I replaced the Intake manifold gaskets on my 2000 Dodge Caravan 3.0L. I got everything back together and noticed I'm missing one of the vacuum lines. On that tree part of the upper intake plenum, I have the vacuum booster hose(large diameter) connected and the EGR Valve(small diameter) connected, there's a 3rd connection(small diameter) that is missing. I would like to know where that line is supposed to run to so I can find it and reconnect it. Any help would be greatly appreciated
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Re: Missing vacuum line on 2000 Dodge Caravan 3.0L
I do not have the solution for you but I will make a suggestion if you do not get an answer from someone else. Find a 2000 Dodge Caravan like yours at a used car lot and pop the hood and take a look. That may be your quickest solution.
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If you did the timing belt install, check the spark plug wires and fuel injector wiring connections and harness before tearing everything back apart. Also confirm the vacuum lines are connected as well as the intake air tubing. On a 2007, there shouldn't be very many vacuum lines to contend with. In general, check for any sensors that are missing connectors or any connectors that appear clean inside, suggesting they were recently connected to something. If you paid someone for the timing belt replacement, take it back and have them dig through the above suggestions.
It sounds like vacuum is not getting to the vent, heat and A/C controls. Find the vacuum can. It may be under the hood on one of the inner fenders. Trace the lines back to the vacuum block at the intake manifold or fire-wall, and also back to where the line goes thru the fire-wall. Check the can for leaks or obvious holes. They used to be just a plain metal can, but it could be a plastic ball. Check the lines as you go for breaks and rub-thru's. Move the controls thru all settings and listen for vent door movement. (Run the engine momentarily to build vacuum in the system.) Worst case is a bad vacuum motor or air flow position selector switch.
You can purchase an intake manifold gasket set from a local parts store. It should have the upper and lower intake gaskets contained in it. I see you plan on doing the valve cover gaskets as well. It might be a good idea to replace the plugs and wires at the same time to save some trouble down the road. I would recommend doing the oil change and change the thermostat at the same time as well.
The symptoms you're reporting indicate you have a vacuum leak. Look for;
1) damaged, loose or missing vacuum lines.
2) loose throttle body.
3) unplugged opening in the intake manifold or
4) loose bolts or missing bolts on the intake
5) If you have hard shifting as well check for a loose
or missing vacuum line on the transmission.
You can use canned ether to check suspected leaks, the engine will either rev or sputter if there is a leak. Don't just spray the ether randomly that is very dangerous. HAVE A FIRE EXTHINGUISHER HANDY, ETHER IS VERY FLAMABLE! CO2 exthiguisher is best, dry chemical make a nasty and hard to clean up mess that is caustic.
Replace the spark plugs and plug wires unless you have already done so. Also check all vacuum hoses for leaks. After doing this post back if you still have the same issue. Remember to replace the plug wires or vacuum hoses one at a time as to not get confused. This will more than likely solve your random misfire. Reset the light after the repair with your scanner.
I HAVE A 96 DODGE CARAVAN WITH A 3.8L ENGINE..I HAD SIMILAR PROBLEM AND IT WAS THE UPPER INTAKE PLENUM GASKET HAD PIECE MISSING OUT OF IT..MISSING ON #5 CYLINDER AS WELL..GASKET WAS ONLY ABOUT 10 BUCKS AND I REPLACED IT IN ABOUT 30 MINUTES..TOOK ALL BOLTS OUT OF MANIFOLD AND JUST LIFTED IT UP HIGH ENOUGH TO GET OLD GASKET OUT..MIND YOU..I'M AN EXPERIENCED CHRYSLER TECH AND DO A LOT OF ENGINE WORK..SQUIRT SOME BRAKE CLEANER AROUND UPPER INTAKE AND SEE IF ENGINE SMOOTHES OUT..LET ME KNOW WHAT HAPPENS
Pull the oil dipstick and see if you have a lot of bubbles in the oil. If your head gasket is blown you will have coolant mixing with oil causing the bubbles. If you don't see the bubbles, you may still have a bad head gasket but should consider that it may a be a bad intake manifold gasket. Look on the ends of the engine block - where the transmission attaches on the driver's side and the drive belt is on the passenger side. Look for signs of coolant leaking onto the outside of the block castings at the base of the lower intake manifold chamber (it looks sort of like the flattened bottom of a V) . If it's there you may just have the manifold gasket leak. My '03 T&C with the 3.3l had this problem. It ran rough, and only with no pedal being applied. Driving was tough to get it to the shop since it died at each stop light and required the gas pedal to be feathered to keep it running.
If you have more than amateur skills you can replace it yourself.