[R129 SL] MISFIRE

Sat, 21 Aug 2004 11:26:02 +0200

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The other day, with the petrol gauge just showing the orange light, I
filled up with about 65 litres with 95 RON. Immediately on restarting,
there was a misfire as if one or more plugs were not sparking. As my
friendly M-B dealer was only 400 yards away, I went in and asked the
head of the workshop if he knew what was happening. He revved the engine
in various ways using the throttle point behind the engine block (500SL)
and asked if I had used 95 RON. I told him 'yes' as this is the fuel
recommended by M-B and he said I should try 98 RON next time as the
engine seemed to be running weak - if he pumped on the way to building
up the revs, it went normally - when he opened the throttle any quicker,
the misfire was present.
=20
I drove away and within a few miles, the engine was back to its old
reliable self and has remained that way for the past 200kms using a
variety of throttle openings.
=20
Was it perhaps some dirt picked up with the tank running a little low?
Does anyone else have a similar experience.
=20
George Simpson
Cognac, France
=20
P.S. Next Tuesday, she goes in to have the front struts changed. As they
are ADS struts, it will cost around Euros 1,300  .. ouch

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<div class=3DSection1>

The other day, with the petrol =
gauge just
showing the orange light, I filled up with about 65 litres with 95 RON. =
Immediately
on restarting, there was a misfire as if one or more plugs were not =
sparking. As
my friendly M-B dealer was only 400 yards away, I went in and asked the =
head of
the workshop if he knew what was happening. He revved the engine in =
various
ways using the throttle point behind the engine block (500SL) and asked =
if I
had used 95 RON. I told him &#8216;yes&#8217; as this is the fuel =
recommended
by M-B and he said I should try 98 RON next time as the engine seemed to =
be
running weak &#8211; if he pumped on the way to building up the revs, it =
went
normally &#8211; when he opened the throttle any quicker, the misfire =
was
present.<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy'>I drove away and within a few =
miles, the engine
was back to its old reliable self and has remained that way for the past =
200kms
using a variety of throttle openings.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy'><o:p>&nbsp;</o:p></span></font></p>=

Was it perhaps some dirt picked up =
with the
tank running a little low? Does anyone else have a similar experience.<o:p></o:p>

<p class=3DMsoNormal><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy'><o:p>&nbsp;</o:p></span></font></p>=

<p class=3DMsoNormal><st1:PersonName><font size=3D3 color=3Dnavy
 face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;color:navy'>George
 Simpson</span></font></st1:PersonName><font color=3Dnavy><span =
style=3D'color:
navy'><o:p></o:p></span></font></p>

<p class=3DMsoNormal><st1:place><st1:City><font size=3D3 color=3Dnavy
  face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;color:navy'>Cognac</span></font></st1:City><fon=
t
 color=3Dnavy><span style=3D'color:navy'>, =
</span></font><st1:country-region><font
  color=3Dnavy><span =
style=3D'color:navy'>France</span></font></st1:country-region></st1:place=
><font
color=3Dnavy><span style=3D'color:navy'><o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy'><o:p>&nbsp;</o:p></span></font></p>=

P.S. Next Tuesday, she goes in to =
have the
front struts changed. As they are ADS struts, it will cost around Euros =
1,300 &nbsp;&#8230;. ouch<o:p></o:p>

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