Bloody P2293

[Ashanvale]

Hi to all forum with my first post. Was falowing this forum since i bought my Audi 5 month ago and get a lot of help. But its time to make a threat because neihter me nor my mechanics figure it out whats going wrong anymore..

so lets start; Note: Problem Solved i left this massage to future users for chekpoints

Audi A4 B7 2007 2.0T FSI Quattro Sedan Manual 6 Speed BWE Engine 200HP at 250.000km. Levoto LPG System installed

What has been done;

(Numbers with "x"means how many times its changed, last brand is final and on the car atm
)

1x All Spark Plugs (NGK İridium)

1x All Coil Packs (NGK)

1x Air Filter (MAN)

2x Engine Oil 5-40 (LiquiMoly Green)

2x Oil Filter (Man)

1x High Pressure Fuel Sensor (Bosch)

1x Low Pressure Fuel Sensor (Swag)

2x High Pressure Fuel Pump (Pierburg/Hitachi)

1x Cam Fallower (Swag)

3x Low Pressure Fuel Pump (Delphi/Delphi/Simens VDO)

1x Low Pressure Fuel Pump Control Module (Wisco)

1x Camshaft Position Sensor (Bosch)

1x Crankshaft Position Sensor (Bosch)

2x Fuel Filter (Man/Man)(6.0 BAR)

1x Injector on cylinder 1 (OEM Used) (was causing missfire)

1x Main Relays (Under ECU) (Bosch) (I dont have separate Fuel Pump Relay under dash)

3x Throttle Valfe Cleaning

3x İnjector Cleaning + Additive on Tank System Cleaning (LiquiMoly)

1x Secondary Oxygen Sensor B1S2 (Bosch)(was giving error codes)

1x Maf Cleaning (With LiquiMoly Maf Cleaner)

1x All Electrical Sockets Cleaned (LiquiMoly Electrical Contact Cleaner)

2x Carbon Cleaning

1x ECU Rewrite/Reflash to Orginal

Camshaft Lobe is Inspected and no wear its Ok

PCV Valfe İnspected/Tested and its Ok

Presurized air blowned from fuel pump outlet to front rail entry point no debris or clog seen

LPFP bottom filter controlled and its on place

Sender unit on the other side of tank controled and its ok no clog there too

Cheked all Fuel lines by 2 different mechanic...no bending, no damage nothing...

LPFP Control module tested with multimeter acording to audi procedure and its modulating voltage as described (5v on idle to around 7v on wot and back to normals)(car on neutral)

All adaptations done

Problem seen on Live Data;

LPFP Duty cycle is %50 on idle and goes around %95 on demand on road wot


While i falow live data i chek DutyCycle of lpfp, rail presure(low side) and rail presure (high side)

Whats happening is when on wot low presure side continously desending to 2 bar and after 4000rpm its drops below 1.2bar and sometimes less than 1bar (like 0.87bar)

And as soon as its drops under 2-1.5 bar, high presure side also starts declining from 110-120 bar to rapidly 90 50 30 to even single digits like 2bar and car starts to stalls jerks and sometimes enter in limp mode. And Sometimes it cannot recover and stops.

ECU only gives code p2293 low fuel presure regulation

Since i did everything related and cheked every aspect. im running out of options...

Before starting all over again i hope ppl with knowladge help me because this looks like a egzotic problem on my case

What i consider on future;

-T-line just before hpfp maybe cloged?/ Clog on mysterious unseen point?
-ECU cables to pump faulty maybe? (Without a code for it?)
-LPFP Control unit or pump goes out of power on wot? (Without a code for it?)

(Alternator and battery is fine btw)

Maybe take rs4 controller and make a custom map with it? (For a stock car?)
Or change map on deafult controller?? İ dont know even thats possible?

İts looks like my lpfp not delivering fuel nor holding pressure on Wot after 4000rpm witout a reason...

Car is completly fine under normal driving

i running out of ideas.. pls help

[Ashanvale]

Also i have to add;

İ cheked low presure side high presure side after turning off hot engine to see what physical valves doing

Due to heat expansion of fuel

High Side Starts rising 50 bar to until 127 bar and after that relief valve engages and drops it to around 100bar

Also Low Presure Side when it recives fuel from front after 6.7, 6.8bar starts regulating(regulator inside filter) and sends fuel back to tank.

So no leak seen on those too. They holds presure between limits pretty consistent

[Jayz691]

With your low side dropping, duty cycle maxing out, and a generic controller, id get a good controller. I know your stock atm, but id just get an r8 controller. Theyre not much more, and much better. Your low side is def not good. Thats my thoughts after a quick read..

Sent from my LM-G710VM using Audizine Forum mobile app

[Older_not_Wiser]

This ^^

Or camshaft lobe is wiped. How did you measure lift on cam fuel lobe? There is a diagram with measurements of the fuel cam lobe somewhere on this forum.

Or your low side restriction or clog theory might be a path to investigate more.

Definitely understand your frustration.

[Jayz691]

This. Wonder if anyone has verified this against a new cam.? Cuz I bought an AMC s3 intake cam, and hpfp lobe is not MUCH dif. Dee not the difference its supposed to be, according to this diagram of the stock cam lobe. But here it is.

Sent from my LM-G710VM using Audizine Forum mobile app
Attachment 290637

[Jayz691]

Sorry, its not clear. Its 42.5mm across, 3.5/8.75 are the thickness's, with a 5.25mm lift.

Edit: fixed the pic.

Sent from my LM-G710VM using Audizine Forum mobile app

[Ashanvale]

Well after this post i think i isolate the problem, well im not declaring victory yet still testing to if problem comes back or not.

Sorry for i didnt mention my car has a LPG system on it

after disconnecting my LPG system cables from car's ECU, problem disapear... Lp side doesnt drop blow 4bar on wot

My LPG system brand is Levoto "EasyFast" and it has guarantee. So of this is it then future investigating on their side.

İf anyone wonder Lpg system electrical relations with this cars;
Its Reads Drive data from OBD, Detects Rpm from ecu or ignition coils and gets between ECU to Injectors an High Presure Fuel Sensor.

I have no idea how its manages to ends up Lovering my lpfp.

***İt wasnt active btw i was using my car on Gasoline

İf i learn how and problem doesnt come back meanwhile. i will give feedback here

[Jayz691]

It has a propane kit?? Why?

Sent from my LM-G710VM using Audizine Forum mobile app

[Ashanvale]

Well because you can run at similar performance and nearly %50 cheaper per km with lpg

[Ashanvale]

İt apear that LPG ECU & its softwate Causing Problem. After changing ecu problem disapeared somehow but same software installed. so the problem re-apears but very rarely and only on traffic jam conditions. We will try new software to see what it does.

[Jayz691]

Well because you can run at similar performance and nearly %50 cheaper per km with lpg

Similar performance?? Really? Can ya do much with it, or basically gotta keep it stock? Just couldn't imagine running on propane, lol.

Sent from my LM-G710VM using Audizine Forum mobile app

[Ashanvale]

Why? u didnt see any propane runing car? U can run similar performance its not magic? İts just a different fuel

[Jayz691]

Why? u didnt see any propane runing car? U can run similar performance its not magic? İts just a different fuel

I just can't imagine it getting same performance, but I know nothing about LP cars. Your the first person I ever seen running it...
Different fuel can matter.. Compare pump gas to e85, pretty big difference.
Was just curious..
Sent from my LM-G710VM using Audizine Forum mobile app