Well I had a leak that I thought was a hole in the line supplying the rail. Turns out it was just a loose fitting where the front injector ties in to the rail.
Anyway, leak is fixed....the PROBLEM is NOT.
When the truck is at idle it sound loud as heck like a Ford or a big tow truck. ALSO I have lost alot of power and can no longer blow smoke. This all happened at once while going up an on ramp it was like someone threw a switch and 1/2 my power disappeared. Could this be a bad injector ?? It is NOT leaking fuel into the engine (at least nothing noticable in the oil).




Thanks for any help, Dan

 

Very well could be a rail relief valve stuck open. Any codes?

 

cel is not on, but i will pull codes to see

 

Ohh one more thing. With my quad box on 100 hp setting the truck is STILL weaker than stock and even on this setting I still blow NO smoke.
It has to be fuel related.



ONE more thing and DON"T yell at me...... Could all of this be due to a bad fuel filter ??? It hasn't been changed in about 55 ,000 miles., But I still don't see that causing this all of a sudden. ??????

 

Yeah, you're gonna get yelled at! Never wait that long! That would be the FIRST thing I would try.

 

Okay... Fuel filter changed (actually didn't look too bad)
Problem remains !!!
Also, the cel lit up after the filter change (I assume normal ???)
Pulled a code 0088 fuel rail pressure too high
and a code 0251 Injection pump metering control A

I would think the 0088 may be due to the quad box, but since I have NEVER thrown this code before I guess the quad would not be the problem. Would an injector not using up fuel cause the rail pressure to spike ??

 

Pull the Quad to rule it out......

It's weird to get a CP3 code. Driving around with a nasty filter for so long.....CP3 or injectors is a possibility. Go to the dealer and have then check injectors with a ODII, or get a laser heat gun and test individual cylinders via the exhaust manifold.

You can also try pulling injector harnesses. It will throw codes out the wazhoo but the truck can run off of 2 cylinders. If its running normally with one of the injector harnesses unplugged, then you know its an injector related to one of those harnesses.

Good luck. I had some weird noises a while back. Had some leaking injectors and clogged feeder tubes.

 

are you back up and running phil?

brett

 

Sounds like a FCA stuck, or shorted.


