300sel using too much gas

[youngil006]

Hi
I have a 1988 300 sel mercedes benz, and it uses way too much fuel. It used to get 400 or so miles to the tank...now it goes about half or less. These are the symptoms:
1-start to engine with no need to push down the gas pedel
2-put in drive, push down gas pedel no respose until i push it down all the way to the floor... car hesitates, then engine revs hi then i get pushed back into my seat, the the car takes off like a bat out of hell, black smoke leaves the pipes. when on high way car runs ok, but has very strong gas smell.
3-when in idel car economy meter stays in the middle, never gets lower until i put it in park.
is there anyone out there with some mercedes knowldege?? my wallet is getting lighter every day paying for gas.
thanks
*young006

 

[Mikesmerc]

Could the cold start injector be at fault, in other words staying permently on making for rich running. You could try disconnecting the plug from the top of the injector and see if there is an improvement. It should only activate on cold starts.
Mike

 

[sooper coop]

I have treated my 300 to its second bottle of Injector Cleaner and there is a very noticeable improvement in mpg.

your injectors are definitely fouled up whatever. its a cheap way to start the diagnosis

 

[MondeoMan]

The symptoms suggest it's running very rich all the time (which would probably rule out a problem with the cold start). I suppose you've checked the condition of the air filter? Air flow meter problem?

 

[mlc]

this is strange - i thought I posted on this before work today !


you are describing a blocked air filter (just as my learned friend MondeoMan says). Either the filter is blocked or you have picked something up in the intake piping.

But what do I know, I only drive a Mondeo

Mark.

 

[SLinKyjoe]

Special Ford Section created just for those who need it.

http://forums.mercedesclub.org.uk/showthread.php?p=52009#post52009


thats how good our Merc forum is. We even cater for all makes on here. now what other forum does that for their members eh?

 

[MondeoMan]

Why? Are there not enough Ford forums out there?

I don't drive a Mondeo incidentally, perhaps I should change my name. Can I have 'Cuddles' please?