Subject: Re: Installed Vanos yesterday Author: rajaieq as Rajaie (moderator) : 163 posts Posted on: 2008-04-25 13:02:43

Thanks for the feedback and kind comments on the repair procedure.

Most O-rings will not be fully plasticized. The main failure point is the compression set (flat spots) on the O-rings. You should have found the old seal pistons to fit loosely in the cylinders and the new seal pistons to fit much tighter. This is the clear difference between failure and proper function.

Another owner recently complained of rough warm idle. Here was my response to him.

This could be many things, but not likely the vanos.
I would first guess the MAF sensor. Take it out and clean it with CRC MAF spray cleaner. Make sure to let it fully dry.
You can also disconnect the MAF electrical and see if the problem goes away.
You might need to replace the MAF.

Otherwise, it could be:
Dirty ICV or throttle body.
Failing CPS sensor. Check codes.
Maybe a vacuum leak.
Maybe failing pre-cat O2 sensor.
Dirty fuel injectors. Use a bottle of fuel injection cleaner.
Dirty fuel filter.
Failing fuel pump.
Failing coil or sparkplug.
Electrical problem.
Etc.

Let us know what you find.

Make sure you are not using aftermarket oiled engine air filters. They will foul the MAF sensor.

You will receive performance improvements as the seals break-in. Addressing your rough warm idle problem will also likely improve performance.

Rajaie
528i 5sp 06/00

• Installed Vanos yesterday - girmis 2008-04-25 09:36:00 (454 views)
  • Re: Installed Vanos yesterday - girmis 2008-04-29 14:12:53 (227 views)
    • Re: Installed Vanos yesterday - Rajaie 2008-04-30 00:15:14 (209 views)
  • Re: Installed Vanos yesterday - Rajaie 2008-04-25 13:02:43 (235 views)
    • Re: Installed Vanos yesterday - girmis 2008-04-25 16:15:36 (196 views)
      • Re: Installed Vanos yesterday - Rajaie 2008-04-25 16:38:24 (186 views)
        • Re: Installed Vanos yesterday - girmis 2008-04-28 16:40:17 (170 views)
          • Re: Installed Vanos yesterday - Rajaie 2008-04-28 17:33:57 (187 views)
            • Re: Installed Vanos yesterday - girmis 2008-04-29 01:40:34 (221 views)
              • Re: Installed Vanos yesterday - girmis 2008-06-27 22:08:45 (113 views)