Just FYI that is normal for the elevated idle not to work above a certain temp, as it is different from a high idle. ECM controls elevated idle, not you. 
new duramax!
- Thread starter embs200
- Start date
got it scanned with tech 2 and gmc mechanic said my rail pressure was 11,000 psi and it looked like i had 2 or 3 bad injectors. he thinks it had dirty fuel or water ran through it. Does this sound about right or is it more likely that it has a bad cp3
http://i1265.photobucket.com/albums/jj520/embs2001/photo.jpg
these are the specs from tech 2, mechanic said i probly had dirty fuel and messed up all injectors or the two bad injectors with astrics are messeing with balance rates. he said i might be able to get away with just replaceing the two with astrics.
any imput?
these are the specs from tech 2, mechanic said i probly had dirty fuel and messed up all injectors or the two bad injectors with astrics are messeing with balance rates. he said i might be able to get away with just replaceing the two with astrics.
any imput?
my lly had same issue the main harness was loose where the blue connector hold the pins in from swaping the banks six gun out. we thought there was a bad injector cylinder due to faulty balance rates replaced injector and tested all cylinders before finding the loose connector. also a shim kit will help with the rail pressure.
A injector not firing can cause a knocking sound, it does sound like you have at least one bad injector. since you are already looking into EFI Live why don't you get it now so you can use the scan tool and data logging to help you troubleshoot you issue.
also have you changed your fuel filter and ran any dextron through your fuel system, ATF is a good detergent and will clean out your system quick, just don't use to much.