No spark to spark plugs?

Tiny
KEN SOWELL
  • MEMBER
  • 2006 FORD ESCAPE
  • 2.3L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 106,000 MILES
Replaced intake valves, timing chain set, top end gaskets and one bad coil. Fired up and cylinder's two and three are out, power at coil but no spark. Replaced coils but no spark switched coils with number one cylinder still no spark. Runs on cylinder's one and four, but no spark at cylinder's two and three. Twelve volts at cylinder's two and three oils but no spark.
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Sunday, May 27th, 2018 AT 9:59 PM

18 Replies

Tiny
STEVE W.
  • EXPERT
Only a few things that will cause that. Bad coils, bad wiring harness between the coils and the PCM or a bad PCM. Your testing shows that it is not the coils. The next thing to do would be to check for the control signal from the PCM. If you look at the wiring there are only the two wires per coil. Power is a common feed to all four on the red wire. The other wire is the trigger wire to the PCM. An easy way to test is to use a NOID light, just plug it into the connector and see if it flashes when you crank the engine.
Another way is to use a simple test light and connect one side to battery possitive and touch the trigger wire for the coil and see if it flashes when the engine cranks.

I would start testing right at the PCM itself. Disconnect the battery and remove the connector that goes to the coils. Check it for corrosion and connection. Reinstall it.
Next check the ground connection to the PCM battery and block.
Now connect the battery back up, connect the test light to battery positive and go to the connection on the PCM where the coil wires connect. Either use a T-Pin or thin wire probe to back probe the wires or just use a needle to punch a hole through the insulation close to the connector. (Use liquid electrical tape to seal it when you are done) Have someone crank the engine and see if you get a flashing light on each wire. If you do there is a break in the wires to the coils, if you do not then the PCM is bad as it is the only ignition controller on that engine.
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Monday, May 28th, 2018 AT 8:11 PM
Tiny
KEN SOWELL
  • MEMBER
Thanks Steve.
Great information you were spot on just a little too late. I pulled the ECU opened it and found coil drivers were fried. Looking for someone to repair the circuit.
Will be back. Good bye.
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Monday, May 28th, 2018 AT 9:22 PM
Tiny
STEVE W.
  • EXPERT
There are places that repair them, but many times you can just pull one from a scrapyard for less and use it for parts. It is also likely that the drivers could be "improved" if you can find the actual part they used and find one that can handle more current than the stock parts.
Either way it's a good thing you found the issue. Most folks do not go to component level repair because the OEM's hide the part numbers really well.
Good luck with the repair, if you find the parts/numbers please post back, it would be a great addition to the site for others.

Thank you for using 2CarPros. Com. Please return anytime with your automotive questions.
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Tuesday, May 29th, 2018 AT 8:08 AM
Tiny
KEVINMPD02
  • MEMBER
  • 2004 FORD ESCAPE
  • 3.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 239,000 MILES
I have a 04 escape 3.0 there is no spark to the coils at all, I have replaced the cam and crank sensors and still no spark. Not sure where to go next or what my next step should be. Thanks
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Thursday, November 26th, 2020 AT 12:11 PM (Merged)
Tiny
WRENCHER1
  • MEMBER
Check that the coil is receiving power first but I have had a couple bad computers on the 3.0 Escapes with spark lost but usually only to one cylinder.
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Thursday, November 26th, 2020 AT 12:11 PM (Merged)
Tiny
KEVINMPD02
  • MEMBER
Ok how do I check to see if it's getting power
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Thursday, November 26th, 2020 AT 12:11 PM (Merged)
Tiny
WRENCHER1
  • MEMBER
With a voltmeter or a test light at the coil.
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Thursday, November 26th, 2020 AT 12:11 PM (Merged)
Tiny
KEVINMPD02
  • MEMBER
Ok thanks I'll check it out in the morning.
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Thursday, November 26th, 2020 AT 12:11 PM (Merged)
Tiny
KEVINMPD02
  • MEMBER
The wires coming to the coils dose not have power.
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Thursday, November 26th, 2020 AT 12:11 PM (Merged)
Tiny
WRENCHER1
  • MEMBER
The power to the coils is supplied by the system main relay, called the PCM power relay. Check the fuses that power this relay in the diagram.

http://i1198.photobucket.com/albums/aa448/Wrenchtech/107198225.jpg.gif

https://www.2carpros.com/images/external/107169986.jpg.gif
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Thursday, November 26th, 2020 AT 12:11 PM (Merged)
Tiny
KEVINMPD02
  • MEMBER
Ok checked all fuses and are all good
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Thursday, November 26th, 2020 AT 12:11 PM (Merged)
Tiny
WRENCHER1
  • MEMBER
I gave you the wiring diagram. You are going to have to troubleshoot the circuit using that t determine where the power is being lost.

The lead coming off that relay marked "A" goes to the coils.

https://www.2carpros.com/images/external/107198226.jpg.gif
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Thursday, November 26th, 2020 AT 12:11 PM (Merged)
Tiny
ARICJOLLY
  • MEMBER
  • 2004 FORD ESCAPE
  • 144,000 MILES
Already checked fuses and relays. Changed crank and cam sensors.
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Thursday, November 26th, 2020 AT 12:11 PM (Merged)
Tiny
KEVINMPD02
  • MEMBER
Ok thanks
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Thursday, November 26th, 2020 AT 12:11 PM (Merged)
Tiny
KASEKENNY1
  • EXPERT
Which engine do you have? This is going to make a difference in potential issue. If you are not getting anything we need to check the PCM operation as it is more then likely powering them. So that could be due to a theft issue so can you ensure the theft light is not on?

Also, we need to check for codes if you have not done so.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Thanks
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Thursday, November 26th, 2020 AT 12:11 PM (Merged)
Tiny
ANTHONY BESHIRES
  • MEMBER
When replacing the cam and crank sensor, be careful not to rotate the connector before plugging connector onto sensor. The wiring has a tendency to be short and stiff due to age. Twisting the connector can result in the harness connector twisting the 2 wires together in the end of the connector and short out the sensor output signal. Resulting in the engine to not fire at all.I had this problem on the crank sensor
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Thursday, November 26th, 2020 AT 12:11 PM (Merged)
Tiny
AL514
  • EXPERT
I already had this pulled up for him. But yeah we do need to know if it's a Duratec or not. A 2.3L or 3.0?
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Thursday, November 26th, 2020 AT 12:11 PM (Merged)
Tiny
KEN
  • ADMIN
Excellent addition to this thread! Please feel free to help out whenever you are on the site :)
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Thursday, November 26th, 2020 AT 12:11 PM (Merged)

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