c250 rough cold start - Page 2 - MBWorld.org Forums

Apr 18, 2023 | 03:19 AM

#26

calitintz

Newbie

Joined: Apr 2023

Posts: 6

Likes: 0

c250

Quote:

Originally Posted by chinatownabc

my car was there also for about 5 weks or so, did this also happen after the hpfp change? Is your car running lean as well?

Yes. Right after the hpfp replacement.

they replaced the plugs, coil, injectors, fuel pressure sensor in the tank and the fuel rail, another fuel pump and ecm to try and fix the misfire, but nothing changed. Still misfiring.

Apr 18, 2023 | 03:23 AM

#27

chinatownabc

Member

Joined: Aug 2014

Posts: 142

Likes: 0

2005 E55 AMG

Quote:

Originally Posted by calitintz

Did they charge you for all the replacement like the coils and injectors and etc. I assume its misfiring on all 4 cylinders.

Apr 18, 2023 | 03:37 AM

#28

calitintz

Newbie

Joined: Apr 2023

Posts: 6

Likes: 0

c250

Quote:

Originally Posted by chinatownabc

Did they charge you for all the replacement like the coils and injectors and etc. I assume imisfiring on all 4 cylinders.

Misfire on cyl 3. And sometimes random misfire. I asked them to replace all if they are replacing one thing. Just so all are new at the same time.

Apr 18, 2023 | 08:10 PM

#29

chinatownabc

Member

Joined: Aug 2014

Posts: 142

Likes: 0

2005 E55 AMG

Quote:

Originally Posted by calitintz

Misfire on cyl 3. And sometimes random misfire. I asked them to replace all if they are replacing one thing. Just so all are new at the same time.

So did you get your car back same thing?

Apr 18, 2023 | 09:12 PM

#30

calitintz

Newbie

Joined: Apr 2023

Posts: 6

Likes: 0

c250

Quote:

Originally Posted by chinatownabc

So did you get your car back same thing?

yeah nothing changed. Still misfiring.

Apr 19, 2023 | 12:16 AM

#31

calitintz

Newbie

Joined: Apr 2023

Posts: 6

Likes: 0

c250

Quote:

Originally Posted by chinatownabc

So did you get your car back same thing?

I might have some promising info for you.
today I got a call from a Indy shop that’s had my car. They said it hasn’t misfired in two days. They will let me know tomorrow what parts they replaced.

Apr 19, 2023 | 05:11 PM

#32

calitintz

Newbie

Joined: Apr 2023

Posts: 6

Likes: 0

c250

Quote:

Originally Posted by chinatownabc

So did you get your car back same thing?

fixed!

Low pressure fuel pump and fuel filter
running perfectly now.

Apr 28, 2023 | 04:08 PM

#33

chinatownabc

Member

Joined: Aug 2014

Posts: 142

Likes: 0

2005 E55 AMG

Quote:

Originally Posted by calitintz

fixed!

Low pressure fuel pump and fuel filter
running perfectly now.

Wow awesome ill give that a try thanks so much.

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Apr 28, 2023 | 04:14 PM

#34

chinatownabc

Member

Joined: Aug 2014

Posts: 142

Likes: 0

2005 E55 AMG

Quote:

Originally Posted by calitintz

fixed!

Low pressure fuel pump and fuel filter
running perfectly now.

do you know the exact part number they replaced? Might be on the invoice. im looking online and it seems that it might be the following, be great if you can confirm if they replaced both.
2124701394 (left pump)
2044700294 (right pump)

Dec 16, 2024 | 10:27 PM

#35

Yrv622

Newbie

Joined: Dec 2024

Posts: 1

Likes: 0

Solucion de arranque en frío

Quote:

Originally Posted by calitintz

If you figure out a solution please post.
my car has been at Mercedes for 7 weeks. Master tech and shop foreman has been on it. And they couldn’t figure it out, just got a call today for me to pick up my car, still cold start misfiring

The thing is very simple, under the air filter on the spider or manifold there is a TAF sensor, it is the first one, it has two tabs on the sides, well when the engine is cold, that is, disconnect it... and you will see that the fault disappears...

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