[SnapCoupe]

I purchased my car over a year ago with 70k miles and ever since it has always struggled with long cranks on cold starts. I had a feeling it was the HPFP, but I didn't want to blindly replace it without any specific codes. After flashing MHD onto the car a few months after buying it, the HPFP "shadow code" has been present ever since. Fast-forward through getting a new motor (with injectors, plugs, and coils), a new battery, and a laundry list of other items, my HPFP finally started throwing codes 2 weeks ago. After driving the car in limp mode while waiting for the new pump to arrive, I was finally able to replace it last night. Driving around afterwards, the car felt fantastic and the powerband felt much smoother than it was prior. After logging 50 miles or so, I checked the codes and everything was clear.

This morning I went to start the car and it took 4-5 seconds to finally crank over... Annoyingly enough, when I went to read the codes I saw that the HPFP "shadow code" had returned. The only thing I haven't replaced is my LPFP, which I know is perfectly healthy after running fuel pressure tests on it recently.

Does anyone have any ideas to what could be going on? I'm completely stumped at this point.

[Kev0]

Originally Posted by SnapCoupe

I purchased my car over a year ago with 70k miles and ever since it has always struggled with long cranks on cold starts. I had a feeling it was the HPFP, but I didn't want to blindly replace it without any specific codes. After flashing MHD onto the car a few months after buying it, the HPFP "shadow code" has been present ever since. Fast-forward through getting a new motor (with injectors, plugs, and coils), a new battery, and a laundry list of other items, my HPFP finally started throwing codes 2 weeks ago. After driving the car in limp mode while waiting for the new pump to arrive, I was finally able to replace it last night. Driving around afterwards, the car felt fantastic and the powerband felt much smoother than it was prior. After logging 50 miles or so, I checked the codes and everything was clear.

This morning I went to start the car and it took 4-5 seconds to finally crank over... Annoyingly enough, when I went to read the codes I saw that the HPFP "shadow code" had returned. The only thing I haven't replaced is my LPFP, which I know is perfectly healthy after running fuel pressure tests on it recently.

Does anyone have any ideas to what could be going on? I'm completely stumped at this point.

I just replied in the MHD thread about if any of the maps will have a long term effect on the HPFP since I just replaced my HPFP last week and my car only have 50k miles. I'm 91ACN stage 2+. Wonder if the aggressiveness of the maps shorten the life of the fuel pumps.

[SnapCoupe]

Originally Posted by Kev0

I just replied in the MHD thread about if any of the maps will have a long term effect on the HPFP since I just replaced my HPFP last week and my car only have 50k miles. I'm 91ACN stage 2+. Wonder if the aggressiveness of the maps shorten the life of the fuel pumps.

I can't imagine MHD having any significant impact on the HPFP. The rail pressure on the stock map is just about the same as the MHD maps at WOT. Also, the cold start issue has occurred on stock, COBB, and MHD maps for me.

I personally just think it's the design of the HPFP on these motors thats the issue. I find it kind of funny that BMW announced they upped the pressure on the new 3-series motors from 200 bar to 350 bar. I wonder how long the seals in those HPFPs will last.

[cahme]

What are the shadow codes?

[IllSic_Design]

Ever since I flashed MHD I have had a shadow code for HPFP(fuel pump plausibility is what I think it says). I have read/been told that it is semi-normal for some people to have this code. I have been tuned for 50k + miles now and now am FBO with stage 1 turbos and running E50 with upgraded lpfp and have no issues. As long as the car isn't hard to start, it runs fine, your rail pressure doesn't drop super low, or you don't have any actual active codes I wouldn't worry about it.

[lucasmiller2015]

Originally Posted by SnapCoupe

I purchased my car over a year ago with 70k miles and ever since it has always struggled with long cranks on cold starts. I had a feeling it was the HPFP, but I didn't want to blindly replace it without any specific codes. After flashing MHD onto the car a few months after buying it, the HPFP "shadow code" has been present ever since. Fast-forward through getting a new motor (with injectors, plugs, and coils), a new battery, and a laundry list of other items, my HPFP finally started throwing codes 2 weeks ago. After driving the car in limp mode while waiting for the new pump to arrive, I was finally able to replace it last night. Driving around afterwards, the car felt fantastic and the powerband felt much smoother than it was prior. After logging 50 miles or so, I checked the codes and everything was clear.

This morning I went to start the car and it took 4-5 seconds to finally crank over... Annoyingly enough, when I went to read the codes I saw that the HPFP "shadow code" had returned. The only thing I haven't replaced is my LPFP, which I know is perfectly healthy after running fuel pressure tests on it recently.

Does anyone have any ideas to what could be going on? I'm completely stumped at this point.

When I had my HPFP replaced under warranty (due to long cranks), the dealer also replaced the high pressure fuel sensor (P/N 13537620946 on my 03/11 N55). Did you replace that as well?

