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3

I would surely pull the valve cover and scope down to the timing chain tensioner and the plastic runner that it presses against. You can see the top of the guide with a flashlight, but not the bottom with the chain on. Also look at the top guide that the chain slides over, it is held in place by two 10mm bolts if I recall correctly. If the plastic isn't on ...


2

The MAF supplies air flow and temperature data to the car's computer, a failing MAF sensor can definitely produce surging at idle which is what it sounds like you have. You might also get hesitation or jerky acceleration, and find it's hard to start. A dirty one can also cause the same issues, so it makes sense to try cleaning it before replacing. There's ...


2

Theoretically, temperature should not affect the operation of the MAF unless it gets very cold (like -40° C or F - take your pick). I'd suggest if you the MAF code keeps popping, even after cleaning, your MAF is most likely at fault. The only thing you might be able to do is to try a different MAF sensor and see if that fixes the issue. The problem with this ...


2

So far so good with the MAF cleaning, haven't had the codes pop up for about 850mi post cleaning and the MAF housing's interior and the laminar air screen were definitely dirty. I'm assuming the actual sensor itself was likewise dirtied up though I couldn't inspect any real dirt on its parts. I gave the part a good squirt down with CRC 05110 Mass Air Flow ...


1

As GdD says in his answer a failing MAF is the likely culprit here - and would be consistent with the codes you are getting from the ECU. So that is where I'd start. If a MAF clean/replacement doesn't resolve the symptoms then another potential cause (based on the symptoms you describe) would be the Electronic Throttle Module (ETM), these were problematic ...


1

You may have already fixed your problem You may need to clear the codes for the Check Engine Light to go away. It may be that the sensor is clean but the check engine light is being shown because it's retained in the computer's memory. Once the codes are cleared, see if the CEL stays off or if it returns. If the issue returns P0171 is saying that the ...


1

When you reset the lights, it takes a few miles (and certain conditions) for it to get back to a ready state. When it gets there, if it isn't fixed, the lights will pop again. I'm wondering if you have a leak in your intake tract somewhere. Seems you were thinking that way when you replaced the intake gaskets. I'd look at the intake tube between your MAF and ...


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