Need Help With Timing

[chrisk1500]

You have rotated the pump right?

Your idle fuel rate indicates a weak pump....and your pulse width is too long...

 

[BozemanBio]

I rotated the pump to driver's side and it helped a lot in starting the engine. I think the idle fuel pressure is poor due to having a bad OPS a while back. is it bad to let them idle rough due to that?

I keep reading over the previous posts in this thread about setting TDCO by revving the engine during Learn, and/or stopping the Learn early, but I'm not clear on how to do it.

Thanks, Paul

 

[NVW]

I rotated the pump to driver's side and it helped a lot in starting the engine. I think the idle fuel pressure is poor due to having a bad OPS a while back. is it bad to let them idle rough due to that?

I keep reading over the previous posts in this thread about setting TDCO by revving the engine during Learn, and/or stopping the Learn early, but I'm not clear on how to do it.

Thanks, Paul

When you see a TDCO value you want you can stop the learn procedure. Revving the engine will give you a more negative TDCO than it will at idle. Leo

 

[Acesneights1]

how good are your batteries and connections. New batteries brought my Inj pulse width back into spec from 2.02. Your ign voltage looks a little low.The screen shot shows no DTCS but not sure if it would show historic. Believe it or not the TDCO is within GMspec although not considered optimal according to those who tweak for performance. -1.94 might be a bit much as was mentioned by GMCTD if you are in cold climate. That fuel rate at Idle looks screwy.

 

[Acesneights1]

BB please update your signature so we know what flavor/yr of 6.5 we are advising on, what tool are you using to initiate the TDCO learn 12 psi for MAP at idle ????, that is 2500 rpm boost level, do you have any stored codes, TDCO won't happen if you have active codes, with 12 psi at idle I would suspect code P0236 to be active. 31.88 deg actual timing isn't right either for idle 8.5 to 12 should be max depending on your tune and if cold timing advance it still keeping engine revved up for warm up

His boost is OK. I don't know why but I read high on that too. I think the one that matters is the calculated boost. I am at 14.2 at Map / idle. Think you have to subtract soimething form that # to get actual. The PO236 is OBD2 You won't see that as a DTC in OBD1. That fuel rate looks really wrong though...