Power FC Idle surge Strange readings on injector duty
10-07-10, 06:36 PM
#1
Idle surge Strange readings on injector duty
Basically the tune was great all day. Running fine no lean spots while cruising or under boost. Good throttle transitions. I started it up about 20 minutes ago to take it around the block, and when I got back to the garage the Injector duty cycle reads 0.0% ( wide band is still reading A-OK at 13.5 AFR and it is still running the entire time) then it reads between 5-10% . All while it's revving up randomly to 2500. Any ideas, This is new to me. I'm gonna go check the plugs now. Thanks for the assist.
10-07-10, 07:13 PM
#2
Are you reading from the data logit or commander? Are all of the connections good? if you are using datalogit is the serial/usb connection solid and using correct drivers etc? if AFRs are OK sounds like a communication problem with whatever you are reading with... but this is just a guess...
10-07-10, 07:16 PM
#3
Are you reading from the data logit or commander? Are all of the connections good? if you are using datalogit is the serial/usb connection solid and using correct drivers etc? if AFRs are OK sounds like a communication problem with whatever you are reading with... but this is just a guess...
10-08-10, 08:43 PM
#6
well I'm getting a bad read on the fuel injectors from the commander, but that's ok. The idle is now holding at 2K after I start-up, and I'm pretty sure it's because of the ISC having crapped out. Car is still drivable and has NO lean spots
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10-11-10, 09:29 PM
#10
The commander is not working because you have the data logit running...
They use the same communication line and only one can talk at a time and the datalogit usually takes priority. Every once in a while you might get an update on the commander, but this is normal.
Do you have the advance items logged? the parameter Advance ???? or Advance ???? (2) is your idle speed control valve.
I image that is what is causing the reving, but I would like to know if it is causing the ramp up by opening, or cutting it down by closing? don't know which is the cart and which is the horse...
Have you set up the idle and completed the idlea learn procdures or is this out of the box operation?
They use the same communication line and only one can talk at a time and the datalogit usually takes priority. Every once in a while you might get an update on the commander, but this is normal.
Do you have the advance items logged? the parameter Advance ???? or Advance ???? (2) is your idle speed control valve.
I image that is what is causing the reving, but I would like to know if it is causing the ramp up by opening, or cutting it down by closing? don't know which is the cart and which is the horse...
Have you set up the idle and completed the idlea learn procdures or is this out of the box operation?
10-11-10, 09:47 PM
#11
The commander is not working because you have the data logit running...
They use the same communication line and only one can talk at a time and the datalogit usually takes priority. Every once in a while you might get an update on the commander, but this is normal.
Do you have the advance items logged? the parameter Advance ???? or Advance ???? (2) is your idle speed control valve.
I image that is what is causing the reving, but I would like to know if it is causing the ramp up by opening, or cutting it down by closing? don't know which is the cart and which is the horse...
Have you set up the idle and completed the idlea learn procdures or is this out of the box operation?
They use the same communication line and only one can talk at a time and the datalogit usually takes priority. Every once in a while you might get an update on the commander, but this is normal.
Do you have the advance items logged? the parameter Advance ???? or Advance ???? (2) is your idle speed control valve.
I image that is what is causing the reving, but I would like to know if it is causing the ramp up by opening, or cutting it down by closing? don't know which is the cart and which is the horse...
Have you set up the idle and completed the idlea learn procdures or is this out of the box operation?
10-11-10, 11:06 PM
#12
what happened when you unplugged the ISC? Did the idle stay high or continue to surge? what feedback(s) do you have turned on?
I am just guessing but I imagine either your isc valve is craping out, or you have a new vac leak that the PFC is over compensating for ? Could be going in and out of idle control... not sure exactlly how the PFC software works, we can only make educated guesses based on the behaviour. Arghx and Cewerx both have a lot of experience working with them and may have better handle on the specifics...
I am just guessing but I imagine either your isc valve is craping out, or you have a new vac leak that the PFC is over compensating for ? Could be going in and out of idle control... not sure exactlly how the PFC software works, we can only make educated guesses based on the behaviour. Arghx and Cewerx both have a lot of experience working with them and may have better handle on the specifics...
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