98 crown vic idles great put it in gear and it will barely run. Just purchased it and no battery in it so therefore it hasn't throwed a code yet
Hello, when you start it next, let the engine run at 1500RPM for about 10 minutes. In a state that has an Emissions test, that RPM is fast enough to measure the tailpipe Emissions. It therefore means all the Sensors should be working and reporting to the onboard computer. If something is going wrong a Code should pop up.
There is an automatic Parking Brake release which can use vacuum. When you shift out of Park, the valving on the switch moves and routes vacuum to the release. If the release diaphragm is leaking or the switch is cracked, it will lose Vacuum and the engine won't idle in gear.
Check your Intake manifold for Vacuum leaks in Park, with the motor running. Use either a water spray bottle or choke cleaner that is safe for plastics and rubber. Spray around seams and on Solenoids with Vacuum hoses. Check your EGR valve.
You may want to do a fuel sample and install a new fuel filter. At idle or out of gear you are not putting a power demand on the motor. Flat fuel can show up when the engine demands power.
Clean your sensor in the air Intake with Electronics cleaner. Check your trans fluid. There is also a TPS throttle position switch which may be giving the wrong info when you need to push the throttle down farther to move your car.
I hope my solutions help and you can use the reply for more help later.
Feb 06, 2011 |
1998 Ford Crown Victoria