Re: Help - 450SL Hard starter

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
Reply to
rayeim
Wow! The original post has to be the oldest one so far. 19 years! Gmailers are really good at finding those antique posts.
Reply to
Paul in Houston TX

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