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Old 12-29-2014, 09:32 AM   #1
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Rev flat spot after MAF cleaning

Hi Everyone,

Hope you all had a great holiday season. Trying to track down an issue and yes I did search for an answer...

Got the P1198 on a 2001 S, so I replaced the upstream O2 Sensor and cleaned the MAF. I had the fault cleared.

So when driving it, it seems to be a bit sluggish up to about 4500 RPM, then there is a surge up past 5K. From there is rev's fine. I am wondering if maybe the MAF is going (or is) bad.

Any ideas? Also is there more than one MAF part number for the 2001 S?
Thanks in advance.

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Current Porsches: 2002 Boxster S (Speed yellow)
Past Porsches: 1972 914, 1987 944S, 1976 930, 1986 951, 1999 986, 1992 968, 2001 986 S, 2006 Cayman S, 1986 951 track car, 2001 986 S, 2005 Cayenne
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Old 12-29-2014, 11:09 AM   #2
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Drove the car for a bit. The flat spot is a 3700-3800 RPM and is really only felt under hard throttle. Under low to mid throttle, it is not noticeable. You know, it could have been there all along and I just never noticed it....
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Current Porsches: 2002 Boxster S (Speed yellow)
Past Porsches: 1972 914, 1987 944S, 1976 930, 1986 951, 1999 986, 1992 968, 2001 986 S, 2006 Cayman S, 1986 951 track car, 2001 986 S, 2005 Cayenne
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Old 12-29-2014, 04:36 PM   #3
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Actually, I had a really noticeable flat spot under hard throttle this summer when I was trouble shooting my MAF issues. This is how I fixed it:

Every time I was working on the car and then driving it, I got a flat spot at 4500 rpms. To get rid of it, let the car completely cool off, say overnight. Next morning, disconnect the battery for a couple mins. Reconnect battery. Turn the key on but don't start it (don't touch the pedals) for a minute. Turn the car off. Start the car and let it idle for 5 mins. You should be good to go from there.

Sounds silly, but if I didn't do that - that flat spot would hit hard, esp. ripping down the autobahn.
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Old 12-29-2014, 05:01 PM   #4
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Thanks, I'll give it a try.

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Current Porsches: 2002 Boxster S (Speed yellow)
Past Porsches: 1972 914, 1987 944S, 1976 930, 1986 951, 1999 986, 1992 968, 2001 986 S, 2006 Cayman S, 1986 951 track car, 2001 986 S, 2005 Cayenne
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