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Old 11-02-2019, 09:49 AM   #1
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Mice in airbox; motor dead?

2014 Focus SE with a 2.0



Last week, wife said car was a little hesitant at a stop light. Ran just fine afterwards. Sat parked for another six days or so. She started it in the driveway, it'd get to 1100 RPM then die. Flagged a bunch of engine codes. Popped the hood, mouse went scurrying off. Open airbox and found above picture.

Pulled throttle body tube; FULL of seeds. Pulled throttle body, seeds inside intake manifold. Shop-Vac'd them out. New filter, cleaned all airbox hoses, more and more seeds/fibers. All loaded up.

Started car, idled fine, drove a mile down the road, car was hesitant, 1100 RPM, then dead. Tried restarting, killed the battery in the process. Walked home to get truck and trailer. Finally got it home.

So far I've got the following codes:

P2227
P2195

Not sure if the MAF sensor is pooched. Looks like an issue with the 02? The Barometric Sensor seems like its giving me issues as well.

I'm wondering if the mouse urine wrecked all the sensors in the intake pipe. That thing was full of, literally, crap. My worst fear is the intake sucked in material and I have a valve stuck somewhere.

My last resort is dropping it off at a dealer. I've never done that. I fix everything that I own. I just don't have the time to tear the motor apart anymore. Does this sound like a sensor issue?

Any other suggestions? Thanks.


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Old 11-02-2019, 11:13 AM   #2
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Your sensors in the intake system are probably trashed. At the very least clear the codes out use some mass air flow sensor cleaner and try to clean it and visually inspect it, but they may have chewed it up.
The only way to know if you have engine damage would be to do a compression test.

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Old 11-02-2019, 11:33 AM   #3
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Originally Posted by zacautomotive View Post
Your sensors in the intake system are probably trashed. At the very least clear the codes out use some mass air flow sensor cleaner and try to clean it and visually inspect it, but they may have chewed it up.
The only way to know if you have engine damage would be to do a compression test.

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Yea, I'm going to dig back into it later today. I also watched a video on the MAP sensor as well. Going to yank that out and see what that looks like.
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Old 11-02-2019, 04:27 PM   #4
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Pulled the MAF. I can see chew marks on it. Pulled the throttle body off and saw even more seeds in there. Took some doing, but it looks like I got them all out. I cannot for the life of me find the MAP sensor. I'm being told there may not even be one?

Going to order a new MAF, put it together, and see what happens. If I still have issues, trailer it to a dealer and just get bent over I guess.
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Old 11-02-2019, 06:02 PM   #5
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Originally Posted by Bang Smash View Post
Pulled the MAF. I can see chew marks on it. Pulled the throttle body off and saw even more seeds in there. Took some doing, but it looks like I got them all out. I cannot for the life of me find the MAP sensor. I'm being told there may not even be one?

Going to order a new MAF, put it together, and see what happens. If I still have issues, trailer it to a dealer and just get bent over I guess.
In addition to looking for damage to the actual sensors I would look closely for damage to the wiring in all harnesses in the vicinity. Rodents love the soy based wire insulation.

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Old 11-06-2019, 04:11 PM   #6
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So far sound advice. MAP & MAF are basically old and new terms. Try disconnecting the MAF. If it runs ok without it that is your problem.
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Old 11-06-2019, 04:15 PM   #7
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I ignorantly ran my 2005 with. No filter for like 30k but it runs like a champ at 160k. I'd bet against the seeds and whatever being an engine killer. Just give it some love on the freeway and burn all the shit out of the system aka CAT
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Old 11-08-2019, 04:22 AM   #8
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I sincerely hope you STOMPED that damn mouse. LOL
Seriously though, good luck, I hope the damage isn't too bad.
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