6speedmanual
New Member
- Joined
- Nov 3, 2007
- Messages
- 5
- Reaction score
- 0
Hi All
On here to ask for some advice.
My car is a:-
Year 2000
S202
C200 PETROL
5speed TipShift AUTOMATIC.
93000 miles
Full service history. Had a B service at 81000 and an A service at 92000.
Very recently <1 week ago, it has developed an odd problem.
It starts from cold fine.
When driving away, it pulls away ok but feels slightly sluggish. It then seems reluctant to change up through the box, but it does eventually go up the gears to 3rd. Then it seems to be limited to 4000rpm and stays in 3rd gear. It feels as if some default/safe mode has cut in.
If I then slow down and stop the car the engine starts to judder (1 mile and about 3 minutes after setting off). (This feels as bit like the judder you would get if one tries to pull away in too high a gear in a manual) However, the revs are still at normal tickover speed c 800rpm.
If the gear selector is then moved to Neutral or Park, the juddering continues. This suggests that the juddering is not caused by the gearbox as there is no drive load on the engine.
Gently increasing engine speed with the accelerator pedal does not seem to clear the judder and the engine feels slow to rev up relative to what would be expected from a prod on the accelerator pedal.
If the engine is then turned OFF and restarted (say) 10 seconds later, the problem has disappeared and the car drives with its normal performance with lively acceleration (relative term as this is a C200) and changes up through the gears normally.
I feel this is some issue with the warm up cycle of the engine and when some parameters are wrong, the ecu is holding back the car's performance.
Can anyone make any suggestions if my initial belief that it lies in the engine management or sensors? Where I should start to look for the cause of this problem and go about fixing it?
I am a competent mechanic at tacking any work but my brain cannot form a telepathic link with a Merc control module:roll:
I look forward to replies.
6sm
On here to ask for some advice.
My car is a:-
Year 2000
S202
C200 PETROL
5speed TipShift AUTOMATIC.
93000 miles
Full service history. Had a B service at 81000 and an A service at 92000.
Very recently <1 week ago, it has developed an odd problem.
It starts from cold fine.
When driving away, it pulls away ok but feels slightly sluggish. It then seems reluctant to change up through the box, but it does eventually go up the gears to 3rd. Then it seems to be limited to 4000rpm and stays in 3rd gear. It feels as if some default/safe mode has cut in.
If I then slow down and stop the car the engine starts to judder (1 mile and about 3 minutes after setting off). (This feels as bit like the judder you would get if one tries to pull away in too high a gear in a manual) However, the revs are still at normal tickover speed c 800rpm.
If the gear selector is then moved to Neutral or Park, the juddering continues. This suggests that the juddering is not caused by the gearbox as there is no drive load on the engine.
Gently increasing engine speed with the accelerator pedal does not seem to clear the judder and the engine feels slow to rev up relative to what would be expected from a prod on the accelerator pedal.
If the engine is then turned OFF and restarted (say) 10 seconds later, the problem has disappeared and the car drives with its normal performance with lively acceleration (relative term as this is a C200) and changes up through the gears normally.
I feel this is some issue with the warm up cycle of the engine and when some parameters are wrong, the ecu is holding back the car's performance.
Can anyone make any suggestions if my initial belief that it lies in the engine management or sensors? Where I should start to look for the cause of this problem and go about fixing it?
I am a competent mechanic at tacking any work but my brain cannot form a telepathic link with a Merc control module:roll:
I look forward to replies.
6sm
Last edited:
