Not to dig up a month old thread, but mine just started with the P0101 code, drop off in boost to zero until restart. First time it happened was 3 weeks ago during the first cold snap here in MD (low 40's). Usually happens during a longer drive (highway) on colder days. Warmer days seems to be fine. Vehicle has had a K&N cone filter in the stock air box for a while with the GMTU.

I bought the car used back in March, K&N was previously installed.

So what I'm doing is to use Torque (Android App) with a bluetooth adapter for the OBDII system to monitor when it happens. I've done some checks (boost leak check and checked the intercooler for cracks, MAP sensor wiring checked), nothing found, so more than likely the MAF sensor is starting to get temperamental.

Going to log some data with Torque, then switch out the K&N for a stock paper filter (my wife's car) to see if it still happens. If it does, then I'll pick up a new MAF sensor from work.

 

I had the paper filter for 6 months after I bought the car...and no code...I start messing around with a custom intake, and have had problems since....

only thing I can tell you is what I have been told...get tuned for it.

I have the OEM replacement K&N filter and it gives me a code maybe once a week

 

I'm not 100% its the filter. I'm pretty sure its the MAF sensor. If it really was the K&N, this problem would have shown up months ago. I've only cleaned the filter since I've owned the vehicle as I said it was previously installed.

 

I would be interested to see your results....If you are correct, I'm going shopping for a new maf sensor

 

There is always a small chance that it could need a tune, but I have a feeling that it isn't. So we will find out in the next few days.

I'll update the situation as things progress.

 

When you cleaned the filter, did you re-oil it? I'm told that improper oil application may cause a problem.

 

Yes, I re-oiled it. The cleaning and re-oiling was done back in May or June. So I doubt it's that either.

 

Could be the accumulation over that period of time. I would buy some MAF cleaner and give it a try....cheaper than a replacemnet.....especially if it's just accumulation.

Oh, DO NOT use carb or parts cleaner.

 

A little update on my intermittent P0101 code/no boost problem.

So I decided to forgo swapping out the K&N for a paper filter and decided to just datalog with Torque.

Since my last post - almost a month ago - I have yet to have another P0101/No Boost problem rear it's ugly head.

I do have a paper filter and MAF cleaner sitting in the wings once this pops up again.

So right now, I've been banging my head against the wall wondering what caused this to show up in the first place. Temps have dropped just as cold as when it first happened a few times, but nothing.

Going to keep datalogging all my trips and hope this shows up at least once. Then I can put my game plan into action. First clean the MAF, then try the paper filter.

 

So here is another update on the ongoing saga of P0101 code that has been popping up randomly.

I still wasn't convinced it was the air filter. But I did recheck to make sure I didn't over-oil it - I didn't, but I cleaned the MAF sensor anyway. Ended up not helping at all.

I've noticed that the code popped up when it was very cold (temps around 30 degrees F), very cold and damp (temps around 30 degrees F, or cold and damp (Temps around 40 degrees F)

Really no rhyme or reason. I've been using Torque to datalog and record my travels in the car and also saving and reading the Freeze Frame Data when the code shows up. Since my last posting, the code popped up 2 times before Christmas. But during the week between Christmas and New Years, the code popped up 4 times. Finally getting somewhere.

After looking at all the Freeze Frame data, I had nothing that gave me any type of duplication of conditions - other then outside air temp. Everything else (speed, IAT, engine temp, etc) was different by a pretty considerable margin.

So last week I took off the K&N conical filter and installed a factory style Purolator filter. I have not had the code show up yet. But since I've installed it, temps have been in the mid 40's, only this morning on the way to work was the temps really cold.

So as of right now, looks like the stock type filter fixed the issue (I digress on being told so), but I'm still keeping track of my travels in the car using Torque just in case it shows up.

If I don't have the condition occur within the next 1-2 weeks, then I'll have to decide on whether or not it's worth it to get a tune at this time frame for just a K&N. Tune will definitely come once I start replacing the intercooler and charge pipes.