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-   -   Help - 450SL Hard starter (http://www.autobanter.com/showthread.php?t=441952)

[email protected] April 3rd 19 06:32 AM
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

Paul in Houston TX[_2_] April 4th 19 01:59 AM
Help - 450SL Hard starter
 
wrote:
> 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

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


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