Advice Needed
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Joined: Feb 2010
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From: Bolingbrook Illinois
1999 C43 Amg
Advice Needed
Here's what's happening.
Turn car on it idles great.
Give it gas soft or hard it revs great, no hesitation.
I go for a ride, I step on the gas pedal half or full throttle and engine revs some but than chokes and the car goes nowhere. As the engine is choking or stalling the trans kicks in hard but car goes nowhere because engine is stalling.
I have no current or stored codes at all. I have installed a 100 percent functioning accelerator pedal sensor and maf.
Car only chokes or hasitates hard when car is in the road and I step hard on the gas. If I drive normal the engine does not hesitate or choke at all. And the trans shifts perfectly.
Could this be a fuel pump issue? I will change the pump and fuel filter if that's the problem.
Btw, I have installed/replaced within a year. Plugs, plug wires, O2 sensors, cam and crank sensors and air filters, aFe which uses no oil.
Any thoughts?
Turn car on it idles great.
Give it gas soft or hard it revs great, no hesitation.
I go for a ride, I step on the gas pedal half or full throttle and engine revs some but than chokes and the car goes nowhere. As the engine is choking or stalling the trans kicks in hard but car goes nowhere because engine is stalling.
I have no current or stored codes at all. I have installed a 100 percent functioning accelerator pedal sensor and maf.
Car only chokes or hasitates hard when car is in the road and I step hard on the gas. If I drive normal the engine does not hesitate or choke at all. And the trans shifts perfectly.
Could this be a fuel pump issue? I will change the pump and fuel filter if that's the problem.
Btw, I have installed/replaced within a year. Plugs, plug wires, O2 sensors, cam and crank sensors and air filters, aFe which uses no oil.
Any thoughts?
Last edited by speed43; Mar 31, 2020 at 08:40 AM.
Thread Starter
MBWorld Fanatic!
Joined: Feb 2010
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From: Bolingbrook Illinois
1999 C43 Amg
Junior Member
Joined: Dec 2019
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Red 1995 C36
This sounds a lot like a bad throttle body. This is pseudo common on these cars and can be taken care of.
Hers an old thread I found with 1 minute of googling.
Old throttle body thread
Hers an old thread I found with 1 minute of googling.
Old throttle body thread
Thread Starter
MBWorld Fanatic!
Joined: Feb 2010
Posts: 1,506
Likes: 130
From: Bolingbrook Illinois
1999 C43 Amg
This sounds a lot like a bad throttle body. This is pseudo common on these cars and can be taken care of.
Hers an old thread I found with 1 minute of googling.
Old throttle body thread
Hers an old thread I found with 1 minute of googling.
Old throttle body thread
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From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
Just wondering if the MAF is not playing up. Surprised there are no codes 
Thread Starter
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From: Bolingbrook Illinois
1999 C43 Amg
I ordered a new fuel pump and filter as both have not been replaced from what I found out from x owner. If it fixes the issue great, if not no harm...
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05 c55 silver, 98 Imperial Red C43
Seems a little extreme for a fuel pump issue.
I dont think the car would start at all if the fuel pump was faulty.
The fact that the car starts and idles means its getting fuel. Does the car ever not start or have a hard time starting?
GIve the car a good reset.
Disconnect the battery for at least 15 minutes and go from there. Also make sure your sparkplug wires have proper connections. Were these done recently?
I dont think the car would start at all if the fuel pump was faulty.
The fact that the car starts and idles means its getting fuel. Does the car ever not start or have a hard time starting?
GIve the car a good reset.
Disconnect the battery for at least 15 minutes and go from there. Also make sure your sparkplug wires have proper connections. Were these done recently?
Last edited by PJmak; Apr 1, 2020 at 01:25 PM.
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98 C43, 15 Alfa 4C LE, 18 Tesla Model 3 DM Perf, 08 Duc S1000, 02 Duc 998, 98 Duc 748, 01 Miata
Sounds a lot like when my MAF went bad. I also was not getting a code for the longest time and then I got P0172 I believe. But it basically felt like the car was a bit sluggish and wasn't making anywhere near 300 hp at WOT, especially once I got above 2.5k to 3k RPMs.
Thread Starter
MBWorld Fanatic!
Joined: Feb 2010
Posts: 1,506
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From: Bolingbrook Illinois
1999 C43 Amg
Seems a little extreme for a fuel pump issue.
I dont think the car would start at all if the fuel pump was faulty.
The fact that the car starts and idles means its getting fuel. Does the car ever not start or have a hard time starting?
GIve the car a good reset.
Disconnect the battery for at least 15 minutes and go from there. Also make sure your sparkplug wires have proper connections. Were these done recently?
I dont think the car would start at all if the fuel pump was faulty.
The fact that the car starts and idles means its getting fuel. Does the car ever not start or have a hard time starting?
GIve the car a good reset.
Disconnect the battery for at least 15 minutes and go from there. Also make sure your sparkplug wires have proper connections. Were these done recently?
Thread Starter
MBWorld Fanatic!
Joined: Feb 2010
Posts: 1,506
Likes: 130
From: Bolingbrook Illinois
1999 C43 Amg
Sounds a lot like when my MAF went bad. I also was not getting a code for the longest time and then I got P0172 I believe. But it basically felt like the car was a bit sluggish and wasn't making anywhere near 300 hp at WOT, especially once I got above 2.5k to 3k RPMs.
MBWorld Fanatic!
Joined: Mar 2010
Posts: 5,889
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From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
Thread Starter
MBWorld Fanatic!
Joined: Feb 2010
Posts: 1,506
Likes: 130
From: Bolingbrook Illinois
1999 C43 Amg
MBWorld Fanatic!
Joined: Mar 2010
Posts: 5,889
Likes: 323
From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
I believe you need to put some fuel in the new filter before connecting the lines and assembling onto the vehicle
Thread Starter
MBWorld Fanatic!
Joined: Feb 2010
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From: Bolingbrook Illinois
1999 C43 Amg
Really? I've done the pump and filter on 3 w202s and never did this. Just finished the job last night and car turned on with no problems. Today im going to test drive see if it still chokes when I give it gas hard.
Thread Starter
MBWorld Fanatic!
Joined: Feb 2010
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From: Bolingbrook Illinois
1999 C43 Amg
Yesterday I took the car for a drive. Problem completely solved. Running so much better even when driving normal. And now when I floor it the car goes and does not choke anymore. I changed the fuel filter which looked good. And fuel pump which looked very old.
Thanks to those that posted, really appreciate it.
Thanks to those that posted, really appreciate it.
