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Dan, Technician
Category: Ford
Satisfied Customers: 23941
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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2001 Ford Escape: cylinder..misfire..Changed plugs, coil

Customer Question

2001 Ford Escape 3.0 getting cylinder 3 misfire. Changed plugs, coil, and upper intake gaskets. Only happens when wet or snowing when cold first thing. Then warms up and runs perfect!
Submitted: 7 years ago.
Category: Ford
Expert:  Tim West replied 7 years ago.
Thanks for visiting
Check the Orange/Yellow wire between the coil and pin 78 of the Powertrain Control Module (PCM) for high resistance or a short to ground. Repair the wire as needed and retest.

2. If the wire is OK, try swapping the coil from cylinder 3 to one of the front cylinders and redo the Key On Engine Running (KOER) test.

3. If the code changes to the cylinder where the coil was moved to, replace the coil. If the code is the same, run a new wire from the PCM to the coil in case it is breaking down under a load.

4. If the wire is not a problem and the coil has been ruled out, perform a compression check and running compression test to determine if a mechanical concern exists. If a mechanical condition is not the cause, replace the PCM. NOTE: If the PCM is replaced, it will need to be configured.

5. If a mechanical concern does exist, dis-assemble and repair as needed and retest for proper operation.
Customer: replied 7 years ago.
Already changed coil from 6 to 3 and same thing. I do not accept this answer
Expert:  Tim West replied 7 years ago.
Okay, I will opt out so another expert can help.
Customer: replied 7 years ago.
thank you
Expert:  Dan replied 7 years ago.
Hello from what you are describing it could be a few problems such as wiring to injector or coil. You can use a led voltmeter to verify you have good power/ground at the injectors and coil when problem is happening if you dont repair whatever wire isnt showing correctly and if it is good then the problem is either a worn valve or lower intake gasket. It figure out which one you will need to do a cylinder leak down test when vehicle is cold. To do this you need to take regulated air and inject it into #3 cylinder with the cylinder top dead center on compression stroke so all the valve are closed. If you hear air in the intake then its a intake valve or if you hear it out the exhaust you have an exhaust valve. If it holds air like its doing you can try as tim said and do a running compression test with vehicle started to verify compression is the same on the cylinder when cold as the other. If compression is good replace the lower intake gasket. Let me know if you have questions, thanks.