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Car Forum / Mercedes-Benz Cars / September 20061990 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. > 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 [quoted text clipped - 8 lines] > > John S. Plugs >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 [quoted text clipped - 4 lines] > >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.  SignatureNeed 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 >>This may sound trivial, but I'm getting nervous! The car has always >>started [quoted text clipped - 8 lines] > Change the plugs. Wouldn't hurt to do all the filters too. Expect > a slight milage increase if you do. 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 >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 [quoted text clipped - 4 lines] > >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 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. >>This may sound trivial, but I'm getting nervous! The car has always >>started [quoted text clipped - 19 lines] > > best wishes, guenter Thanks for the reply. I would suspect vapor lock, but it's the same cranking hot or cold. John 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. 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 [quoted text clipped - 4 lines] > > 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. SignatureRoland Franzius > John Simpson schrieb: >> This may sound trivial, but I'm getting nervous! The car has always [quoted text clipped - 8 lines] > Smell at exhaust while cranking, look at the sparks after removing one > plug and check compression. In this order. Wouldn't a compression problem cause rough idling? John John Simpson schrieb: >> John Simpson schrieb: >>> This may sound trivial, but I'm getting nervous! The car has always [quoted text clipped - 9 lines] > > Wouldn't a compression problem cause rough idling? Mostly not if all cylinders are equally low. A single low compression cylinder wouldn't cause starting problems except the case an intake valve is blowing. If fuel delivery, spark plugs, resistances, cables, distributor, coil are OK one is looking for worn cylinders and valves. SignatureRoland Franzius |
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