I have a 1993 f250 with a fuel injected 351 and a 5 speed and headers. I recently moved to Las Vegas from Oregon. My truck runs fine in the mornings or when the temperature drops but during the day (when temperature reaches 107 or above) when it has been on a long run (usually worse in stop and go traffic) it begins to stumble. It will randomly drop 500 rpm during idle, then later it won't idle. I'll try to keep it running by feathering the gas pedal but eventually you can't and it will die. It is extremely difficult to restart. I recently discovered that sometimes it will start up just like nothing ever happened when I switch fuel tanks. I had it checked out and they said that the fuel pump was failing. They said that the fuel pressure started to drop and the pump wasn't running. The problem with that theory is that it does the same thing on both pumps and tanks no matter which one I start with. That tells me it's something shared by the two. I wrapped the fuel lines with heat tape in case of vapor lock. It has caused my spark plugs to go bad in cylinder 7 and 8. It will also back fire under the hood when I feather the gas.
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Re: high external temperature causes engine to die
Sounds like your ECT (engine coolant temp.) sensor has gone bad. What happens is when the truck is cold, the ECT acts like a choke on a carb. When the truck gets to operating temperature, the ECT tells the computer that it doesn't need the little extra fuel anymore. What's happening with your is the ECT isn't telling the computer that the engine is at operating temp. It's acting like the choke on the carb. is stuck shut. The computer is being told the engine temp is at 40 below still.
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Turn in the idle speed screw on the carburetor throttle-raise the idle some, it will open the throttle plate a bit when you turn the screw in. Idle speed should be about 800 rpm's, with truck in drive, foot on brake, and engine at normal operating temperature. If it still dies with the idle raised, it might need a tune-up-plugs, wires, dist. cap and rotor, and new filters. Good luck.
<p><b><u><span>Excessive fuel consumption and 'lumpy'
idling engine</span></u></b><br />
<p><b><span>Possible faults:-</span></b><br />
<p><b><u><br /></u></b><br />
<p><b><u><span>Coolant sensor </span></u></b><span><span> </span>- engine is signaled as being 'cold' all the
time, not just at start up, causing ECU to set longer injection cycle </span><br />
<p><span><span>ø<span> </span></span></span><span>Low coolant level can prevent sensor being able to detect coolant
<p><span><span>ø<span> </span></span></span><span>Faulty 'open' thermostat allows coolant to circulate without regulation
and perhaps prevents the engine from achieving normal running temperatures.</span><br />
<p><span> </span><br />
<p><b><u><span>FPR</span></u></b><span> - broken diaphragm allows fuel to enter
the vacuum line and then into the inlet manifold. Additional source of fuel
makes the fuel air mix richer causing a faster and lumpy idle.</span><br />
<p><span> </span><br />
<p><b><u><span>Vacuum leak </span></u></b><span>- 'high oxygen' signal
from O2 sensor causes ECU to set longer injection cycle.</span><br />
<p><span> </span><br />
<p><b><u><span>O2 sensor</span></u></b><span> - 'high oxygen' sensor error
causes ECU to set longer fuel injection cycle</span><br />
<p><span> </span><br />
<p><b><u><span>MAF</span></u></b><span> - 'over reads' in error the amount of air
entering causing ECU to set longer fuel injection cycle </span><br />
<p><span> </span><br />
<p><b><u><span>IAT</span></u></b><span> - 'under reads' in error the temperature
of incoming air causing ECU to set longer fuel injection cycle</span><br />
<p><span> </span><br />
ur car has dropped into 'limp home mode' by the sound of it. u need to plug the ECU into a diagnostic machine at a garage unfortunately. possibly an ignition or fuel system faulty. plugging the ECU into a garage computer will tell u the answers.
you may have a bad fuel pump or a bad injection pump,here are picture of the two, as far as the gauge you may have a bad fuel sending unit, this is in the tank and work like a toilet float and sends a signal to the gauge, the injection pump and fuel pump are located on top of motor you would need to have the preasure checked on both before just replace them hope this is helpful.
not too much work,the motor mounts-bell housing and crankshaft (for the flywheel off the 302)all should be the same.if the 351 had an automatic transmission,then you will have to add a pilot bearing to the end of the crank (center of crank where flywheel bolts on)..Also it depends on which oil pan is on the new engine--to follow the curve of the frame but should be the same as a 302....302 and 351 windsor engines are the same block except the intake manifold.Just a reminder,truck engines have a better cam for more torque.If the truck is fuel injected you will also have to change the computer which would be located drivers side left upper kick panel.The exhaust manifolds may be different,check them out before starting the procedure.
