03-13-2013, 07:58 AM
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#8 (permalink)
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A True Z Fanatic
Join Date: Jun 2010
Location: Long Island
Posts: 5,059
Drives: slowwww
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Quote:
Originally Posted by Jordo!
You almost definitely have a vacuum leak somewhere after the MAF sensors or somewhere before (or just past) the primary O2 sensors.
It's causing the car to run lean, and leads to a lean miss (and probably high positive fuel trims).
You can try spraying carb cleaner around the intake area and near the TB's while the car is running to see if the idle changes -- when it does, you are closing in on the leaky spot. Failing that, you'll have to get it on a lift and check for evidence of leaks around the primary O2's. That will be trickier to pinpoint (might see black exhaust residue), so hopefully the leak is before the headers.
Good luck.
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I checked the intake. Nothing out of the ordinary. I didn't even get a chance to install the Gen 3's yet so it's currently the stock intake setup. If the code comes back, I'll make sure to check around the 02 sensors. I can't imagine an exhaust leak after the cats could trigger it, can it? Also, the misfire is random, so it could also be something in the fuel or fuel system or the battery. The car is close to 4 years (around 39k miles) with the original battery. It still starts fine, even with the cold weather.
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