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Old 08-23-2009, 06:34 PM   #1
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Exclamation P0101 Mass airflow circuit - Performance Problems.

I have a 01 Viggen, I was on my way to a basketball game stopped to fill up on gas, got on the highway and the check engine light came on. I scanned it with tech 2 and the following code came up: P0101 Mass Airflor Circuit - Performance Problem, I did a bit of reading and most people suggested to cleaning the air filter, I cleaned the filter and reoiled it, everything seemed fine for a few weeks, until hoses started to randomly pop off from (I'm not sure what it is called but it's located on the top right side of the engine bay, it's a black box that has hoses comming to it from the throttle body, bypass valve, and somewhere else. So i put those back on with zip ties and everything seemed fine. Now last night as i leave work, a new sound appears similar to as if I had an external wastegate!? The car is basically dead in 3rd gear and if i go any further than half throttle it starts misfiring like crazy. Any ideas? I'm guessing new MAF, maybe Spark Plugs, and whatever the black box is. Btw, car has 170,000 miles, ETS intercooler, cobra pipe along with a td04 with 20k on it, 3in dp, intake, straight pipe. I had it dynoed before this crap started happening and it was running "too lean" according to the owner, the A/F was around 15/16, it put down 246.2 whp and 294.7 torque, tune time?

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Old 08-23-2009, 07:25 PM   #2
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you probably need a new MAF sensor. I'd also suggest silicone vacuum lines, found at genuinesaab.com. you need about 12 feet for everything. Pull you spark plugs and see what they look like. also try resetting your ecu by unhooking the negative terminal on the battery for about 10 minutes
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Old 08-23-2009, 08:15 PM   #3
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Well MAFs should be replaced at 60K so your car should be on its 3 MAF. So yes get a new MAF. Second I would recommend checking your Bypass valve.
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