Thanks Jim,
I'll try to measure the resistance -
Now, bear in mind Im elecricall challenged ;-) - so, I remove the plug
from the relay and set my meter to resistance - automatic scaling - and with
one wire to ground I touch the other to the plug going to a GP and read the
resistance?
I'm sure I'll figure it out.
BTW - I sent a seperate email with this question - but is there a preference
between Beru GPs and the much lower priced Bosch? I suspect Beru are OE.
After removing the intake manifold and the metal fuel inj lines to access
the GPs I'm in no hurry to do it again because one decided to die. But, it
looks like that's what I need to do - but this time, if Beru is preferred
that's what I'll use -
Thx -
Larry T (67 MGB, 74 911, 78 240D, 91 300D)
www.youroil.net for Oil Analysis and Weber Parts
Test Results http://members.rennlist.com/oil
PORSCHE POSTERS! youroil.net
Weber Carb Info http://members.rennlist.com/webercarbs
Porsche Road Test http://members.rennlist.com/roadtest/
.
----- Original Message -----
From: "Jim Cathey" <[EMAIL PROTECTED]>
To: "Mercedes Discussion List" <[email protected]>
Sent: Saturday, October 14, 2006 8:20 PM
Subject: Re: [MBZ] GP Infant Mortality
I replaced my GPs and the GP relay within the past 3 weeks or so.
Yesterday, the preglow light came on for only a second or less - even
though
it was in the upper 40s and hadn't been started since the night before
- it
was stone cold - it started instantly although it runs like one
cylinder
isn't firing evenly. Within a minute the engine idles & runs smoothly.
That's way too quick. No wonder it ran poorly.
I'm wondering about the possibility of a GP being bad out of the
box?
Certainly. The relay, too. It happens. 'New' relays usually are
new old stock, and the internal components can fail with age, though
not so much as with use. Most likely is the GP, or its wiring.
Also - is there a way to check each GP without removing them
Sure. The quick way is to pull the plug off the GP relay and use a
DMM to measure the resistance to ground of each one. The rated value
is 0.6 ohms, though it can vary with temperature. The important part
is that they all be about the same.
Even better is to use a hefty ammeter to measure the current to each
one. I just did that on the 190D a couple of days ago. Within a couple
of seconds each one dropped from about 28A to under 20A, except for the
bad one that was drawing about 2x normal current. (_That_ is a weird
failure mode.) Most people don't own an ammeter that is good for more
than 10A, however.
The GP's seem to be pretty basic - but I guess the innards could be
bad in
one.
They are pretty basic, but they're not as simple as the old series
plugs.
-- Jim
_______________________________________
http://www.okiebenz.com
For new parts see official list sponsor: http://www.buymbparts.com/
For used parts email [EMAIL PROTECTED]
To Unsubscribe or change delivery options go to:
http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.1.408 / Virus Database: 268.13.4/475 - Release Date: 10/13/2006
