Hi Rob,
Ninety Nine percent of the time it's Crankshaft Position Sensor:
http://www.off-road.com/jeep/cheroke...tdcsensor.html
The fuel pump should only run about three seconds every time the
ignition switch is turn to the on position, then quit if the engine has
not started.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

rs wrote:
>
> My 97 Wrangler Sahara 4.0 AT has quit running. Leading up to this,
> there were a couple of mornings when the idle was rough and I wuld have
> to keep my foot in the gas a little to keep her going but after a bit it
> would go fine. Then, last week at work, I started up and started to
> back out when it stalled. I opened the hood and jiggled and banged on
> everything I could see and checked all the fuses. Still nothing. Then
> after about thirty minutes, it just started up and ran home. The next
> day it wouldn't start and hasn't since. I noticed today that the fuel
> pump is running constantly while the key is in the on position and there
> is definitely fuel pressure at the rail. I pulled the coil wire and I'm
> not getting any juice to the distributor. Anyways, after reading around
> a little, i'm leaning to replacing the crank position sensor. Does
> anyone have any additional advice? Could a malfunctioning CPS make the
> brain think the fuel pump needs to run constantly? Any help is
> appreciated....Rob

 

Hi Rob,
Ninety Nine percent of the time it's Crankshaft Position Sensor:
http://www.off-road.com/jeep/cheroke...tdcsensor.html
The fuel pump should only run about three seconds every time the
ignition switch is turn to the on position, then quit if the engine has
not started.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

rs wrote:
>
> My 97 Wrangler Sahara 4.0 AT has quit running. Leading up to this,
> there were a couple of mornings when the idle was rough and I wuld have
> to keep my foot in the gas a little to keep her going but after a bit it
> would go fine. Then, last week at work, I started up and started to
> back out when it stalled. I opened the hood and jiggled and banged on
> everything I could see and checked all the fuses. Still nothing. Then
> after about thirty minutes, it just started up and ran home. The next
> day it wouldn't start and hasn't since. I noticed today that the fuel
> pump is running constantly while the key is in the on position and there
> is definitely fuel pressure at the rail. I pulled the coil wire and I'm
> not getting any juice to the distributor. Anyways, after reading around
> a little, i'm leaning to replacing the crank position sensor. Does
> anyone have any additional advice? Could a malfunctioning CPS make the
> brain think the fuel pump needs to run constantly? Any help is
> appreciated....Rob

 

Hi Rob,
Ninety Nine percent of the time it's Crankshaft Position Sensor:
http://www.off-road.com/jeep/cheroke...tdcsensor.html
The fuel pump should only run about three seconds every time the
ignition switch is turn to the on position, then quit if the engine has
not started.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

rs wrote:
>
> My 97 Wrangler Sahara 4.0 AT has quit running. Leading up to this,
> there were a couple of mornings when the idle was rough and I wuld have
> to keep my foot in the gas a little to keep her going but after a bit it
> would go fine. Then, last week at work, I started up and started to
> back out when it stalled. I opened the hood and jiggled and banged on
> everything I could see and checked all the fuses. Still nothing. Then
> after about thirty minutes, it just started up and ran home. The next
> day it wouldn't start and hasn't since. I noticed today that the fuel
> pump is running constantly while the key is in the on position and there
> is definitely fuel pressure at the rail. I pulled the coil wire and I'm
> not getting any juice to the distributor. Anyways, after reading around
> a little, i'm leaning to replacing the crank position sensor. Does
> anyone have any additional advice? Could a malfunctioning CPS make the
> brain think the fuel pump needs to run constantly? Any help is
> appreciated....Rob