CP3 mod with P0088

[catdaddyrachel]

Good evening everyone,

I spent the last few weeks lurking through the forums for a solution but to no avail.

I have a 2012 A3 TDI and within the last year, it has gone through TWO HPFP failures. Both times the mechanic attributed it to fuel contamination. Both times the pump went without warning.

A friend who has a JSW TDI recommended I do the CP3 mod so while I was away in a business trip, I dropped the car off at a shop and they did the mod for me.

I bought the retrofit kit from cascade german which included new injectors, CP3 R70 pump, intermediate pump, filter and new fuel lines. The kit is supposed to be plug

we managed to get the car running but now it has a permanent P0087 and P0088 code. It also keeps flagging a pending P0088.

the car will intermittently start but after some driving, I get the coil indication and the P0088 fail and the car will go into limp mode.

At this point, I’m not sure what to do, maybe it’s the metering valve on the pump?

does anyone have any suggestions?

 

[borninabus]

my suggestion would be to code wrap a VCDS scan and post it

 

[P2B]

16471/P0087/000135 - Ross-Tech Wiki

P0088 - Ross-Tech Wiki

Suggests checking the Advanced Measuring Values for Rail pressures to start with.

 

[catdaddyrachel]

21:31:59
328.0 bar High Fuel Pressure (specified)
328.0 bar High Fuel Pressure (actual)
37.1 % Quantity Measuring Control Valve


this is what i got from the advanced measuring value. Does this appear to be off?

 

[catdaddyrachel]

I replaced the G247-Rail Fuel Pressure Sensor, still the same. I'll replace the N276-Fuel Pressure Regulator Valve tonight.

As far as characterizing the problem more;
I go for a short drive and everything is fine. I let the car sit for maybe a few minutes, then go for another drive. During this drive, within about 5-10 min, the car will then eventually throw the fault. I can feel the power start to decline right before the glow plug light starts flashing. If i cycle the ignition, the fault will go away.

It almost seems like pressure is building up in the rail over time but it cannot bleed off? Any thoughts.

 

[McGuirk]

So on mine after my cp3 install I had the p0087 when I would launch the car. My fix was to upgrade the rail sensor to a 2200 bar sensor and then had the tuner re code my tune for the increased range of the new sensor. I never had a hpfp failure though. It's possible if you didn't replace the regulator valve on the driver side of the rail that it still has some metal debris in it. If you pull it out you can notice it has a very fine metal screen. If it's clogged or partially blocked it could easily cause your issues.

 

[catdaddyrachel]

I fixed the problem and I have some important notes for anyone running into the same issue.

I replaced both the sensor and the solenoid on the fuel rail, both did not fix the problem. I was able to source 928 400 643 FMV from Lithuania and replaced the part and now everything works as advertised. 50 miles today and still no issues. If you happen to run into this problem, here is a sure fire way to isolate a incorrect FMV. If the FMV is wrong, the fuel lines will become boiling hot after just a few minutes of the car being on. Within maybe 5 minutes, the entire fuel system will be too hot to touch. With the correct FMV, you should be able to comfortable touch the fuel lines and they will just be warm. Of course, verify with VCDS but this was the biggest difference i noticed after the fix.

Also, If anyone buys their kits from Cascade German, buy with caution. Apparently they are 3rd party sourcing their pumps and not confirming if the pumps are BMW R70 pumps. I was speaking w/ fisher and he told me that the pump that Cascade sold me came off a Puegot, not a BMW. if you get one without 928 400 643 FMV , it;s not a BMW pump and the FMV will have to be replaced.

Lastly, I'm not sure if Cascades customer service has been hit or miss recently but after I told him there was a problem with the kit, he stopped responding to emails all together. Perhaps this is a one-off or maybe something is going on over there but just keep in mind that this could happen to you.

 

[calimustang]

Wow, it was extremely hot to touch? Sounds like the fuel flow was too low and starving your engine. I never checked on that part when that happened to me.

I actually experienced the very same thing with the incorrect FMV (pisspoor performance, fuel economy was awful)

Yep! I warned those vendors several times and it fell through the “deaf” ears/eyes. I am very disappointed about that.

so then, 2micron/Andrew helped me with the FMV issue back then

o, I saved it in the notes just in case of future customers’ needing help.

I am truly happy to hear your issues has been solved.

 

[McGuirk]

I fixed the problem and I have some important notes for anyone running into the same issue.

I replaced both the sensor and the solenoid on the fuel rail, both did not fix the problem. I was able to source 928 400 643 FMV from Lithuania and replaced the part and now everything works as advertised. 50 miles today and still no issues. If you happen to run into this problem, here is a sure fire way to isolate a incorrect FMV. If the FMV is wrong, the fuel lines will become boiling hot after just a few minutes of the car being on. Within maybe 5 minutes, the entire fuel system will be too hot to touch. With the correct FMV, you should be able to comfortable touch the fuel lines and they will just be warm. Of course, verify with VCDS but this was the biggest difference i noticed after the fix.

