Engine Performance problem
1998 Chrysler Neon 4 cyl Front Wheel Drive Automatic 155000 miles
I have a 1998 chrysler neon, the car will start fine, idle great with no surges but when you step on the throttle it sputters and or bogs down. When you quickly step on the gas to full throttle, it just bogs and does not rev. If you slowly give throttle, the car revs to much much higher rpms like it should but again quick full throttle bogs it down.
The same thing applies when you put it in gear or under load, the car will hesitate and sputter untill it reaches it seems like the right amount of air and you can feel the original power but then cuts off untill you hit 2K rpm steady or higher, then the car seems to run fine. At highway speeds, the car runs great no hesitation under load at higher rpms. At high speeds when the rpm drops a little when the tranny is not locked, you can give it throttle and it responds beautifully. The problem is when it is throttled from lower rpms to achieve higher rpms. Sometimes it does it and sometimes it seems to run half way decent. Please help, don't know what to replace, the fuel pump or the ignition coil pack/wires, I have already replace the sparkplugs.
Inspect and test all the following listed below: Oxygen sensor.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.
Note: If it doesn't apply disregard
August, 19, 2010 AT 11:44 PM
The problem was the fuel pump was getting around 12psi while it should be getting 20-30psi. Changed the fuel pump and the car ran great.