Re: Spark Plug Question

[alex.fadeev@xxxxxxxxxxx]

"Ron Buchalski" <rbuchals@domain.elided> wrote:
> I'm not sure what you're measuring for gap, but the dual electrode
> plugs are pre-gapped when manufactured, and don't require any gap
> setting.  That's probably why you didn't find any gap information 
> in the Bentley manual.
> Just pull 'em out of the box and install them.
 
What Ron said.
Frank,
Multi-electrode plugs can not be re-gapped and like their single-elecrtode 
siblings come pre-gapped from the manufacturer. 
I assume you had bought either Bosch F7LDCR or NGK BKR6EK plugs, right? 
Doesn't matter which of the two. Both work equally well and BMW used them 
interchangeably throughout the production run. My '95 M3 came with OE NGKs 
and now runs happily with Bosch plugs. 
If you bought some other brand/model, throw them away and order the 
correct parts. 
Your ///M3 is not a lawn mower. It has a precisely engineered computer 
controlled ignition system. Screwing around with cheap ass components to 
save a buck or blocking air passages just for kicks is a road to poor 
performance at best and engine damage at worst.

What was your reason for replacing the 02 sensor? Did the old one die? If 
so it may take the DME a bit of time to re-adjust to a new valid 02 sensor 
inputs. If the stutter does not clear a few days of running, double check 
that everything you touched is plugged in back and torqued correctly. 

BTW, did you see any oil in the spark plug holes? If so, replace the valve 
cover gaskets ASAP and/or start shopping for six new coils.

alex f

> >Date: Thu, 5 Dec 2002 12:05:42 -0700
> >From: "Frank & Kirsten" <FranKirsten@domain.elided>
> >Subject: Spark Plug Question
> >
> >I have a 1995 M3 and just installed new spark plugs and an oxygen
> >sensor. The spark plugs were the standard bosch plug gapped at .032
> >inch.
> >Now my idle seems to have a stutter or pulse (drops about 200 rpm) that
> >it did not have before the change. So, did I use the incorrect gap size
> >and this may be the cause of my idle problem?
> >
> >By the way, I could not find the spark plug gap in the Bentley manual
> >and the Haynes says .035 gap, I used .032 from the web page that I
> >ordered the spark plugs. Just what is the correct gap?
> >
> >Thanks, Frank

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