Subject: Re: Increased fuel consumption: issue resolved- but no logical explanation... Author: rajaieq as Rajaie (moderator) : 955 posts Posted on: 2010-02-28 23:36:33

Congrats on all the fixes. That's great! Thanks for sharing.

Hard to be sure what caused the improved fuel consumption when the engine mounts were replaced. You can consider that the kinetic energy that went into the engine vibrations is now being delivered to the drive train. The car motion is also now more linier.

The ATF in the engine oil is an old mechanics trick. I'm impressed it worked so well for you. I know it acts as a detergent and removes buildup. This could help many things, including lifters, valve seating, piston seal sealing.

Nice work catching the air clog. I’ve found leaves in these passages but you had an extreme case. Yeah, you would think this would cause a negative fuel trim. I wonder if the DME decided to change the dynamics of the engine and run rich for enhanced performance. I wonder what high altitude drivers experience.

Glad you now finally have better gas mileage than before installing the vanos seals. Congrats!

Rajaie
528i 5sp 06/00

• Increased fuel consumption: issue resolved- but no logical explanation... - webhorn4477 2010-02-28 19:02:13 (798 views)
  • Re: Increased fuel consumption: issue resolved- but no logical explanation... - henrikk 2010-03-01 09:59:46 (535 views)
    • Re: Increased fuel consumption: issue resolved- but no logical explanation... - webhorn4477 2010-03-01 17:41:56 (500 views)
      • Re: Increased fuel consumption: issue resolved- but no logical explanation... - henrikk 2010-03-07 15:44:17 (444 views)
        • Re: Increased fuel consumption: issue resolved- but no logical explanation... - webhorn4477 2010-03-17 18:51:08 (378 views)
          • Re: Increased fuel consumption: issue resolved- but no logical explanation... - henrikk 2010-03-22 08:04:59 (326 views)
            • Re: Increased fuel consumption: issue resolved- but no logical explanation... - webhorn4477 2010-03-22 15:40:54 (413 views)
  • Re: Increased fuel consumption: issue resolved- but no logical explanation... - Rajaie 2010-02-28 23:36:33 (496 views)
    • Found even better mileage! - webhorn4477 2010-03-19 07:11:37 (453 views)
      • Re: Found even better mileage! - webhorn4477 2010-03-19 22:20:26 (466 views)
      • Re: Found even better mileage! - poolman 2010-03-19 12:21:20 (369 views)
        • Re: Found even better mileage! - webhorn4477 2010-03-19 22:25:57 (440 views)