Can the Subaru Forester 2.5 litre engine misfire from moisture? It wouldn't fire on all four cylinders, after freezing weather turned to winter rains, and I suspect moisture is grounding something in the firing circuitry. The ''Check Engine'' lit and blinked shortly after starting, which is reassuring that it knows its sick, yet I've found no ''readers'' on Saltspring Island to read this code. Any histories out there? or theories? Thanks. Valdy
You MUST read the fault codes to discover what cylinder is misfiring. Why not buy a cheap fault code reader. Here is one such reader. New OBD2 II EOBD Car Diagnostic Code Reader Live Data
SOURCE: 1998 subaru forester runs rough when it rains.
Check the cap and rotor for internal carbon tracking or, just change them. Also, take a look at the coil when its dark and rainy and see if there is any arcing where the coil wire goes into it.
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: EGR Flow Malfunction, and sometimes a Cylinder 4 Misfire.
How does the oil look? Is it milky or is there any discoloration? Is any moisture or steam vapor coming out of the exhaust pipe? The EGR fault is most likely being triggered from the cylinder missfire. Sounds like you might have a head gasket blown, and/or a cracked or warped cylinder head from the overheating.
You can run a compression test to help determine this.
Good luck...i hope this helps you troubleshoot the problem.
SOURCE: check engine light subaru forester 03
try ebay or used i would just replace the one downstream one frist
Open the assembly and dry it. I would do so in full sun on a
in low humidity and add a clear silicone sealant around the wire connection
harness and around the rim of the light cover. The one around the light cover
should be thin. If it is still happening, dry it again and place a small amount
of baking soda in the assembly. It will settle to the lowest point and should
absorb moisture.
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