Having Trouble With Cas Timing

[DevinC]

I am trying to adjust the timing on my 97 C34 with the s2 RB25DET in it.

I was having detonation so I checked the timing and it was on the crank mark furthest to the right when looking at it from the front. Came like this from japan, ran great, quik and smooth with a bit of det only on WOT runs. I loosened the CAS and set it to the 4th mark from the left(15 deg). Car hesitates under medium to heavy throttle, no det sounds and also hesitates when cold at parking lot speeds.

I am still unsure which tps plug to unplug, when I unplug the brown lower one, the car just dies. So I set it with the grey upper plug unplugged, but I hear thats the kickdown, so its probly made no difference.

So which plug do I use to get base idle?

[coparts41]

I use the loop wire hanging out of the loom at the rear of the rocker cover,I don`t disconnect anything and also set the timing at 15 degrees, works fine for me, depends on what type of timing light that you have, what fuel are you using, what boost , all variables that can effect timing/performance etc

[DevinC]

Ok, I did try setting it without unplugging things, but the computer advances it or something and the marks go away. I downloaded the r33 and r34 fsm's and they both say unplug the tps brown plug, but my car dies with it unplugged, but my car has had issues with the idle swinging around when I first start it, but it always stays running. I figure I'm gunna give the Idle air valve a good cleaning and try unplugging the tps again.

I'll be running 94 octane which is close to 98 RON, but I wanna be safe for 91 incase I venture down to the states.

[hks33]

You should have 3 plugs in front of your inlet manifold disconnect the top black one then use a good timing light and run it off the white wire at the back of your rocker covers. Found a little shortcut by putting the timing light half on the wire you can get a accurate base timing readout instead of running it off cylinder 1.

[DevinC]

Thank You, but I think mine is pre- those 3 plugs. Harness connects right at the tps etc, but it is an s2 rb25 with no ignitor.

[DevinC]

Ok, cleaned the Idle control valve, got some good chunkies out of there, now I can unplug the tps without it stalling and set the timing, so its set properly now at 15. Hopefully solves my detonation issues.