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No spark help!

X

x91evo

NAXJA Forum User
Location
naxja sucks dick
Alright its been about a week already with this car and I am starting to loose hope for it.

2000 xj 175,000. 49psi fuel while cranking.
I can hear pump prime, ASD relay has been bypassed, swapped etc without any help. All fuses are good.
-Checked main sensor ground splice in harness everything is tight and clean.
-Triple checked all connections
-Opened up PCM to check for water/dirt, nada.
-P1492 batter temp sensor (under battery)
was touching both leads together I have since removed it for now.
What could possibly be left here to cause no spark?

New:
CrankPS, CamPS, coils, plugs gapped at spec
Data:
Crank sensor- 5V power, 5V signal (key on and crank)
No broken/chopped up wires from what I can see laying under the car.

Cam sensor- 5v power, 5V signal (key on and crank)
New synchonizer was clocked when installed car ran great.
I put cylinder #1 TDC and readjusted just to be safe nada.

Coil Connector-
From left to right here are the 4 pin readings while cranking

2.0V, 0.5V, 14v, 1.3V.

Is this what I should be seeing at the coil rail connector?

Somebody please give me some insight I am unemployeed right now and cannot afford to take this to a mechanic.
 
Ohmed signal wires for both sensors.
0ohms for crankPS to wire #8 C1
camPS and got 0.7ohms to wire #18 C1
Is that an acceptable tolerance?

With my meter referenced to the + positive battery terminal at the coil rail I get this.
While cranking
Pin 1- 9V
Pin 2- 12.19V
Pin 3- 0.02V
Pin 4- 11.5V

Resistance measurements at the coil rail
pin1 0.8ohm
pin3 0.8 ohm
pin4 0.7 ohm



Anybody have any idea?? I am so lost with this one
 
XJH-007;10033222(JeepForum) said:
I read somewhere that if the CPS shorts , it can take the PCM...so there's a good chance I fried it and took the PCM.
Click to expand...


When looking over the car, I noticed my BTS(battery sensor) and CrankPS both had multiple open wires near the head of the sensors- that may of shorted.

Add to that my possible issue with the charging voltage, and intermittent starting.

Should I go ahead and point my attention towards a PCM right about now?
 
Had intermittent starting for a while, hit a snow bank spun in 2wd at high RPM.
(beat the shit outta it)

Then when I let off the gas it refused to start back up
 
x91evo said:
Alright its been about a week already with this car and I am starting to loose hope for it.

2000 xj 175,000. 49psi fuel while cranking.
I can hear pump prime, ASD relay has been bypassed, swapped etc without any help. All fuses are good.
-Checked main sensor ground splice in harness everything is tight and clean.
-Triple checked all connections
-Opened up PCM to check for water/dirt, nada.
-P1492 batter temp sensor (under battery)
was touching both leads together I have since removed it for now.
What could possibly be left here to cause no spark?

New:
CrankPS, CamPS, coils, plugs gapped at spec
Data:
Crank sensor- 5V power, 5V signal (key on and crank)
No broken/chopped up wires from what I can see laying under the car.

Cam sensor- 5v power, 5V signal (key on and crank)
New synchonizer was clocked when installed car ran great.
I put cylinder #1 TDC and readjusted just to be safe nada.

Coil Connector-
From left to right here are the 4 pin readings while cranking

2.0V, 0.5V, 14v, 1.3V.

Is this what I should be seeing at the coil rail connector?

Somebody please give me some insight I am unemployeed right now and cannot afford to take this to a mechanic.
Click to expand...

Now this is the way to post a question on a hard to solve jeep problem!!!!:party:

PM Kastein and ask for his input on this one!!!
 
sidewaysstarion said:
Sounds like a cps, what's the story revolving around it not running.
Click to expand...

I have heard of many complaints about non-dealer CPSs being bad lately. I think the OP has ruled that out, but not sure?
 
Here is the coil rail pin out info.
Pin
1 IGNITION COIL NO. 1 DRIVER
2 FUSED AUTOMATIC SHUT DOWN RELAY OUTPUT
3 IGNITION COIL NO. 2 DRIVER​

4 IGNITION COIL NO. 3 DRIVER
​
​
Turn the ignition off.
Disconnect the coil rail harness connector.
Connect one end of a 12 volt test light to a good 12 volt source.​
​
​
​

Check the ignition coil driver circuits, with the other end of the test light, while cranking the engine.​

Does the test light blink/flicker?
If no, then the PCM is not firing the coil driver circuits... so it may be bad or not getting required input from Crank and Cam Position Sensors.
If yes, then coil rail must be bad if you have no spark.

 
Last edited:
Ecomike said:
Now this is the way to post a question on a hard to solve jeep problem!!!!
PM Kastein and ask for his input on this one!!!
Click to expand...

Thank you I try :) haha and I shall

Ecomike said:
I have heard of many complaints about non-dealer CPSs being bad lately. I think the OP has ruled that out, but not sure?
Click to expand...
Yup mine is a dealer part


McQue said:
Here is the coil rail pin out info.​

Pin​
​
​
Click to expand...
Well I already included this info on the above posts
 
I didnt mention;
NSS is bypassed

Coil rail resistance between pins is correct.
But I also have a brand new one that I installed (also had spec resistance) for laughs because wasting money is a great feeling.

I have this PCM sitting in front of me and I am so tempted to go buy one to try it.
I hope I can get somebody elses opinion before I throw away the rest of my savings
 
Well this is great Kastein says help from him is a no go.
I get flammed on several occasions, I flame somebody and now I am SOL.
Thanks guys I treat people how they treat me so if you didnt like how I acted towards you,
then that sucks for you because you raised a brow at me first.
 
Last edited:
Is the blinker fluid topped off???


just kidding.

Is the spark coming from the ignition coil? Is this new enough to have coil packs? I don't remember the generation years anymore. How far back have you traced the spark back? Ignition relay? Plug wires for sure good? You revved it out highly right? How high? Any way you could have blown it up?
 
McQue said:
Here is the coil rail pin out info.
Pin
1 IGNITION COIL NO. 1 DRIVER
2 FUSED AUTOMATIC SHUT DOWN RELAY OUTPUT
3 IGNITION COIL NO. 2 DRIVER​

4 IGNITION COIL NO. 3 DRIVER
​
​
Turn the ignition off.
Disconnect the coil rail harness connector.
Connect one end of a 12 volt test light to a good 12 volt source.​
​
​
​

Check the ignition coil driver circuits, with the other end of the test light, while cranking the engine.​

Does the test light blink/flicker?
If no, then the PCM is not firing the coil driver circuits... so it may be bad or not getting required input from Crank and Cam Position Sensors.
If yes, then coil rail must be bad if you have no spark.
Click to expand...

So how did this test work out? Or are you too busy melting down to follow the best advice in this thread?
 
x91evo said:
this forum is full of inexperienced shitheads
If you want some real answer go to cherokeeforum.com
Click to expand...
I wonder how that is going for you? If they are so good why did you come here from there?

PS: threatening to kill me and use the insanity defense via PM is the funniest thing I have read all week. Thank you, I needed a laugh :wave:

McQue's advise is indeed the best in the thread.
 
Wow, too many of the humans on this planet have issues. :wow:

I don't think the big stick works here, or gun boat diplomacy, try a carrot and walk softly?

Many of us here have had to solve these problems ourselves. And then we posted the history here to share for free with others. You are not the first to half to figure it out for yourself. But kicking rocks over here is not going to get you any decent advise from those that might know the answer, that I am sure of.
 
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