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Topic Review (Newest First)
12-24-2010 04:20 PM
xmark i fixed it, the little fuel line between the pump and sending unit was eaten up by this great gas we have now. replace the hose runs like new.
12-21-2010 08:53 AM
xmark ok well thanks guys for the info, i check hoses and for any codes, no codes fuel lines look good, i went with the fuel pressure regulator fisrt since it was the e-z est to get to. it seems to run better so far i am going to drive it to work today and see what happens. the pressure still bleeds off as soon as i shut down so i guess when i get the tank empty i will pull the tank and replace the fuel pump and sock, only thing left.
thanks again for the help.
ray1111 have you ever heard of yankee lake i have been there once or twice
12-20-2010 04:58 PM
Garyk There should be pressure in the line after you shut down, if not there is a leak in the line or at the pump. There is a test for the regulator too but can't recall it. A Haynes manual has all that stuff in it.
12-20-2010 03:40 PM
ray1111 My 93 sound like it's doin the same thing. I did a fuel pressure test and mine was at 31 with the vacuum line attached and 39 without it attached. I also let it sit for 1/2 hour and it didn't bleed off at all. It is suppose to bleed off slow. Did you look for any leaks in your line? My 93 will give me a computer readout if you turn you key on and off 3 times and leave it on the third time and watch you Check Engine Soon light blink. Count the blinks. it will blink a number of times then pause then blink a number of times again. blink blink pause blink blink is 22 and so on. when it hits 5 and 5 blinks thats the end of you code. I still haven't found out what wrong with mine.
Here's the codes:
Code Description
11* No crank reference signal detected during engine cranking.
12* Direct battery input to PCM was disconnected within the last 50 key-on cycles.
13** No difference recognized between the engine MAP reading and the barometric (atmosphereic) pressure reading at start-up
14** MAP sensor input below minimum acceptable voltage.
or MAP sensor input above maximum acceptable voltage.
15** No vehicle distance (speed) sensor signal detected during road load conditions.
17* Engine coolant temperature remains below normal operating temperatures during vehicle travel (thermostat).
21** Neither rich nor lean condition detected from the oxygen sensor input.
or
Oxygen sensor input voltage maintained above the normal operating range.
22** Engine coolant temperature sensor input above maximum acceptable voltage.
or Engine coolant temperature sensor input below minimum acceptable voltage.
23** Intake manifold air temperature sensor input above maximum acceptable voltage.
or
Intake manifold air temperature sensor input below minimum acceptable voltage.
24** Throttle position sensor input above maximum acceptable voltage.
or
Throttle position sensor input below minimum acceptable voltage.
25** A shorted condition detected in one or more of the idle air control motor circuits.
27* Injector #1 output driver does not respond properly to the control signal.
or
Injector #2 output driver does not respond properly to the control signal.
or
Injector #3 output driver does not respond properly to the control signal.
or
Injector #4 output driver does not respond properly to the control signal.
or
Injector #5 output driver does not respond properly to the control signal.
or
Injector #6 output driver does not respond properly to the control signal.
33* An open or shorted condition detected in the A/C clutch relay circuit.
34* An open or shorted condition detected in the speed control vacuum or vent solenoid circuits.
or
Speed control switch input below the minimum acceptable voltage.
or
Speed control switch input above the maximum acceptable voltage.
35* An open or shorted condition detected in the radiator fan relay circuit.
41* An open or shorted condition detected in the generator field control circuit.
42* An open or shorted condition detected in the auto shutdown relay circuit.
44* An open or shorted condition exists in the engine coolant temperature sensor circuit or a problem exists in the PCM's battery temperature voltage circuit.
46** Battery voltage sense input above target charging voltage during engine operation.
47** Battery voltage sense input below target charging voltage during engine operation. Also, no significant change detected in battery voltage during active test of generator output.
51** Oxygen sensor signal input indicates lean air/fuel ratio condition during engine operation.
52** Oxygen sensor signal input indicates rich air/fuel ratio condition during engine operation.
53* PCM internal fault condition detected.
54* No fuel sync (camshaft signal) detected during engine cranking.
55* Completion of diagnostic trouble code display on the malfunction indicator lamp (check engine lamp).
62* Unsuccessful attempt to update SRI (service reminder indicator) miles in the PCM EEPROM.
63* Unsuccessful attempt to write to an EEPROM location by the PCM.

* - Check engine lamp will not illuminate at all times if this code was recorded. Cycle ignition key as described and observe code flashed by check engine lamp.

** - Check engine lamp will illuminate during engine operation if this code was recorded.

PCM = Powertrain Control Module (the engine computer)
MAP = Manifold Absolute Pressure (the sensor that measures how hard the engine is sucking air through the intake manifold
EEPROM = Electrically Erasable Programmable Read Only Memory (a type of computer chip used inside the PCM)
12-19-2010 11:17 PM
xmark
fuel pressure test

i have a 94 yj 2.5 At5 that started running bad like running out of fuel in high gear on a pull, i did a fuel pressure test and seen 30 at idle and 38psi on hard pull. is that normal for this year i was told two differnt pressures.
also when you shut it off should the fuel pressure drop to 0 just that fast or bleed down slowly? i am looking at the pressure regulator
thanks for all your help

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