Mercedes-Benz Forum banner

1 - 7 of 7 Posts

·
Registered
Joined
·
6 Posts
Discussion Starter #1
My 1998 E300TD W210 has started to loose power when running.
From cold it will run OK up to 40mph, then after 3 to 4 minutes, the engine will drop revs to 500 rpm, sometimes stop totally. If it keeps running it will slowley climb in rev's/power to normal. This will repeat every 2 to 3 minutes. My mechanic mate has looked at it but the tempermental bastard engine decided to run like a dream that day (it was already hot when I got to his garage). He looked at the fule lines - OK, turbo connections - OK, suggested dirty fuel. The next day, same thing, power breaks up, every few minutes. When it happens I can shove the pedel to the floor and absolutely nothing happens - very strange.
There is also an audible "whirring" sound coming from the front left under the bonnent (not the turbo side) when I put the foot down. This is a new sound which I think is related to the problem.
I and thinking it has got to be air getting in the fuel, blocked fuel filter or something, what else can go wrong with a diesel?[:(]
 

·
Registered
Joined
·
4,115 Posts
Sounds to me like your Air flow sensor has packed in. Best advice is to get a new one (but only if it is trully dead), never get a slightly used one form a scrap yard (works out to be more expensive in the long run).

Those sensors are very expensive so do shop around (prices vary dealer to dealer).

Hope your car gets sorted out soon.
 

·
Registered
Joined
·
180 Posts
I'm sorry I don't know the name of the part. Mine is not here to look at right now but on the left front of the engine (just in front of the IP, I THINK) is a fuel system component. I don't know what function it serves. It has numerous lines coming out of it. When mine failed, the dealer mech said it was because of diesel fuel changing since the car was produced. I have a thirty five year old Camaro and it hasn't had a problem with fuel changes. Anyway, the symptoms were exactly as you describe. The cost for them to change was about $350 IIRC.
 

·
Registered
Joined
·
262 Posts
Possible Air in Fuel System--- Bleed out the air off the system...Try this first before going into more complicated possibilities
 

·
Registered
Joined
·
6 Posts
Discussion Starter #5
Just an update. The mechanic now trying to solve the problem has run out of ideas. He does not think it is the filter, air flow sensor, EGR or air in the line. He thinks it is a ECU problem, and is trying to "capture" the fault report. At this stage I'll need a second car just to run around in while this is being fixed.[:(]
 

·
Registered
Joined
·
6 Posts
Discussion Starter #6
It's all fixed!!!

After limping the beast to my usual mechanic - only for it to behave OK for him, then taking it to a "Merc specialist" only for him to rub his chin and suggest it's would be "the black box - cost, a couple of grand" I took it to a diesel specialist. They found leaks at the fuel filter and lift pump, plus other O-rings that had been deformed over the years. They replaced all O-rings in the fuel line. It runs like a dream now.
I have come to the conclusion that living in Australia, where almost all cars (even brand new ones) are petrol (not the same tax exemption on diesel here as in the UK), if you have a problem with a diesel car it's best to track down a good diesel engine bloke and take it to him, you're wasting your time with the petrol-heads.

So, maybe I won't get rid of the old girl after all!

Thanks for your help. Cheers
 
1 - 7 of 7 Posts
Top