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From the timing belt to the transmission the fireing orders are 1234 One and three fired the same time 2 and 4 fire the same time. Pull all the plugs for the spark plug on them and lay them across the top of the motor with plugs in them you can see which ones fire at what time. The spark plugs need to be touching a grounded part of the engine to fire. This also will help you find out if you have bad wires.
try changing spark plugs from no1 cyl to no2 and no 3 to no 4, clean plugs before changing, run engine if plugs 1 & 3 are now wet they are not firing, you have determined by doing this, that plugs are ok, so the fault has got to lie either with plug leads or distributor cap
yes start with your plugs and then the wires to see if it is the wire pull the cylinder 4 wire off and swap with another plug if it changes to another cylinder misfire then you know its the plug wire. hope this helps and good luck let me know if ya need more..
First and foremost replace the timing belt, all of the Galant engines are interference engines meaning that if it fails you will sustain severe damage to the engine. If your at 90K miles your over by about 20K. Since your going to be in there go ahead and replace the water pump.
Also needing replacing, Serpentine belt, Spark plugs, Spark plug wires, anti-freeze, Transaxle fluid, Air filter, Radiator hoses.
If you have a 4 cyl most you can do most of this yourself at very little cost. Don't try the Timing belt unless your an above average do it yourself mechanic.
If its a 6 cyl I'd just have a shop do it all at the same time, the plugs and wires are a pain.
my money would be on the coil cover, especially if it had been a long time since the last tune up. it is certainly worth trying, as this is part of a routine tune up anyways. good luck!
First thing you can do to eliminate a possible cause is trade the coil packs between 1&4, and 2&3. Check again and if 1&4 are now dead, then you replace the bad coil pack.
You stated that the plugs were wet, but didn't say from what. What did the plugs smell like? Oil, fuel, or coolant?
Please let me know what was on those plugs, as there could be other causes as well.
You are mis fireing on cyl 1 and 3 if you replaced plugs and wires and coil this is going to be a fuel injector issue or valve issue. See if you can swap the injectors with known good cyl. and see if it changes. Or have a shop do a fuel injector service on it to see if it helps. It may be to late for the fuel injector service.
Matter not whether plug fires out of engine. Put it back in and clamp a timing ligh to it. If the light won't fire, you don't have enough spark to fire cylinder, hense miss.
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