2003 Dodge Truck

CHARGER383

MEMBER
2003 DODGE TRUCK

Engine Performance problem
2003 Dodge Truck V8 Automatic 85203 miles

My truck runs fine for the first 4or5 miles and when I stop at a stop sign it sometimes stalls but starts right back up. Then it will run fine for a mile or two then lose power and act like it is only running on one or two cylinders. I shut it off then it will start right back up and run fine for several miles!

The check engine light is on and it shows a Trouble Code P1494 Evap Leak Detection Pump Pressure Switch.
Would this cause the truck to act like this? Also where is this switch located?
Thank's
George

1 Reply

CARADIODOC

MECHANIC
33,916 POSTS

Two things come to mind, ... Ok, three. A plugged pickup screen attached to the fuel pump will cause stalling when the highest volume of fuel is flowing, which is during coasting. (This is not the same as the tiny volume that is syphoned off to enter the engine). This will show up with a fuel pressure gauge while you are driving.

A stuck open EGR valve will adversely affect engine performance at idle, but will not be noticeable at higher speeds because that's when it's supposed to open.

A MAP sensor that is starting to fail can cause this symptom. Even though the value reported by the sensor could be incorrect, as long as it is between acceptable limits, the engine computer will believe it and not set a fault code. The MAP sensor has the biggest affect on fuel delivery to the engine. They usually don't take too many days to fail completely.

Caradiodoc