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RPM's not raising when throttled down and not moving

Tiny
IMPACT12
  • MEMBER
  • 1999 MERCEDES BENZ CLK320
  • 6 CYL
  • AUTOMATIC
  • 230,000 MILES
The problem started with the car not starting. It was driven to market of which it refuse to start when done with market. After changing the fuel pump and fuel filter it started, but now when gas down no rpm movement.
i tried changing the gear to reverse or drive, it would stall immediately after the change and not move again. What can I do?
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Saturday, December 2nd, 2017 AT 11:12 PM

13 Replies

Tiny
STEVE W.
  • MECHANIC
  • 12,958 POSTS
Okay, you disconnected the battery to change the pump and such correct? Now it does not want to idle or move when you put it in gear?
That sounds like it needs the throttle body cleaned, then it needs to relearn idle in and out of gear. Disconnecting the battery erases all of the learned values. The computer then goes back to the baseline numbers. If the throttle body and idle control are dirty the baseline will not let it run because of the crud. So I would start with that, then start it and drive it around.
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Sunday, December 3rd, 2017 AT 6:23 PM
Tiny
IMPACT12
  • MEMBER
  • 7 POSTS
Thank you for your reply. How can I locate the throttle body, and also erase the learned values?
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Monday, December 4th, 2017 AT 2:20 AM
Tiny
STEVE W.
  • MECHANIC
  • 12,958 POSTS
Not to sound like I'm demeaning you but unless you have cleaned a few throttle bodies before I wouldn't want this to be the first. It is easy to damage one and this one is VERY expensive (over $2,000.00). I would say this is an instance where taking it to a shop and having them check it would be a prudent step.

Here is a guide on a much easier vehicle to give you an idea of the process.
https://www.2carpros.com/articles/throttle-actuator-service

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Monday, December 4th, 2017 AT 9:27 PM
Tiny
IMPACT12
  • MEMBER
  • 7 POSTS
Thank you Steve for the answer, that is for cars with injector, Clk320 1999 Doesn't have that injector, what do I do in this case
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Tuesday, December 5th, 2017 AT 3:41 AM
Tiny
STEVE W.
  • MECHANIC
  • 12,958 POSTS
Which engine do you have? Diesel or gas?
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Tuesday, December 5th, 2017 AT 11:56 AM
Tiny
IMPACT12
  • MEMBER
  • 7 POSTS
Petrol engine
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Tuesday, December 5th, 2017 AT 11:34 PM
Tiny
STEVE W.
  • MECHANIC
  • 12,958 POSTS
Then you have a throttle body and injectors. The one in the video was not your make/model, it was just to show how the throttle body can be gunked up and cleaned. Sorry if it was confusing.
Yours is M16/6 in these pictures. There isn't a video guide for that exact vehicle which is another reason I suggested taking it to a shop.
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Wednesday, December 6th, 2017 AT 10:14 AM
Tiny
IMPACT12
  • MEMBER
  • 7 POSTS
Thank you, Mr Steve, I was able to clean the throttle body, it was raising but not properly,
after changing the air flow meter it was better and sound. Am so grateful
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Friday, December 8th, 2017 AT 1:28 PM
Tiny
STEVE W.
  • MECHANIC
  • 12,958 POSTS
Good Job. Thank you for using 2CarPros. Com Come back anytime with your automotive questions.
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Friday, December 8th, 2017 AT 4:06 PM
Tiny
IMPACT12
  • MEMBER
  • 7 POSTS
It has gone back to the same issue, this time around I changed the throttle body is not yet responding, what can I do
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Monday, December 11th, 2017 AT 4:29 PM
Tiny
STEVE W.
  • MECHANIC
  • 12,958 POSTS
If changing the TB out didn't change things then the issue will be to watch the fuel pressure and ignition to see which is causing the problem. That may take some dealer level testing. Do you have a factory level scan tool to watch the fuel trims and timing vs engine loading and rpm?
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Friday, December 15th, 2017 AT 1:17 PM
Tiny
IMPACT12
  • MEMBER
  • 7 POSTS
The fuel pressure was tested, the pressure is perfect, The mechanic I called said it may be the brain box, I don't know. Don't have a factory level scan tool.
Comes on perfectly well.
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Saturday, December 16th, 2017 AT 12:12 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,861 POSTS
This car will go into limp mode if you have a vacuum leak somewhere in the intake system or intake tube. Here is a guide to help you confirm the issue.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please let us know what happens.

Cheers, Ken
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Sunday, December 17th, 2017 AT 4:35 PM

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