No codes or long cranks since then (on MHD Stage 1+).

[SnapCoupe]

Originally Posted by cahme

What are the shadow codes?

The shadow codes can only be seen by MHD and not BMW's ISTA diag software for some reason. I am not 100% sure what they are, but I have read on here that they were diag codes used during the engineering phase of the car/motor.

Originally Posted by IllSic_Design

Ever since I flashed MHD I have had a shadow code for HPFP(fuel pump plausibility is what I think it says). I have read/been told that it is semi-normal for some people to have this code. I have been tuned for 50k + miles now and now am FBO with stage 1 turbos and running E50 with upgraded lpfp and have no issues. As long as the car isn't hard to start, it runs fine, your rail pressure doesn't drop super low, or you don't have any actual active codes I wouldn't worry about it.

It seems like most people have the code, but I have been able to narrow down the exact point in which it comes back on after clearing it. If my car is warm, I can clear the code and it will not come back on unless the car has a long crank again. Typically it will only long crank when it sits over night. Every time that it takes 4+ seconds to turnover, the shadow code will show back up.

Originally Posted by lucasmiller2015

When I had my HPFP replaced under warranty (due to long cranks), the dealer also replaced the high pressure fuel sensor (P/N 13537620946 on my 03/11 N55). Did you replace that as well?

No codes or long cranks since then (on MHD Stage 1+).

I have no replaced the sensor. I was talking to a few techs and they said there are a couple codes specifically regarding the fuel rail sensor, and if I didn't have them it would be a waste to replace it.

[Pladi]

Originally Posted by SnapCoupe

I purchased my car over a year ago with 70k miles and ever since it has always struggled with long cranks on cold starts. I had a feeling it was the HPFP, but I didn't want to blindly replace it without any specific codes. After flashing MHD onto the car a few months after buying it, the HPFP "shadow code" has been present ever since. Fast-forward through getting a new motor (with injectors, plugs, and coils), a new battery, and a laundry list of other items, my HPFP finally started throwing codes 2 weeks ago. After driving the car in limp mode while waiting for the new pump to arrive, I was finally able to replace it last night. Driving around afterwards, the car felt fantastic and the powerband felt much smoother than it was prior. After logging 50 miles or so, I checked the codes and everything was clear.

This morning I went to start the car and it took 4-5 seconds to finally crank over... Annoyingly enough, when I went to read the codes I saw that the HPFP "shadow code" had returned. The only thing I haven't replaced is my LPFP, which I know is perfectly healthy after running fuel pressure tests on it recently.

Does anyone have any ideas to what could be going on? I'm completely stumped at this point.

My car has that code. Runs normal.. I dont think that code means anything to be honest. That code is a rabbit hole in my opinion. Now that doesnt mean you dont have fueling issues dont get me wrong. That we dont know. But what i do know is the code shows up on my MHD and my car runs great.

[Pladi]

Sorry but it should be " Sick and tired of having trouble with a modified car" lol

[redwildcat17]

Also have the shadow codes and recently been getting some longer cranks so I'll probably go ahead and replace mine, although I am under 70k so I was going to try to get it replaced under warranty but they said I needed codes in order to do so. How did you get yours to throw a code?

[lucasmiller2015]

Originally Posted by SnapCoupe

It seems like most people have the code, but I have been able to narrow down the exact point in which it comes back on after clearing it. If my car is warm, I can clear the code and it will not come back on unless the car has a long crank again. Typically it will only long crank when it sits over night. Every time that it takes 4+ seconds to turnover, the shadow code will show back up.

Originally Posted by Pladi

My car has that code. Runs normal.. I dont think that code means anything to be honest. That code is a rabbit hole in my opinion. Now that doesnt mean you dont have fueling issues dont get me wrong. That we dont know. But what i do know is the code shows up on my MHD and my car runs great.

Which specific codes are you guys getting?

[SnapCoupe]

Originally Posted by Pladi

My car has that code. Runs normal.. I dont think that code means anything to be honest. That code is a rabbit hole in my opinion. Now that doesnt mean you dont have fueling issues dont get me wrong. That we dont know. But what i do know is the code shows up on my MHD and my car runs great.

Originally Posted by Pladi

Sorry but it should be " Sick and tired of having trouble with a modified car" lol

Well, the car runs fine now except for the fact that the long cranks are still occurring. Considering the code pops up only after a long crank, is what is frustrating to me. Also, the long cranks were just as present when the car was bone stock as they are now, so I feel like this doesn't have anything to do with modifications.

Originally Posted by redwildcat17

Also have the shadow codes and recently been getting some longer cranks so I'll probably go ahead and replace mine, although I am under 70k so I was going to try to get it replaced under warranty but they said I needed codes in order to do so. How did you get yours to throw a code?

I was trying to get mine to throw a code for the longest time to get at least a decent % covered under warranty. Unfortunately it only threw a code once it finally went into limp mode, which was at 90k miles, so no warranty coverage.

