Problem with acceleration in a 2002 C240-Please Help
Super Moderator
Joined: Jun 2008
Posts: 19,942
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
I suggest you read this thread. Especially from post #40 onward. We battled, took a few wrong turns but we fixed it & Kris did not know cars well & made mistakes like not marking coil packs. This is the kind of methodical workthrough required if you don't want to pay the dealer a bucket full of money. These cars are complex.
https://mbworld.org/forums/c-class-w...light=KrisV420
https://mbworld.org/forums/c-class-w...light=KrisV420
Junior Member
Joined: Mar 2012
Posts: 45
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From: Beverly Hills ,California
C240 Mercedes Benz
NO not yet havent replaced wires yet.. im going to do that asap I dont have the tool to check the Feul Pressure.Ill follow your advice to the T... and post videos and pictures for those who need help also!
Junior Member
Joined: Mar 2012
Posts: 45
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From: Beverly Hills ,California
C240 Mercedes Benz
hey so i finally got the fuel pressure guage and hooked it up , i turned the key to acc and got a reading of 20psi and it sat there for a few. then i went ahead and cranked it and it shot up to like 45 or so and then after a few seconds it just dropped completely to like 10psi and lower then it just stayed at 10psi and the car was ideling irradiately. eventually the car just shut off.. whats your take on that ?
Junior Member
Joined: Mar 2012
Posts: 45
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From: Beverly Hills ,California
C240 Mercedes Benz
http://youtu.be/OQrCbVGEkcs here we go i just made this video of the car a few seconds ago i got a new fuel filter im going to replace that and see what happens.
Junior Member
Joined: Mar 2012
Posts: 45
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From: Beverly Hills ,California
C240 Mercedes Benz
ok so i just replaced the fuel filter started up the car the car started up and sputtered a bit at first then it ran like a champ sounded perfect i was like holly dookie stain then its like it lost pressure again and went to crap the car just started sputtering again and the car ended up shutting off. while it was running it sounded like it used to everything sounded perfect. what do you think its the feul pump? do fuel pumps pump fuel constantly? and im going to do a pressure test again. and what readings i get ill make a video and post it again! BRB!!!
Junior Member
Joined: Mar 2012
Posts: 45
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From: Beverly Hills ,California
C240 Mercedes Benz
here is a video of my car having its issue still after the fuel filter change.
http://youtu.be/nnh2j9Kz7RM
any advice would be greatly appreciated..
http://youtu.be/nnh2j9Kz7RM
any advice would be greatly appreciated..
Junior Member
Joined: Mar 2012
Posts: 45
Likes: 0
From: Beverly Hills ,California
C240 Mercedes Benz
i went ahead and pulled my codes and this is the code i got after doing the video above
P0123 Throttle/Petal Position Sensor/Switch A Circuit High Input what im going to do is im going to reset the TPS as shown in another thread I read and go from there i know that the TPS and the pedal assembly are all one unit.. but does the TPS explain the low fuel pressure reading that im getting? Would it be responsible for it? because the video evidently shows that the fuel pressure at the Fuel rail is not where its supposed to be ( Reading my mercedes handbook right now. It says that Fuel Pressure should be 54 to 59.5 PSI 3.7 to 4.1 bar
If the fuel pressure is not within specifications Check the following
A) If the pressure is lower than specified check for a restriction in the fuel system. One likely cause is a clogged fuel inlet strainer at the base of the fuel pump/fuel level sensor module in the right fuel tank chamber. Note The strainer cannot be replaced separately from the fuel pump. If you're unable to clean the strainer, Replace the fuel pump/fuel level sensor module (Section 5)
B) If the pressure is higher than specified, replace the fuel pressure regulator (Section 6) Which is an integral component of the fuel filter, chamber is located behind the left chamber of the fuel tank.)
