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Old 12-05-2017, 01:35 PM   #1
Wijesunde
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Quick question fuel!

Helloo
Can someone help me with this pls
First cold start of the day
Ignition on - engine not started yet

https://m.imgur.com/a/wgt9d

Fuel rail pressure actual suppose to be like this?
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Old 12-05-2017, 01:57 PM   #2
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yes, at key on /engine off, you are basically reading low pressure values in the fuel system since the HPFP is not creating increased pressure
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Old 12-05-2017, 02:27 PM   #3
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Aight man thanks for a quick reply
Fuel pressure regulator (key on /engine off)
https://imgur.com/a/hlUIQ
Normal?
When i start the engine the regulator mbar goesup slowly and the noise goes away with it
I am trying to find the cause of my cold start noise i think its definitly coming from my hpfp..

Is there any blocks i should look while key on /engine off before starting?
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Old 12-05-2017, 02:37 PM   #4
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Pressure will rise as the HPFP builds it. -31 Mbar (less than 1 PSI) is not far from zero at key off if the lp pump isnt running and has had time to bleed pressure.

Have you removed the pump and checked the cam follower for wear? There is also a chain tensioner under the HPFP housing that is a common failure on older engines
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Old 12-05-2017, 03:12 PM   #5
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I have checked the cam follower a month ago its was in good condition changed it to a new fallower.
the chain tensioner has been changed even the chain side casing its brand new..+ lpfp and fuel filter
Yesterday i took out hpfp again to check the cam follower its was in good condition.

I have already started a thread for this noise but still cant see where this coming from.. i got a feeling its the hpfp not operation correctly at the first start of the day.
Here u can check the my old thread http://www.golfmk5.com/forums/showthread.php?t=199706
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Old 12-06-2017, 11:16 AM   #6
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Quote:
Originally Posted by eurocars View Post
yes, at key on /engine off, you are basically reading low pressure values in the fuel system since the HPFP is not creating increased pressure


Shouldnít there be more pressure in the rail since it is a returnless system? I get the hpfp isnít running but it seems there should be more residual pressure than that in the rail. If the injectors arenít open and the hpfp is sealed the pressure has no where to go?


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Old 12-07-2017, 12:32 PM   #7
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The noise fade away when the rail pressure goesup after starting.
I have one error in vagcom about fuel pump relay j17
But this relay cant be found anywhere in my car..
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Old 12-07-2017, 12:34 PM   #8
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Where exactly is the noise coming from?


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Old 12-07-2017, 12:48 PM   #9
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Quote:
Originally Posted by Wijesunde View Post
The noise fade away when the rail pressure goesup after starting.
I have one error in vagcom about fuel pump relay j17
But this relay cant be found anywhere in my car..
Based on your scan this is a GTI so no fuel pump relay, you have a Lpfp control module instead.
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Old 12-07-2017, 01:22 PM   #10
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The noise is coming from the right side of the engine where the hpfp and cam chain..i get the noise only on first start of the day or if it has been sitting more than 8 hours..
Can some check normal fuel rail pressure with ignition on / engine off ? If you havnt started for awhile.

This is the error for j17
01259 - Fuel Pump Relay (J17)
009 - Open or Short to Ground
https://imgur.com/a/kNNrN

Last edited by Wijesunde; 12-07-2017 at 01:33 PM.
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Old 12-07-2017, 03:05 PM   #11
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Car has not been started in weeks, engine not running.











Noise is probably cam chain / tensioner.
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Old 12-07-2017, 03:34 PM   #12
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Thanks for your test
The whole cam n tensioner set has been changed 1000km ago because of this noise and still happening
Thats why i am going towards hpfp.
I see you get atleast 33bar (rail pressure actual)
I get only 4.5bar..that seems very low?

When i start the car rpm get around 1200 with the noise and rpm goes down to about 1100 for about 20-30 secnds stays there then goes down to normal around 730 and noise fades away.

And also if i start the engine maf unplugged i get no noise..i have no idea how maf can pull a startup noise
I dont have alot of engine knowledge

Last edited by Wijesunde; 12-07-2017 at 05:08 PM.
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Old 12-07-2017, 10:42 PM   #13
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Is the noise somewhat like a knock?


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Old 12-09-2017, 08:49 PM   #14
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Idk how i can call this noise..
https://youtu.be/e_SfZdq188o

Fuel system seems fine to me?
is there any blocks i should look at when starting?

I did the pcv test by blowing through it and it seems the pcv is bad.. should this effect engine on cold startup?

I get no click when i do output test on vag for n205 valve ?

Last edited by Wijesunde; 12-10-2017 at 08:44 AM.
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Old Yesterday, 10:21 AM   #15
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What the engine does when startingup with maf unpluged other than running on map sensor?
If i unplug the maf sensor and turns the engine on i get no rattle noise like in the video
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