Hondata

Posted: **Wed Sep 16, 2009 8:45 pm**

02 Civic Si - PNF ECU
Kmanager 1.3.7.0
K24a2 swap, headers, exhaust, secondary o2 disabled, functioning cat...
K24a2 is stock (no vtc changes, no cams etc..)

Is it normal to have this sort of cam angle jitter as seen in my datalog? Cam is close to camcmd but it looks very wavy.

Posted: **Thu Sep 17, 2009 10:28 am**

No, that is not normal. Try cleaning the VTC solenoid and VTC filter (near #1 intake runner) to see if it helps.

Posted: **Thu Sep 17, 2009 7:52 pm**

Hondata wrote:No, that is not normal. Try cleaning the VTC solenoid and VTC filter (near #1 intake runner) to see if it helps.

I'll check these on the weekend.

I posted this on another forum and someone pointed out that ignition was doing the same thing in my datalog. If you put ignition together with the cam angle in a graph template, it seems they follow a similar pattern.

Posted: **Sat Sep 19, 2009 5:35 pm**

The VTC screen was dirty so I swapped it out. No change in the jitter. I then swapped out the VTC solenoid and the jitter was reduced by about 90-95%. I would have expected the problem to either go away completely or not at all..

One other thing I noticed is that camcmd doesn't follow what's in the table all the time. For example, I'll be in a 20 degree cam area for a few seconds and camcmd says 19. I think this is unrelated to the problem above but odd as well.

Any more suggestions?

Posted: **Mon Sep 21, 2009 10:37 am**

Cam position is interpolated from the different maps, so 19 when reading between the 10 and 20 table is normal.

Posted: **Fri Sep 25, 2009 7:20 pm**

Hondata, does the datalog look OK/normal now? Still seems abit abnormal to me.. Please review and let me know. I also checked and cleaned the two ground connections.

Posted: **Mon Sep 28, 2009 7:48 am**

Much better, but there are spikes every time you change gears. Run the car a little longer without uploading any calibrations, so that the ECU performs a longer learn cycle, and see if that helps.

Posted: **Tue Oct 27, 2009 3:09 pm**

EDIT - I am going to try an rsx-s/ep3 si vtc solenoid as I am running an EP3 harness on a TSX motor with a TSX solenoid. the TSX solenoid is the same part # as the '06+ si but NOT the k20a2 & k20a3 vtc solenoids

(before edit) well I am still having major issues with vtc jitter even after cleaning the solenoid & screen.

Posted: **Thu Oct 29, 2009 8:43 pm**

ok - problem solved! I decided to swap a used type R k20a "PNC" vtc solenoid into my k24a2 (w/ep3 harness) & the "jitter" is gone.

I am happy.

I have attached the datalogs (vtc set at 15 on full load). please forgive me for the partial tune you see. Should be street & dyno tuned week - I wanted to get this figured out 1st

Hondata

Cam angle "Jitter"

Cam angle "Jitter"