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c250 rough cold start

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Old 04-18-2023, 03:19 AM
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c250
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.
Old 04-18-2023, 03:23 AM
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2005 E55 AMG
Originally Posted by calitintz
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.
Did they charge you for all the replacement like the coils and injectors and etc. I assume its misfiring on all 4 cylinders.
Old 04-18-2023, 03:37 AM
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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.
Old 04-18-2023, 08:10 PM
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2005 E55 AMG
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?
Old 04-18-2023, 09:12 PM
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Originally Posted by chinatownabc
So did you get your car back same thing?

yeah nothing changed. Still misfiring.
Old 04-19-2023, 12:16 AM
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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.
Old 04-19-2023, 05:11 PM
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Originally Posted by chinatownabc
So did you get your car back same thing?
fixed!

Low pressure fuel pump and fuel filter
running perfectly now.
Old 04-28-2023, 04:08 PM
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2005 E55 AMG
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.
Old 04-28-2023, 04:14 PM
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2005 E55 AMG
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)


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