2004 Mazda Tribute V6 misfire.

10

Asked by Vinpetie Nov 19, 2016 at 12:38 AM about the 2004 Mazda Tribute LX V6 4WD

Question type: Maintenance & Repair

Hi all.

I have a 2004 V6 Mazda Tribute that has no spark to number 4 cylinder. It is not
a spark plug or coil issue as I can swap the plugs and coils around and get
spark on other cylinders ok, just not number 4. I have replaced the PCM and still
no better and tested the wiring back to the PCM. I am getting 12 volts to the coil
on the positive wire and continuity ok on the negitive back to the pcm
connector.
I have compared the voltage and resistance to a known good coil connector
and the only difference I'm seeing is that on the negetive wire is that it's not
opening and closing the curcuit (switching from 0 ohms to open circuit) like it
seems to be doing on the other coils while the engine is running. This reading
made me think that the PCM was faulty. But obviously not.
Has anyone had this issue before or can offer any ideas of where to look to
next?

1 Answer
10

Vinpetie answered 8 years ago

Hi all. I was able to nut it out myself. I found the earth pin in the multipin connector to the PCM to be open circuit. It was tricky to find as testing it with an ohm meter probe into the connector itself and the earth connection to the coil pack tested fine. It wasn't until I opened up the PCM and tested the corresponding solder connection on the PCB to the coil connector it showed open cicuit. I decided to replace the main engine harness ($50 from a wrecker and 3 hours later in my garage) and the engine ran like new again. Just thought this might help someone out as this issue was a bugger to find. The misfire was intermittent at first until the connection eventually let go.

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