PDA

View Full Version : Grounding wire on a spark plug


t_marat
02-02-2007, 01:56 PM
Below is the picture I took while changing the spark plugs. Somebody told me that there should be a second grounding wire (left side of the pic) on another plug. Is it true? will that affect performance?
acidfire52
02-02-2007, 02:28 PM
I have two on mine. At plug 3 and 6 IIRC.
t_marat
02-02-2007, 03:25 PM
Is it that specific where those grounding wires should be?
Dave M
02-02-2007, 03:28 PM
Is it that specific where those grounding wires should be?

good question. FWIW, mine are also on 3 and 6.
t_marat
02-02-2007, 04:18 PM
good question. FWIW, mine are also on 3 and 6.
6th cylinder is if counting from the windshield or from the front side of the car?
tnt525i
02-02-2007, 04:48 PM
counting from the front, so the 6th cylinder is nearest the windscreen
acidfire52
02-02-2007, 05:17 PM
I would guess one strap per bank.
632 Regal
02-02-2007, 06:07 PM
thats what my 530 has...1 per side.
ericcamaro
02-02-2007, 07:44 PM
mine only has 1 on 6.
Spice Boy
02-03-2007, 01:29 AM
I have 2 straps, 525i 24v M50

If you want, I could take some pics and post up where they are?
Morgenster
02-03-2007, 04:35 AM
I have 2 straps, 525i 24v M50

If you want, I could take some pics and post up where they are?

Yes please :D.

I have two but I'm not sure if they're on 3 and 6. Then again, I have a crappy idle.
t_marat
02-03-2007, 04:37 AM
well, if you already have one then yes. otherwise do not bother taking off the cover. It seems to me that one strap should be enough. Please correct me if I am wrong.
Bill R.
02-03-2007, 11:13 AM
.
t_marat
02-03-2007, 01:15 PM
there is something written about the siemens ms40 DME. thats I believe what is installed in my car. where that resistance is located, within the DME box?
and also it states only ignition coil from "may & chrite" can be used. mine are brembi. is it interchangable with Bosch?
632 Regal
02-03-2007, 02:19 PM
use the same brand wires with the coils, not brembi coils and bosch wires etc...

there is something written about the siemens ms40 DME. thats I believe what is installed in my car. where that resistance is located, within the DME box?
and also it states only ignition coil from "may & chrite" can be used. mine are brembi. is it interchangable with Bosch?
t_marat
02-03-2007, 02:36 PM
use the same brand wires with the coils, not brembi coils and bosch wires etc...
Never ever heard of a "may & christe" brand coil.
John B.
02-05-2007, 10:11 AM
According to the ETK the M50 engines after 5/93 had one ground strap, before that date 2. My car was built 6/95 & only has one.
t_marat
02-05-2007, 10:22 AM
According to the ETK the M50 engines after 5/93 had one ground strap, before that date 2. My car was built 6/95 & only has one.
Good, cleared one question out of my mind :)
Bill R.
02-05-2007, 11:07 AM
find that info in the etk, I'm not able to locate it.




According to the ETK the M50 engines after 5/93 had one ground strap, before that date 2. My car was built 6/95 & only has one.
John B.
02-05-2007, 12:03 PM
Maybe I got it wrong but if you open the parts page showing the valve cover, ect for my 95 525i Touring it shows a ground strap there with the info I gave. If I open the page showing the coil & assorted parts & click on the only item that could be a ground strap it says its not used on my vehicle. So I assumed the part #12 42 1 437 633 is the ground strap we are talking about & the info given would explain why some cars have 2 & others have 1.