at1023

I have a question for the members here. I have a 14 E63 and have been having a weird situation and was hoping for some answers. The car is stock other than a stage one tune. (I won't say the name of the tune publicly cause I'm waiting to here from them) that I have put about 10K miles on since FEB of this year. On Saturday I was traveling from the Bay Area down to Los Angels and back and had a situation pop up. After doing one hard pull against an STI I had the check engine light come on. Did not have my scanner at the time. Car still drove fine and was not misfiring and confinued to drive fine. However after that I every time I tried accelerate beyond 3K rpm the car cut rpms and slowed up. No misfires. But I could gently reapply the throttle and hold at around 2500rpm and cruise fine. After spending a few hours at Universal Studios we got back in to drive back to Bay Area and the CEL went away on its own. However the first time I tried to open it up again the same thing happened. After getting up today I pulled the codes at got P0087 and cleared the does. Later on today I also I tried a hard pull from a dig and first two gears were find but 3rd gear at around 4k it cut again. Pulled the code and same P0087. I decided to flash the car back to stock with the MyGenius scanner and took it back out and beat on it hard and the car pulled strong, no CEL, no rpm cuts or Anything. My question does this sound like a problem with the tune, because I have had almost a year of good usage before this happened or is something degrading and the increased demands of the tuning are causing issues. (Also the Plugs were changed in Feb with the flashing of the tune with MB OEM plugs while having a major service at a MB dealer)

Also towards the end of the trip getting back to Bay Area last night I kept getting an alert on the dash saying to consider taking a brake. I was not weaving and was maintaining good lane discipline. How can I turn that off or do I have to program it out. (Was driving for about 11hrs yesterday).

PeterUbers

Were you running low on gas at the time of these hard runs? Like less than 1/4 tank?


second item - in settings on the dash you can adjust the Nannie's monitoring your wheel control etc, lane change alerts, distronic etc

CaliBenzDriver

With this extended test drive... now you have a few trails to explore:
LOW FUEL PRESSURE is center stage.

Obviously if the ECU firmware highjack is bugging your engine, you can figure that one yourself.
Some love tuning... some regret it

Now you can chart your fuel pressure vs. RPM.

Low pressure module may be starving HPFP.

Low voltage on extended cruise is a reality - Keep an eye on battery display or let your trusted indy do all the fun work.

It's not just tune gone bad: you have to dig in the data to understand why your lost power is starved from gas.

at1023

this hapenned at all stages of fullness in the tank, from almost full, to about a quarter of a tank

WANTED!!

For your first question, I doubt your tune is causing the issue. You probably have something failing intermittently associated with your fuel system. Given time it'll most likely occur even on stock calibration.

kevm14

Tasos has a video on how to check fuel pump duty cycle (not sure which one) and what normal values are at stock power levels. Don't play games with fuel supply issues on a tuned M157. Find the problem and fix it ASAP.

cotmfk

I agree with both of these. Best of luck.

Sparks have 10k on them - are they stock?
There have been instances in my area of a specific gas station "faking" the grade of gas - aka - putting water in with the gas or selling 87 in the 93 pump. Obviously caused issues for those people that bought that fuel - I will never fill up there.
Fuel pumps - already mentioned by others.

Logging, if you are able, could help provide some answers. People here are usually helpful in analyzing others' logs to diagnose issues. That or a good indy would be helpful. Again, best of luck.

Siegmann

Sounds like a fuel delivery issue, not a tune problem. The problem likely goes away with the stock tune because boost is lower and there's less fuel demand. If the stage 1 tune is on the rich side, it will make the problem even more obvious. How many total miles on the car?

at1023

The car has about 71000 on it right now and plugs were OEM from the MB dealer. Can anyone here recomend a good data logger to get some more info from running the car and provide a link to Tasos material. (I don't know who that is) Finally does this situation sound more like the in tank pump is going or is it the high pressure pump on the engine? And is their an effective way to diagnoise the problem as DIYer. Thanks for all the great responses to the post.

kevm14

Unfortunately I don't think these are the ones I was looking for (duty cycle commentary).


Still not the one I was looking for but shows a diagnosis of the low pressure pump. The video I am looking for explains what duty cycle is normal and what shows a potential fuel starvation issue.

Siegmann

AMGfifty5

what part of the Bay Area are you in? I know a Benz performance shop in Hayward that does data logging.

at1023

Located in Fairfield, so Hayward isn't that far away.

UPDATE:
Same code is coming up now that the car is Detuned. I used my portable scan tool onboard monitoring function and got the problem to happen again while viewing the fuel pressure. Fuel pressure went from 3000ish psi down to about 700 psi when the pressure cut. Is this indicative of the low pressure pump failing?

kevm14

Probably

Siegmann

More likely the high pressure pumps in my opinion. Otherwise the code would be for low pressure upstream of the HPFPs.

I.T. Guy

I'll upvote fuel pumps read here:

https://mbworld.org/forums/w212-amg/...ce-e-tune.html

AMGfifty5

here is the ig for his shop.

https://www.instagram.com/benzonlygarage/

at1023

Can I get away with changing just the right side pump or do both need to be changed?

Faast

Don't try to cut corners and try to diagnose/fix it yourself
Just remember, one over sight and you are looking at $35,000+ (motor rebuild)
Have the car properly looked at, data logged and fix what ever needs fixing
Just remember------------You gotta pay to play or drive stock-------------