Question about 1991 Mercedes-Benz 190

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I am having problems starting my car. I have already changed the distributor cap with a new one, replaced the rotor arm,changed the plugs and replaced the leads from the distributor. I still have the problem which is as follows, when I start the car in the morning I have to pump the excelerator quite a number of times just to keep it going. Somtimes there may be a small backfire but this doesn't happen on a regular basis. When the car is running for a while the problem seems to go. Can you give me some advise to what it may be? could it be a fuel pump pump problem or what?

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This sounds like a faulty fuel pressure regulator. It could also be a clogged fuel filter. I would replace the filter first, as it is good routine maintenance anyway, and then monitor the fuel pressure at the fuel rail on the engine. Many auto parts stores will rent you a tool for this. If the pressure is inconsistent, it is probably the regulator. If the pressure is significantly under 50 psi or rises gradually when the engine is off but the key is switched on, it is likely the fuel pump.

Posted on Nov 17, 2009

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Yes sounds like you have a fuel problem if you have to pump the excelerator.Check the fuel pump is working if so change the fuel filter.

Posted on Nov 17, 2009

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Check the oil level urgently, if it has been misfiring for some time you will have acuumulated all that unburnt petrol in the oil sump!!! (you can test this by getting a bit of oil from the dipstick and putting a drop on your fingers, rub together and sniff the oil, if it stinks of petrol change it -you need to change the oil filter too since it wil be full of petrol tainted oil also.
Once you are sure you have good oil and either it was ok after testing it from the distick "golden, clean oil" or you replaced the contaminated oil and filter you can move on to sorting out this misfire.
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for now I assume the coil checked out fine and gave a strong steady uniform set of sparks. ----------------------- With a fully functioning coil, you're left with the distributor cap and rotor arm - the distributor cap comes off with 2 screws at the left and right sides of the cap between the HT Connectors - unscrew them - (note the original orientation of the distributor cap before you pull it off to aid refitting) you can now pull away the cap from the rest of the distributor.
INSIDE the CAP there are four "poles" round the outside, and a spring mounted contact in the center - make sure the poles are clean and shiny with only light markings at most, if they are blackened, whitened ro rounded and pitted then replace the cap - ford dealers or local part shop, most shops will stock both the rotor arm and distributor cap for around £15-30 - phone around for the best deal.
Still on the distributor is the rotor arm, this pulls off - it has to be pulled dead straight off the distributor shaft - once you have the rotor arm off you can inspect the metal contact on the top for general dirtiness and decay, it "should" be shiny brass/copper in colour. if it looks pretty bad, pitted or blackened/burned- - get a new rotor arm from ford dealers or from local part shop (not expensive)
Once you are sure of a clean or new rotor arm and distributor cap you can try the engine again - hopefully the misfire is gone.
If it is still there....
we are here

DISTRIBUTOR CAP - FINE ROTOR ARM - FINE OIL + FILTER NOT OVER LEVEL + CLEAN, NO PETROL IN IT HT COIL - GOOD STRONG REGULAR SPARK. -----

If it still misfires with all these things in perfect order then you are left with: Clogged Fuel Line/Filter or Failing Fuel Pump or Ignition TIMING - ( 10-12 degrees BTDC) have igition timing checked and set if not correct. OR... Faulty Distributor - pretty much worst case scenario. Tell me how you get on - Often it is the distributor cap and rotor arm - If not I hope its the fuel filter!
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