I have a 94 GCL, and am stumped with a fuel problem. I have sense
changed the relay, filter and pump, and have not fixed the problem.
When i turn my ignition to st start position and leave it there,
depending on the temp. 5-40 mins. the fuel pump relay will begin to
click rapidly then slow down eventually quitting in which case the
check engine light copmes on and the fuel pump finally pre primes then
i can start it. I've heard that this may be in the case of a fauly
crank position sensor. I was looking for any other possible insight or
experience with this same problem.

 

Jeepster wrote:
> I have a 94 GCL, and am stumped with a fuel problem. I have sense
> changed the relay, filter and pump, and have not fixed the problem.
> When i turn my ignition to st start position and leave it there,
> depending on the temp. 5-40 mins. the fuel pump relay will begin to
> click rapidly then slow down eventually quitting in which case the
> check engine light copmes on and the fuel pump finally pre primes then
> i can start it. I've heard that this may be in the case of a fauly
> crank position sensor. I was looking for any other possible insight or
> experience with this same problem.

The 94 wiring is same as my 93.

The fuel pump and automatic shut down relays are fed by the ignition switch
and the ground is controlled by the computer. Apart from a failing sensor,
you could have corrosion in the harness or computer connector, or even a
faulty computer. Let's start with the codes.

What codes are you getting? http://revbeergoggles.com/engine_codes.html

Did you also check the fuses? There are three F3(20A), F8(60A), F15(30A)
in the power distribution block behind the battery.

--
DougW

 

Jeepster wrote:
> I have a 94 GCL, and am stumped with a fuel problem. I have sense
> changed the relay, filter and pump, and have not fixed the problem.
> When i turn my ignition to st start position and leave it there,
> depending on the temp. 5-40 mins. the fuel pump relay will begin to
> click rapidly then slow down eventually quitting in which case the
> check engine light copmes on and the fuel pump finally pre primes then
> i can start it. I've heard that this may be in the case of a fauly
> crank position sensor. I was looking for any other possible insight or
> experience with this same problem.

The 94 wiring is same as my 93.

The fuel pump and automatic shut down relays are fed by the ignition switch
and the ground is controlled by the computer. Apart from a failing sensor,
you could have corrosion in the harness or computer connector, or even a
faulty computer. Let's start with the codes.

What codes are you getting? http://revbeergoggles.com/engine_codes.html

Did you also check the fuses? There are three F3(20A), F8(60A), F15(30A)
in the power distribution block behind the battery.

--
DougW

 

Jeepster wrote:
> I have a 94 GCL, and am stumped with a fuel problem. I have sense
> changed the relay, filter and pump, and have not fixed the problem.
> When i turn my ignition to st start position and leave it there,
> depending on the temp. 5-40 mins. the fuel pump relay will begin to
> click rapidly then slow down eventually quitting in which case the
> check engine light copmes on and the fuel pump finally pre primes then
> i can start it. I've heard that this may be in the case of a fauly
> crank position sensor. I was looking for any other possible insight or
> experience with this same problem.

The 94 wiring is same as my 93.

The fuel pump and automatic shut down relays are fed by the ignition switch
and the ground is controlled by the computer. Apart from a failing sensor,
you could have corrosion in the harness or computer connector, or even a
faulty computer. Let's start with the codes.

What codes are you getting? http://revbeergoggles.com/engine_codes.html

Did you also check the fuses? There are three F3(20A), F8(60A), F15(30A)
in the power distribution block behind the battery.

