Hi There,
I've just brought a 1995 GTS-T (S1 RE25DET), it's my 1st skyline and I’m loving it however I’m not loving the quirks it’s got. Currently it’s doing 250-300km per 60L tank!! L I’ve spent hours and hours poring over forums to try and get an understanding of how this could be happening but its only lead to more questions… So far I’ve checked the following things and have picked up two potential problems
Purchased Consult cable – all sensors bar the o2 one seem to be ok?
Coil packs running ok
AAC valve taken off, cleaned, tested, re-fitted
Idle adjusted
Injector cleaner run through system
new fuel filter
O2 SENSOR FAULTY?
I noticed the o2 sensor has some strange readouts when the engines going (driving)? I assumed the voltage would creep up the hotter it got but it flicks back and forth between 0.2-3 and 0.8v is that normal?
VCT/VTC PROBLEM?
The second thing I noticed it that it has a funny idle. It only seems to happen when it’s at operating temperature and the only way to describe it, is, it’s a bit ‘lumpy’. When looking at the live readout using the consult cable, the timing is all over the place 0deg-15deg. I’ve checked forums and from what I can gather it seems to be the VTC solenoid is stuck open? So I took it off today and yes its stuck open but here’s where it gets tricky… I tested the solenoid and when I apply 12v to the terminals the valve closes??? Interesting! I then put the solenoid back and started the engine, instantly lumpy, I applied 12v to the solenoid, valve closed and idle returned to normal, timing at a steady 15 deg, smooth as! WTF?
Now, on all the forums I have read people believe that the valve is closed then is opened by the ECU at 1050 until 4500 rpm for a midrange power increase. So why is my solenoid/valve doing the opposite? Is the ecu meant to supply power to it during idle to keep it closed? Then power off at 1050-4500rpm to allow the spring to open the valve?
I’m so confused!! any ideas about these two issues guys?
Thanks,
Nick