The most likley cause of this problem is the tank to tank switching valve. To check this, simply turn the key on, do not start the vehicle, And have someone switch the tanks back and forth. You should be able to hear and or feel the valve moving. It is located about half way down the inside of the drivers side frame piece.
It should actually be an oil sending unit, and is located on the back of the intake manifold to the left of the distributor.
*The P0523 is Oil Pressure Sending Unit Voltage too high
*P1693 Generic fault indicating a fault in the bus or PCM/ECM interface
*P1682 - I can't find this code
I will post here all the error codes for future reference.
Dodge Cummins Check Engine Error Codes
Cycle Key on-off-on-off-on to read codes in odometer display
P0002 ECM fuel calibration error
P0016 Crankshaft/Camshaft Timing Misalignment/Out-of- Sync
P0071 Ambient Temperature Sensor Performance / Rationality
P0072 Ambient Temperature Sensor Low
P0073 Ambient Temperature Sensor High
P0088 Fuel Rail Pressure Too High
P0106 Manifold Absolute Pressure Sensor Performance / Rationality
P0107 Manifold Absolute Pressure Sensor Low
P0108 Manifold Absolute Pressure Sensor High
P0111 Intake Air / Charge Temperature Sensor Performance / Rationality
P0112 Intake Air / Charge Temperature Sensor Low
P0113 Intake Air / Charge Temperature Sensor High
P0116 Engine Coolant Temperature Sensor Performance / Rationality
P0117 Engine Coolant Temperature Sensor Low
P0118 Engine Coolant Temperature Sensor High
P0121 Accelerator Position Sensor (APPS) Signal Voltage Too Low
P0122 Accelerator Position Sensor (APPS) LowAPPS Voltage Input Too Low
P0123 Accelerator Position Sensor (APPS) Signal Voltage Too High
P0128 Cooling System Error / Thermostat Rationality
P0148 Fuel Delivery Error
P0168 Fuel Temp Too High
P0169 Water-in-Fuel Detected For Too Long
P0192 Fuel Rail Pressure Sensor Low
P0193 Fuel Rail Pressure Sensor High
P0201 Fuel Injector 1 Circuit
P0202 Fuel Injector 2 Circuit
P0203 Fuel Injector 3 Circuit
P0204 Fuel Injector 4 Circuit
P0205 Fuel Injector 5 Circuit
P0206 Fuel Injector 6 Circuit
P0216 Fuel Injection pump Timing Malfunciton [new injector pump time]
P0217 Coolant Temperature Too High
P0219 Engine Overspeed
P0230 Transfer pump circuit out of range
P0234 Turbocharger Overboost Condition
P0235 Turbocharger Boost Sensor A Circuit
P0236 Turbocharger Boost Pressure Sensor Performance / Rationality
P0237 Turbocharger Boost Pressure Sensor Low
P0238 Turbocharger Boost Pressure Sensor High
P0251 Fuel Injection Pump Mechanical Failure Fuel Valve Feedback Circuit
P0252 Injection Pump Fuel Metering Control "A" Range/Performance
P0253 Fuel Injection Pump Fuel Valve Open Circuit
P0254 Fuel Injection Pump Fuel Valve Current Too High
P0300 Multiple Cylinder Misfire
P0301 Cylinder 1 Misfire
P0302 Cylinder 2 Misfire
P0303 Cylinder 3 Misfire
P0304 Cylinder 4 Misfire
P0305 Cylinder 5 Misfire
P0306 Cylinder 6 Misfire
P0335 Crankshaft Position Sensor Circuit
P0336 Crankshaft Position Sensor Performance
P0337 Crankshaft Position Sensor Circuit Low
P0338 Crankshaft Position Sensor Circuit High
P0340 Camshaft Position Sensor Circuit
P0341 Camshaft Position Sensor Performance / Rationality
P0370 Timing Reference High Resolution Signal "A"
P0380 Intake Air Heater #1 Control circuit
P0381 Wait-to-Start Lamp Inoperative
P0382 Intake Air Heater #2 Control circuit
P0460 Fuel Level Sensor A Circuit
P0461 Fuel Level Sensor 1 Performance / Rationality
P0462 Fuel Level Sensor 1 Low
