1995 Disco starting issues
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Mudding
Joined: Dec 2010
Posts: 118
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From: Clarksville, Tn
1995 Disco starting issues
Well I am lost,
My Disco has to crank forever before it will start. I just replaced the alt. and battery. The fuel pump and filter are new, as well as the spark plugs, wires, cap and rotor. The timing is set at 5 degrees, and the fuel pressure is 36 psi. at idle. Once it starts it runs great, although the idle is a little rough at times. Any ideas what might be causing this?
Dodger
My Disco has to crank forever before it will start. I just replaced the alt. and battery. The fuel pump and filter are new, as well as the spark plugs, wires, cap and rotor. The timing is set at 5 degrees, and the fuel pressure is 36 psi. at idle. Once it starts it runs great, although the idle is a little rough at times. Any ideas what might be causing this?
Dodger
8th Gear
Joined: Mar 2011
Posts: 8
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From: Calgary Alberta, Canada
Does it have that same fuel pressure before starting after the key is turned on?Does it start sooner or better if you just touch the accelerator pedal enough to slightly open your throttle body?
Last edited by FERNO; Apr 10, 2011 at 12:22 AM. Reason: more info
Thread Starter
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Mudding
Joined: Dec 2010
Posts: 118
Likes: 0
From: Clarksville, Tn
the fuel pressure is 40 psi with key on engine off. Once it starts it runs between 36 and 38 psi at idle, if I disconnect the vacuum line from the fuel pressure regulator it goes back up to 40 psi. I replaced the only pump. I have not tried to press the pedal, I will when I go out today. I did remove and clean the idle air stepper motor, and it does idle better now. I was wondering if the engine coolant sensor could be a factor?
After reading the rave manual some more, it mentions the fuel temp sensor is used to improve hot starting. My truck start fine when it was cold out, only after it was a warm engine would it be difficult. Is there a way to check that sensor out?
After reading the rave manual some more, it mentions the fuel temp sensor is used to improve hot starting. My truck start fine when it was cold out, only after it was a warm engine would it be difficult. Is there a way to check that sensor out?
Last edited by Dodger; Apr 10, 2011 at 11:06 AM.
Super Moderator
Joined: Nov 2009
Posts: 5,847
Likes: 106
From: Arkansas
It could be. Shouldn't be TOO hard to check. The rave doesn't list specs for the 3.9, but does for the 4.0, but it looks like it's the same part at Atlantic British.
Here is what RAVE says:
As far as how the system behaves when the sensor faults, that may be different for the 3.9.
Here is what RAVE says:
Engine coolant temperature sensor (ECT Sensor)
This sensor consists of a temperature dependant
resistive metal strip. The resistance of the strip varies
considerably with coolant temperature, i.e. from 28K
ohms at - 30°C to 90 ohms at 130°C, and 300 Ohms
at 85°C. The ECT Sensor signal is vital to engine
running, as the correct fuelling is dependant upon
engine temperature i.e. richer mixture at low
temperatures. If the sensor is disconnected or failure
occurs a default value will be supplied to the system.
The initial default value selected will be based on the
value of the air intake temperature. This will increase
to a nominal warmed up value over an individual time,
programmed for each default value. The fault may not
be evident to the driver, there may be a hot restart
problem. The fault is indicated by illumination of the
malfunction indicator light (MIL) on North American
specification vehicles.
This sensor consists of a temperature dependant
resistive metal strip. The resistance of the strip varies
considerably with coolant temperature, i.e. from 28K
ohms at - 30°C to 90 ohms at 130°C, and 300 Ohms
at 85°C. The ECT Sensor signal is vital to engine
running, as the correct fuelling is dependant upon
engine temperature i.e. richer mixture at low
temperatures. If the sensor is disconnected or failure
occurs a default value will be supplied to the system.
The initial default value selected will be based on the
value of the air intake temperature. This will increase
to a nominal warmed up value over an individual time,
programmed for each default value. The fault may not
be evident to the driver, there may be a hot restart
problem. The fault is indicated by illumination of the
malfunction indicator light (MIL) on North American
specification vehicles.
Thread Starter
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Mudding
Joined: Dec 2010
Posts: 118
Likes: 0
From: Clarksville, Tn
Well problem found, turns out to be a bad fuel injector. It will not hold fuel pressure for more then ten minutes, it starts dropping fast till it gets to about 0 psi. So I removed the upper intake cover and bore scoped the intake runners and found it to be the number six fuel injector. Have a new set on order, I guess I will be riding the bike for a few days...
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Mudding
Joined: Dec 2010
Posts: 118
Likes: 0
From: Clarksville, Tn
I got a set of eight from Injector Warehouse - The Fuel Injectors You Need! for just under 400.00. They were easy to replace. Took about two hours counting the time it took to verify the fuel pressure was not leaking down anymore. Also now the pressure reads 39~40 at idle. Starts right up, and runs much smoother.
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