5258Re: [bmw e28] Re: L-Jet problems. Tricky one...
- Jul 17, 2008Thanks for your help, Gil. I have replaced the brake bomb about 6 months
ago, because I thought the brake pedal was lacking a bit of 'vacuum
assist' (I know this system isn't the same as other makes but it felt
that way to me). The brake bomb didn't make any difference and I assumed
that was just how the brakes were meant to feel. I also tried what you
said. The brake lights stay on as normal and I can pump the pedal until
the car nearly stalls (the problem) without the lights failing. Also, if
I pump up the pedal and then start the car, the pedal does go down,
albeit a small amount compared to a vacuum assisted car. I think I may
change the master cylinder this weekend and see if this fixes the
problem. I think long-term I will be looking at fitting the Megasquirt I
have in the shed also.
Gil Thereault wrote:
> Hello Richard,
> From the idling issue to the brakes. Before you answer me, go out
> to the car and start it up. Take note, when you depress the brake
> pedal does the brake light go on briefly then goes out? If so the
> brake bomb is due to be replaced. The car will stop as it should but
> the brake pedal with feel funny. The purpose for this brake
> accumulator is when the engine inadvertently stalls, you have some
> vacuum store for a few pumps to get the car to a stop. I have done
> mine twice in the 8 years that I owned my e28. You can do that job
> yourself at home. The next thing come to mind is a faulty master
> cyl, some weird things happen there too. I had the front right
> caliper lock up from time to time and would not unlock unless things
> cool down or I bleed that caliper on the road. I you have some high
> mileage, I believe it would be a good idea to replace that as well.
> This is also something you can do at home. If you have Bentley manual,
> that will get you started. If I can do it you can do it. I then 8
> years that I owned my e28, I have been able to correct the issues
> without taking it to a garage. Keep in touch.
> --- On Thu, 7/17/08, Richard <tabull@...
> <mailto:tabull%40exemail.com.au>> wrote:
> From: Richard <tabull@... <mailto:tabull%40exemail.com.au>>
> Subject: [bmw e28] Re: L-Jet problems. Tricky one...
> To: bmwe28@... <mailto:bmwe28%40yahoogroups.co.uk>
> Date: Thursday, July 17, 2008, 3:58 PM
> 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@... <mailto:bmwe28%40yahoogroups.co.uk>,
> 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@... <mailto:bmwe28%40yahoogroups.co.uk>
> > 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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