Cam Hall Sensor
 Volvo - Cam ( Hall Effect) Sensor - Hella - 9146108 US $147.99 
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1993 Dodge 2.5L 4 Cyl. SOHC timing?
I have a 1993 Caravan, 2.5L 4 cyl. TBI in the shop that runs horrible - surges, skips, stalls at low speeds & idles rough. Always starts right back up.
Fuel pressure good (14 PSI), timing belt correct, compression 120-125 all cylinders, cap rotor and wires look good, cam looks good, intake vacuum excellent but naturally vibrates when the engine takes a fit, has new plugs and no fault codes or check engine light.
When I put a timing light on the flywheel, the mark jumps all over the place and stays visible in the window only when the light is set for over 30 degrees.
Any suggestions would be greatly appreciated - parts that have been suggested are the, hall effect distributor pickup, the MAP, the PCM, the speed/distance sensor and so forth. I really don't want to start throwing parts at this thing on a hunch.
Thanks.
The distributor pickup is a common problem on that vehicle. They also had problems with the MAP sensor. Usually a map sensor failure will cause the van not to run at all, and if you unplug the sensor it will start and run poorly.
Start by pulling the vacuum line off the map sensor and making sure that there is vacuum from that line. if so, unplug the MAP and see if that causes any changes. If there is no change, then the problem is either in the MAP sensor or a loose connection.
If there is a change in the way it runs, I would bet that the problem is the distributor pickup.
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