Cranking but not firing..

Camoderek · #1 (**permalink**) 01-26-2011, 07:09 AM

I am sitting in a walgreens parking lot just drove up here just fine, I buy stuff come out and it won't start. It is cranking but won't catch, tach is working all gauges working fuel pump is humming.... Any suggestions before I call AAA??

melmount · #2 (**permalink**) 01-26-2011, 07:48 AM

is the wait to start light coming on? If not its a fuse but you must unplug the fuel heater bowl then fix the fuse.

Camoderek · #3 (**permalink**) 01-26-2011, 09:06 AM

Yeah wait light comes on

**dhanna6powerstroke** · #4 (**permalink**) 01-26-2011, 09:09 AM

You need to get a hold of a scan tool and monitor the ICP and IPR readings.

melmount · #5 (**permalink**) 01-26-2011, 09:10 AM

you can try unplugging the icp sensor and see if it starts. If its that with it unplugged it will o to a defualt setting which should idle the truck

**dhanna6powerstroke** · #6 (**permalink**) 01-26-2011, 09:23 AM

IPR needs to be at least 500 psi to start and the ICP needs to be at least .85 volts

**SCUFFY828** · #7 (**permalink**) 01-26-2011, 09:30 AM

Quote:

Originally Posted by dhanna6powerstroke

IPR needs to be at least 500 psi to start and the ICP needs to be at least .85

icp needs to be at least 500 and ipr should be no more than 45 percent to start , if ipr duty cycle goes to 85 percent then its closing off to far , and there is a problem, icp voltage may be around .85 to .90

**dhanna6powerstroke** · #8 (**permalink**) 01-26-2011, 09:34 AM

Quote:

Originally Posted by SCUFFY828

icp needs to be at least 500 and ipr should be no more than 45 percent to start , if ipr duty cycle goes to 85 percent then its closing off to far , and there is a problem, icp voltage may be around .85 to .90

Oops, I had those backwards.