Mechanics

CUTS OUT WHEN AC IS ON GOT A MISFIRE CODE

2003 Ford Focus • 65,000 miles

I have posted this problem a number of times. If I have a misfire in cylinder 2. This is coil on plugs. Can I pull the wire on number 2 you know like you use to be able to do when a cylinder was cutting out pull a spark plug wire to see what cylinder is was. And I would like to know is how you test the injectors to see if it is bad?
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Randy sharp
May 18, 2013.



Yes but first I would remove all the plugs and do a compression test. It is common for the valve seats to fail in these units causing the miss.

Check all plugs for wear as well. The fuel rail needs to be removed to watch the spray pattern of the injectors.

Roy

ASEMaster6371
May 18, 2013.
This focus only has 66,000 on it I am not saying it couldn't happen. What kind of spray pattern should they have

Tiny
Randy sharp
May 18, 2013.
A nice coneical pattern there will be one missing or way off if it is the issue

i have seen them at 50k with the valve seat issue

Roy

ASEMaster6371
May 18, 2013.
I sure appreciate the advise, but why do you think it only does it when the AC is on?

Tiny
Randy sharp
May 18, 2013.