Acceleration Issue
Thread Starter
Member
Joined: Dec 2002
Posts: 136
Likes: 0
From: Northern Virginia
2002 S-430
Acceleration Issue
Guys I have a 1998 C-230 with about 140k miles. I am currently experience a problem where the car has does not shift properly.
For example....if I am cruising along at about 40 mph and need to speed up, I will "floor it" where I would anticipate the car to downshift to speed up. However when I do this, the rpm's go up but the car does not down shift, rather it jerks and gets "stuck" to the point it slows down to almost stalling. As I ease of the accelerator, the car finally downshifts but at this point its to pick up speed that I lost during transition phase. Any ideas? Nothing is coming up when the codes are pulled.
I have also noticed that when I drive the car from a cold start the samething happens from 1st to 2nd if I am little aggressive with the accelerator.
Any help or input would be really appreciated. Thanks
For example....if I am cruising along at about 40 mph and need to speed up, I will "floor it" where I would anticipate the car to downshift to speed up. However when I do this, the rpm's go up but the car does not down shift, rather it jerks and gets "stuck" to the point it slows down to almost stalling. As I ease of the accelerator, the car finally downshifts but at this point its to pick up speed that I lost during transition phase. Any ideas? Nothing is coming up when the codes are pulled.
I have also noticed that when I drive the car from a cold start the samething happens from 1st to 2nd if I am little aggressive with the accelerator.
Any help or input would be really appreciated. Thanks
Super Member
Joined: Jan 2006
Posts: 584
Likes: 1
From: Atlanta, GA
C230K
How old is your MAF? Have you tried spraying it with the CRC MAF cleaner that you can buy at Pep Boys? Sometimes this will help for just a short time while other times it can last quite a while.
Thread Starter
Member
Joined: Dec 2002
Posts: 136
Likes: 0
From: Northern Virginia
2002 S-430
I did spray it with CRC but I am starting to lean towards the idea that it may need to be replaced. Any idea on the cost? Should I buy online or through the dealer?
Newbie
Joined: Jan 2008
Posts: 4
Likes: 0
From: UK
W202 C200
Try unplugging your MAF Sensor to see if this makes a difference, If there is an improvement then suspect the MAF. Also Try and get the ECU Codes read as this will point you in the right direction.
Hope this helps..........
Hope this helps..........
Thread Starter
Member
Joined: Dec 2002
Posts: 136
Likes: 0
From: Northern Virginia
2002 S-430
Can this be done or will the car throw a bunch of codes?
Newbie
Joined: Jan 2008
Posts: 4
Likes: 0
From: UK
W202 C200
If your MAF is not working properly then the Auto Box won't know what to do and when to do it, IE it won't know when to change up or down because there is no stable speed reference from the ECU.
Yes by disconnecting the MAF you are actually putting a fault on the car, but there will be a noticable difference in running if the MAF is faulty.
You can get the codes read before disconnecting it!
Yes by disconnecting the MAF you are actually putting a fault on the car, but there will be a noticable difference in running if the MAF is faulty.
You can get the codes read before disconnecting it!
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Thread Starter
Member
Joined: Dec 2002
Posts: 136
Likes: 0
From: Northern Virginia
2002 S-430
If your MAF is not working properly then the Auto Box won't know what to do and when to do it, IE it won't know when to change up or down because there is no stable speed reference from the ECU.
Yes by disconnecting the MAF you are actually putting a fault on the car, but there will be a noticable difference in running if the MAF is faulty.
You can get the codes read before disconnecting it!
Yes by disconnecting the MAF you are actually putting a fault on the car, but there will be a noticable difference in running if the MAF is faulty.
You can get the codes read before disconnecting it!
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Newbie
Joined: Jan 2008
Posts: 4
Likes: 0
From: UK
W202 C200
Here in the UK thats a Dealer or Independant Specialist Job who have the Code reading setup or Mercedes "Star" Computer System.
Someone on here must be able to advise you of a U.S. alternative!
Hope you get on OK.
Someone on here must be able to advise you of a U.S. alternative!
Hope you get on OK.
Thread Starter
Member
Joined: Dec 2002
Posts: 136
Likes: 0
From: Northern Virginia
2002 S-430
I was just at Autozone. We discovered that the port for the Code Reader is not under the driver side dash but in the engine compartment. Is this true?
Thread Starter
Member
Joined: Dec 2002
Posts: 136
Likes: 0
From: Northern Virginia
2002 S-430
So I pulled the codes again today and P0170 is the code that came up. I starting to think the following could be the problems in order:
1. Fuel Filter
2. Bad MAF
3. Intake Manifold leak
Any suggestions?
1. Fuel Filter
2. Bad MAF
3. Intake Manifold leak
Any suggestions?
Newbie
Joined: Oct 2007
Posts: 14
Likes: 0
1999 C230 Kompressor
on a cold start the car always whines and sounds/ feels jerky. thats normal. if i remember correctly its something with the engine but its normal. my dad works at mercedes and i had asked him, my car is jerky when i first start it. he asked if it was cold when i felt that and i asid yeah. he said no worries, its normal
Newbie
Joined: Jan 2008
Posts: 10
Likes: 0
1998 w202 C280
Could also be a coil pack going bad giving the Lean code.. Try cleaning the MAF first..
Thread Starter
Member
Joined: Dec 2002
Posts: 136
Likes: 0
From: Northern Virginia
2002 S-430
Changed the MAF and it was an instant difference in performance. Most of the symptoms are gone. I will drive it for a few more days before posting the final results. But so far so good! Thanks for the information/help guys.
Super Member
Joined: Jan 2006
Posts: 584
Likes: 1
From: Atlanta, GA
C230K
>>I will drive it for a few more days before posting the final results.<<
Good thought. The ECU probably needs some time to self adapt if you don't do a reset manually via the key sequence (search for it) or disconnect the battery (don't forget to resync the windows, sunroof and have your radio code).
Good thought. The ECU probably needs some time to self adapt if you don't do a reset manually via the key sequence (search for it) or disconnect the battery (don't forget to resync the windows, sunroof and have your radio code).
Thread Starter
Member
Joined: Dec 2002
Posts: 136
Likes: 0
From: Northern Virginia
2002 S-430
>>I will drive it for a few more days before posting the final results.<<
Good thought. The ECU probably needs some time to self adapt if you don't do a reset manually via the key sequence (search for it) or disconnect the battery (don't forget to resync the windows, sunroof and have your radio code).
Good thought. The ECU probably needs some time to self adapt if you don't do a reset manually via the key sequence (search for it) or disconnect the battery (don't forget to resync the windows, sunroof and have your radio code).
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