--
DougW

 

DougW wrote:
> Jeepster wrote:
> > I have a 94 GCL, and am stumped with a fuel problem. I have sense
> > changed the relay, filter and pump, and have not fixed the problem.
> > When i turn my ignition to st start position and leave it there,
> > depending on the temp. 5-40 mins. the fuel pump relay will begin to
> > click rapidly then slow down eventually quitting in which case the
> > check engine light copmes on and the fuel pump finally pre primes then
> > i can start it. I've heard that this may be in the case of a fauly
> > crank position sensor. I was looking for any other possible insight or
> > experience with this same problem.
>
> The 94 wiring is same as my 93.
>
> The fuel pump and automatic shut down relays are fed by the ignition switch
> and the ground is controlled by the computer. Apart from a failing sensor,
> you could have corrosion in the harness or computer connector, or even a
> faulty computer. Let's start with the codes.
> What codes are you getting? http://revbeergoggles.com/engine_codes.html
>
> Did you also check the fuses? There are three F3(20A), F8(60A), F15(30A)
> in the power distribution block behind the battery.
>
> --
> DougW

Thanks man, but i haven't hooked it up to a diagnostic yet. that will
be done wed. the 6. i thought this would have been something more
simple but i guess it never is. Oh well thanks for the list of codes
though that will be very helpful. I'm begining to lean towards the pcm
my self. or a bad ignition. All the fuses are good ad i have changed
the relay. I am also off the cps as wll being is i found an order of
ignition opperations list adn it comes after the ernergizationof the
fuel pump relay. One more thing though i did botice a bust in the
return anti=-freeze hose beside the engine temp. sensor and some anti
freeze hit the sensor for sure. do you think this could have ruined the
sensor adn is keeping the pcm from activating the fuel pump. look in
this list and see what you think you opbviouslly know more about thiis
issue than i do and i appreciate all of your help. especiall after only
posting it last night.

Ignition Switch On:

This is an OPEN LOOP mode. When the SFI system is ACTIVATED by the
ignition switch, the following actions occur:

The PCM prepositions the idle air control (IAC) motor.
The PCM reads atmospheric air pressure from the manifold absolute
pressure (MAP) sensor and calculates the basic fuel strategy.
The PCM monitors the throttle position sensor (TPS) and engine coolant
temperature (ECT) sensor input. The PCM uses these inputs to modify
fuel strategy.
Intake air temperature (IAT) sensor is monitored.
ASD relay is energized for 3 seconds.
Fuel pump is energized for 1 second, unless engine is running or
cranking.
Oxygen sensor heating element is energized.

 

DougW wrote:
> Jeepster wrote:
> > I have a 94 GCL, and am stumped with a fuel problem. I have sense
> > changed the relay, filter and pump, and have not fixed the problem.
> > When i turn my ignition to st start position and leave it there,
> > depending on the temp. 5-40 mins. the fuel pump relay will begin to
> > click rapidly then slow down eventually quitting in which case the
> > check engine light copmes on and the fuel pump finally pre primes then
> > i can start it. I've heard that this may be in the case of a fauly
> > crank position sensor. I was looking for any other possible insight or
> > experience with this same problem.
>
> The 94 wiring is same as my 93.
>
> The fuel pump and automatic shut down relays are fed by the ignition switch
> and the ground is controlled by the computer. Apart from a failing sensor,
> you could have corrosion in the harness or computer connector, or even a
> faulty computer. Let's start with the codes.
> What codes are you getting? http://revbeergoggles.com/engine_codes.html
>
> Did you also check the fuses? There are three F3(20A), F8(60A), F15(30A)
> in the power distribution block behind the battery.
>
> --
> DougW

Thanks man, but i haven't hooked it up to a diagnostic yet. that will
be done wed. the 6. i thought this would have been something more
simple but i guess it never is. Oh well thanks for the list of codes
though that will be very helpful. I'm begining to lean towards the pcm
my self. or a bad ignition. All the fuses are good ad i have changed
the relay. I am also off the cps as wll being is i found an order of
ignition opperations list adn it comes after the ernergizationof the
fuel pump relay. One more thing though i did botice a bust in the
return anti=-freeze hose beside the engine temp. sensor and some anti
freeze hit the sensor for sure. do you think this could have ruined the
sensor adn is keeping the pcm from activating the fuel pump. look in
this list and see what you think you opbviouslly know more about thiis
issue than i do and i appreciate all of your help. especiall after only
posting it last night.

