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My 2009 mercury mariner 6 cylinder check engine light is ...


My 2009 mercury mariner 6 cylinder check engine light is on and my scan tool says cylinder 2 misfire. It will drive fine for about 20 min. The it will loose power and shudder Mechanic's Assistant: Does the light stay on, o...

My 2009 mercury mariner 6 cylinder check engine light is on and my scan tool says cylinder 2 misfire. It will drive fine for about 20 min. The it will loose power and shudder Mechanic's Assistant: Does the light stay on, or does it blink? It stays on then after driving for 20 min or 30 it blinks Mechanic's Assistant: What is the model of your '09 Mercury? Mariner Mechanic's Assistant: Are you fixing your Mariner yourself? What have you tried so far? Just put fuel isystem cleaner and got a scan tool but that's it Mechanic's Assistant: Anything else you want the Mechanic to know before I connect you? The oil light comes on now and again. But has plenty of oil. Now but it was 2 qts low 4 days ago

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Responses

Automotive Expert
Hello! Welcome to JustAnswer. Thank you for contacting us for assistance with your Mariner. My name is \*\*\*\*\* \*\*\*\*\* I'll be helping you today. I'm so sorry you are having this issue with your Mariner, I know it can be frustrating. Is your Mariner equipped with the coil on plug ignition or a coil pack?

Coil on plug
Automotive Expert
Ok, the first step then would be swapping the cylinder 2 coil with a different one and seeing if the misfire moves to whatever cylinder you put the cylinder 2 coil on. If the misfire moves, you've got a bad coil.

Is the cylinder 2 on backside of the engine
Automotive Expert
Unfortunately yes, its the middle cylinder on the back bank.

Can't afford to have a phone call gotta save it for my vehicleWhy will it run fine for a bit then start running like shitWhat tools can I get by with doing what you suggested
Automotive Expert
That is totally fine, it's just an automated thing anyway. Well heat changes resistance in electrical components, so it could be that once it gets warm it can't operate as well any longer. You really should only need a basic socket set to remove the intake manifold, but you will want to get new gaskets for when it is fixed to make sure there are no leaks.

you want me to check that out first? How cheap can I get what tools I'll needCan I request you after I try this out
Automotive Expert
That is almost always the cause of misfires, and everything else you would check would be more difficult and still require you to remove the intake to get access to that cylinder. You can probably get a set from harbor freight or wal mart for under $50 that will be fine. Yes you can.
Automotive Expert
You could also just roll the dice and replace that coil so you don't have to take everything apart again. If you're going to be back there putting new spark plugs in would be a good idea as well.

Andrew sounds very confident and nice. He knows what he is doing. What he told me to check is what I have seen on internet. Now I'm confident what to try
Automotive Expert
Thank you! Best of luck, and please don't hesitate to contact me again with more questions.

Thanks
Automotive Expert
Anytime.

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