1994 Plymouth Voyager Engine cutting out

BIRDMAN1994

MEMBER
1994 PLYMOUTH VOYAGER
6 CYL
FWD
AUTOMATIC
234,000 MILES

1994, Plymouth Voyager Sport, 3.3L, Fuel-Injected. On occasion (every month, or couple of months or so) my van will run very rough. It will cut-out, occasionally backfire (not loud, just a puff). It has happened in all seasons & temps (in PA we have all seasons & temps). Under load (if I mash the pedal), it has all the power it needs, but if I try to hold a constant speed, it cuts out completely, and also will at times act like it's only firing on half the cylinders. The check engine light is on and has been since I bought the vehicle 6-years ago - as well as this problem has persisted. I've replaced: plugs, wires, cap, fuel filter, & fuel pump as well as rebuilt the entire top end 2-years ago. It has 234,000 on it, but is in great shape. Any help with this problem would be greatly appreciated. Thank you.

4 Replies

JACOBANDNICKOLAS

MECHANIC
108,355 POSTS

Hi:
If the check engine light is on, have you ever had the computer scanned for codes? Many parts stores will do it for free.

Joe

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Monday, February 23rd, 2009 AT 1:21 PM

BIRDMAN1994

MEMBER
3 POSTS

Thank you for the reply. Yes, I just took it to a dealership last week (unfortunately didn't realize most parts stores would do it for free, $70 later). They said the codes came up that the O2 Sensor and EGR valve needed replaced ($440). If the sensors are bad, wouldn't it behave badly all the time, not run good for a month or so and then run rough? The engine light is on all the time, whether it's running good or not.
Thanks again for answering.