<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Thumper723</div><div class="ubbcode-body">About how much should the Ex Back pressure sensor cost?
Advance and Oreilly don't have it. Local dealer quoted $134 for it. </div></div>
About $134. /forums/images/%%GRAEMLIN_URL%%/smirk.gif /forums/images/%%GRAEMLIN_URL%%/grin.gif
You might get one cheaper from an online ford parts place like Powerstrokeshop.com (a site sponsor)
But that won't solve your no-start problem. The EBP sensor isn't involved in starting.
Ok, just to make sure I am on top of what is going on, from the looks of the tests, the IDM and PCM are both working as they should.
ICP is OK. Checked with mechanical gauge.Sensor matches. So that's OK
IPR DC% is OK. That combined with ICP, makes the IPR OK
EBP Sensor bad, but not needed to start.
Injectors "BUZZ TEST" OK, save #8. So the IDM is working.
CPS is OK. Getting RPM and good BIT.
The poppet valve in an injector was mentioned. In my understanding of the system, I would NOT have 2500 PSI on the rail if it was stuck, but will check tomorrow.
If someone could explain to me why the injectors cannot fire with a good signal, and 1500 psi minimum on the rail, it would be appreciated.
Is it possible for the disc the CPS reads to "jump time" ?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Thumper723</div><div class="ubbcode-body">If someone could explain to me why the injectors cannot fire with a good signal, and 1500 psi minimum on the rail, it would be appreciated.</div></div>Did I read that you have AutoEnginuity? If so, monitor the following while cranking:
Engine RPM (has to be at least 100)
Vpower (has to be 7 V min)
ICP (has to be 500 psi min)
injector pulse width (has to be 1-6 ms) No fuel command signal when ICP, RPM and VPWR signals are correct usually indicates a loss of CMP sync signal. Refer to Pinpoint Test «DG» for CMP sensor diagnosis.
A 1-6 mS fuel pulse width (FUEL PW) will be sent by the PCM to the IDM if system voltage does not go below 7 volts during cranking, engine cranking speed is above 100 rpm and injection control pressure is above 3450 kPa (500 psi). Even though a 1-6 mS fuel pulse width is shown on the NGS to be sent to the IDM, it is possible the IDM did not get the signal, due to a fault on either the CID (Cylinder ID) or FDCS (Fuel Delivery Command Signal)circuits or even the IDM. Note that low fuel pressure or no glow plugs could still be the cause of the No Start or Hard Start condition. A 0.60-ms fuel pulse width (a no fueling pulse) will be sent by the PCM when a sync pulse has not been received from the CMP sensor and if insufficient injection control pressure is present. This 0.60-ms fuel pulse width will not allow injectors to be enabled, but does keep the IDM and PCM synchronized until sufficient injection control pressure is realized.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Is it possible for the disc the CPS reads to "jump time" ? </div></div>Possible, but not probable.
You've replaced the CPS, but have you checked the connector and circuits? Your trouble may lie there.
What have you replaced so far? I am getting way lost in this thread. Post a summary of what you have checked.
The way I have read everything so far. You either need a new IPR or you need to pull injector O rings and check them. You can rebuild the IPR yourself, and if its full of crap it can easily give a no start situation.
Have you done a buzz test? If so, do they all buzz out with the same tone?
From the beginning, a summary of what I have checked.
Fuses/relays checked. Checked Good.
Fuel Pressure checked. 60psi at the bowl
CPS replaced with known good unit. No change.
CPS wires traced. No problems found.
Valve covers pulled, wires checked. No problems found.
HPOP output checked. 2500psi. Will develop 3800 with ICP pulled and IDM relay pulled.
HPOP checked on each side individually. Still checks OK.