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No fire at spark plugs point and no power st the pigtail of…

Customer Question
No fire at spark...

No fire at spark plugs point and no power st the pigtail of cks

Mechanic's Assistant: Is the power loss consistent, or does it fluctuate?

None at all

Mechanic's Assistant: What is the model/year of your Jeep?

01 Cherokee sport

Mechanic's Assistant: Are you fixing your Cherokee yourself? What have you tried so far?

Changed cks, cks and put new plugs thinking it was the sensor after still no fire I thought well check the actual connector. No power going to the connector

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

From the computer

Submitted: 6 months ago.Category: Jeep
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Answered in 8 minutes by:
7/29/2017
Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 6 months ago
Jaybird61
Jaybird61, ASE Certified Master Technician
Category: Jeep
Satisfied Customers: 2,302
Experience: Automotive Instructor at Palm Beach State College
Verified

Hi, My name is Jay

What engine do you have?

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Customer reply replied 6 months ago
4.0
Customer reply replied 6 months ago
It has no power at the crank position sensor coming from computer plugs are not firing. I know that derives from the crank position sensor not working. So root cause is that the connector has no power but why I'm lost.
Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 6 months ago

Did you check with key on to the orange wire?

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Customer reply replied 6 months ago
I checked all of them just to be sure nothing
Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 6 months ago

Also check same color wire at TPS and MAP sensors to see if they have power? Should be 5 volts.

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Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 6 months ago

Check fuses 8, 18 and 21 with key on in engine fuse box for power to them?

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Customer reply replied 6 months ago
With key on?
Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 6 months ago

Yes.

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Customer reply replied 6 months ago
Battery just went dead let me take this battery back and get a new one can I just message you back and you answer. Is this charging me 26 dollars every answer you give
Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 6 months ago

You are not charged per answer I give but for the questions and answer session on this question. I will be here when you get back just let me know.

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Customer reply replied 6 months ago
I do not see the final answer
Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 6 months ago
You were going to let me know after replacing battery
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Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 6 months ago
Did you check the fuses for power after battery was replaced
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Customer reply replied 6 months ago
they were good I have 5 volts on orange wire at computer rechecked the pigtail or connector at sensor with key in on position
Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 6 months ago

And did you have power at connector?

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Customer reply replied 6 months ago
Do I need to be starting it or just in the on position
Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 6 months ago

If you have power from computer then it should have power to connector with key on.

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Customer reply replied 6 months ago
It don't really read the same tho it's like 5 - 8 at computer
Customer reply replied 6 months ago
Jumps all over at connector
Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 6 months ago

You may just have a bad connection. i would recommend replace crankshaft sensor and see if it starts since 95% of no starts on this engine are the crank sensor problems.

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Customer reply replied 6 months ago
Okay I've ordered a pretty good sensor. It is a BWD sensor. Lifetime warranty! I'll try it but tonight and let you know if it works
Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 6 months ago

Okay. Thanks.

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Customer reply replied 6 months ago
My part finally came in put it on and it says same thing but now I checked cam shaft sensor. And the cam shaft synchronizer has broken the wheel. I do not understand why this would make it not fire
Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 6 months ago
The shorted sensor will cause system to not fire. You will need to replace entire assembly
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Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 6 months ago
The signal return in sensor will cause the no fire. Try to disconnect cam sensor to see if you get spark even though it will not be at correct time
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Customer reply replied 6 months ago
Okay I will try this I had to order the synchronizer and the sensor suppose to have it here at 630 tonight
Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 6 months ago

Okay.

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Customer reply replied 6 months ago
Okay so I have put it back together but where the sensor and the synchronizer was broke it's out of time.
Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 6 months ago

Here is direction for putting in a new one.

https://1drv.ms/b/s!ArGz65GfcqjYolFk2gzz98a3xZ6P

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Jeep Mechanic: Jaybird61, ASE Certified Master Technician replied 5 months ago

Let me know if you have any other questions for me?

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Jaybird61
Jaybird61
Jaybird61, ASE Certified Master Technician
Category: Jeep
Satisfied Customers: 2,302
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Experience: Automotive Instructor at Palm Beach State College

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