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Discuss 1990 420SEL Starting Problem? in the alt.auto.mercedes forum at Car Dealer Forums; This may sound trivial, but I'm getting nervous! The car has always started within 1 ...
  1. #1
    John Simpson
    Guest

    Default 1990 420SEL Starting Problem?

    This may sound trivial, but I'm getting nervous! The car has always started
    within 1 second, hot or cold. I would guess on the first revolution after
    engaging the starter. Lately, it cranks for a couple of seconds before
    starting. It runs fine once it has started. It's got 180K miles on the
    odometer. Plugs haven't been changed for years! Fuel pump relay was new
    about 8 months ago.

    Any ideas? Fuel filter? Plugs? I'm paranoid?

    Thanks in advance.

    John S.



  2. #2
    Thom
    Guest

    Default Re: 1990 420SEL Starting Problem?


    John Simpson wrote:
    > This may sound trivial, but I'm getting nervous! The car has always started
    > within 1 second, hot or cold. I would guess on the first revolution after
    > engaging the starter. Lately, it cranks for a couple of seconds before
    > starting. It runs fine once it has started. It's got 180K miles on the
    > odometer. Plugs haven't been changed for years! Fuel pump relay was new
    > about 8 months ago.
    >
    > Any ideas? Fuel filter? Plugs? I'm paranoid?
    >
    > Thanks in advance.
    >
    > John S.


    Plugs


  3. #3
    Richard Sexton
    Guest

    Default Re: 1990 420SEL Starting Problem?

    In article <mRmJg.6389$SZ3.3982@dukeread04>,
    John Simpson <jasimp@earthlink.net> wrote:
    >This may sound trivial, but I'm getting nervous! The car has always started
    >within 1 second, hot or cold. I would guess on the first revolution after
    >engaging the starter. Lately, it cranks for a couple of seconds before
    >starting. It runs fine once it has started. It's got 180K miles on the
    >odometer. Plugs haven't been changed for years! Fuel pump relay was new
    >about 8 months ago.
    >
    >Any ideas? Fuel filter? Plugs? I'm paranoid?


    Change the plugs. Wouldn't hurt to do all the filters too. Expect
    a slight milage increase if you do.


    --
    Need Mercedes parts? http://parts.mbz.org
    Richard Sexton | Mercedes stuff: http://mbz.org
    1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net
    633CSi 250SE/C 300SD | http://aquaria.net http://killi.net

  4. #4
    Guenter Scholz
    Guest

    Default Re: 1990 420SEL Starting Problem?

    In article <mRmJg.6389$SZ3.3982@dukeread04>,
    John Simpson <jasimp@earthlink.net> wrote:
    >This may sound trivial, but I'm getting nervous! The car has always started
    >within 1 second, hot or cold. I would guess on the first revolution after
    >engaging the starter. Lately, it cranks for a couple of seconds before
    >starting. It runs fine once it has started. It's got 180K miles on the
    >odometer. Plugs haven't been changed for years! Fuel pump relay was new
    >about 8 months ago.
    >
    >Any ideas? Fuel filter? Plugs? I'm paranoid?
    >

    Hi John, my 89 300e started doing the same thing earlier this summer,
    it has not gotten worse. I've changed plugs etc etc to no avail... whereas
    it used to start with a turn or two, it now takes 4 or 5 sec cranking and
    once it starts everything is fine. Moreover, and this may be fortuitous, this
    is the first summer that the car apparently has suffered vapour lock - ie
    it took over 5 min or thereabouts of cranking befor starting/sputtering and
    then continuing fine. the only thing I've not checked so far is the fuel
    filter

    best wishes, guenter



  5. #5
    Tiger
    Guest

    Default Re: 1990 420SEL Starting Problem?

    You are right about vapor lock when engine is hot. In your case it is most
    likely to be the fuel accumulator that is leaking... easily checked by
    pulling out the rubber hose and if fuel keeps dripping out, it is bad.

    I suspect the same problem with the 420SEL... usually occurs when engine is
    hot... very hard start after 10 minutes (tThis however depends on how bad
    the accumulator is leaking)... In cold start, takes a bit longer to start.



  6. #6
    Roland Franzius
    Guest

    Default Re: 1990 420SEL Starting Problem?

