay I removed since the picture isn't really clear (maybe just for me) since I have SMG.

The Bremi coils are a pain to remove but with a large screwdriver as horizontal bar, it worked like a charm. The Bosch coils don't click like the Bremi's. When you try to lift the handle, the connector doesn't always break free.

I didn't force the linkage open. I just held the gas pedal down when turning the engine over. No sense in forcing the linkage open if you're going to be in the drivers seat anyway.

It was an eye opener for me. I only had 2 chrome nuts holding down the cover. The other 4 were missing. I was also missing a bolt from one of the wire loom brackets inside the cover. Whomever did the last valve job was sloppy.

Thanks RaceMX!
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Old Thu, May-27-2010, 11:05:13 PM   #30
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Oh and I forgot, I have the lit up gear on my dash... I'm guessing it will go away when I drive the car a couple of miles?
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Discussing DIY: S54 Cylinder Compression Test in the Faults, Fixes and DIY Forum - Please share your experience and knowledge with other members by contributing your own DIY, or by helping another member find the elusive fix! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)