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Possible w124 problem

Howard

MB Club Veteran
Joined
Apr 23, 2004
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Toad Hall
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2018 C63 Wagon / CLK430 / A150 / VW Pink Floyd Golf Cabriolet
Hi Gang,

As you all know, i have a 1991 230ce w124 auto....

Just got back from a week away on Lundy (www.lundyisland.co.uk) but i digress....

On the way back , down the very steep country lanes , wet and muddy too, i had a strange problem with the car ....

The only way i can describe what was happening , it was like having a manual car with a slipping clutch that was suddenly biting properly every now and then ..... the engine would rev freely , almost like there was very little load, like being in neutral but still providing 'some' drive .....

Then when it would decide to change up, it would do it with quite a large clunk from the rear .....

Once before it has done this, in Cornwall, same situation , steep roads, heavy rain....

Once we were out of the country lanes, it didn't do it again , and performed faultlessly for the remaining 200 miles home in the pouring rain, including some quite steep hills on the a303.. It's almost like when it's warm , it sorts itself out ....

Its only done it twice since i have had the car (3 years) , but its bloody nerve wracking when you are on single track muddy roads, and you are afraid of a breakdown. I have checked the ATF fluid thing ( the cap under the bonnet that sort of locks down ) and the fluid isn't brown or burnt so i presume the gearbox oil isn't slipping ...

Any ideas would be very much appreciated, should i worry ? It just makes me nervous about taking the car anywhere ....

Thanks all in advance ....
 
Last edited:
You say the oil isn't burnt etc but is it all there? Check the oil when the trans is hot the car is left to stand for 5 mins and the engine is running.
 
Wicked, will do Ian ......

Are you thinking that it might be low on oil ? why should i check it after it is hot ? surely the oil will expand when hot and give a higher reading ?

I don't doubt you Ian, just keen to learn ... you know me ..... ;)
 
Checking the oil when it is hot makes sure that all caveties within the trans are full and that the torque convertor has spun the oil around the vanes. There are two marks on your dipstick, the lower mark is cold and the upper mark is hot. IT MUST ALWAYS BE CHECKED HOT, even the haynes manual says this
 
Will check tomorrow and report back Cap'n ......
 
Right, been out in the cold light of day , not the twilight of some godforsaken country lane and .....

The ATF fluid is a slightly reddy colour, but still clear .... not brown, no flecks, and doesn't smell burnt ...

However, with reference to the two marks that Ian mentioned, the car has been sitting overnight and the ATF level is approx 1 1/2 inches above the top mark :eek: ....

Hmmmm ... can it be too full ? would that cause the symptos described above ?

I'm gonna go for a spin in a while, once the rain eases off and will report back on the warm level ...

Any ideas team ?
 
whilst on this I have a question... Ive bought myself a flexible dipstick for the "sealed gearboxes", but it doesnt go down all the way, do i measure from when it wont go in anymore?!
 
jaymanek said:
was the car running and in neutral when checked??


Doh .....

Short answer ....... no

It was off and in park ...... i'll go and look again ...... :o
 
Ok, just checked ....

With car running and in neutral (after a quick drive round the block) .... the fluid comes to pretty much bang on the bottom mark on the dipstick .....

Good ?
 
no, u need some fluid if the car is warm... atf available from almost any petrol station...

pour it slowly down the dipstick hole and keep checking... it takes a while to register so give it a few minutes to get down there when checking..
 
Cool.....

Thanks for the advice so far guys ...... I should add that the car wasn't at normal operating temperature ( 80 deg or so ) , but i had had a quick mooch round the block first .....

Does it matter if you have driven 1 mile or 100 when you check it ? does it take miles to get everything mixed or just a short trip ?

I'll pick up some ATF tomorrow , if the other mark is for when it is cold, how come it was so much over it when it had been parked all night ?

EDIT :- I don't need special 'Mercedes' ATF :rolleyes: do I ? , or just any ATF i can get hold of ?
 
Dexron III will be ok in your box and a 10 mile drive though town is about right for temp.
 
Oooops , perhaps i'll have a sunday drive ( with my flat cap on ;) ) tomorrow morning, and then check it .....

Cheers Ian and Jay !!

:bannana:
 
Howard, are you still hiding :D :rolleyes:
 
jaymanek said:
whilst on this I have a question... Ive bought myself a flexible dipstick for the "sealed gearboxes", but it doesnt go down all the way, do i measure from when it wont go in anymore?!

Push it in until the plastic stick contacts the bottom of the sump. There will be about a foot of coil sticking out.
 
yep thats what i get... good, thought i was being thick... looks like a well known MB specialist have over filled an E270 CDI that i have had in..... it was doing funny gearc changes when not needed... looked at the history and gear box oil was changed 1000 miles ago... there is way too much..
 
I'm not sure what Ian thinks of this :) , but could it be that the control pressure cable, that goes from the linkage on the side of the throttle housing, might need a little adjustment? Or am I talking rubbish?
 
Just a quick update .....

Dipped it again after a short run , in neutral , car running and it's fine , right bang on the money....

No burning of the oil or anything . Standing on the brakes and then applying throttle manages to get the rear wheels to break traction , so it's not slipping ....

Guess i'll have to put it down to JOOTT .....

To be fair, its only done it twice in 3 years and each time only for about 2 minutes each time , so perhaps i am just worrying about nothing.... its an old car ...
 
John Sweeney said:
I'm not sure what Ian thinks of this :) , but could it be that the control pressure cable, that goes from the linkage on the side of the throttle housing, might need a little adjustment? Or am I talking rubbish?
No you are not. I may be a case of it momentarily sticking. Possible but not likely
 

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