Jefferson.C Posted May 4, 2019 Report Share Posted May 4, 2019 This is a GTR RB26 I am working on. I seem to be having intermittent poor running conditions moments after cold start up and during the warm up. I have replaced the o2 sensor just to be sure and even turned off closed loop o2 while it's running poorly but makes no difference. Some days the start-up and warm up is right on my RPM target and gives me no problems. Other days however are not correct. I have changed my IAC valve to rule out a sticking valve but with no difference. I was lucky enough today to get a quick log of it's condition. See log 1 of a colder start and poor running condition. RPM's under target and after some slight rev's the RPMs drop significantly after closing the throttle. I do hold the throttle open a little at spots to keep it from idling too low for a cold engine. Log 2 showing after a few restarts and warmer ECT's it hold target RPMs and does not drop after slight revs. may3.llg may3warm.llg Quote Link to comment Share on other sites More sharing options...
Tim D Posted May 4, 2019 Report Share Posted May 4, 2019 Might be worth a look at idle ignition setup. Could you post a .pclr file. Quote Link to comment Share on other sites More sharing options...
Jefferson.C Posted May 4, 2019 Author Report Share Posted May 4, 2019 I have another CAS I'm getting tomorrow just to rule that out. I was going to try and turn the idle ign control OFF and put the IAC into test mode (so it's fully open) to rule out another sticking valve. GTRMay3.pclr Quote Link to comment Share on other sites More sharing options...
Tim D Posted May 4, 2019 Report Share Posted May 4, 2019 I think turning idle ign control OFF is a good starting point. I also think your idle ignition table is back to front... The timing should increase towards the right... (see extract from help file)... Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.