Fuel Rail Pressure Test with VCDS by Ross-Tech

[@longgoneg60]

Great walk through, used on 06 BPY. I have a cyl 2&4 misfire. Plugs and coilpacks just replaced. I ran this test and was somewhat pleased to find I don’t have any leaking injectors. Now I can trouble shoot wiring. Thanks guys

[@hendersonjp]

nice to have you back .ace info thanks

[@kritikos986]

where you find all this code for the group???

[@necromastercz]

Hello, I have EA888 engine (1.8 TSi from 2010) and my appearance for group 106 is bit different - I can see here value "Fuel Temperature (calculated)" that shows temperatures about -50°C (yes minus 50). Any idea how is this temperature calculated? I have problems with extreme rough cold starts and this seems to be in relation with my problem. Thanks

[@jasonfoster8871]

What is the most common cause if the vehicle loses pressure after being shut off? Fuel pump check valve?

[@RossTechVCDS]

Leaking fuel injectors. IMHO, if one is bad, replace all of them at the same time. We've seen a lot of people pin down which injector is bad and replace it. Then 2 or 3 months later, another injector starts to fail and bleed out all the time.

[@jasonfoster8871]

Thank you. Ended up changing all 4 Injectors on your recommendation. Fuel trims now at 0.8-1.6 LTFT instead of - 20LTFT

[@markmacdonald188]

I done this test.. My rail pressure went up to 70+ Barr I have low rail pressure code. Been using Vfizz controller to access ECU data . Would the 70+ Barr be a false reading or is this working to factory design.

[@Exorcism47]

@@jasonfoster8871 you had (negative) -20 LTFT and the problem were the injectors?

[@repeater95]

@@Exorcism47 most likely

[@matedu4508]

Hello. I would like to know if it is possible to check the pressure from the oil pump for the engine, to see if it works within my parameters.Because I sometimes get a low oil pressure message.And I would like to know if with vag com you can check the pressure, and what are the values ​​that should be in an Audi Q5. Thank you

[@RossTechVCDS]

Most engine tend to not report oil pressure via the data port. Join our forum and post an auto-scan from your vehicle there for additional assistance. forums.ross-tech.com/forum.php

[@cesarjorgemurillobarientos1813]

very good my brother

[@clearkill1337]

I've noticed my values for group 230 are very low. Specified never exceeds 1.99 and actual is either 0 or .96 while group 140 actually shows proper rail pressure of at least 40bar

[@valentindobre9080]

Hy Ross… can u help me … i have golf 6 . 160 cp last 2 weeks i change high pump becouse i see leak petrol in oil and now i see … fuel rail when engine is off 49bar is go down …! High pump is new before that the old pump when i testing pressure is going up to 120 bar … what the problem i have ?

[@adrianculda2259]

I've got Sharan 2.0 2011,and have done everything you have said in the video, my fuel high pressure: actual value was 4700hPa at 84⁰ Coolant Temperature, after shut off the engine and start again but not the engine, the Fuel High pressure has decrease at 2200 hPa after 2 minutes, so didn't increased as you said in the video, could I have a problem? Thanks

[@Exorcism47]

Same here. 2.0 TFSI engine, fuel rail pressure slowly drops instead of going up with the engine warmed up. Checked each spark plug for gasoline smell, none had gasoline smell. Have you fixed the issue?

[@TheGorank1982]

​@@Exorcism47 same by me 1.4 tsi engine...

[@louisstroomer4220]

Tested my (suspected) Fuel Rail Pressure today the way you showed. My Passat has the 3.6 BLV engine and shows the engine light and idles pretty rough. During the test it shows a pressure of around 128 Bar. It doesn't tell me the specified pressure it should measure do I don't know for sure if it's to high - can you confirm please? After shutting the engine down the pressure drops to around 118 bar right away, then slowly rises up to around 128 again if I wait 10 minutes. Does that indicate a leak? If a fuel injector is bad, or a fuel injector gasket is blown, is there a way to tell? I noticed the lambda for both rails around 20 (and specification is -10 to +10, it says). Can you please advise? Thanks, Louis

[@FourRingsAuto]

Seen 3.6fsi with broken timing chain guides and fuel pump jumped timing. your high pressure fuel system is reverting to default running mode and operating at higher usual pressure due to this. Just a suggestion but I'm sure you've had it fixed by now.

[@Theoloop]

So mine stays steady for 5+ minutes and never rises. Are there other steps to diagnose further? 2.0t fsi, rough idle every once in awhile. New plugs coils and cleaned valves.

[@RossTechVCDS]

Our registered customers can get free vehicle support on our web forum: forums.ross-tech.com/forum.php

[@klisurski]

Theo Lupu I have 1.8tfsi and mine does even slightly drop after a minute from 39 to 36. I don't have any error codes. My engine is a bit rough in idle and I am suspicious. Did you find the problem?