[SnapCoupe]

Originally Posted by lucasmiller2015

Which specific codes are you guys getting?

2BDE and 2BF0 are the main two I consistently see.

[cahme]

Originally Posted by SnapCoupe

2BDE and 2BF0 are the main two I consistently see.

I initually had 2BF0 & 2BEF start showing up in December of last year, but didn't have any long cranks.
Then, in June, 2BDE showed up as did long cranks sometimes when car sat more than 10 hours.

I replaced my HPFP (Aug) and the codes & long cranks went away for a week, when I got one long crank and a new code along with the 2BF0 & 2BEF:
2BEC

No long cranks since, but I do still have the 2BEC occasionally by itself.

[lucasmiller2015]

Originally Posted by SnapCoupe

2BDE and 2BF0 are the main two I consistently see.

What's the part number of the replacement pump?

[Welcome to NBA Jam]

I've had 2bf0 and 2bef shadow codes since installing MHD. A lot of other users also report it without HPFP symptoms.

[SnapCoupe]

Originally Posted by lucasmiller2015

What's the part number of the replacement pump?

Part #: BMW-13517616446

I purchased a remanufactured HPFP from FCPEuro.

Originally Posted by Welcome to NBA Jam

I've had 2bf0 and 2bef shadow codes since installing MHD. A lot of other users also report it without HPFP symptoms.

It seems like a pretty common code. Though, I wouldn't have a problem with it if I wasn't still getting long cranks after everything I have replaced.

[Pladi]

Originally Posted by SnapCoupe

Part #: BMW-13517616446

I purchased a remanufactured HPFP from FCPEuro.



It seems like a pretty common code. Though, I wouldn't have a problem with it if I wasn't still getting long cranks after everything I have replaced.

When doing this type of troubleshooting you need to be very open minded to any possibilities. If your HPFP PSI readings are normal during drives and you are only getting long crank then it could be another issue. Try to log the crank period. And compare the pressure... Compare a normal crank to a long one. Be organized and save the logs and name them. Good crank/bad crank.. and so on.

If you see same pressures then its probably not ur pump. Forget the codes. They are not telling you much. You seem to be fixated to the codes but are not actually troubleshooting anything.

[lwgrenier]

Probably not much help but have you thought about your starter? I would have long/slow cranks before replacing mine.

[SnapCoupe]

Originally Posted by Pladi

When doing this type of troubleshooting you need to be very open minded to any possibilities. If your HPFP PSI readings are normal during drives and you are only getting long crank then it could be another issue. Try to log the crank period. And compare the pressure... Compare a normal crank to a long one. Be organized and save the logs and name them. Good crank/bad crank.. and so on.

If you see same pressures then its probably not ur pump. Forget the codes. They are not telling you much. You seem to be fixated to the codes but are not actually troubleshooting anything.

I'm not fixated on the codes, I just thought it was an odd coincidence that every time I clear them, they only come back after a long crank. I figured that fact might be helpful in getting to the bottom of this.

In regards to logging the cranks, I have tried this in the past and have struggled to get a proper log of the car starting up. When the car is cold after sitting over night, upon the first attempt of starting the car will continuously crank over until I go to press the start button again. Upon the second attempt of starting, the car will fire right up. Due to this, I haven't been able to log with MHD as it cancels the logging when I stop the first crank. Any ideas if there is a way around this?

I'm also contemplating taking my BMS intake off and throwing my OEM intake on to see if that could be messing with the MAF scaling on initial startup.

Originally Posted by lwgrenier

Probably not much help but have you thought about your starter? I would have long/slow cranks before replacing mine.

New starter and new battery as well. Starter sounds perfectly healthy too.

[Pladi]

Originally Posted by SnapCoupe

I'm not fixated on the codes, I just thought it was an odd coincidence that every time I clear them, they only come back after a long crank. I figured that fact might be helpful in getting to the bottom of this.

In regards to logging the cranks, I have tried this in the past and have struggled to get a proper log of the car starting up. When the car is cold after sitting over night, upon the first attempt of starting the car will continuously crank over until I go to press the start button again. Upon the second attempt of starting, the car will fire right up. Due to this, I haven't been able to log with MHD as it cancels the logging when I stop the first crank. Any ideas if there is a way around this?

I'm also contemplating taking my BMS intake off and throwing my OEM intake on to see if that could be messing with the MAF scaling on initial startup.



New starter and new battery as well. Starter sounds perfectly healthy too.

Thats interesting because i can start logging with the car OFF.. Try looging when the car is completely off you should be able to log that. I always have been able. Thats when your ACC mode. Start logging then start the car.

[SnapCoupe]

Originally Posted by Pladi

Thats interesting because i can start logging with the car OFF.. Try looging when the car is completely off you should be able to log that. I always have been able. Thats when your ACC mode. Start logging then start the car.

Okay, I'll try that and check back once I have a few logs to compare.