Engine Performance problem
1988 Ford Crown Victoria V8 Two Wheel Drive Automatic 140000 miles
1988 Ford is in good condition, well maintained. It has developed a myriad of symptoms over time. They are INTERMITTENT and they are as follows:
>Sometimes engine stalls after startup.
>Engine stumbles and misses at low speeds ~30 - 35 MPH but will respond to stepping on throttle more but pings.
>Poor fuel economy about 30 - 40% below normal.
>If the problem occurs when pulling a slight hill, the engine will ping severely.
• Corrective action taken so far within past month.
New fuel pump (twice) fuel rail pressure is normal.
New fuel filter.
New EGR Valve
New EGR Position Sensor
New EGR Vacuum Regulator (EVR)
Vacuum leaks found and fixed
New spark plugs (correct Autolites)
Ignition timing checked and corrected (was 7 ° too advanced)
Plug wires, cap and rotor replaced 40,000 miles ago.
Catalytic converters removed and inspected and are GOOD.
The engine does not burn oil and does not make any strange noises.
There are no exhaust gases in the cooling system. (No leaky head gaskets).
Removing the vacuum line from the EGR valve and plugging the hose seems to alleviate the problem if it is occurring. If we put the hose back on the EGR, the problem will soon return. Note that the EGR, EGR position sensor, and EVR are all NEW as of one day ago and the old parts were confirmed bad, sticking, or erratic.
These problems will occur anytime, and for sure will happen after driving no more than five miles, and are getting worse as time goes on.
BUT when the problems are not there it runs perfectly with plenty of power.
have the same problem?
Friday, September 11th, 2009 AT 4:25 PM