I replaced all 6 plugs and wires on my boyfriend's 2003 Caravan without removing anything, such as the window wiper assembly, but I weigh 125 pounds. The back spark plug on the right (next to battery) was almost as easy as the front three, but the last two were a pain. The middle one was pretty difficult because once the plug is out you need to blindly put the new one in without accidently getting a bunch of garbage in the combustion chamber. For the one near the air filter, by far the most difficult, I had to go to the store and buy a short ratchet and reach both arms in there to loosen the old plug one click at a time. That last plug is VERY deep in there, so I dont recommend a 90 degree ratchet like I used. If you dont have a strong, skinny-armed person at your disposal, I'd recommend taking it somewhere, or removing either the air filter or the windshield washer assembly.
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A Chiltons/Haynes repair manual that covers this vehicle make/model/year will have the information you seek. Plus a lot of other goodies. I'll give you the gap for the 3.3 V6 used in the 1984 thru 1995 (we use it for our 1998 Grand Caravan). okay per tune-up specs, that spark plug gap is, drum roll please, 0.050 inch/1.3mm. These specs are for the OEM spark plugs Champion RN14MC5. Best of luck accessing the 3 on the back side.
Four digit codes are brand specific. Code 2302 for a Chrysler product means the secondary circuit for the coil on cylinder one is at fault. If you have replaced the coil and plug wires, it could be a problem in the wiring harness between the coil and the engine computer.
I understand the coolant temperature sensor on a 2003 caravan is located just under the coil.
There are two sensors located in that position, it's the one toward the passenger side of the car.
I'm changing mine in the morning so I will know for sure and if it's not there I will return and correct this post.
Replacing spark plugs (2003 caravan); can be done from the top, reach around the engine (not over) from the transmission side to get to the rear spark plugs, I have done this twice.
you need to put a ratchet ******** the front of the engine and remove the dog bone engine mount this will allow the engine to be pulled forward with strap and you can reach behind and remove the plugs or you can get them from underneath the van hand tightened with a spark plug socket and wrench if you overtighten they will break