Have been getting P0301 in
06 Cayman S
intermittently for some time. Tried running Techron for a while, didn't seem to do much help. So, mechanic replaced all coils and sparkplugs, car being older anyways. But, engine light came back, same code, P0301. Car is completely stock, about 135k miles, parked in a garage, driven in California with no rain/inclement weather. Car idles a bit rough when cold, seems fine when warmed up. Occasionally catch the CEL blinking on cold idle. Have done lots of searching, lots of people suggest swapping coils/plugs, but all have been changed. Some say could be air oil separator? Other thoughts?
Clean the mass air flow sensor, using oil-free MAF sensor cleaner., and check for oil film/puddling in the intake ducting . Clean the throttle body and intake runners as required. Check/replace the air oil separator.
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You're welcome. That was quite the delayed response! Did you finally get a round tuit?
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Heading to harbor freight today to grab temperproof torx bits and trim removal tools. Fingers crossed on just cleaning the maf...
Good luck!
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There is a FIVE point security torx (not 6) securing the maf to the car. Is that factory??
You could simply remove the housing containing the MAF sensor, and clean it on the bench. You should also remove the tee duct containing the throttle body, and the flex hose between the MAF sensor and the TB. There's likely oil inside the intake manifolds downstream of the tee duct. Use clean shop rags, and your choice of solvent, to remove any traces of oil from the engine air intake ducting. Remember to use only oil-free solvent on the MAF sensor.
It's a messy, time-consuming process, but it needs to be done as thoroughly as possible to preclude fouling the MAF sensor again. You should check the AOS function using a vacuum gauge on the oil fill cap with the engine idling (IDK the acceptable value, so I'll leave it to you to do a search). Carefully reinstall everything (b/c you don't want to introduce a vacuum leak) and you should be good to go.
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Good ideas! Thank you. Much appreciated
Not necessarily. But I'd just replace it anyway. Also, I suggest keeping the oil level no higher than 1 bar below the full marking (or two bars below the top of the bar gauge), to reduce the likelihood of oil ingestion, foaming, etc.
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Swapped the AOS. That clamp on the bottom took me a solid 90 minutes to get on and off. There was a tad of oil in the air tube from the AO. Didn't have enough time to clean everything after, but shot the MAF down with cleaner (though it already appeared clean as a whistle). Cold idle is smoooooth now.
Thanks for your help
@Croc'ed
You're welcome. I'm glad your car is running properly again.
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Update for whoever comes across this thread in the future:
Did all the above (replacing aos and cleaning maf) on a short time schedule hoping the CEL would not come back. Well, it did. Taking the t duct off and Cleaning out inside alllll the intake ducting with some towels and simple green seems to have done the trick. There was some oil, small amounts, kicking around in there. Cold idle also much smoother now.
Thanks again croc'ed!!
Hello Sandiegan,
I’m struggling a lot with the same issue:
The P0301 code comes back regularly (every 20-50km in the city, 50-300km on the highway) and has been persisting for about 1.5 years. Sometimes it appears along with the P0421 code.
Here is what has been done by the dealership:
• AOS changed (because of smoke at startup, not the code. No smoke anymore at startup)
• All plugs and coils replaced
• Inside catalytic converter inspected during clutch change: clean
The dealership has test-driven the car few times and told me nothing seems wrong. However, the P0301 code is still coming back.
Did you definitively fix that with what you described in your last message?
Thanks
