Re: ENGINE HESITATION E34 Please help

[Henri Baccouche <henrib@xxxxxxxxx>]

Every single part I suggested to you...........I  replaced in my own car 122K
miles and with
excellent results. The advice I offered is backed with some 32 years of
mechanic work........
I happen to know the M20 and the M30 engines real well.
I have repeatedly found that 100-125K miles is a major wear indicator for these
parts.
Preventative maintenance is always a good investment as opposed to
crisis induced emergency repairs.....

Techron is worthless once an uneven spray pattern has developed IMO.
Bosch injector cleaning service costs about 50% the price
of a new injector. New injectors are also improved and revised designs.....and
are more likely to give trouble free service. Besides, the O rings are
shot........at 125K, the rubber gets hard. Ditto the vacumm
hoses, the throttle boot, the ignition wires etc........

All these work together and each can contribute to a rough idle/surging
condition........

I'll throw you another tip.........if you look on the exhaust side, the head
gasket is probably starting to leak oil. You are probably burning oil too (
like a quart every 1000-1500) ......through the valve guides/ seals.

Henri






Aaron and Aimee Ness wrote:

> That sounds like a lot of money spent for little benefit.  There are fairly
> simple ways to tell if most of these items are in need of replacement, i.e.
> carb cleaner to find vacuum leaks (why replace hoses and injector O-rings if
> there are no vacuum leaks?), checking the spray pattern of the injectors,
> etc.  Likewise, the wires/cap/rotor would be best to check rather than just
> replace.  You'll probably find that one or more of the components mentioned
> need attention, but I'm sure they don't all need it.
>
> I'm not a fan of pouring money into replacing things just because they have
> some miles on them.  My 528e has required extremely little to keep it
> running properly, which is one of the things that I like about BMWs.  If it
> required parts all the time, I'd have chosen an older Passat or Volvo
> instead.  I've owned it from 149k to its present 175k miles, and I have
> maintenance records from the PO to support this as well.  If you're going to
> voluntarily spend money on parts, at least buy something that takes cheap
> parts.  :-)
>
> I don't want to say you're wrong, Henri, but my experience has been
> different than yours.
>
> You might even be able to solve the problem with a bottle of quality
> injector cleaner - not the garbage like STP, etc.  Chevron Techron is pretty
> popular among VW Scirocco nuts, as far as a widely available product.
>
> Aaron
> '87 528e
> '88 325is?
> '70 Beetle
> '82 GPz550
> '82 Scirocco - RIP
>
> ----- Original Message -----
> From: "Henri Baccouche" <henrib@domain.elided>
> To: "matthew johnson" <nicodemis2@domain.elided>; <bmw-digest@domain.elided>
> Sent: Friday, July 12, 2002 1:11 PM
> Subject: Re: ENGINE HESITATION E34 Please help
>
> > With ~125K  mileage........I would  start by replacing all the injectors
> and O rings, vacumm and intake system hoses, throttle intake boot as just
> > normal maintenance. Has the O2 sensor ever been changed ?
> > After 10 years, new ignition wires and a new cap and rotor would also be a
> prudent investment.
> >
> > These cars need regular infusions of new parts to run correctly.
> >
> > Henri
> >
> > PS: At 125K, I have found the whole front suspension to be worn out
> .......
> > from the control arms to the strut bearings.
> >
> > matthew johnson wrote:
> >
> > > All I've got an e34 1991 535i that's been having some problems as of
> > > late that are getting worse.. mainly when I'm driving around town I'll
> hit the accelerator and
> > > the RPM needle will dip, then recover and the engine will catch.  My car
> has 125,000 miles on it.
> > >
> > > This is causing some stalls every so often (and I'm easy on the
> accelerator)
> > > and I'm ready to take it in.. before I do, I'm wondering if it's a job
> > > I can't do myself (fuel system cleaning, spark plugs, wires, etc.  Bosch
> Platium +4 no gaps are like 6 bucks per and the wires are about 200 bucks.
> > >
> > > The plugs and wires haven't been replaced since I bought the car and  I
> > > don't know when the owner previously had them replaced.  Any help would
> be
> > > greatly appreciated..
> > > >
> > > >Thanks,
> > > >
> > > >Nic
> > > New! SBC Yahoo! Dial - 1st Month Free & unlimited access
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