My grand voyager check engine light keeps coming on,but i do not know the problem.its a van.

It Probably has to do with the oxagen sensors, Or you could have a blowin head gasket,

engines are not very good, engine will come out from top, not easy without proper tools

Check the wires, could be grounding out somewhere. Make sure wire casing is not cracked or worn away.

First thing i would try is to carry a can of WD-40 or quick start with me and when it quits and won't start, remove air intake hose at throttle body opening, open throttle enough to give a good spray inside throttle body, release throttle, then try to start it . If it starts and runs momentarily, you have a fuel delivery problem. If not you have an ignition problem. Then you can start troubleshooting from there.
Or you can carry something to test for spark. I just find this way easier. Don't know when/if fuel pump has ever been replaced, but not uncommon for them to work when cool and quit pumping when they get warmed up, even though they sound like they are still working. That's where a fuel pressure test would also confirm, keeping in mind pressure may read good when first started but will drop later when warmed up and engine quits.

I have replaced alot of transmissions in thease vans, i would try changing the filter and fluid, if that doesn't help you may be looking at replacing the tranny.

check your gas cap it might be loose ,if that doesnt work take your van to your mechanic and have them scan the computer to find out the problem

How many miles are on your van? If it is alot of miles your trouble is likely engine wear, but if the miles are not that high or you know the van has been serviced like it should be than maybe replacing the oil pump will help the problem. Backing up now, the first thing to do is check the actual oil pressure with a known good manual gauge, not the light in the dash.

I had the same thing happen, No, I was told this is not one of the engines that allows the piston to contact the valves. I replaced the timing belt 2 years ago and had no valve problems.

You say you changed the cap and rotor so I'm assuming the van has a 3.0L? Possible injector problem on cylinder #5, swap injector with cylinder 1 or 3 and see if miss/dtc moves to that cylinder. You also could have a vaccum leak, although they usually won't come and go. Does the vehicle have a consistent miss or do you just have a check engine light?

I still don't know what engine is in this van It can be a 2.4 (4 cylinder ) , a 3.0 ( 6 cylinder ) , and a 3.3 ( different maker 6 cylinder ) the engine trans mission systems are made by different manufactures and without this information it's like telling me car is the blue one. you know the problems that happen to the blue ones. Sounds like the exhaust is stopped up