Looking for some ideas to check so throw at me.
We have a kseries turbo car that idles up and down on startup and fuel pressure goes up and down as well. Iacv blocked off and shut off on kpro. Checked for vac leaks over and over and there is nothing. Anyone have any pointers on what to check

Also last week we fired the car and it idle the same. We had a battery charger hooked up and for ***** and giggles turned the charger to 16v start and the idle smoothed right out...
Any suggestions?

 

have you tried the relearning process for k series throttle bodies. friend of mine had to do this when he got his zdx throttle body

 

When the idle is fluctuating, does battery voltage do the same? Could be your battery compensation table needing some work.

What fuel? What is your target idle speed? What AFR's does it bounce around? What injectors?

If it's something with 2,000cc injectors and a high base pressure, you may have to idle it a bit rich to smooth out. I have had a handful of cars with 2,000+cc injectors need to idle as rich as 12:1 to smooth out.

That would be a procedure for the electronic servo throttle bodies, not something like what the OP has.

 

ah cable throttle used. forgot bout that

 

C16 id2000 no iacv it bounces around everywhere on the afr and fuel pressure drops and comes back up. I'll try to richen up at idle and see if that helps. Thanks