Ignition Switch On:

This is an OPEN LOOP mode. When the SFI system is ACTIVATED by the
ignition switch, the following actions occur:

The PCM prepositions the idle air control (IAC) motor.
The PCM reads atmospheric air pressure from the manifold absolute
pressure (MAP) sensor and calculates the basic fuel strategy.
The PCM monitors the throttle position sensor (TPS) and engine coolant
temperature (ECT) sensor input. The PCM uses these inputs to modify
fuel strategy.
Intake air temperature (IAT) sensor is monitored.
ASD relay is energized for 3 seconds.
Fuel pump is energized for 1 second, unless engine is running or
cranking.
Oxygen sensor heating element is energized.

 

DougW wrote:
> Jeepster wrote:
> > I have a 94 GCL, and am stumped with a fuel problem. I have sense
> > changed the relay, filter and pump, and have not fixed the problem.
> > When i turn my ignition to st start position and leave it there,
> > depending on the temp. 5-40 mins. the fuel pump relay will begin to
> > click rapidly then slow down eventually quitting in which case the
> > check engine light copmes on and the fuel pump finally pre primes then
> > i can start it. I've heard that this may be in the case of a fauly
> > crank position sensor. I was looking for any other possible insight or
> > experience with this same problem.
>
> The 94 wiring is same as my 93.
>
> The fuel pump and automatic shut down relays are fed by the ignition switch
> and the ground is controlled by the computer. Apart from a failing sensor,
> you could have corrosion in the harness or computer connector, or even a
> faulty computer. Let's start with the codes.
> What codes are you getting? http://revbeergoggles.com/engine_codes.html
>
> Did you also check the fuses? There are three F3(20A), F8(60A), F15(30A)
> in the power distribution block behind the battery.
>
> --
> DougW

Thanks man, but i haven't hooked it up to a diagnostic yet. that will
be done wed. the 6. i thought this would have been something more
simple but i guess it never is. Oh well thanks for the list of codes
though that will be very helpful. I'm begining to lean towards the pcm
my self. or a bad ignition. All the fuses are good ad i have changed
the relay. I am also off the cps as wll being is i found an order of
ignition opperations list adn it comes after the ernergizationof the
fuel pump relay. One more thing though i did botice a bust in the
return anti=-freeze hose beside the engine temp. sensor and some anti
freeze hit the sensor for sure. do you think this could have ruined the
sensor adn is keeping the pcm from activating the fuel pump. look in
this list and see what you think you opbviouslly know more about thiis
issue than i do and i appreciate all of your help. especiall after only
posting it last night.

Ignition Switch On:

This is an OPEN LOOP mode. When the SFI system is ACTIVATED by the
ignition switch, the following actions occur:

The PCM prepositions the idle air control (IAC) motor.
The PCM reads atmospheric air pressure from the manifold absolute
pressure (MAP) sensor and calculates the basic fuel strategy.
The PCM monitors the throttle position sensor (TPS) and engine coolant
temperature (ECT) sensor input. The PCM uses these inputs to modify
fuel strategy.
Intake air temperature (IAT) sensor is monitored.
ASD relay is energized for 3 seconds.
Fuel pump is energized for 1 second, unless engine is running or
cranking.
Oxygen sensor heating element is energized.

 

Also do you happen to know the id # for the computer of a 93 jeep 4.0L6
auto my 94 was a typo it is actually a 93 or maybe what all years
computers will work on mine

 

Also do you happen to know the id # for the computer of a 93 jeep 4.0L6
auto my 94 was a typo it is actually a 93 or maybe what all years
computers will work on mine

 

Also do you happen to know the id # for the computer of a 93 jeep 4.0L6
auto my 94 was a typo it is actually a 93 or maybe what all years
computers will work on mine