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Xabiitxu
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996 O2 sensor issue
Xabiitxu replied to mbletsas's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)
Some further info. RPM vs MAF signal graph: Doesn't it look weird at the 6,000 rpm mark? VAriocam, MAF or something else? Thanks for your help -
996 O2 sensor issue
Xabiitxu replied to mbletsas's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)
My apologies to recover this old thread, I'm just lost and desperate for some help. I'm facing aparently a similar issue, but not sure it's the MAF. I was to reflash my 996 C2 (MY2000) and first found max power was at 277 hp instead of the expected over 300 (bypass, gt3 throttle body, ipd plenum, bmc air filter...). Then the guy checking the numbers found too lean mix at higher rpm which I did not expect as car was running perfect IMO, no fault codes nor dashboard lights. Anyhow we postponed the reflash till the lean issue was solved. See the dyno bellow: SInce this test last week I've clean the MAF, checked for leakages and read a LOT of posts about it but still could not get a clear idea. Since I have a durametric cable I did a couple tests on 3rd gear WOT a recorded the following parameters: 1-RPM 2-Mass air flow (MAF) 3-Adaption, range 2 (FRA), bank 1 4-Adaption, range 1 (RKAT), bank 1 5-O2 sensor voltage ahead of cat. conv., bank 1 6-Adaption, range 2 (FRA), bank 2 7-Adaption, range 1 (RKAT), bank 2 8-O2 sensor voltage ahead of cat. conv., bank 2 1 2 3 4 5 6 7 8 1.681 160 1,02 -0,19 0,84 1 -0,52 0,87 1.928 188 1,02 -0,19 0,88 1 -0,52 0,88 2.176 221 1,02 -0,19 0,86 1 -0,52 0,87 2.418 237 1,02 -0,19 0,88 1 -0,52 0,88 2.673 244 1 -0,19 0,88 1 -0,52 0,89 2.921 295 1 -0,19 0,88 1 -0,52 0,87 3.156 323 1 -0,19 0,87 1 -0,52 0,86 3.400 342 1 -0,19 0,88 1 -0,52 0,88 3.679 390 1 -0,19 0,87 1 -0,52 0,87 3.985 437 1 -0,19 0,87 1 -0,52 0,88 4.253 468 1 -0,19 0,87 1 -0,52 0,87 4.539 516 1 -0,19 0,87 1 -0,52 0,86 4.816 561 1 -0,19 0,86 1 -0,52 0,86 5.104 589 1 -0,19 0,85 1 -0,52 0,85 5.424 624 1 -0,19 0,84 1 -0,52 0,84 5.697 667 1 -0,19 0,84 1 -0,52 0,83 5.988 695 1 -0,19 0,83 1 -0,52 0,83 6.286 680 1 -0,19 0,81 1 -0,52 0,81 6.565 704 1 -0,19 0,81 1 -0,52 0,76 6.857 764 1 -0,19 0,83 1 -0,52 0,82 7.056 784 1 -0,19 0,85 1 -0,52 0,83 7.306 643 1 -0,19 0,84 1 -0,52 0,81 Any clues? Thanks in advance -
I wanted to flash my 996 C2 (MY2000, eGas), once I had finished some small upgrades (Bypass, gt3 throttle body, IPD plenum & BMC air filter) and was suggested not to. The attached dyno chart, showed ~25 hp were missing and second half of the chart has little less torque than expected. It didn't look a big deal to me: Anyway the tuner found too lean mixture at the higher end (above 6000 rpm) so he recommended me to find out the reason before going any further. Since he is not a Porsche specialist he could not help much and thought about a weak fuel pump... Anyway I'm not that sure about it. As I have a durametric cable I've done a couple logs and here is what I got on a 3th gear WOT launch: 1-RPM 2-Mass air flow (MAF) 3-Adaption, range 2 (FRA), bank 1 4-Adaption, range 1 (RKAT), bank 1 5-O2 sensor voltage ahead of cat. conv., bank 1 6-Adaption, range 2 (FRA), bank 2 7-Adaption, range 1 (RKAT), bank 2 8-O2 sensor voltage ahead of cat. conv., bank 2 1 2 3 4 5 6 7 8 1.681 160 1,02 -0,19 0,84 1 -0,52 0,87 1.928 188 1,02 -0,19 0,88 1 -0,52 0,88 2.176 221 1,02 -0,19 0,86 1 -0,52 0,87 2.418 237 1,02 -0,19 0,88 1 -0,52 0,88 2.673 244 1 -0,19 0,88 1 -0,52 0,89 2.921 295 1 -0,19 0,88 1 -0,52 0,87 3.156 323 1 -0,19 0,87 1 -0,52 0,86 3.400 342 1 -0,19 0,88 1 -0,52 0,88 3.679 390 1 -0,19 0,87 1 -0,52 0,87 3.985 437 1 -0,19 0,87 1 -0,52 0,88 4.253 468 1 -0,19 0,87 1 -0,52 0,87 4.539 516 1 -0,19 0,87 1 -0,52 0,86 4.816 561 1 -0,19 0,86 1 -0,52 0,86 5.104 589 1 -0,19 0,85 1 -0,52 0,85 5.424 624 1 -0,19 0,84 1 -0,52 0,84 5.697 667 1 -0,19 0,84 1 -0,52 0,83 5.988 695 1 -0,19 0,83 1 -0,52 0,83 6.286 680 1 -0,19 0,81 1 -0,52 0,81 6.565 704 1 -0,19 0,81 1 -0,52 0,76 6.857 764 1 -0,19 0,83 1 -0,52 0,82 7.056 784 1 -0,19 0,85 1 -0,52 0,83 7.306 643 1 -0,19 0,84 1 -0,52 0,81 Cleaned MAF and checked for leakages already. I'm pretty lost here.... Need a new MAF, O2 sensors, check hidden leakages??? Any suggestions will be wellcome. Thanks
