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5256Re: L-Jet problems. Tricky one...

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  • Richard
    Jul 17, 2008
      Thanks Gil, the engine has good vacuum and will stall straight away
      when the dipstick is pulled. Got my wife to pump the brake pedal while
      I listened and there is a definite vacuum leak coming from the master
      cylinder, corresponding with the engine losing vacuum. I am now
      thinking the pressure from the brake bomb is leaking back through the
      master cylinder, but I'm still not sure why this is causing the engine
      to lose vacuum. Maybe the engine isn't losing vacuum, just the power
      steering pump is having to work overtime to compensate for the air
      loss when the brake pedal is applied and it is placing too much load
      on the engine, causing it to drop in revs? Keep the ideas flowing..

      --- In bmwe28@..., Gil Thereault <giln1oiw2001@...> wrote:
      > Hello, Start to check or replace the vacuum hoses. I had found a
      few cracked or broken and replaced with new ones. A common culprit is
      the bellows tube that connects the air filter to the intake. This a
      common problem with cracking that allows air to enter the system.
      This will cause the problem you have described. A new one is less
      than $30.00 US or repair with a silicone goop as I did. So far it has
      lasted several years. The engines need a good vacuum pulling the
      dipstick or remove the oil cap will cause loss of vacuum with will
      stall the engine. Try these thing first.
      > 1986 535i 195k
      > Gil
      > --- On Thu, 7/17/08, Richard <tabull@...> wrote:
      > From: Richard <tabull@...>
      > Subject: [bmw e28] L-Jet problems. Tricky one...
      > To: bmwe28@...
      > Date: Thursday, July 17, 2008, 4:13 AM
      > Have a problem with my '82 E28 528i (Euro RH drive). The idle has been
      > really erratic lately, have tried just about every idle problem cure I
      > know with these L-Jets and the problem remains. I have finally traced
      > it down to the brake pedal. Strange, yes? If the car is idling and I
      > pump the brake pedal, the idle gets worse and worse until eventually
      > (after about 10 pumps) it stalls. It seems like a vacuum problem to
      > me, as the L-jet requires a near total vacuum seal or it won't run
      > well ie. if you remove the oil cap with the engine idling, it will
      > stall. I can't seem to find anywhere on the engine for a vacuum
      > connection to the brake system. Remember, the R/H drive model has a
      > different brake booster arrangement to the L/H drive model.
      > Any ideas???
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