Watch "P0171 rx8 help" on YouTube - P0171 rx8 help: http://youtu.be/3XR-yiZ2o44

Please take a look n that video n youtube and can you please tell me what has happened becuse the exatct thjng is happening to me in my car rpm needle does the same thing when I rev , got the CEL and it says P0171 .
mine is 04 rx8 with 34,000 km s

 

P 0171 is usually always a leak post MAF, generally it is intake gaskets, intake boots and the like. If you get a hold of a smoke machine it will help pin point the area.

 

thank you for the quik responce , and why does the rpm needle does that wired thing when rev ?

 

If 171 is a vacuum leak, the ECU is massively confused trying to correlate the MAF readings with the 02 sensor. I knows it is lean (from the 02, and is pumping in all the extra gas it can) up to a limit, and still lean. Depending on where it is, the leak confuses it more. A leak before the throttle body will show up more at high RPM, one after it will show up more at low RPM. Either way, fix it. Look for a broken or lose vacuum hose. Also, check the rubber tube the MAF plugs into. I had a 6 with a cracked tube. It only was an issue when you were on the power, and the engine moved, and opened up the holes. PITA to find. At idle it was perfect with no leaks.

 

and sir I want to mention this as well like 2 days before this happens I found a unpluged vacume line and it was not pluged to enythng but the car ran fine no problem at all but when I found it I connected it for little sensor on the top righ hand side ,my friend said it should be the map sensor, and agin I disconected it cz it was fine erliyer without it so, is t the reson caused this sir ?

 

guys please give your opinion as im helpless

 

Plug in all the lines.

The computer will adjust around a lot with the fuel trims. When it can no longer adjust, it throws that code. There may be something else wrong, but if you have an open vacuum line, it will likely cause that error, and will cause damage if the engine runs too lean. Reconnect everything. Post of a picture of the line that was disconnected if you can, and reset the code. Let us know how it goes. If you could also post data on the car, and your location, we might be able to help a bit more.

Also, you keep saying MAP. There is a MAF (Mass Air Flow Sensor) with several wires running to it just after the air filter box. This should be inserted, with no leaks around it it, and wired up.

 

Sir juat found out the name of the sensor I mentioned , it is the EGR BOOST SENSOR is it the reson for this do I need to xonnect the vacum line for it

 

is this egr boost sensor need to be connect with a vacuum line ?