P0123 Throttle/Petal Position Sensor/Switch A Circuit High Input what im going to do is im going to reset the TPS as shown in another thread I read and go from there i know that the TPS and the pedal assembly are all one unit.. but does the TPS explain the low fuel pressure reading that im getting? Would it be responsible for it? because the video evidently shows that the fuel pressure at the Fuel rail is not where its supposed to be ( Reading my mercedes handbook right now. It says that Fuel Pressure should be 54 to 59.5 PSI 3.7 to 4.1 bar
If the fuel pressure is not within specifications Check the following
A) If the pressure is lower than specified check for a restriction in the fuel system. One likely cause is a clogged fuel inlet strainer at the base of the fuel pump/fuel level sensor module in the right fuel tank chamber. Note The strainer cannot be replaced separately from the fuel pump. If you're unable to clean the strainer, Replace the fuel pump/fuel level sensor module (Section 5)
B) If the pressure is higher than specified, replace the fuel pressure regulator (Section 6) Which is an integral component of the fuel filter, chamber is located behind the left chamber of the fuel tank.)
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Junior Member
Joined: Mar 2012
Posts: 45
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From: Beverly Hills ,California
C240 Mercedes Benz
Electric Fuel Pump issues Close pictures
here are some pics i took i havent ordered anything yet because i posted a few videos and need some one to watch them and give me some insight can i get a explanation why the Feul pump would pump such a low fuel pressure? can someone explain what the 2 components are please.
Super Moderator
Joined: Jun 2008
Posts: 19,942
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
What is your fuel pressure. We have just been down this road on the W209 forum & it was the fuel pump. 35 psi instead of 55 psi.
It does sound as though you have a TPS problem as well but I would chase down the fuel pump.
It does sound as though you have a TPS problem as well but I would chase down the fuel pump.
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Junior Member
Joined: Mar 2012
Posts: 45
Likes: 0
From: Beverly Hills ,California
C240 Mercedes Benz
GOOD MORNING! Well the current reading when the vehicle is running is currently sitting at 20psi and drops to 11psi.. I included a few videos above running a fuel pressure compression test. please check them out ( unless you already did) My other question is why does it have what it seems like 2 fuel pumps on each side i know the one on passenger side is the actual Fuel Pump its self but what is the one on the driver side? and which one do you think is honestly responsible for the pressure being so low!!!!
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Junior Member
Joined: Mar 2012
Posts: 45
Likes: 0
From: Beverly Hills ,California
C240 Mercedes Benz
V6 - 2.6L 2597cc type 112.912 - MFI
im trying to order the fuel pump but need the chassis number. and where do you reccomend i order it from and what brand should I get?
Junior Member
Joined: Mar 2012
Posts: 45
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From: Beverly Hills ,California
C240 Mercedes Benz
i have a issue finding the chassis number i know you say its the VIN # but Oreillys seems to keep saying that the VIN # is not the chassis number my last numbers on my Vin are as follows 151019
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Maybe somebody else can chime in or you need to deal with some store more competent than Oreilly's. The whole Benz part ordering system globally runs on VIN. If you look under the carpets under the passenger front seat you will find a number stamped in the floor but it will line up with the VIN.
Junior Member
Joined: Mar 2012
Posts: 45
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From: Beverly Hills ,California
C240 Mercedes Benz
well im back took me long enough huh lol so yesterday after my busy schedule i actually made time to go pick up a new Fuel pump from the dealership. said F it... and the guy actually changed the price and said im not going to charge you 385.99 he said let me make it 330.00 and i even grabbed a new mercedes Benz Sweater lol the install was easy it took me about 45min to do longest part was making the 4 prong plug connections. i took plenty of pics and made a video. ill load them up and post them on here.. it willl def be helpfull for other DIY def very happy car runs amazing and total cost was 500.00 for everything brand new OEM fuel pump and new spark plugs also fuel filter!!! very happy guy right now!!!
Junior Member
Joined: Mar 2012
Posts: 45
Likes: 0
From: Beverly Hills ,California
C240 Mercedes Benz
Junior Member
Joined: Mar 2012
Posts: 45
Likes: 0
From: Beverly Hills ,California
C240 Mercedes Benz
more pic of electric pump
enjoy world ....... lol if anyone has a problem with the fuel pump check all your small stuff before you end up spending hundreds of dollars.
