SHAKES AT IDLE !
If it has not set a check engine light it likely is not a misfire, these models wear out the engine and trans mounts by about 80,000 miles. if it is misfire you will need to read the fault codes and go from there.
SOURCE: My 2003 subaru forester idle very rough. if you
1) Check all the vacuum hoses for a leak in the rubber hose or a hose that isn't connected. Vacuum leaks cause motors to shake and stumble on acceleration.
2) There's a plastic T connection on the back side of the engine behind and under the air cleaner box. That T connector joins together three air hoses of different sizes and is prone to breaking from heat stress. Only a Subaru dealer will have this part.
3) Even though the spark plug wires are new, you may have a bad one. Don't waste your money on cheap parts; they cost more in the long run.
Good luck!
SOURCE: need a diagram of the firing order of spark plug wires from coil packs to spark plugs
FROM LEFT TO RIGHT, 5/2 3/6 4/1. ASSUMING YOU HAVE THE 3.1L ENGINE.
SOURCE: mercedes c200 elegance 1996 model mis-firing on cylinders 1-4
I beleive your firing order is 1 3 4 2. 1 and 4 are companion cylinders-meaning the piston is up or down at the same time i.e. compression and exhaust stroke both pistons are up and even on the exhaust stroke the ignition fires in order to burn unburnt fuel/ h ve you checked your trigger. There is a good coil testing tool that is placed over the coil and has a magnetic pickup that allows you to see if the coil is being triggered-just because you have power doesn't mean that you will have spark. I would replace your ignition wires and look at your wiring harness very carefully- if it is very brittle and you see bare wires exposed that is your most likley problem because the trigger is working for 1 and 3 and has the crank senser input for all for spark plugs and the cam senser is used for ignition advance and your fuel injection system. try wiggling your harness and see if your coils start to work. wireharnesses are a major problem on mercedes benz vehicles of that era. I hope I have been helpful
SOURCE: Car is idling rough all coil packs have been changed along with spark plugs
the ecm fuel injector driver circuit could be the fault.have ecm checked out, it could be the problem dont buy new wires harness until you exhaust other possibilities.see ecm control injectors driver circuit.
SOURCE: 2003 mazda protege idles rough and shakes, almost stalls
What about new spark plugs and wires?
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