craig12895 Posted April 5, 2020 Report Share Posted April 5, 2020 Been having some issues with a long cold start and hot cranking on my PNP G4+ (my car is a g35 sedan using the 350z G4+). I thought these were initially linked to an RPM limit triggering issue I was having originally. I have since changed out the camshaft and crankshaft sensors with brand new Hitachi (OEM) sensors and the rpm triggering issue has not arisen again. However, I do still have an issue with excessive cranking when cold and a lack of start when the car is warmed up. While I was out today I noticed that when I was starting the car when hot the Engine Kill was switched 'ON' and FuelCut would go to 100%. Then I realized that when Im doing this, Im simply turning the key one notch to turn the car off and restart it (i.e. I'm never removing the key). I cranked it a few cycles and everytime Engine Kill would switch ON. Then I decided to remove the key entirely and reinsert an attempt to start the car. This time, Engine Kill never came 'ON' and the FuelCut nstayed at 0% and the car fired right up. Any idea what may be triggering it to Engine Kil when I dont remove the key? I went through the fuel cut menus and didnt see anything blatantly obvious. In the event that it is helpful,I am attaching 2 logs. One of them is titled "hot cranking" which is when I never removed the key and Engine Kill reads 'ON'. The other log was recorded immediately afterwards when I removed the key. 20200405 Hot Start.llg 20200405 Hot Cranking.llg Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 6, 2020 Report Share Posted April 6, 2020 You have a CAN anti-theft request active in the hot cranking log, this is a message that comes from the immobilizer to tell the ECU if it is permitted to start or not. It is possible that the G35 immobilizer is a bit different than the 350Z in this regard. The quick fix will just be to turn off this feature. Go to >chassis & body > Anti-theft and set allow CAN anti-theft request to no. Quote Link to comment Share on other sites More sharing options...
AbbeyMS Posted April 6, 2020 Report Share Posted April 6, 2020 Just to clarify the G35 Nats works the same as the 350Z set up. Quote Link to comment Share on other sites More sharing options...
craig12895 Posted April 10, 2020 Author Report Share Posted April 10, 2020 Just following up that switching the CAN anti-theft request to no has fixed the starting issue thus far. Still have a bit of a long cold start but I believe it takes a while for the triggers to activate. Will continue to mess with cold start to see if I can improve it at all. But thanks for the anti-theft assistance! Quote Link to comment Share on other sites More sharing options...
pvainola Posted May 30, 2020 Report Share Posted May 30, 2020 I have a long cold start too and it can take a few attempts. With a warm engine it will start right up. I'm using E85. Quote Link to comment Share on other sites More sharing options...
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