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Hey, I have a 2009 c300 4matic sport the car has 202,000 miles! At low RPMs (1500 - 3000) the car seems to flutter sound wise and feel wise. The rpm needle doesn’t flutter but the engine does? I changed plugs last year that didn’t help. The secondary air pump thing failed a few days ago but the car has had this feeling for years before the check engine light came on for that. Any ideas what could be going on?
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Scan with a Mercedes-specific scanner for any codes. Do NOT use a generic OBD scanner. iCarsoft MB V3.0, Launch Creader Elite MB, Foxwell NTS510, BlueDriver are all good and available on Amazon. Some are multi vehicle, but all will scan specifically Mercedes.
Scan with a Mercedes-specific scanner for any codes. Do NOT use a generic OBD scanner. iCarsoft MB V3.0, Launch Creader Elite MB, Foxwell NTS510, BlueDriver are all good and available on Amazon. Some are multi vehicle, but all will scan specifically Mercedes.
i was hoping for a little more then get it scanned.
I mean do I have to lay it out? I mean no **** I can probably tell from getting it scanned. I was hoping that someone would come across this thread and be like hey man I had the same exact issue and it was blah blah blah, isn’t that what forums are for? You may have just responded and said take it to the dealer.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
OK. Take it to the dealer.
With your attitude, I'll be surprised you get any more help. You don't (or can't) even tell us what the CEL is for and somehow we're supposed to know what's wrong. You've been a member since 2011 and on your 4th or 5th post, you want someone to solve your problems for you? You want a solution? Replace everything until it works.
With your attitude, I'll be surprised you get any more help. You don't (or can't) even tell us what the CEL is for and somehow we're supposed to know what's wrong. You've been a member since 2011 and on your 4th or 5th post, you want someone to solve your problems for you? You want a solution? Replace everything until it works.
Good luck!
so you post a lot that makes you better then me lol you post in a forum “get it scanned” that’s really helpful. And if you properly read my original post I said my check engine light is on because the secondary air pump has failed.
Thanks Tim for responding. I at one point was thinking it has to do with the fuel pump or filter or something. If the high pressure fuel pump was failing would that cause that feeling at low RPMs?
Thanks Tim for responding. I at one point was thinking it has to do with the fuel pump or filter or something. If the high pressure fuel pump was failing would that cause that feeling at low RPMs?
Thanks Tim! I looked it up those are the same exact symptoms that I am having. I appreciate you taking the time and helping me out with this. Thanks for utilizing the forum on how it should be utilized even though I only have 2 posts. God Bless You
I looked up your symptoms and a few people ended up replacing there high pressure fuel pump and it seemed to fix the issue. But i looked and think you have the M272 engine, which does not have that. The fuel pump is under the back seat.
What do you mean flutter? Im trying to picture what it is doing.
I looked up your symptoms and a few people ended up replacing there high pressure fuel pump and it seemed to fix the issue. But i looked and think you have the M272 engine, which does not have that. The fuel pump is under the back seat.
What do you mean flutter? Im trying to picture what it is doing.
I looked it up as well I am fairly certain the w204 motor has it.
Im not sure if I can paste links here but I will try anyway.
The W204 comes in a few different engines, what engine do you have? The listing you linked to is for the 3.5 which I believe is the M276 direct injection and were available 2012-2014 in the C300. I have the M272 3.0 which is port injection and dont see a high pressure pump anywhere, I was under the hood earlier and it seems the fuel line coming from the back goes directly to the fuel rail which feeds the injectors. I could be totally wrong, but im not seeing it on mine at least.
The W204 comes in a few different engines, what engine do you have? The listing you linked to is for the 3.5 which I believe is the M276 direct injection and were available 2012-2014 in the C300. I have the M272 3.0 which is port injection and dont see a high pressure pump anywhere, I was under the hood earlier and it seems the fuel line coming from the back goes directly to the fuel rail which feeds the injectors. I could be totally wrong, but im not seeing it on mine at least.
heres what the fuel line looks like, comes from the rear then directly to the fuel rail.
Fuel line in yellow. Pay no attention to the red arrows.
Thanks for the follow up, so what you are saying (and I can confirm tomorrow) that my car/engine doesn’t even have the HPFP. If that’s the case would you think the fuel pump under the seat might be going bad? Only way to test that is to have a pressure test on it?
I think if there was an issue with the fuel pump you would be getting some check engine codes. But fuel pressure is pretty simple to check. Higher end scanners will show the fuel pressure, or you can easily hook up a pressure gauge to the port on the fuel rail. I circled it in yellow.
Just unscrew the cap and hook up pressure gauge.
If you have a scanner it may show fuel pressure.
Heres the fuel pump diagram if there is something wrong.
I think if there was an issue with the fuel pump you would be getting some check engine codes. But fuel pressure is pretty simple to check. Higher end scanners will show the fuel pressure, or you can easily hook up a pressure gauge to the port on the fuel rail. I circled it in yellow.
Just unscrew the cap and hook up pressure gauge.
If you have a scanner it may show fuel pressure.
Heres the fuel pump diagram if there is something wrong.
Awesome, thanks for the info. I just ordered a pressure tester, I should have it tomorrow. Thanks again.
I think if there was an issue with the fuel pump you would be getting some check engine codes. But fuel pressure is pretty simple to check. Higher end scanners will show the fuel pressure, or you can easily hook up a pressure gauge to the port on the fuel rail. I circled it in yellow.
Just unscrew the cap and hook up pressure gauge.
If you have a scanner it may show fuel pressure.
Heres the fuel pump diagram if there is something wrong.
I hooked up the pressure tester, I think the fuel pump is fine? I just started the car and let idle.
Can you describe it a little more in detail what its doing. I dont have an idea in my head what its doing/sounds like.
The car seems to hesitate when accelerating and feels like it has low power. When this is happening you can hear/feel it sputtering/vibrating almost like its not getting enough fuel. This feeling is now worse then lets say a few weeks ago.
The secondary air pumped recently just threw a check engine light but this sputtering has been happening well before the CEL. I was reading up on the Secondary air pump and saw something that the pump could control/mess up the air to fuel ratio, I wonder if that is what's happening? Also I noticed that both my intake vents/tubs that connect to the air box are broken so maybe the engine is pulling in hot air also causing this?
09-27-2023, 10:15 PM
