1998 W202 C240 Sport - answer a few ? please

maverick1984

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Evening,

At some point in the next month or two i am going to do / have a few things done to the car -

Oil and filter change
air filter
Pollen filter
Plugs
HT leads
Gearbox oil and filter
Clean the MAF or buy a new Bosch one.
Coolant change

But until then can you answer me some questions please regarding the running of my car.

When i first start her up she idles between 1300 - 1500 RPM. If i give it a bit of throttle it goes down to 1000 RPM then after a few minutes of driving it sits at a comfy 500/700RPM. What could be causing the initial high RPM?

For the first few minutes of driving the car does not seem to change up a gear when it should (it basically increases the revs later then i would expect) Currently driving around in "W" mode. What could be causing this?

The car has only had 1 "mis-fire" but since then it hasn't happened again.

Many thanks in advance.

Adam
 

rich.g.williams

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C200 CDI Avantgarde SE Auto May 2004 Sports Pack
assuming you start from cold it is normal for the engine rpm to be higher than usual until the engine is a little warmer

also gear changes are delayed until slightly higher rpm for the emissions catalyst to warm up fast

but your figure of 1300/1500 sounds a bit high, maybe there is something else wrong

reading any error codes may help, if the rpm were erratic then suspect the throttle position sensor otherwise coolant temp sensor
 

Captain_Pug

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C Class
My W202 also reves quites high when its cold before changing gear, usually 1st to 2nd. When its get warm this stops. I have had mine for three years and its always done this.

I got it checked by a well known auto gear box specialist in the area who checked the oil in the gear box and confirmed they do this and is nothing wrong and nothing to worry about. You normally need to go to a garage for checking the gearbox oil level as there is no built in dip stick like the engine oil.
 

television

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2002 SL500, 216 CL500, all fully loaded
That all sounds OK to me,it is running on a cold start valve till its warm,,the gearbox is normal too
 

star

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Cold idle sounds abit high, the throtle venturi might req cleaning and then reseting. Why change Ht leads, as proper ones are expensive. Get them checked with a scope and then only change the ones that are req'd.
 

stevesey

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C240 Sport 98
Idle and higher gear change points when cold are all perfectly normal.

I'd leave the MAF and leads alone, unless you have a problem. Similar with the plugs unless they need a change - interval is 60K (platinum tipped jobbies that will cost £60 a set so it's best to get the most of of them.

Got mine at 100K and did change most of the fluids in the first few months - you missed diff oil change, brake fluid and power steering fluid from your list (if nothing if wrong I'd do these before plugs, MAf etc).

EDIT: Ah I see from your other posts you did have a issue last week - any re-occurance of the situation?
 
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maverick1984

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Evening all

Many thanks to all your replies - puts my mind at rest.

I have had no re-accurance of my "mis-fire" and i hope it stays that way.
 

Stu_CDX

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I can confirm that idle speeds seem correct.

My E280 starts at 1250-1300 then drops to 1000 and then 600-800 (Depending on temperature)

A lot of automatics have the programming to heat the cat up... Normally to keep it in second gear until 3500 rpm...

A feature I hate as I detest the idea of revving the engine too much when it's cold!
 

wireman

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nice 201 2.5D 1993 & very nice 129 SL500 1994
'Tis better that the engine operates at lower torque and higher revs when cold than t'other way round, this keeps high sliding surface loads lowest and will give longer engine life.

The engine oil (I am told) benefits from the car being driven as soon as its started and not being left to warm up on tick over.

If you change your plug leads make sure that they are of similar electrical characteristics as the original type, wire leads or so called sports leads have advantages with a suitable ignition system but with a standard factory set up the suppressor leads are matched to the coil etc and are important in ensuring good efficient operation of the engine under road conditions.

The most important fluids to change are the brake fluid and antifreeze. When aged both offer little corrosion protection, 2 years old MAX.
 


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