Symptom:
P0251-CP3 PUMP REGULATOR CONTROL
When Monitored and Set Condition:
P0251-CP3 PUMP REGULATOR CONTROL
When Monitored: When the ignition is on.
Set Condition: The ECM detects a discrepancy between the PWM supplied to the
Electronic Fuel Control Actuator and the PWM returned from the Electronic Fuel Control
Actuator.
POSSIBLE CAUSES
FUEL PUMP
(K181) FUEL CONTROL ACTUATOR DRIVER OPEN
(K31) RETURN CIRCUIT OPEN FROM FCA TO ECM
(K181) FUEL CONTROL ACTUATOR DRIVER CIRCUIT SHORTED TO EXTERNAL VOLTAGE
(K31) FUEL CONTROL ACTUATOR RETURN CIRCUIT SHORTED TO EXTERNAL VOLTAGE
(K31) FCA RETURN CIRCUIT SHORTED TO (K181) FCA DRIVER CIRCUIT
(K181) FUEL CONTROL ACTUATOR DRIVER CIRCUIT SHORTED TO GROUND
(K181) FUEL CONTROL ACTUATOR DRIVER CIRCUIT SHORTED TO ANOTHER CIRCUIT
(K31) FUEL CONTROL ACTUATOR RETURN CIRCUIT SHORTED TO ANOTHER CIRCUIT
INTERMITTENT CONDITION
ECM
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
Disconnect the Fuel Control Actuator (FCA) harness connector.
Connect an incandescent test light across the Fuel Control Actuator driver circuit
and the Fuel Control Actuator return circuit at the fuel control actuator harness
connector.
Observe the test light.
The ECM will perform a self test of the circuit which should momentarily flash the
test light brightly, one time, approximately 20 seconds after being connected.
NOTE: Check connectors - Clean/repair as necessary.
NOTE: Compare test light brightness to that of a direct connection to the
battery.
Did the light flash brightly?
All
Yes ! Replace the Fuel Pump.
No ! Go To 2
103
DRIVEABILITY - DIESEL
TEST ACTION APPLICABILITY
2 Turn the ignition off.
Disconnect the ECM harness connectors.
NOTE: Check connectors - Clean/repair as necessary.
Measure the resistance of the FCA driver circuit between the electronic fuel control
actuator harness connector and the ECM harness connector.
Is the resistance less than 10 Ohms?
All
Yes ! Go To 3
No ! Repair the (K181) Fuel Control Actuator Driver circuit OPEN.
3 Measure the resistance of the (K31) return circuit between the FCA harness
connector and the ECM harness connector.
Is the resistance less than 10 Ohms?
All
Yes ! Go To 4
No ! Repair or replace the engine wiring harness.
4 Measure the voltage between the (K181) FCA driver circuit in the FCA harness
connector and battery negative.
Is the voltage greater than 1 volts?
All
Yes ! Repair the (K181) FCA driver circuit shorted to external voltage.
No ! Go To 5
5 Measure the voltage between the (K31) FCA return circuit in the FCA harness
connector and battery negative.
Is the voltage greater than 1 volts?
All
Yes ! Repair the (K31) FCA return circuit shorted to external voltage.
No ! Go To 6
6 Measure the Resistance between the return circuit in the FCA harness connector and
battery negative.
Is the resistance less than 10 Ohms?
All
Yes ! Repair the (K31) FCA Return circuit shorted to (K181) FCA
Driver circuit.
No ! Go To 7
7 Measure the resistance between the (K181) FCA driver circuit in the FCA harness
connector and battery negative.
Is the resistance less than 10 Ohms?
All
Yes ! Repair the (K181) FCA driver circuit shorted to ground.
No ! Go To 8
8 Measure the resistance between the (K181) FCA driver circuit in the ECM harness
connector and all other circuits in the ECM connectors.
Is the resistance less than 10 Ohms?
All
Yes ! Go To 9
No ! Repair the (K181) FCA driver circuit shorted to another circuit.
104
DRIVEABILITY - DIESEL
P0251-CP3 PUMP REGULATOR CONTROL — Continued
TEST ACTION APPLICABILITY
9 Measure the resistance between the (K31) FCA Return circuit in the ECM harness
connector and all other circuits in the ECM connectors.8
Is the resistance less than 10 Ohms?
All
Yes ! Go To 10
No ! Repair the (K31) FCA Return circuit shorted to another circuit.
10 Reconnect the ECM harness connectors.
Ignition on, engine not running.
Disconnect the Electronic Fuel Control Actuator connector.
Connect an incandescent test light across the Fuel Control Actuator driver pin and
the Fuel Control Actuator return wire at the fuel control actuator connector.
Observe the test light.
The ECM will perform a self test of the circuit which should momentarily flash the
test light brightly, one time, approximately 20 seconds after being connected.
NOTE: Compare test light brightness to that of a direct connection to the
battery.
Did the light flash brightly?
All
Yes ! Refer to the INTERMITTENT CONDITION Symptom (Diagnostic
Procedure).
No ! Replace the ECM.
105
DRIVEABILITY - DIESEL
P0251-CP3 PUMP REGULATOR CONTROL — Continued

 

unplug the FCA. If the truck throws a code immediately for high rail pressure, the FCA isn't stuck.

 

If the quadzilla box is malfunctioning then it would cause this code to come up. This code is usually thrown at idle. Your FCA is most likely sticking. If it sounds like a 12V or powerjoke at idle your FCA is stuck. You can either R&R it or mod it if it isn't the solenoid. This would also explain the lack of power because the FCA is not going to max pressure at WOT.

 

Mod It ????

 

The Quad doesn't do anything to the FCA.

Modding the FCA won't fix this problem. The mod involves opening the hole in the piston to allow more fuel to the cp3. The code involved in this case concerns an electrical problem. Opening the hole up won't fix the electrical problem. Probably going to have to replace it. But run thru the diagnostics I posted to know for sure.

 

I appreciate the diagnostics and I am definately gonna run through them.
I do have one question though... Could this code have been thrown due to the leak I had (fixed) or the fuel filter replacement ? The reason I ask is that the light never came on til after these two things were done and I erased it and so far the light has not come back on. Of course I have only driven bout 1 mile since erasing code.
Just tryin to figure this out.

 

Have not gotten to run the above tests yet, nut here is some more info for any of you out there thinking what it could be.

The cel has NOT come on again since I erased the codes. I drove the truck to work and back today (about 120 miles total) Other than missing over 100 h.p , the truck seems completely normal. BUT I did notice that I can't get egt's over about 900 where as I used to be able to put them over 1200 at will. So I definately believe the problem is somehow fuel related, but I guess I will have to run the above tests.