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Help - 450SL Hard starter
On Tuesday, October 3, 2000 at 12:00:00 AM UTC-7, RD Thompson wrote:
> I have a Mercedes '78 450SL with CIS fuel injection that has spent > more time sitting than driving (which is part of the problem, I > presume). > > Anyway, my problem is hard starting when it is hot. When the car is > cold it starts with no problem.. Just cranks a bit and fires off. > When it is hot and you let it sit for more than a few minutes, it has > to crank a long time before it will start and run. It gives a short > burst as soon as you try it, but it is not enough to sustain it. > After that initial burst, you need to crank a long time. (Thank God, > or whoever, for good batteries). Lately, it seems to give a aarrgh > aarrgh type of noise out of the engine compartment for a few seconds > after it is shut off, but it does not last long enough for me to pin > down where it is coming from although it does seem to come from the > passenger side of the engine compartment. > > I think my problem is a dropping of the fuel pressure (I have no gauge > way of measuring it) which lets the fuel drain out of the lines and > then it vapor locks leaving me to crank on the starter until the fuel > pump can overcome that vapor lock. > > I have replaced the fuel pump and fuel filter.....no change....the > pressure regulator in the fuel distributor...no change and put new O > rings in the injectors.....ditto. > > My next attack will be on the cold start valve although cold(?) > starting is fine. Also, do the injectors maintain pressure at the > injector itself or is it at the fuel distributor? > > What I need to know is if I am on the right track and if anyone has > any other ideas. Parts replacement at a hundred bucks or more for > each part sucks. > > Except for the warm hard starting problem, the car is a joy to drive > and really has comparatively few miles on it. > > > Thanks in advance. > > RD |
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Help - 450SL Hard starter
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