Also, If anyone buys their kits from Cascade German, buy with caution. Apparently they are 3rd party sourcing their pumps and not confirming if the pumps are BMW R70 pumps. I was speaking w/ fisher and he told me that the pump that Cascade sold me came off a Puegot, not a BMW. if you get one without 928 400 643 FMV , it;s not a BMW pump and the FMV will have to be replaced.

Lastly, I'm not sure if Cascades customer service has been hit or miss recently but after I told him there was a problem with the kit, he stopped responding to emails all together. Perhaps this is a one-off or maybe something is going on over there but just keep in mind that this could happen to you.

Fisher is an awesome guy. Very helpful and great customer service. Just put a cp3 kit with pump and a hybrid turbo on a friend's A3. He did the tune on the ECU as well. By the way what was the P/N of the FMV that the original pump came with? I know Malone can tune for specific valves if you have the part number.

 

[wondermutt]

I replaced both the sensor and the solenoid on the fuel rail, both did not fix the problem. I was able to source 928 400 643 FMV from Lithuania and replaced the part and now everything works as advertised. 50 miles today and still no issues. If you happen to run into this problem, here is a sure fire way to isolate a incorrect FMV. If the FMV is wrong, the fuel lines will become boiling hot after just a few minutes of the car being on. Within maybe 5 minutes, the entire fuel system will be too hot to touch. With the correct FMV, you should be able to comfortable touch the fuel lines and they will just be warm. Of course, verify with VCDS but this was the biggest difference i noticed after the fix.

Also, If anyone buys their kits from Cascade German, buy with caution. Apparently they are 3rd party sourcing their pumps and not confirming if the pumps are BMW R70 pumps. I was speaking w/ fisher and he told me that the pump that Cascade sold me came off a Puegot, not a BMW. if you get one without 928 400 643 FMV , it;s not a BMW pump and the FMV will have to be replaced.

Not going to lie but I'm happy that I've come across your post. Everything that you posted is comparable to what I'm experiencing with my 2011 Jetta and I purchased the kit through Cascade. Not sure if this adds to your view of the wrong FMV but one of the things that I'm noticing is the hose that connects to the cp3 from the aux pump will 'torque' quite noticeably and as you've noted I've made to myself how hot the lines are while running.

In addition to that I've even had the return line from the injectors that shouldn't need a clamp push off and spray fuel across the engine bay.

If you wouldn't mind sharing, what is the test/check with VCDS that can verify this even further while I'm waiting for a new metering valve?

The metering valve that came with the kit is 0 928 400 751. Do you know if that was the same as yours?

Hopefully you've helped me sleuth this one out.

 

[catdaddyrachel]

Not going to lie but I'm happy that I've come across your post. Everything that you posted is comparable to what I'm experiencing with my 2011 Jetta and I purchased the kit through Cascade. Not sure if this adds to your view of the wrong FMV but one of the things that I'm noticing is the hose that connects to the cp3 from the aux pump will 'torque' quite noticeably and as you've noted I've made to myself how hot the lines are while running.

In addition to that I've even had the return line from the injectors that shouldn't need a clamp push off and spray fuel across the engine bay.

If you wouldn't mind sharing, what is the test/check with VCDS that can verify this even further while I'm waiting for a new metering valve?

The metering valve that came with the kit is 0 928 400 751. Do you know if that was the same as yours?

Hopefully you've helped me sleuth this one out.

You’d have to go into the advanced measuring and you can monitor the specified fuel pressure vs the actual fuel pressure.

 

[catdaddyrachel]

One more thing to note. If your original CP4 pump cross the bed, expect to but at least 3-4 new filters and change them about every 200 miles after the change. also check the fuel rail solenoid for little fragments that will inevitably make there way there. I hope this helps someone.

 

[Seno]

I fixed the problem and I have some important notes for anyone running into the same issue.

I replaced both the sensor and the solenoid on the fuel rail, both did not fix the problem. I was able to source 928 400 643 FMV from Lithuania and replaced the part and now everything works as advertised. 50 miles today and still no issues. If you happen to run into this problem, here is a sure fire way to isolate a incorrect FMV. If the FMV is wrong, the fuel lines will become boiling hot after just a few minutes of the car being on. Within maybe 5 minutes, the entire fuel system will be too hot to touch. With the correct FMV, you should be able to comfortable touch the fuel lines and they will just be warm. Of course, verify with VCDS but this was the biggest difference i noticed after the fix.

Also, If anyone buys their kits from Cascade German, buy with caution. Apparently they are 3rd party sourcing their pumps and not confirming if the pumps are BMW R70 pumps. I was speaking w/ fisher and he told me that the pump that Cascade sold me came off a Puegot, not a BMW. if you get one without 928 400 643 FMV , it;s not a BMW pump and the FMV will have to be replaced.

Lastly, I'm not sure if Cascades customer service has been hit or miss recently but after I told him there was a problem with the kit, he stopped responding to emails all together. Perhaps this is a one-off or maybe something is going on over there but just keep in mind that this could happen to you.

What is correct FMV ? I think I may have some problems

 

[McGuirk]

Cascade German says 0928400751. This is for the BMW R70 pump. The poster above had luck with 928400643. Either way, if your NOT stock and have a tune you will most likely need an update to that tune. On my last install I did with the BMW kit Fisher Motor works did the tuning and it was the 0928400751 valve.
I'm about to do another install here and it will be with the 0928400751 valve on an R70 pump.

