jajohn
Veteran Member
Hi all,
My modified 2003 Golf has been throwing the P0401 'EGR : Insufficient flow' code for a couple of months now. I've been through the previous thread for this several times but I'm starting to hit my confusion/frustration limit so I thought I'd start a new one:
http://forums.tdiclub.com/showthread.php?t=227462&highlight=16785
Here's the setup:
178k miles
Upsolute 2 chip with PP520 injectors - on there a long time, no problems
OMI from Kerma - most recent update, but didn't throw the code until a couple of months after I installed it. This necessitated the removal of the sensor that normally plugs into the CCV return, currently hanging loose.
EGR mod done with VCDS (which I own)
Here's what I've tried so far:
- Cleaned the MAF with MAF spray cleaner (although turbo seems to work fine)
- Checked EGR diaphragm with Mityvac - it does move the lever when vac is applied.
- Cleaned EGR tube with coat hanger and compressed air, cleaned out gunk in EGR part of intake.
- Checked intake manifold: Buildup is not bad, approx 1/8 inch? So I didn't clean it.
- Replaced N18 valve
My current Group 003 log from a full throttle run is below.
What's next?
Thanks.
Time Engine Speed Air Mass Spec Air Mass Actual EGR Solenoid
0.01 903 290 445 84.5
0.35 903 290 475 84.5
0.68 903 290 475 84.5
1 1029 380 465 84.1
1.35 1008 480 475 77.3
1.66 1113 515 485 66.1
1.97 1071 570 525 64.5
2.32 966 720 490 4.8
2.65 1344 560 495 19.9
2.98 1680 525 530 23.9
3.33 2037 495 625 35.9
3.65 2352 475 760 69.7
3.98 2625 490 820 84.5
4.32 2961 650 885 83.3
4.63 3360 665 970 4.8
4.98 3780 850 810 4.8
5.31 3948 850 670 4.8
5.61 3423 325 490 4.8
5.96 2478 720 620 19.9
6.28 2709 775 750 4.8
6.59 2919 820 1050 4.8
6.95 3192 825 990 4.8
7.26 3465 830 945 4.8
7.58 3696 850 920 4.8
7.93 3948 850 905 4.8
8.26 4200 850 865 4.8
8.59 4389 850 855 4.8
8.93 4599 850 830 4.8
My modified 2003 Golf has been throwing the P0401 'EGR : Insufficient flow' code for a couple of months now. I've been through the previous thread for this several times but I'm starting to hit my confusion/frustration limit so I thought I'd start a new one:
http://forums.tdiclub.com/showthread.php?t=227462&highlight=16785
Here's the setup:
178k miles
Upsolute 2 chip with PP520 injectors - on there a long time, no problems
OMI from Kerma - most recent update, but didn't throw the code until a couple of months after I installed it. This necessitated the removal of the sensor that normally plugs into the CCV return, currently hanging loose.
EGR mod done with VCDS (which I own)
Here's what I've tried so far:
- Cleaned the MAF with MAF spray cleaner (although turbo seems to work fine)
- Checked EGR diaphragm with Mityvac - it does move the lever when vac is applied.
- Cleaned EGR tube with coat hanger and compressed air, cleaned out gunk in EGR part of intake.
- Checked intake manifold: Buildup is not bad, approx 1/8 inch? So I didn't clean it.
- Replaced N18 valve
My current Group 003 log from a full throttle run is below.
What's next?
Thanks.
Time Engine Speed Air Mass Spec Air Mass Actual EGR Solenoid
0.01 903 290 445 84.5
0.35 903 290 475 84.5
0.68 903 290 475 84.5
1 1029 380 465 84.1
1.35 1008 480 475 77.3
1.66 1113 515 485 66.1
1.97 1071 570 525 64.5
2.32 966 720 490 4.8
2.65 1344 560 495 19.9
2.98 1680 525 530 23.9
3.33 2037 495 625 35.9
3.65 2352 475 760 69.7
3.98 2625 490 820 84.5
4.32 2961 650 885 83.3
4.63 3360 665 970 4.8
4.98 3780 850 810 4.8
5.31 3948 850 670 4.8
5.61 3423 325 490 4.8
5.96 2478 720 620 19.9
6.28 2709 775 750 4.8
6.59 2919 820 1050 4.8
6.95 3192 825 990 4.8
7.26 3465 830 945 4.8
7.58 3696 850 920 4.8
7.93 3948 850 905 4.8
8.26 4200 850 865 4.8
8.59 4389 850 855 4.8
8.93 4599 850 830 4.8