Weird Timing Issues

[micksrb25]

Hey guys i recently did my 100,000 service and cleaned my throttle body at the same time. Since then my idle seems to go anywhere from 735-775rpm this doesn't bother me to much however at idle my timing is all over the place but only when the car has warmed up and has been revved a few times(figures are from an ecu consult display) Base timing was checked at completion of the 100,000 service and was 15 degrees. If i hold the accelerator anywhere else in the rev range the timing stays constant. It also stays constant when it is cold at idle and adjusts as the car starts to warm up. But as soon as it gets to about 72 degrees water temp when i give it a quick rev it doesn't return to 15 degrees at idle, it will read anywhere from 0-15 degrees and is constantly fluctuating.

Has anyone ever had this problem or knows what the problem might be?

The car is a 1996 GTS-T

[Moodles2]

With GTR's ITB, I've read you're not supposed to clean them as you are stripping away the seal on the butterfly shaft which lets air leak in. Perhaps something similar happened.

[XRATED]

check the CAS keyway hasn't slogged out.

[rob82]

R33 run delta ignition control to stabilise idle it will never read a constant 15degrees. If its lower than 15 then you may have a leak or too much bypass air if its above then you may need more bypass air.

[micksrb25]

I will check the keyway over the weekend. But if it was the keyway wouldn't the timing be erratic all the time?

[micksrb25]

Hmm funny you should say that rob82. Iv heard a hissing sound coming from the Egr valve since taking the rocker cover off. Maybe the egr valve is stuffed

[ClutchBurndout-:(]

i have a hissing sound to, whats the egr valve?

[micksrb25]

Oops my bad. I meant the pcv valve. It's on the side of your rocker cover sort of near the throttle body. It basically controls air going into the crank case

[XRATED]

I will check the keyway over the weekend. But if it was the keyway wouldn't the timing be erratic all the time?

Not really, when I had it- the timing issue was all over the place inconsistantly.