Jeep Cherokee XJ 97 Crank no start sometimes it sputters

[rainman]

Originally Posted by Lenny6

I checked for spark, have none. Checked for injector power, have none. When I turn the key really fast to start it tries to start but then nothing just crank and crank!! Oooo!! checked for power to the ecu, I have power. Changed CPS, fuel pump, I have pressure 49psi..

Lenny

There is only 12v+ to the injector when the fuel pump is running. ASD and fuel pump are energised together. asd provides power to coil+ve and injector +ve.

are the injectors clicking/ firing when you crank? you can feel it or hear it if u use a long screw driver up to yr ear. or use a node light

[alexbrown64]

Tony, the small sensor on the right is the obd1 temp sensor at the thermostat housing. We have two. The one at the back of the head is for the gauge. The one at the front sends messages to the pcm and controls aux fan.

Interesting to finally see what the fault is on Lens XJ. All these small problems go into the database and make life easier for all of us.

My XJ is finally running the best it has ever done in 12 years. I’m not touching it at the moment for fear of upsetting her.

Cheers,

[Lenny6]

Originally Posted by LuluBelle

Ok Lenny this might sound far out but it happened to me off the injector harness there is wires running down to you upstream O2 sensor if they are not in the correct position they can melt on the exhaust manifold and short blowing a fuse in the PDC? the big fuse box under the bonnet and no go?
Otherwise check all your sensors for a 5 volt circuit But that happened to me and took me ages to figure out
Good Luck
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_.(o)_)__(o)_)--o-)_)

All is good there just checked, I'm in the garage with the jeep now!

[Lenny6]

Originally Posted by awg

Hi Alex,

whats the small red box sensor on the front row (far right..lol) ?

Is that a Coolant Sensor ? ...(they changed for the '96 model)

I dont have a spare for that, but do for all the others..also have a PCM
...plug & play fault finding

@ the OP..yes you will need to check the cam sensor next with a multimeter
the procedure is detailed in the FSM, "Index", "Diagnostic, Ignition System"

download the FSM for free off the internet

What's "FSM"?

[LuluBelle]

FSM....... Factory Service Manual...
Here http://web.archive.org/web/201105132....com/tech.html
_____ooooo
/__l_l_,\____\,___
l_---l_l__l---[ ]llllll[ ]
_.(o)_)__(o)_)--o-)_)

[Lenny6]

Originally Posted by LuluBelle

Lenny did you check what rainman posted?
Check for Spark First if you go to a auto sparky it will cost you $$$ you can run all those tests yourself it could be something as simple as a bad coil or a cam sensor
_____ooooo
/__l_l_,\____\,___
l_---l_l__l---[ ]llllll[ ]
_.(o)_)__(o)_)--o-)_)

Yeah, checked them all,still crank no start..
Len

[Lenny6]

Originally Posted by LuluBelle

FSM....... Factory Service Manual...
Here http://web.archive.org/web/201105132....com/tech.html
_____ooooo
/__l_l_,\____\,___
l_---l_l__l---[ ]llllll[ ]
_.(o)_)__(o)_)--o-)_)

What do you believe? Under the hood I have 3 rivoted plates there, 1 with vin# and the year it was made I guess Says "97" Directly above that is a Plate says
"Built 96" and the 3rd Paint codes. So of the 3 which is it 97 or 96? What do you reckon?