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Tightening or Improving Throttle Response; Pedal was travelling half way before response
Topic Started: Mon Jan 19, 2015 8:26 pm (2,248 Views)
Gwilym
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:o I've just adjusted, or tightened, my throttle cable at a screw adjustment in the foot well I just found. :o

I have a 1988 190E 2.0l.

This adjustment has improved massively the delay between depressing pedal and Rev pick up but now I'm concerned I missed something at the other end of the throttle cable, in the engine bay?

I couldn't see a screw adjustment there, just a spring, but I'll check again tomorrow as one illustration on a similar topic on this site does show a screw adjustment in the engine bay.

Although the Rev pickup is good with mine now, in the other thread one member said this:

"Yep a bit of play is normal on that model - it doesn't seem to be there on a 16v though.

You can remove it by adjusting the pedal down underneath the steering wheel. However when you do this the accelerator won't return to it's full 'off' position. Therefore the deceleration shutoff switch won't activate and your fuel consumption will be slightly higher."
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eagle3
Therapy Needed
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Quote:
 
You can remove it by adjusting the pedal down underneath the steering wheel. However when you do this the accelerator won't return to it's full 'off' position. Therefore the deceleration shutoff switch won't activate and your fuel consumption will be slightly higher."


You would also lose the engine brake going down hill..can be dangerous.
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Gwilym
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Under what circumstances would the car not engage a gear going down hill? feckknows

Mine definitely stays in gear and therefore retards acceleration when I lift off the pedal. However, the throttle metal bit is a hell of a long way from coming in to contact with, what I assume to be, the cut off switch. Described in the quote I gave from another topic.

Does the 'deceleration cut off switch' do what it is called?...i.e. Remove deceleration?...seems weird if that's dangerous feckknows

Or...did the person who spoke about a 'deceleration cut off switch' mean a fuel cut off switch?........update, I've just 'googled' and think this is what it's called:

Mercedes Benz A 0025456814 Fuel Injection Throttle Micro Switch
Edited by Gwilym, Tue Jan 20, 2015 5:21 pm.
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eagle3
Therapy Needed
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The fuel is cut off above 1300 rpm when you take your foot off. But injectors get some juice below 1300 rpm to stop the engine stalling.

Where did I say the car wouldn't engage gear?
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Gwilym
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Sorry I'm not very knowledgeable and probably miss understood what you said. :blink:

Anyone got a procedure for setting the throttle cable so this micro switch is engaged properly?
Edited by Gwilym, Tue Jan 20, 2015 5:25 pm.
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eagle3
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What speed is the engine idling at (rpm)?
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Gwilym
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It sits beautifully at about 800rpm.

Just found this:

"The switch is the micro switch for idling control. At idle, the switch must be activated(the linkage MUST push TIGHT against the black roller of the switch)."

Mine is quite a way from touching the switch roller so do I have to wind the throttle cable out, at the screw adjustment on the throttle arm, untill the micro switch fully switches then adjust the screw by the pedal below steering wheel if I still have too much pedal travel before getting revs?

As stated earlier I started this process by removing the useless pedal travel, and I did this by only adjusting the throttle cable adjustment down by the pedal.
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eagle3
Therapy Needed
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Have you done anything to the cable at the throttle body end? That is where I would start.

You shouldn't need to mess with it at the pedal(as far as I know) unless of course somebody else has been playing with it.
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Gwilym
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Thanks. :)

Does the micro switch need to be fully depressed by the throttle arm at idle?...if so I will go back to square one and start with that.

Before I adjusted anything there was too much free travel on the gas pedal but, also, there was a gap of about half inch between the throttle arm and micro switch. So the micro switch wasn't engaged at idle either.
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Big Ben
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Sneaky 2.5-16 Driver!
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Gwilym
Tue Jan 20, 2015 6:36 pm
Thanks. :)

Does the micro switch need to be fully depressed by the throttle arm at idle?...if so I will go back to square one and start with that.

Before I adjusted anything there was too much free travel on the gas pedal but, also, there was a gap of about half inch between the throttle arm and micro switch. So the micro switch wasn't engaged at idle either.
To answer your question, yes the micro switch should close fully, the cable should have a small amount of play in it to make sure this happens every time you take your foot off the accelerator pedal. The linkage seems to be affected by temperature and on mine it needed to be adjusted winter and summer! Can you post a picture of the micro switch area and the linkage? Your fault description is typical of a broken spring on the linkage!

By the way, a bit of play in the take up of the throttle cable is quite normal on these cars and they all had it when new!
Edited by Big Ben, Tue Jan 20, 2015 11:25 pm.
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Gwilym
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Posted Image

Here it is. I have wound back the throttle adjustment by the gas pedal below steering wheel so that the micro switch is fully depressed again with foot off the gas. So I'm back at square one before I adjusted anything.

But I really don't like the amount of pedal I have to travel before revs pick up! :(

I have tried adjusting the throttle cable at the screw just out of shot to the right of this image, and at the foot well, but I can't reduce the excessive pedal travel while also making sure the micro switch engages.

The pedal is travelling a few inches before revs pick up, then it feels as though I can't fully used all available throttle by the time I've fully depressed the pedal.

lmao lmao ;) I'VE JUST FIGURED best way to adjust this for minimum pedal travel while also ensuring the micro switch is fully depressed when foot off the gas. Please tell me if this not the correct procedure but it seems to have worked for me and has revitalised throttle response!

Rotate throttle cable screw adjustment at gas pedal anti clockwise until throttle arm moves away from micro switch. Then wind out throttle screw adjustment at throttle arm until micro switch engages. Repeat this and you will find that gas pedal travel, before revs engage, shortens! rockon
Edited by Gwilym, Fri Jan 23, 2015 3:55 pm.
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