1994 Dodge Caravan Hesitation feels like stubbling

Tiny
JWILL49
  • MEMBER
  • 1994 DODGE CARAVAN
Engine Performance problem
1994 Dodge Caravan 6 cyl Front Wheel Drive Automatic

What could cause my van to hesitate and stumble when driving, It now has a loud popping sound like it is back firing.
I've did a complete tune up and changed the egr valve and still having the problem, could it be the catylistic converter and 02 sensor gone bad?
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Saturday, April 17th, 2010 AT 9:42 AM

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Tiny
CARADIODOC
  • EXPERT
Hi jwill49. Welcome to the forum. One real common cause of these symptoms was the original spark plug wires, but they should have acted up a long time ago, and it only applies to the 3.3L engine. A partially plugged catalytic converter can cause this too, but it is not typical of an oxygen sensor. Usually when the converter is plugged, the engine will idle uncommonly smoothly and you will hear more of a hiss from the tail pipe instead of the normal "thump thump".

A cracked core for the crankshaft position sensor will generate extra or incorrect pulses causing cylinders to fire at the wrong time. This can be hard to find without a diagnostic scope. The core doesn't usually crack on its own. It occurs from inproper installation procedures. New ones will have a thin plastic rib or a paper spacer on the end to set the correct air gap. The rib will partially wear away or the paper spacer will slide off when the engine is started. When reinstalling a used sensor, any remaining rib must be sliced off, then a new paper spacer installed to set the gap. Spacers are available from the dealer's parts department.

The MAP sensor can cause this when it sends incorrect values to the Engine Computer, but eventually it will fail completely and the Check Engine light will turn on. This sensor doesn't take very long to fail completely; rarely more than a few days.

Caradiodoc
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Saturday, April 17th, 2010 AT 2:05 PM

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