too much

I got my C43 coupe 2 months ago, switching from a BMW 435. While there are many differences between the two cars, as I was getting used with the C43, it seemed to lack some "oomph", compared with the 435. At some point I realized that when I was going WOT on the hwy entry lane, while the car was accelerating nicely up to 90-100 kph, it just staying in the 4th or 5th, 5-6K rpm, and not much happened. Where on the beemer I would have had to release the throttle to stay safe from the law, the C43 had no drama, it was slowly accelerating towards 140-150 in he same gear, at 5K . Basically the car moves spirited at low speed in sport+, but nothing much happens in the mid or higher range. As I was getting less and less happy with the car, I noticed that on the AMG engine status gauge, I wasn't getting beyond 200HP whatever I tried. Later I noticed that the AMG digital boost gauge doesn't move , it's "stuck" to the left, should it show anything ? I think it should indicate some boost once I'm past 3K rpm for example, shouldn't it ?

I contacted MB dealership to schedule an appointment, but it seems that it will take some time before I can get an appointment, and on the preliminary phone discussions, their opinion is that if there is any power loss , I should have some engine light come on (the beemer did that nicely )

Has anyone experienced anything similar, should the boost gauge indicate anything, do you see anything beyond 200HP on the AMG engine stats gauge, and if you do, what RPM ?

Thanks !

C43Ayemgee

Several people experienced this, Could be a boost leak, or in a soft limp mode. But not a big issue. C43 is superior to that 435i, when that problem gets fixed you will see.

too much

I cant wait, I want to at least like the car, as at this point , I'm willing to ignore the sub average sound system, and other small things, but wanted to love to drive this car...

AMG C43 3LV6

Did you buy it brand new?

There is a break in period of 1500kms?

I have only driven my car in COMFORT. To be honest, I havent experienced how powerful this car is, as i intend to keep this car for a while and properly breaking it in is important for the life of the car.

5ilver-5urfer

200 hp max on your HP gauge is not normal. Tell your dealer to look at it ASAP, and if they give you a much later service date then escalate as much as you need.

Spaggettio

sounds like soft limp mode

Dieseldan9

iTrader: (1)

agreed they should make exception to look at the car asap

call another dealer to find one who will work with you.

Cosworth2000

You should have a check engine. I'm surprised that you don't.

HTXgearhead

Steelguin

What menu on the car do you see the HP? Is that menu available on a 2018? I have looked and don't see it

munis

Two possiblities. Either you have a boost leak, which can be confirmed by looking at the boost bar in the odometer panel. Or you have busted exhaust valves causing the car to lock itself in a solf limp mode. Both easily remedied by dealership. Neither problems gives any CEL. It throws a soft code which only XENTRY can scan at the dealership.

Once fixed, you should get a full 362hp readout in the AMG drivers info.

Have fun!

RichardCranium3

Press the vehicle icon button on your central console > Dynamic Select > Engine Data

Steelguin

Mine doesn't have Engine data as an option there. Weird

C43Ayemgee

I don't either, I believe its only on the bigger screens with Nav option.

Steelguin

Ok thanks.

Bueller178

I seem to be having a similar problem although not as acute as yours.

I only get about 275 hp and 330 ft/lbs at best. My boost gauge does goto full but near 5800 rpm it drops to zero.

Initial quick test by the dealer they said they don't thing the gauges are accurate but I have the car going in about a month from now and will press them to dig futher.

Good luck, and keep us posted.

miztahsparklez

apparently this is an issue on the 2019 as well...

mine just did it and it's only at 3000 miles...

for those who have fixed the tube blowing off, did you figure out what causes it? also, did it happen again after you tightened it?

mine was fixed earlier today but blew off again... going to try it one more time before bringing it to the dealer.

jim04clk

I’ve never heard of this. Where is this tube that is getting loose or coming off ? Is it something we can reach and tighten in our driveway?

miztahsparklez

If you take off the engine cover it is the throttle body right under the middle duct that cools the ECU. You can easily see if it's disconnected. The very first time I lost ALL boost.

This time it's holding some boost, but I hear a whistling noise. But I see it's disconnected again.

jim04clk

Should maybe remove it and measure it. Have Samco or another tuner make a replacement silicone hose. And maybe upgraded clamps. Would be an easy inexpensive DIY upgrade.

Sunny9

Seems like I am having the same issue with my 2019 C43, I haven't seen HP gauge exceed low 200 range. I have 2400 miles so far. Dealers says car is still adjusting to my driving style. Is there a period/mileage after which car will start to get to "full power"? I had a loaner C300 and that had more power acceleration than my C43. What is Soft limp mode?
Also, my car has rhythmic mild vibration in the steering at highway speeds, dealer said its a C43 characteristic, not something that they can fix! Not sure if all this is related.

Malar

Don't work on a 2019 Car. Just put it on the Dealerships yard and enjoy another AMG for a Week.

Jujigatame

I have a 2017, and even when my tires were worn down almost to the belts there was no vibration through the steering at all.

NO WAY that's a C43 characteristic!

Josephph

Switch off the lane assist and try.

Dalle1985

Put the car in sport+ mode and floor it, if it doesn’t hit full power, something is wrong... the power is a calculated number, so if it doesn’t show full power, it means something is not allowing the engine to produce full power.

Mine had a similar issue. If I was driving the car normally for a while and then floored it, it would go to 270 kW (362 hp) for the first two gears, but after that, it would only go to around 200 kW (270 hp). This went on for a while until I decided something must be wrong. Took it to the dealer and it turned out the intercooler had developed an internal leak and drained off all the coolant in the LT circuit, which meant that the intercooler was doing nothing causing the engine to reduce boost to avoid the charge air becoming too hot. Intercooler replaced and the power is 270 kW no matter how much I floor it.
So if you have similar symptoms, pull off the engine cover and check the coolant level of the reservoir just left of the middle of the engine - if empty, chances are you need a new intercooler.