Randomly stalls

OCEANPATRIOT

MEMBER
1994 DODGE DAKOTA
3.9L
V6
2WD
AUTOMATIC
76,000 MILES

It now randomly shuts off (while driving). It will restart after sitting (no regular time frames noticed to restart). No specific weather noticed. As it shuts off it "bucks" as if downshifting or going to neutral. Sometimes it will start right up or make you wait for hours (although it does crank) I am only getting the "12 and 55" codes. The battery tests good, and has new connectors. No check engine light showed.

Tuesday, January 29th, 2019 AT 12:10 PM

1 Reply

HARRY P

MECHANIC
2,295 POSTS

Thanks for using 2CarPros. When it's acting up, check the fuel pressure. You can get a fuel pressure test gauge from the local auto parts shop's loan-a-tool program for free. That pump pressure should be at least 34-45 psi when the engine is idling, and 5 or 6 psi higher with the key turned on, engine off.

Chrysler's test is included in the attached image. Ours can be found here: https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Check the pressure when it's running well and starting the way it's supposed to, and then again when it dies and won't restart. Record pressure for when the key is on and engine off, and when it's idling. I'll bet there's a big difference. If so, we'll go through how to change the fuel pump.

Harry

Image (Click to make bigger)