2003 Ford Crown Victoria Engine Missing

NASEERNJ

MEMBER
2003 FORD CROWN VICTORIA
V8
2WD
AUTOMATIC
145,000 MILES

2003, Ford, CV Police Interceptor
Symptoms
Car missing between 40-60MPH on low throttle & normal engine heat.
Car not missing in cold engine.
Engine runs smoothly in low speed and high speed (0-40MPH & above 60MPH).
In 40-60 range, engine especially misses more when there is a gear shift from the auto trans.
In 40-60 range and engine is missing, removing throttle removes missing.
In 40-60 range and engine is missing, high throttle removes missing.
At high throttle, Check Engine flashes ON/OF for some seconds and then stable ON.
Check engine is permanently ON (Purge controller. Will fix it soon)

History
Car was running good until recently went through a parts replacement (Intake manifold – The whole thing looks like fiber re-enforced body).
Noticed coolant leak from the base of the inlet hose pipe connection. (Upper radiator hosepipe which takes coolant into the engine). Ignored this minor coolant seep and did not top up the coolant until coolant high temp (No indications. It was just the temp gauge that went a few notches up than the normal). That was the time when missing started for the first.
Further diagnose revealed that the intake body was slightly chipped off from the inner side at the coolant entry point and coolant was going into the cylinder as well as shorted the plugs.
Dried the cylinder, replaced plugs, cleaned injectors (they were already clean) and replaced the intake with new. Car was good for ½ hour of test but then the missing started and persists till date. Coolant level is good (Been 3~4 weeks from intake change and drive ave. 30Miles a day) and coolant temp is normal.

8 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Have you had the computer scanned? Most nationally recognized parts stores will do it for free.

Let me know.
Joe

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Monday, May 3rd, 2010 AT 8:53 AM

NASEERNJ

MEMBER
8 POSTS

Hi Joe.

Thanks for the reply. Haven't pulled the codes yet. Me the lazy bum.
In this part of the world (Dubai), I wish to have a parts dealer
who would do codes for free.

There's been some development though. The car missing, most of the times
turns into jerks. It almost seems like 1 or more ign-coils are bad.

Is mearsuring coil resistance (when engine is hot) a good way to find the
coil good/bad status? Like I poked an ohm meter into one of the easily
accessible coils today and it gave a 2 4 ohms reading on the ohm meter.

Am I getting some where? Will I get somewhere?

The plot thickens.

Yesterday, the car borke down and won't crank (No power to the solenoid -
Starter motor). Hooked it up to friends car and towed it to a nearby auto
electrician. Early diagnosis, revealed no power in the starter relay.

So, possibly either it is the P/N transmission switch or the key switch that
needs to be further checked. As a temporary solution, the auto-electrician
bypassed the safety checks and inserted a cable into the solenoid realy contacts
to manually start the car by shorting it to the battery. Yeah. I know this is
dangerous. So, I only do it when the car is in park. Parts have been placed
on order. Perhaps within a day or two we'll get this done.

Towing the car wasn't easy. Especially and surprizingly, there was no place
on the bumper re-inforcement to hook the towing rope. So, carefully clamped
it in the middle of the re-inforcement.

Now, I have the SRS light lit up.

Dude I am telling you my panel is lit up with all sorts of lights. Name it.
Check engine, battery, ABS, Emergency brake + SRS Bag (New addition).

And the car still takes me to work. Love this CVPI babe.