Boxster losing power
Hi Forum,
After the winter stand stil I realized that my 2,5 boxster 1998 had a hard time raving beyond 4000 rpm at load. It has no hesitation, misfire or anything else and it starts idle and actually drives quite smoothly. I notised hat I have two codes which keeps coming back P1123/25 Oxygen sensing limit adaption range 1 ( cyl 1-3) and ( 4-6) Consequently we did put it on a Dyno , see photo below were sad results, only 122HP at 5000RPM The guy stoped the dyne run here explaining that it had sever fuel starvation. ( he had a probe in the exhaust, and I guess that he meassured it to be lean) I guess that that matches the codes. Is there any obvious places to look except for the fuel filter. http://986forum.com/forums/uploads02...1490700510.jpg BR KIm |
Look at the Mass Air Flow Filter (MAF) - when this part starts to fail, it often exhibits the symptoms you describe. A quick test is to disconnect the sensor and let the car run using a default map - if it runs better, you know you have a failing MAF sensor.
Porsche Boxster Mass Air Flow Sensor (MAF) Replacement and Troubleshooting - 986 / 987 (1997-08) - Pelican Parts Technical Article |
Agree - replace fuel filter and do the MAF-disconnect test.
But maybe time for a big service? If you didn't put Stabil in the fuel, it may have gelled ? Fuel pressure regulator ? If the O2 sensors are getting 'old & lazy' ,changing them and the plugs may help. Air filter? |
Hi
Thanks for the advises. Fuel pressure checked today by my mechanic , and it was OK. The Airflow through the MAF was according to the Mechanic measured to be too low . I guess that this will reduce the amount of injected fuel accordingly? New one is ordered and it will be installed tomorrow. BR KIm |
Make sure rodents have not built a nest in your air filter.
|
air filter is brand new:-)
br kim |
Bart,
Slow down. The only piece of diagnostic data (not performance data) you've got is : "The Airflow through the MAF was according to the Mechanic measured to be too low " Please don't feed us info piecemeal and partial. If the Mechanic has done a complete test ,give it to us - the RKAT,FRA ,fault codes - all of it. Otherwise this is just random speculation which will waste time(ours) and money (yours). Airflow - we need the actual value in gramms. Meanwhile remove the airfilter and retest briefly .Big change ? Check/clean the TB .You are looking for obstructions. Please tell us you don't have a K&N (or similar) filter fitted. Without a Durametric connected and freeze frame data to post this will be difficult to diagnose logically and methodically. |
Power is Back
Hi Gelbster,
Airflow was 90 ltr/sec and the Engine incl filter is all stock. Anyway the MAF was exchanged and all the power is now back 213 HP /270 NM Not bad for a 19 year old car which has done 156.000 km :-)http://986forum.com/forums/uploads02...1491226164.jpg BR KIM |
All times are GMT -8. The time now is 01:26 PM. |
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website