Engine hesitation

[Dragon]

It getting noticeable. I have a 2001 slk 200K. After I negotiated a three quarter turn on a roundabout, it seemed the engine missed a beat. It fuel injection right not those old fashion carburetor.

What the likely I need to look into it to rectify it?

I know the fuel filter is long overdue 50K miles from new, is this the reason?

I changed the spark plugs at the beginning of this year, should I take it out and have a look at it?

What else? Any suggestion?

 

[c240yaz]

Mas ? If it was the fuel filter, the vacuum problem would be there all the time, not just when on a roundabout or accelerating.

However, at 50k miles, the filter is due a change, mine was caked black at 60K, although I do not think that this is your initial problem. Euro car parts Hengst is much cheaper than MB, and is the same filter.

Changing the filter is tricky. You can get wet with petrol, Be carefull.

 

[Dragon]

Mas ? If it was the fuel filter, the vacuum problem would be there all the time, not just when on a roundabout or accelerating.

However, at 50k miles, the filter is due a change, mine was caked black at 60K, although I do not think that this is your initial problem. Euro car parts Hengst is much cheaper than MB, and is the same filter.

Changing the filter is tricky. You can get wet with petrol, Be carefull.

Cleaned the MAS earlier this year. Bought the 4 tubes filter from Merc for £70, tried to change it without success that why thinking of taking it to the garage to get it done. It looks like the petrol supply disrupted during slight roll to the side during cornering around the roundabout.

Nobody had this experience? I don't believe it.

 

[wemorgan]

A loss in air pressure may be effecting the turbo. Check the pipes for any obvious leaks, though normally just a pin hole is enough, which is very difficult to find.
I'd also check the throttle body to make sure it is clean and able to move freely.
Otherwise it sounds like you need to take it to a garage to have the error codes read.

 

[Dieselman]

Does it do this after left hand bends as well, or only right hand ones..or only roundabouts.
Firstly run some injector cleaner through the system as coked up intake valves can cause hesitation when first calling for fuel as can clogged injectors.
As said by webmorgan check the throttle body, vacuum pipes, intake boost pipes from the supercharger, then lastly have the codes read and live data from the lambda sensor and any other that can be.

I can't see it being the filter, but as you have it change it...but be careful..otherwise you might become literally Fiery Dragon..

 

[Dragon]

A loss in air pressure may be effecting the turbo. Check the pipes for any obvious leaks, though normally just a pin hole is enough, which is very difficult to find.
I'd also check the throttle body to make sure it is clean and able to move freely.
Otherwise it sounds like you need to take it to a garage to have the error codes read.

Thanks, it could be the culprit, yes I did dismantled the plastic tubes and clean inside, maybe I didn't tighten the tubes back. But why does it happened only when it rolled slightly sideway negotiating a 3/4 turn at a roundabout?

The error code is blank.

 

[Dragon]

Mas ? If it was the fuel filter, the vacuum problem would be there all the time, not just when on a roundabout or accelerating.

However, at 50k miles, the filter is due a change, mine was caked black at 60K, although I do not think that this is your initial problem. Euro car parts Hengst is much cheaper than MB, and is the same filter.

Changing the filter is tricky. You can get wet with petrol, Be carefull.

Got the fuel filter changed yesterday. Brought back the old filter. Being curious how things work, how do I open up the filter to see whether it caked black? Do I use a hack saw or a stanley knife to cut it thru?

Reviewed the compressor, nothing much to do to make it more air tight, it already air tight.

 

[Dieselman]

Just hacksaw it open then withdraw the filter.

 

[Dragon]

Hack out the £70 fuel filter. It cleaner on the inside than outside of the paper filter, so it should be valid for another 50,000 miles but there black deposit looks like carbon coming from the charcoal canister presumably flow back from the canister.