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Accelerator response at low revs - car tends to bounce; 2L 190D - is kangaroo-like behaviour normal at low revs?
Topic Started: Fri Mar 12, 2010 11:22 pm (2,876 Views)
Rog
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Hi there,

I've had a good trawl through the forum looking for information on accelerator response and haven't found anything that quite matches what I (or rather my girlfriend) is experiencing...

When I first got my 190 (three years ago) I found it really difficult to drive smoothly - at the top of the peddle and at fairly low revs, when accelerating or decelerating, the car would tend to 'jump', much like it would if you messed up a gear change.

Anyway, I got used to it and don't even notice it any more. However, my significant other finds the car impossible to drive due to its 'jumpy' nature, as do a few of my friends.

I understand from previous topics that it is not unusual to have a sluggish response at the high end of the pedal, but what about an uneven bouncy response?

Is this just the way they are or is a spot of troubleshooting in order?

Thanks all.
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alogaparaloga
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crazy mind
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Is this just the way they are?
I bet that's a NO, we speak about MB smoothness

Does the bouncing changes after a service?

Whenever I had engines, petrol or diesel, with jerky behaviour, I was always trying first cleaning agents for the fuel, new filters for air and fuel, and then watching for a period of time.

Try 2-3 tanks of fuel with diesel cleaning additive but first change filters if you haven't done recently.

some other members with diesels may have the right answer for you
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Ukmerctechie
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AKR system is faulty or worn prop donuts.
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nezamr
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i would suggest:

1. change gearbox filter and fluid
2. change fuel filters
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Ukmerctechie
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I think this one is a manual?????
The 190d is fitted with either an electronic Antijerk system(AKR).or a mechanical system to combat this exact problem.
You will probably find either a stuck solenoid on the electronic or a popped damper on the mechanical version(depending on which system you have)Move your throttle linkage by hand and see how quickly it returns,it should go back steadily and at moderate speed.If it flies back you have a knackered damper.
(About £30)
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Rog
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Thanks guys - some helpful stuff there.

OK. I've kept up on the filter changes - there's a fairly new air filter, fuel filter and inline fuel filter (took me a while to discover this guy – thank you Haynes - it was seriously congested when I changed it). I also had a fairly major service done about six months ago - rear prop coupling, rear shocks and rear bushes.

I put a bottle of Comma diesel magic in the tank yesterday, I'll put another bottle through at the next fill and see if there's any difference.

Sorry, should have said it's a manual (though as an aside, I will change the gearbox oil next weekend - hasn't ever been done during my ownership).

I was not familiar with the AKR - sounds very likely given the symptoms. The car does actually drive beautifully when cruising, though my other half reckons I'm compensating for jerky acceleration by riding the clutch, and she may very well be right (first time for everything, eh!).

Uk merc techie, She's a 92 (car, not girlfriend) - likely to be an electronic AKR? I'll do a bit more prodding around under the bonnet in the morning. I downloaded the workshop manual – I'll dig into it and see what I can find out about the AKR.

Again, thanks for the help. - Will report back.
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Everton
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I know what you mean straight away, I've had two auto 190's and they were really smooth. But, you need to get control over a manual 190, they pull away differently, you need to be smooth in your gear change from 1st to 2nd, otherwise you get a judder, the judder makes you look like you cant drive. I'm not sure if its a fault, but I've had the judder on all of my three manual 190's, if you dont tap the revs perfectly upon pulling away, it judders and f*cks up the pull completely
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Everton
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I dont mean they pull away differently, as in, auto to manual, I mean, they pull away differently to any other manual I've drove. You need to be smooth with your action
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Rog
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Well I started to rummage around under the bonnet. Don't know if it could be adding to problems, but my accelerator cable was banjaxed. The wire is OK, but there is a threaded plastic fitting (the first bit of plastic on the cable after it loops around from the bulkhead back towards the throttle) that is broken, so the cable generally flops about the place and rests on the manifold (please excuse my technical language).

I've ordered a new cable (couldn't source one in Dublin!) so I'll stick that in before going any further.

I also noticed (and rectified) that the fuel line closest to the manifold was out of its clips and resting against the manifold. I'm guessing an injector was changed at some stage and the line popped back in sans clips.

If it stops raining, I'll stick up a pic of accelerator cable.
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cosser
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Is it still raining ..??
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Rog
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Cats and Dogs
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kentronix
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I'm only really here for the Kitchens

I am not sure if its the same issue but you used the term bouncy so I thought I would mention it. My brothers 2.5d has this odd effect where if you accelerate quite hard it acts as though your getting a tow from an elastic band. Very strange feeling indeed. I have checked most areas and are now starting to think it may be the dual mass flywheel. So we are ignoring it :)
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CrysAk
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might be worth cleaning the injectors and changing spark plugs, sounds like its not getting the correct AF mixture or is detonating incorrectly

Edited by CrysAk, Wed Mar 24, 2010 12:23 pm.
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Uk Merc Man
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190e Leg-End
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CrysAk
Wed Mar 24, 2010 12:22 pm
might be worth cleaning the injectors and changing spark plugs, sounds like its not getting the correct AF mixture or is detonating incorrectly

its a diesel :P
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CrysAk
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Uk Merc Man
Wed Mar 24, 2010 1:41 pm
CrysAk
Wed Mar 24, 2010 12:22 pm
might be worth cleaning the injectors and changing spark plugs, sounds like its not getting the correct AF mixture or is detonating incorrectly

its a diesel :P
.... oh
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highwayman
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Are you sure all cylinders are firing?
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Rog
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I don't have any problems under hard acceleration, just at low revs, say when moving off from a light or existing off a roundabout. Here's a picture of where my accelerator cable is broken - sorry the pic is so bad - taken in a dark garage, camera in one hand and cable in the other. You can see in the second pic how the cable is, err, flaccid and lying on the manifold.

I should have a new cable arriving in the next day or two. Will be interesting to see if there is any difference. Also have a fuel sender unit on its way - will be nice not to have to use the Odometer fuel gauge anymore.

Posted Image

Posted Image
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stuu
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I have the exact same problem ('92 190e 2.0L M), the car shutters in low revs (not all the time) and does it when changing gear. My accelerator cable is fine. Do the 190e's have the AKR?
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Ukmerctechie
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Only diesels have the AKr system.
Have you checked the damper on the linkage yet?
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Rog
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Hi,

UKmerctechie, I did the throttle linkage check you suggested - sure enough it fired back into place like a catapult. However, I haven't been able to figure out if I have an electronic or mechanically managed AKR.

According to my Haynes manual there are two forms of anti-jerk system, depending on whether you have ELR idle speed control or Pneumatic idle speed control.

If I'm interpreting the manual correctly, the control unit for both systems is behind the false bulkhead with the electronic unit using a solenoid located on the upper part of the back of the injection pump and the pneumatic unit having something similar but on the lower part of the injection pump.

Have I got this right? I have looked for said solenoids but to my shame have not been able to locate them. Have you any hints on how I might ascertain which system the car has?

Just to add, this is an incredibly useful and well laid out site – has saved me a small fortune on mechanics.
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Rog
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Finally had a good look around the injection pump - I'm 99.9% sure the car has a mechanical damper system on the throttle and that the damper is gone (when I operate the throttle and watch what I believe to be the damper there is absolutely no resistance on it).

UKMercTechie, do you happen to know the part number of the damper? Also, is it tricky to replace?

Any advice very much appreciated, Cheers, Rog
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