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It will start but no spark at no 4 or 8 cylinder it has the…

Customer Question
Hi it will start...

Hi it will start but no spark at no 4 or 8 cylinder it has the same voltage at the coil plug as no 2 no 2 no problem using the same coil no spark at 8

Mechanic's Assistant: Will the headlights turn on? Is the battery fully charged?

Yes it starts and runs no problem charging around 14.8 volts

Mechanic's Assistant: What is the model of your '14 Dodge?

4.7 2002 2wd 1500

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

Yes i am in scotland so no one else i am a motorcycle mechanic

Submitted: 10 months ago.Category: Dodge
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Answered in 2 minutes by:
10/6/2017
Dodge Mechanic: Dan, Technician replied 10 months ago
Dan
Dan, Technician
Category: Dodge
Satisfied Customers: 26,035
Experience: 2 Year Auto Diploma and Database Access
Verified

Hello, my name is ***** ***** I'm here to help get your problem solved.

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Dodge Mechanic: Dan, Technician replied 10 months ago

The coils all get battery power then they are activated when the ECM grounds the control wire. So this would either mean wiring problem or ECM (Engine Control Module) which is the main engine computer has failed. So since you know power is good next step is testing the control wire. The blue/red wire on coil 8 goes from coil to pin 9 of connector 1 at ECM. Unplug ecm and check resistance between two points, if resistance is under 5 ohms then ECM needs to be replaced. Let me know if you have questions or if there is anything else I can do to help, thanks.

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Customer reply replied 10 months ago
Hello Dan
my name is Ian
Dodge Mechanic: Dan, Technician replied 10 months ago

Hello Ian, here is answer again in case you missed my previous reply.

The coils all get battery power then they are activated when the ECM grounds the control wire. So this would either mean wiring problem or ECM (Engine Control Module) which is the main engine computer has failed. So since you know power is good next step is testing the control wire. The blue/red wire on coil 8 goes from coil to pin 9 of connector 1 at ECM. Unplug ecm and check resistance between two points, if resistance is under 5 ohms then ECM needs to be replaced. Let me know if you have questions or if there is anything else I can do to help, thanks.

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Customer reply replied 10 months ago
the pcm is new
Dodge Mechanic: Dan, Technician replied 10 months ago

Did you have exact same problem before replacing? Did you test control wires?

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Customer reply replied 10 months ago
if i put a volt meter over the coil connections the same voltage is showing at all coil connections do you mean between the coil and the ecu
Customer reply replied 10 months ago
ecm
Dodge Mechanic: Dan, Technician replied 10 months ago

That is correct, between the coil and ECM.

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Customer reply replied 10 months ago
the resistance is 9.7 ohms
Dodge Mechanic: Dan, Technician replied 10 months ago

That is too high, it should be under 5 ohms. Verify one of the working cylinders have lower resistance if so clean connectors to see if that helps if not run new wires. Let me know how it goes, thanks.

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Customer reply replied 10 months ago
i don't know if it was the same i bought it as a non runner
the cylinder heads have been changed for new ones one was cracked
Dodge Mechanic: Dan, Technician replied 10 months ago

Compare resistance on control wire between cylinder 8 and cylinder 7, if cylinder 8 has higher resistance then clean connectors and run new wire. Let me know if you have questions, thanks.

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Customer reply replied 10 months ago
they are are the same it is sparking on no 7 using the same coil
Dodge Mechanic: Dan, Technician replied 10 months ago

You need to check resistance of control wire between coil 7 and ECM then compare reading to coil and ECM. If resistance is 9.7 ohms that is too high so you will need to run new wires between coils 8/4 and ECM if connectors are in good condition.

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Customer reply replied 10 months ago
ok will check all the wiring resistance and get back to you thanks it is all little to dark outside now will do it in morning and let you know.
thanks for the help Ian
Customer reply replied 10 months ago
have cleaned up the connectors the ohmns now reads 1.6 still no spark
Dodge Mechanic: Dan, Technician replied 10 months ago

Has anything else been replaced such as crank sensor?

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Customer reply replied 10 months ago
no but the cams have been off when the heads were replaced the sensor was changed over to new head
Dodge Mechanic: Dan, Technician replied 10 months ago

I'll open question up to see if someone else has some ideas, only other thing I'd think of is replacing crank sensor.

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Dodge Mechanic: -Brad-, Dodge Dealership Tech replied 10 months ago
-Brad-
-Brad-, Dodge Dealership Tech
Category: Dodge
Satisfied Customers: 8,325
Experience: 16 Yrs Chrysler/Dodge Technician. ASE Master Certified(L-1)
Verified

Good afternoon and welcome to JustAnswer!!

My name is ***** ***** I have worked for a Chrysler-Dodge-Jeep dealership for 19 years and I will do my best to help.

Can I get your VIN number and also what codes are setting?

Talk soon,

Brad

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Customer reply replied 10 months ago
hello Brad
There are no codes and no engine light the vin307HA18N12G122554
Dodge Mechanic: -Brad-, Dodge Dealership Tech replied 10 months ago

What is the compression of the dead cylinders?

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Customer reply replied 10 months ago
there is no spark compression is fine there
Dodge Mechanic: -Brad-, Dodge Dealership Tech replied 10 months ago

The 4.7 has a tone wheel on the passenger side camshaft, I see that you said the head was replaced.. Did you use the same tone wheel?

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Customer reply replied 10 months ago
Hi Dan
I don't know it was not me that changed them but i had the same thought i also told you the wrong cylinder no it is no 7 and 8 that has no spark so i will remove the rocker cover tomorrow can you give me any details on the tone for me to check
Dodge Mechanic: -Brad-, Dodge Dealership Tech replied 10 months ago
I would contact who replace the head and see if the same tone wheel was used.Thanks,
Brad
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Customer reply replied 10 months ago
tone wheel replaced but now gone to scrap can you tell me on the tone wheel for a 16 tooth jtec motor the cut outs or holes are from the v8 stamp are i have clock wise 11312213 can you tell me if this is correct
Customer reply replied 10 months ago
old one gone to scrap
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