01 civic ex big problem

[superex1987]

hey guys my bros 01 civic ex 5 speed VTEC manual is acting up
it wants to idle realy realy low and stall and hesitates when you push on the gas but the engine speed will increase and is hard to start
the plugs and air filter have been changed but it didnt help
its throwing 2 P0171 codes and they say its runnung to lean
i have searched hard and long to find an awnser and have come up with nothing
thank you for the help

[hxgaser]

Well some things to check...

1. Vaccuum leak... While the car is running spray WD 40, carb cleaner or any aerosol type spray around throttle body and intake manifold runs. If you notice a sudden change in RPM, you have a vaccuum leak.

2. Check fuel filter... Is it clogged? It is located near the left rear wheel.

3. Throttle body assembly, including Throttle Position Sensor (TPS)... First open up your air filter housing and look down to the throttle body. The butterfly should be pretty clean. If not get some throttle body cleaner and spray the heck out of the plate. You can use old tooth brush to scrub both sides of the plate and the wall around the plate. Once cleaned, go get a q-tip and regular house hold oil, such as 3-in-1, apply a couple of drops of oil to q-tip and apply to the ends of the butterfly shaft where it is going into the wall. Crank the car and start it. It will run really shitty for about 20, 30 seconds, but it should get better. Also when you clean the throttle body, Throttle Position Sensor resets after a few minutes. While you are cleaning the throttle body, if you notice play in throttle body shaft, then you have a bad throttle body.

4. Injectors... If the problem happened all of a sudden, then it probably is not related to the injectors. When injectors go dirty, you tend to notice gradual decrease in performance over time.

5. Fuel Pump?


Anyways, I recommand that you check things in above order. Start from the simplest task.

Hope you find the problem.

[BrodyP]

Register with www.7thgencivic.com and run some searches. This would be the easiest place to get an exact answer to your question. Alot of results are generated when running searchs for key words regarding your issue. You would have a better idea of which thread would fit your issue by doing your own investigating.
Good luck!