1996 Dodge Caravan A Few Issues

Hi chadduke. Welcome to the forum. You'll have to elaborate on the electrical problems. Can't offer suggestions if we don't know what it's doing. The noise you're likely hearing is the solenoid pack for the transmission. They are "duty-cycled" by the transmission computer to soften the engagement of the clutch packs so they don't bang harshly into gear. Think of it as slipping the clutch on a manual transmission to get the car going. To simply turn on a solenoid which activates one of the gears would be the same as slidding your foot off the clutch pedal and letting it spring up quickly. Sure, it might go, but it wouldn't be very comfortable. Duty-cycle means the solenoid and valve are turned on and off very rapidly to slowly build up fluid pressure in that circuit. It is necessary to do it that way because solenoids can only be full-on or full-off. There's no in between like there is with a sink faucet. The buzzing or ratcheting noise you're hearing is most likely that solenoid turning on and off. It will occur during a downshift to first gear and when shifting into drive or reverse. Normally you won't even hear it unless you have the window open. It only lasts for about one second. If you think I'm describing a different noise than what you're hearing, find a similar Chrysler vehicle with the four speed overdrive transmission and see if it makes the same noise.

Hard to determine a cause for the sputtering. If the Check Engine light was on at some point, there will be a diagnostic fault code memorized in the Engine Computer that will send you in the direction of the problem. The MAP sensor is a good possibility for causing this type of problem but they normally fail completely within a day or two. The throttle position sensor could also be a suspect but they really don't give much trouble.

Caradiodoc

The noise is supposed to be there. When it no longer occurs is when you have other problems.

Look for a loose or blown fuse for the light issue. The interior lights are controlled by the Body Computer. The advantage to adding a computer to this otherwise simple circuit is the lights will turn off after 15 minutes to avoid draining the battery. The disadvantage is that every time you add a computer, you unnecessarily complicate the circuit and add to its unreliablity. The Body Computer on '96 and newer minivans has been by far the biggest source of trouble related to adding a computer. They also are very commonly the culprit in the wiper problem you mentioned. You might want to try plugging in a used multifunction switch, (turn signal switch), on the rare chance it is defective, but 99 percent chance it will need to have the Body Computer replaced. It is bolted to the fuse box above and in front of the brake pedal.

Check those fuses too. They often become loose in their sockets and will sometimes even fall out onto your ankle. There is another fuse box under the hood.

If the sputtering is consistant, your mechanic can connect a hand-held computer, called a scanner, with a record / playback function. That can be used to record about five seconds worth of sensor data when the problem occurs. He can play that information back slowly later to look for clues to the problem. Since the data travels through the memory in the scanner, the recording actually begins a couple of seconds before the button is pressed. This is one way to find engine performance problems that don't act up long enough to set a fault code. There can be other fault codes too that don't turn on the Check Engine light. He will use the same scanner to read those codes. Low fuel pressure is real common on GM products and will cause this symptom, but it is rare on Chrysler products. The fuel pressure is not monitored by the Engine Computer and won't set any fault codes directly, so it will have to be measured with a mechanical gauge if it is suspect.

Caradiodoc