P0463 Fuel Level Sensor 1 High
P0477 Exhaust Pressure Control Relay Low
P0478 Exhaust Pressure Control Relay High
P0480 Cooling Fan 1 Control Circuit/Open (Low Speed Fan Relay)
P0483 Cooling Fan Speed
P0500 Vehicle Speed Sensor 1 Circuit, or No Vehicle Speed Reference Signal 1
P0514 Battery Temperature Sensor Performance / Rationality
P0516 Battery Temperature Sensor Low
P0517 Battery Temperature Sensor High
P0521 Oil Pressure Sensor Performance / Rationality
P0522 Engine Oil Pressure Sensor/Switch Circuit Low Input
P0523 Oil Pressure Sending Unit Voltage too high
P0524 Oil Pressure Too Low
P0532 A/C Pressure Sensor Low
P0533 A/C Pressure Sensor High
P0541 Intake Air Heater Relay 1 Low
P0542 Intake Air Heater Relay 1 High
P0562 Battery Voltage Low
P0563 Battery Voltage High
P0572 Brake Switch 1 Low
P0573 Brake Switch 1 High
P0576 Cruise Control Input Circuit Low
P0580 Speed Control Multiplexed Switch 1 Low
P0581 Speed Control Multiplexed Switch 1 High
P0602 Control Module Programming Error/NotProgrammed
P0604 Internal Control Module RAM Integrity Failure
P0606 Internal ECM Processor
P0607 ECU Internal Performance
P0622 Generator Field Control Circuit
P0628 Fuel Pump Relay Circuit Low, or Fuel Lift Pump Control Circuit Low
P0629 Fuel Pump Relay Circuit High, or Fuel Lift Pump Control Circuit High
P0630 VIN Not Programmed in PCM
P0633 SKIM Key Not Programmed in PCM
P0642 Sensor Reference Voltage 1 Circuit Low
P0643 Sensor Reference Voltage 1 Circuit High
P0646 A/C Clutch Relay Circuit Low
P0647 A/C Clutch Relay Circuit High
P0652 Sensor Reference Voltage 2 Circuit Low
P0653 Sensor Reference Voltage 2 Circuit High
P0698 Sensor Reference Voltage 3 Circuit Low
P0699 Sensor Reference Voltage 3 Circuit High
P0700 Transmission Control System (MIL Request)
P0743 Torque Converter Clutch Circuit Electrical
P0753 Shift Solenoid "A" Electrical
P0837 Four Wheel Drive (4WD) Switch Performance / Rationality
P0838 Four Wheel Drive (4WD) Switch Circuit Low
P0839 Four Wheel Drive (4WD) Switch Circuit High
P1488 Auxiliary 5 volt supply output is too low
P1492 Ambient/batt temp sensor volts too high
P1493 Ambient/batt temp sensor volts too low
P1596 Speed Control Switch always high
P1597 Speed Control Switch always low
P1652 J1850 Communication Bus
P1687 No Cluster BUS Message or No Messages from the Mechanical Instrument Cluster
P1688 Internal Fuel Injection Pump Controller Failure
P1689 No Communication Between ECM & Injection Pump Module
P1690 Fuel injection pump CKP Sensor Does Not Agree With ECM CKP Sensor
P1691 Fuel Injection Pump Controller Calibration Failure
P1693 Generic fault indicating a fault in the bus or PCM/ECM interface
P1757 Governor pressure is above 3 PSI when 0 PSI is requested
P1762 Governor Press Sensor Offset Volts Too Low or Too High
P1765 Transmission 12 volt supply relay control circuit
P2121 Pedal Position Sensor 1 Performance / Rationality
P2122 Pedal Position Sensor 1 Low
P2123 Pedal Position Sensor 1 High
P2127 Pedal Validation Switch 2 Low
P2128 Pedal Validation Switch 2 High
P2146 Fuel Injector Group 1 Supply Voltage Circuit
P2149 Fuel Injector Group 2 Supply Voltage Circuit
P2266 Water in Fuel Sensor Circuit Low
P2269 Water in Fuel Condition
P2502 Charging System Output Voltage
P2503 Charging System Output Low
P2504 Charging System Output High
P2509 ECM/PCM Power Input Signal Intermittent
P2607 Intake Air Heater Relay 2 Low
P2608 Intake Air Heater Relay 2 High
P2609 Intake Air Heater System Performance
Hope this will help you.