Hello,I have a 1994 Dodge b250 van. The distributor has been moved, so I need to set it back to the correct timing mark. Does any body know what that is? I have been told that I can't, why not?

Question edited for clarity.
Question moved to model category.

It appears to be a known issue.

Speedometer/odometer in 1992 Ram B250 not working

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Dodge B250 Speedometer Is Not Working

RepairPal.com https://repairpal.com > dodge > speedometer-not-work...
The most common reasons a Dodge B250 speedometer isn't working are the vehicle speed sensor (VSS), a faulty speedometer, or an electrical issue.

Q&A: 1994 Dodge Ram Van B250 Speedometer Not Working

JustAnswer https://www.justanswer.com > Dodge Repair
Apr 22, 2009 - You will need to check to make sure that the sensor is turning.if you jack the back of the van up and remove the sensor.put it in gear and ...

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SOLVED: I have 1992 dodge B250 van the speedometer is

Fixya https://www.fixya.com > ... > 1988 Dodge B250
Feb 22, 2011 - If the speedometer is working but the counter is not - then the counter gear is broken. it is not worth trying to fix -- just buy a new ...

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Clean fuel lines and change injectors

According to the book, you are supposed to mark the rotor on the distributor before removal and then put it back in place. If the crank has been moved, you align the mark on the crank damper with zero on the timing cover when the number one cylinder is at TDC. Then put the distributor in so that the rotor is pointing to the number one plug wire. It does not say anything about using a timing light.
You may want to check out a repair book in an auto parts store to get the details.

your local parts store should be able to look it up for you along with capacity

The fuel pump relay gets power from a 30amp fuse that also powers the ASD relay. I think the fuse is marked with the letter D.
You may have to check the 30amp fuses to see if any are blown.
You can also jumper the pump relay.

check to make sure distributor electrical wires been reconnected to distributor.and check to make sure distributor is receiving 8 volts supply from the pcm.check see if orange wire going to distributor to pcm getting power. because spark plugs not firing could be pcm, coil itself bad or crankshaft sensor bad. i would code scan vechicle before buying new parts ignition.timing off if you did not have distributor in number 1 firing position before removing the timing chain.

I suggest visit and check autozone.com (free register) for 1988 Dodge Truck B250 3/4 ton Van 5.2L FI 8cyl, several wiring diagrams in there.

Hope helped (remember rated this) Good luck.

Cam Sensor is the Main Cause of Your Discription

The distributor in that engine can only be installed in one position. The hold down is built onto the distributor meaning when it is installed and the engine runs the computer is responsible for the timing. The distributor will move a little but won't correct major timing errors.

i'm the chevy guy. are you talkin distributor timing or timing chain timing?