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E12, E28, E34, E39, E60 General discussion and technical help for all year 5 series cars.

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Old 09-30-2010, 10:51 PM   #1
nicosuave3

Name: nicosuave3
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Join Date: Oct 2009
Location: Orange County CA
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Your Ride: 2004 530i M54
RPM drop

2004 530i E60 M54 automatic
115k miles

1.) When I let off the gas and the car is coasting (at almost any speed, but always happens above 40 mph) and I don't apply any brakes; when the RPM reaches ~1100-1400 the motor will bounce/hit a harmonic, jumping 200 RPM up and down always between the ~1100-1400 RPM. If I apply brakes or a small amount of accelerator the engine stops bouncing around RPM. This has been happening for about 6months.

2.) About 2 months ago I began having acceleration issues. At about 2500 RPM the motor will hesitate and bounce RPM when applying moderate gas. If I give it more gas the hesitation disappears and the motor accelerates strong. I have noticed some decrease in mpg.

For problem (2) I have found that this can be caused by the vanos (variable valve timing) seals can cause this problem and there is a fix for this: http://www.beisansystems.com/index.html

The computer isn't throwing a code causing a check engine signal.

- I've cleaned the ICV (idle control valve) and it seems to move very freely when shaken back and forth.
- Changed the CCV (crank case ventilation valve) and all associated hoses.
- Replaced the DISA valve.
- I've looked for vacuum leaks by spraying carb cleaner near hoses, no fluctuation in RPM
- Spark plugs have been changed.
- Air filter is free of debris and clean.
- Looked at MAF (mass air flow sensor), it was not clean but cleaned it anyway
- Don't seem to be any crack in rubber hoses

Please help before I spend way to much money to have it diagnosed and not find the real problem.
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Old 10-03-2010, 09:22 AM   #2
macky55e34lover
 
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Name: macky55e34lover
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Location: Philippines
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Your Ride: BMW '94 E-34 525i
we need an OBD, a computer to check for errors, apparently you already have done most of the things and checked out almost everything, better see a specialist, hopefully it's just a sensor somewhere
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