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Daer friend:please check the following items in order to illiminate problem,compression test cyl 1,spark plug,plug lead,and coil pack,if not have ECU checked out
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The vehicle is nearly 16 years old now, so it is quite likely overdue for a major tune-up (including plugs, wires, and coil packs).
Beyond that, verify adequate pressure at the fuel rail, and replace the fuel pressure regulator and/or fuel pump as required. If fuel pressure is adequate at all load ranges, suspect fuel contamination (especially if you have been using ethanol blend fuels over the past few years). Replace all fuel in the vehicle with fresh in this case, and that should solve your problem.
I would remove one plug at a time, plug it back in wire and lay on top of engine block. Have some one crank and look for spark. Do this for each plug. If 1 is missing. You have bad wire. If two sparks are missing, then you have bad coil pack, if 3 is missing, you have two bad packs or bad module, if all cylinders are missing, then module or cranks sensor is faulty. Dont forge to change those plug wires just as often as plugs. They may look good still, but they get weak
I recently starting having this problem also (only code p0305/308). That code means "miss-fire" on #2 cylinder. The #2 cylinder is the nearest cylinder on the right (closest to front of car on drivers side) if you are standing in the front of the car.
Do you have the "firing order" correct? In other words, is each spark plug wire going to the same cylinder it was on before you changed the plugs? If you have done nothing else but changed the plugs then this is the most likely problem.
If when you try to start the car it backfires through the exhaust or backfires through the intake. Then this " IS" the problem. Good luck.
Problem could be as simple as a vacuum leak around either of those cylinders. A vacuum leak can create a lean fuel mixure condition resulting in a miss fire. One thing to rememeber is that depending on the style of ignition in use. The opposing cylinder's spark plug and wires act as the return path for the unused voltage from the coils firing which is why you are having seemingly unrelated misfires. If either has a problem then the symptoms are shown in both cylinders.
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