    John Simpson schrieb:
    > This may sound trivial, but I'm getting nervous! The car has always started
    > within 1 second, hot or cold. I would guess on the first revolution after
    > engaging the starter. Lately, it cranks for a couple of seconds before
    > starting. It runs fine once it has started. It's got 180K miles on the
    > odometer. Plugs haven't been changed for years! Fuel pump relay was new
    > about 8 months ago.
    >
    > Any ideas? Fuel filter? Plugs? I'm paranoid?


    Smell at exhaust while cranking, look at the sparks after removing one
    plug and check compression. In this order.

    --

    Roland Franzius

  7. #7
    John Simpson
    Guest

    Default Re: 1990 420SEL Starting Problem?


    "Richard Sexton" <richard@news.vrx.net> wrote in message
    news:ed4v95$ibj$1@news.datemas.de...
    > In article <mRmJg.6389$SZ3.3982@dukeread04>,
    > John Simpson <jasimp@earthlink.net> wrote:
    >>This may sound trivial, but I'm getting nervous! The car has always
    >>started
    >>within 1 second, hot or cold. I would guess on the first revolution after
    >>engaging the starter. Lately, it cranks for a couple of seconds before
    >>starting. It runs fine once it has started. It's got 180K miles on the
    >>odometer. Plugs haven't been changed for years! Fuel pump relay was new
    >>about 8 months ago.
    >>
    >>Any ideas? Fuel filter? Plugs? I'm paranoid?

    >
    > Change the plugs. Wouldn't hurt to do all the filters too. Expect
    > a slight milage increase if you do.
    >
    >
    > --
    > Need Mercedes parts? http://parts.mbz.org
    > Richard Sexton | Mercedes stuff: http://mbz.org
    > 1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net


    Thanks for the reply.

    The air filter is new. How many fuel filters are there? Where are they
    located?

    John



    > 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net




  8. #8
    John Simpson
    Guest

    Default Re: 1990 420SEL Starting Problem?


    "Guenter Scholz" <scholz@sciborg.uwaterloo.ca> wrote in message
    news:ed56il$dr1$1@rumours.uwaterloo.ca...
    > In article <mRmJg.6389$SZ3.3982@dukeread04>,
    > John Simpson <jasimp@earthlink.net> wrote:
    >>This may sound trivial, but I'm getting nervous! The car has always
    >>started
    >>within 1 second, hot or cold. I would guess on the first revolution after
    >>engaging the starter. Lately, it cranks for a couple of seconds before
    >>starting. It runs fine once it has started. It's got 180K miles on the
    >>odometer. Plugs haven't been changed for years! Fuel pump relay was new
    >>about 8 months ago.
    >>
    >>Any ideas? Fuel filter? Plugs? I'm paranoid?
    >>

    > Hi John, my 89 300e started doing the same thing earlier this summer,
    > it has not gotten worse. I've changed plugs etc etc to no avail...
    > whereas
    > it used to start with a turn or two, it now takes 4 or 5 sec cranking and
    > once it starts everything is fine. Moreover, and this may be fortuitous,
    > this
    > is the first summer that the car apparently has suffered vapour lock - ie
    > it took over 5 min or thereabouts of cranking befor starting/sputtering
    > and
    > then continuing fine. the only thing I've not checked so far is the fuel
    > filter
    >
    > best wishes, guenter
    >
    >


    Thanks for the reply.

    I would suspect vapor lock, but it's the same cranking hot or cold.

    John



  9. #9
    John Simpson
    Guest

    Default Re: 1990 420SEL Starting Problem?


    "Roland Franzius" <roland.franzius@uos.de> wrote in message
    news:ed5vrl$htv$1@newsserver.rrzn.uni-hannover.de...
    > John Simpson schrieb:
    >> This may sound trivial, but I'm getting nervous! The car has always
    >> started within 1 second, hot or cold. I would guess on the first
    >> revolution after engaging the starter. Lately, it cranks for a couple of
    >> seconds before starting. It runs fine once it has started. It's got 180K
    >> miles on the odometer. Plugs haven't been changed for years! Fuel pump
    >> relay was new about 8 months ago.
    >>
    >> Any ideas? Fuel filter? Plugs? I'm paranoid?

    >
    > Smell at exhaust while cranking, look at the sparks after removing one
    > plug and check compression. In this order.
    >
    > --
    >
    > Roland Franzius


    Wouldn't a compression problem cause rough idling?

    John



  10. #10
    Tiger
    Guest

    Default Re: 1990 420SEL Starting Problem?

    I would change out the distributor cap... or at least clean the brass
    terminsals inside it... I kinda recall of this symptoms and it came up to
    the distributor cap.



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