Question about 1997 BMW 328

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My bmw 1998 328i has back presssure it can only be the head gasket or it can be an other thing?

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  • Ned C Cook
    Ned C Cook May 11, 2010

    what do you mean by back pressure? In what?

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  • 158 Answers

Back pressire is usually caused by excessive ring wear. have a compression test done or a cylinder leak test to confirm the extent of cylinder wear.

Posted on Jul 11, 2009

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93 bmw 325i series,water dipping from behind tranmissionrun hot


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Thinking about buying a 1994 BMW 320i because i've always wanted a BMW, although the head gasket is completely blown and undriveable. What are the chances of me finding a mechanic to do the job on such an...


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Water back pressure problem what can it be?


ALSO THE AIR PUMP CONTROL VALVE COULD BE BAD. THIS COULD ALLOW WATER TO GET INTO THE AIR VALVE ALSO CAUSING BACK PRESSURE

Jul 11, 2009 | 1997 BMW 328

1 Answer

Starting problem


Sounds like the garage didn't do something correctly.

Apparently heads are a serious problem for BMW.

http://www.usautoparts.net/bmw/parts/bmw-head-gasket-world.htm

Here's a brief history and an unofficial description of BMW's position on their head problems:

http://www.unofficialbmw.com/all/engine/all_m42_profile_gasket_faq.html

Here's a step-by-step on the Timing Case ProfileGasket (aka, the head gasket) replacement for reference so you can see what should have been done:

http://www.pelicanparts.com/bmw/techarticles/101-Projects-17-Head-Gasket/101-Projects-17-Head-Gasket.htm

However, the good news is that the difficulty starting and the fuel leak may be just the result of a clumsy re-assembly in fuel delivery bar. Check out:

http://forum.ih8mud.com/80-series-tech/285535-fixed-head-gasket-but-now-have-fuel-leak.html

Now doesn't replacing a few O-rings sound better than having to tear the head off again? :-)

May 27, 2009 | BMW 325 Cars & Trucks

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