[@EZ-D-FIANT]

Are you guys the people who sell vcds then. I just looked its about £650 uk which is a lot of money for me, I already have 2 otber diagnostic systems and neither recognises my 2013 2.0tdi golf, so if vcds comcomes with help Id alpre appreciate​@RossTechVCDS

[@djamel_bijoux]

On my 2011mk6 GTI I have a p2293 when the car gets to operating temperature it stall and won't start until it's cooled down any suggestions please ?

[@popmayhem7361]

Hi Ross-tech..tried to do this on a mk5 golf/rabbit and all the suggesed group numbers (106, 140, 141, 230) are blank (no readings) even on latest vcds. using micro-can cable. what would be the reason for this?

[@y.b.zgaim3766]

Allo there ,did you find the group numbers i have the same problem. ??

[@ww5220]

How long such 63bar shall last? Engine is cooling down, so it shall keep 40bar or can go lowe and how fast?

[@10Eight]

If the fuel rail is increasing in pressure the injectors are holding pressure. The question you should be asking is "How does a fuel rail work" The fuel rail builds and holds pressure for ever the whole fuel system is under constant pressure no vac. So there should always be some pressure in the rail. Once the car warms up turn off the car and the fuel pressure should rise due to "heat soak" gas expands under heat once gas cools down it shrinks.

[@ww5220]

@@10Eight Fuel pump in tank holds 7bar. How much shall keep high pressure pump and if this could go back to tank, as there is ni other way to decrease pressure as internal leak of HP pump or injectors. It can go only as backpressure to the tank.. But it shall?

[@GustavoFreeng]

What about Diesel? Is it the same??

[@jvecu94]

On Golf 7 2013 ,2.0 TDI what is the right value of fuel pressure? Mine is about 25.000-30.000kpa on 800rpm is that the right value?

[@daves2369]

Mine went from 36 to 42 after 4 mins. 2013 V6 Audi S5. Should it be higher? I smell fuel while driving plus fuel in oil.

[@senorslowbrz]

do a compression test. sounds like bad rings

[@KenyonPayne]

I bought a 2010 Passat CC and has a p0088 with rail pressure being at over 80bar at idle. What can I test to determine what's the problem?

[@IamJimhunder]

fuel filter could be 1 of the causes, it has a built it regulator and that may have failed.

[@KenyonPayne]

@@IamJimhunder the timing chain skipped a couple of teeth and fuel pump was overpressuring

[@IamJimhunder]

@@KenyonPayne oh dear how did you find that out?

[@redadiagnostic4631]

How you can know this code like 106... Can you help

[@racingjoe1]

My vcdd by Ross doesn't have "blocks" I'm stuck trying to read pressure in hpa. What the hell is hpa?

[@hookpaonline3349]

Hi , what about Audi A3 8l, 1.6 , 2001. I can’t find it

[@TheAbbott1986]

Can you test fuel pressure if car won't start ?

[@RossTechVCDS]

Sort of... you can see how much pressure is on the rail while cranking the engine over.

[@b0000stwagen]

@@RossTechVCDS is there a rule of thumb for fuel rail pressure when cranking? I have a crank, no start condition. Fuel rail pressure is only 5.7 bar when cranking.

[@TheSweetVillain]

@@RossTechVCDS Hello, is there a way to find what is the factory fuel pressure value for the CFHC 2.0 TDI Common Rail Engine ? At idle and with the engine warm or cold, IDE00188 Fuel high pressure : actual value indicates 319700 hPa, while IDE00589 Fuel pressure is fluctuating around 27580 kPa rel

[@brkbt93]

@@b0000stwagen someone said there should be at least 180bars of pressure for the injectors to start firing. Btw did u fix ur problem ? did u start u car ?

[@avantsautomotive6022]

Good job Jeff It was a hard lesson for me and you to come up with high pressure in the 140 block ???? Your welcome HAHAH Thank you for all your help on my issue with that a-6

[@RossTechVCDS]

Indeed. I had started on this video prior to those calls.... and went back and added the addition info and voice over after all that. Never stop learning because the Germans are always going change something. ST?ID=74546

[@Atrociousa3]

Is there a specific pressure it’s suppose to go to and stay at? After shut off my pressure can go up to 100bar

[@Wartai]

I would like to know too, what pressures it could attain if left longer, my MK6 GTI has gone up to 190bar? But no high pressure errors..

[@repeater95]

@@Wartaidid you find it is normal to have 190 bar ?

[@AngelFix]

How to check fuel pressure on audi a6 c6 3.0 tdi common rail pre facelift model?

[@stefanlazarevic2159]

i have A5 b8 2.0 tfsi, when i turn engine off my pressure went from 4000 to 1190 kpe after 5, 10 min ? what is the problem ? also have new injectors, coils and spark plugs. also my engine shakes every single day, no matter is it hot or cold. And also i have missfires on cylinder number 2, and few days ago i have check engine light and code is p0303, p0300 why ???

[@matedu4508]

AUDI Q5 2.0TDI 177CV QUATRRO

[@emiliofl554]

Hola como puedo graduar la egr, el cuerpo de mariposa y el acelerador del golf mk4 16c.c.16v 77kw motor bcb, con vag com. Gracias

[@hotelsromania]

La mine pe canalul 75 imi arata altceva