You either have a bad catalytic converter causing too much back pressure or you are running rich. I think cylinder 3 and 6 are on the same side of the engine (except opposite banks) right? Locate the fuel pressure regulator. Is it on the same side? I've seen those go bad and allow fuel to be sucked into the vacuum line causing a rich condition/ misfire on two or three cylinders on that side of the engine.
SOURCE: No Start, No Spark, for Grand Caravan 3.8L
we get remans bad out of the box......... good luck
SOURCE: check engine light comes on and car idle's and
I found this; if it helps.
The injectors need to be cleaned, if an engine is experiencing any of the classic symptoms of dirty injectors, such as lean misfire, rough idle, hesitation and stumbling on light acceleration, a loss of power, and higher hydrocarbon (HC) and carbon monoxide (CO) emissions.
Lean misfire may also trigger a misfire code and turn on the Check Engine light on 1996 and newer vehicles with OBD II systems. The code often will be a P0300 random misfire code, or you may find one or more misfire codes for individual cylinders, depending on which injectors are most affected.
the web page was:
http://www.aa1car.com/library/2003/ic30336.htm
Hope this helps
SOURCE: Check engine light
A multi misfire may mean that one or more of the following has happened:
Faulty spark plug or wires, Faulty coil (pack), Faulty oxygen sensor(s), Faulty fuel injector(s), Stuck/blocked EGR valve / passages, Faulty camshaft position sensor, Defective computer.
The engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wire, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
Good luck and hope this information helps, keep me posted, be glad to help you get the truck running 100% again. Not sure if your running a K&N air filter, and if you are there may be a flim of oil on the MAF sensor that is making you run lean. You may want to spray down the MAF sensor with a can of MAF cleaner.
SOURCE: 2007 Nitro Misfire with no codes
Keep going back to the dealer. This is an emissions issue and is covered under warrenty. If anyone else works on this you could void your warrenty for this issue. I know its frustrating but the dealer is the only way to go. Maybe you need a differnt technician to work on it or even a differnt dealership...
But if it were my car I would fill it up with chevron 91 and add two bottles of techron cleaner. At 1/2 a tank fill it up again run the remaining fuel to low and then hope it cleared up.
If the injectors are spitting, BAD, instead of spraying ,GOOD. then you will have excess air from a misfire going over the 02 sensor. The computer will keep opening the injector ontime to maintain a 14.7 to 1 air fuel ratio. As soon as the injectors are at their max the car will buck like you running out of fuel.
This is about the only thing you can do at home.
You could try replacing the fuel pump relay and the ASD relay if you have them under the hood in the fuse box. There only about 15 to 20 bucks for the 2.
If you can feel the misfire and you see it happening on a scanner then look at the injector ontime. . This will give you an indication of the injectors being opened which would point to a fuel issue or vacuum leak
A vacuum leak could be the plenum gaskets are leaking
SOURCE: 99 dodge caravan #4 cylinder misfires, i replaced
This is a known dodge issue replce the injector!!!!! done deal
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