 

[Seno]

Thanks i just bought one from Amazon 0928400643 installed but still getting same code p0088 including fuel temperature sensor which is also new

Cascade German says 0928400751. This is for the BMW R70 pump. The poster above had luck with 928400643. Either way, if your NOT stock and have a tune you will most likely need an update to that tune. On my last install I did with the BMW kit Fisher Motor works did the tuning and it was the 0928400751 valve.
I'm about to do another install here and it will be with the 0928400751 valve on an R70 pump.

 

[McGuirk]

Thanks i just bought one from Amazon 0928400643 installed but still getting same code p0088 including fuel temperature sensor which is also new

Not sure about that valve. You may need a tune update for that part number. The poster above said they had luck with that one but depending on the exact setup YMMV. Also, are you running the R70 pump off the BMW or the European cp3 with the integrated boost pump?

 

[Seno]

Not sure about that valve. You may need a tune update for that part number. The poster above said they had luck with that one but depending on the exact setup YMMV. Also, are you running the R70 pump off the BMW or the European cp3 with the integrated boost pump?

to be honest i dont know what i have i bought it like that from the guy as a project car and i fixed a lot of other things i just remember he mentioned some thing about united diesel and whitbread.

 

[McGuirk]

to be honest i dont know what i have i bought it like that from the guy as a project car and i fixed a lot of other things i just remember he mentioned some thing about united diesel and whitbread.

If he said whitebread it's the European cp3 with the integrated boost pump. Having this pump requires you to remove the stock fuel boost pump. Also, with this pump you want to run the fuel filter as a straight in line filter or you end up getting low rail pressure codes. I can take a picture of my filter setup and post it for you. Basically your hooking up the rail return directly to the tank return. Then loop the two filter ports that are not needed. The filter inlet port is still hooked to the incoming from the tank. The outlet then goes to the cp3. This setup allows for proper head pressure to be maintained to that cp3 pump. Note: this info does NOT apply to bmw R70 pumps!

 

[McGuirk]

to be honest i dont know what i have i bought it like that from the guy as a project car and i fixed a lot of other things i just remember he mentioned some thing about united diesel and whitbread.

so you can notice my cp3 has the extra bulge on the back with the cooling fins. That's the integrated boost pump on these European cp3. Also the fuel filter hose routing is how you want to rout yours. Just to add for anyone else trying to copy this routing, MAKE SURE you have the same filter housing as mine. There are a few different versions and their ports are NOT the same. If you rout the filter like this and delete your aux pump you should be getting no low pressure issues, even under WOT. Might even solve your high pressure issues but I'm not sure.

 

[Seno]

so you can notice my cp3 has the extra bulge on the back with the cooling fins. That's the integrated boost pump on these European cp3. Also the fuel filter hose routing is how you want to rout yours. Just to add for anyone else trying to copy this routing, MAKE SURE you have the same filter housing as mine. There are a few different versions and their ports are NOT the same. If you rout the filter like this and delete your aux pump you should be getting no low pressure issues, even under WOT. Might even solve your high pressure issues but I'm not sure.

 

[Seno]

My filter is little bit deferent with 3 ports not 4 like yours. each port has letters next to each others VT VM RM and on the side has this 5+/-Nm (5X) I'll try to find same as yours and see if is going to work. and i also have same cp3 pump with the cooling i took some pictures but i don know how to upload it on here

 

[McGuirk]

My filter is little bit deferent with 3 ports not 4 like yours. each port has letters next to each others VT VM RM and on the side has this 5+/-Nm (5X) I'll try to find same as yours and see if is going to work. and i also have same cp3 pump with the cooling i took some pictures but i don know how to upload it on here

You need to create an album and dump the pictures in there. Then you can copy and paste the picture link when you post.

I would download your manual from erwin.com and look up the exact port assignments for your housing in the service manual. But to start off what is your make/model/year? Also, is your aux fuel pump deleted?

 

[Seno]

You need to create an album and dump the pictures in there. Then you can copy and paste the picture link when you post.

I would download your manual from erwin.com and look up the exact port assignments for your housing in the service manual. But to start off what is your make/model/year? Also, is your aux fuel pump deleted?

I HAVE 2014 PASSAT 2.0 TDI AND AUX FUEL PUMP IS NOT DELATED DO I HAVE TO DO IT WITH VCDS OR JUST UNPLUG IT ?

 

[McGuirk]

I HAVE 2014 PASSAT 2.0 TDI AND AUX FUEL PUMP IS NOT DELATED DO I HAVE TO DO IT WITH VCDS OR JUST UNPLUG IT ?

So you have a CKRA engine which doesn't have an aux pump and isn't routed the same as the CJAA/CBEA. Was thinking you have the CBEA because this is the Audi A3 forum. At this point I would re post your issue in the Passat forum. I don't have any experience on the Passat, but sounds like you need to just get a tuner to tune for your specific part number on the metering valve but other Passat owners might have other ideas.