12-29-2014, 10:32 AM
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#1
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Registered User
Join Date: Mar 2009
Location: DFW, TX
Posts: 206
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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.
__________________
rob76turbo
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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12-29-2014, 12:09 PM
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#2
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Registered User
Join Date: Mar 2009
Location: DFW, TX
Posts: 206
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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.... 
__________________
rob76turbo
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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12-29-2014, 05:36 PM
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#3
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Registered User
Join Date: May 2011
Location: Johnstown, PA
Posts: 195
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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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12-29-2014, 06:01 PM
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#4
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Registered User
Join Date: Mar 2009
Location: DFW, TX
Posts: 206
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Thanks, I'll give it a try.
__________________
rob76turbo
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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