Jguyett
Active Member
- Joined
- Nov 24, 2022
- Messages
- 24
- Reaction score
- 1
- Location
- Manchester, NH, USA
- VCDS Serial number
- C?ID=530374 (NRRT)
Hey guys I’m new here and new to using VCDS, I’m a mechanic by trade and been into VW’s for over 12 years. I’m having an issue with my 2010 GTI that’s stumped me and I haven’t been able to get answers anywhere online.
I recently bought a fully built engine that was built by TJRC in CO about a year ago and sat ever since, never installed or ran.
Since the car has been running I've noticed when it's at full temp it has a strange knocking sound at idle and even while driving. It’s coming from the vacuum pump/HPFP area.
I also noticed the AFR and fuel trim seems to be kinda bouncing around which made me suspect the cam follower or vacuum pump affecting the HPFP. I had another HPFP and vacuum pump so I swapped those out and I didn't notice any difference so I replaced the cam follower with a brand new OEM one. I took some videos of the sound before I changed any parts and combined them into 1 video. I uploaded it to youtube, here is the link:
I then took a video of it running with the brand new cam follower:
It was actually louder with the new follower.
At idle
AFR is bouncing from 12-16
STFT bounces from like 0.9-1.10+
LTFT stays around 0.96-1.03
Just out of caution I did an oil pressure check, as I was getting the car hot it seemed to get a little louder.
Oil pressure ending up being perfectly within spec.
The AFR and FT started being even more erratic. I ended up getting some CEL codes - P0087 fuel rail/system pressure too low
P2293 - fuel pressure regulator 2 performance
So I decided to swap out the HPFP again to just be sure this one wasn’t bad.
Sure enough the shaft was sheared. This happened while the car was just sitting there idling.
So I put the other one in and at first everything was fine it sounded good the numbers were stable and perfect. Test drove it and it started getting louder and becoming erratic. So I parked it I’ll pull the HPFP out tomorrow to make sure it didn’t get sheared also. But now I’m thinking something might be wrong with the cam or timing…
Not sure what else would cause this. Like I said I’m new to VCDS specifically but I use complicated diagnostic software at work all the time. The only time I’ve had any codes has been when the HPFP actually broke, but I know there are probably things to check with VCDS to pinpoint where the issue is.
Any help is greatly appreciated.
Btw, all timing components, balance shafts are brand new and it’s timed correctly I confirmed it when I got the engine.
As far as mods, I can list the engine specs if needed but with the engine install I also installed a GTX3071r (CTS BOSS 600 kit) and AEM WMI kit, however I’ve unplugged the WMI to make sure that hasn’t been causing any issues.
And I’m running a base tune for this setup via Jared at Stratified.
I recently bought a fully built engine that was built by TJRC in CO about a year ago and sat ever since, never installed or ran.
Since the car has been running I've noticed when it's at full temp it has a strange knocking sound at idle and even while driving. It’s coming from the vacuum pump/HPFP area.
I also noticed the AFR and fuel trim seems to be kinda bouncing around which made me suspect the cam follower or vacuum pump affecting the HPFP. I had another HPFP and vacuum pump so I swapped those out and I didn't notice any difference so I replaced the cam follower with a brand new OEM one. I took some videos of the sound before I changed any parts and combined them into 1 video. I uploaded it to youtube, here is the link:
I then took a video of it running with the brand new cam follower:
It was actually louder with the new follower.
At idle
AFR is bouncing from 12-16
STFT bounces from like 0.9-1.10+
LTFT stays around 0.96-1.03
Just out of caution I did an oil pressure check, as I was getting the car hot it seemed to get a little louder.
Oil pressure ending up being perfectly within spec.
The AFR and FT started being even more erratic. I ended up getting some CEL codes - P0087 fuel rail/system pressure too low
P2293 - fuel pressure regulator 2 performance
So I decided to swap out the HPFP again to just be sure this one wasn’t bad.
Sure enough the shaft was sheared. This happened while the car was just sitting there idling.
So I put the other one in and at first everything was fine it sounded good the numbers were stable and perfect. Test drove it and it started getting louder and becoming erratic. So I parked it I’ll pull the HPFP out tomorrow to make sure it didn’t get sheared also. But now I’m thinking something might be wrong with the cam or timing…
Not sure what else would cause this. Like I said I’m new to VCDS specifically but I use complicated diagnostic software at work all the time. The only time I’ve had any codes has been when the HPFP actually broke, but I know there are probably things to check with VCDS to pinpoint where the issue is.
Any help is greatly appreciated.
Btw, all timing components, balance shafts are brand new and it’s timed correctly I confirmed it when I got the engine.
As far as mods, I can list the engine specs if needed but with the engine install I also installed a GTX3071r (CTS BOSS 600 kit) and AEM WMI kit, however I’ve unplugged the WMI to make sure that hasn’t been causing any issues.
And I’m running a base tune for this setup via Jared at Stratified.