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Car runs fine in dry-hot or cold-weather. But in damp weather it misses real bad. I replace the spark plug wires with new ones but the problem still persists. Any suggestions as to what I should do next?
Replace the coil with a Honda coil. never buy after-market ignition parts with Honda's always buy genuine Honda parts. not only will it work better...but its actually cheaper in some cases..plus they have a much better warranty than most auto parts stores. this rule applies to Honda's and Toyota's Ignition system parts. I had similar issues with my old 1989 Honda accord. As an added measure apply "Di-Electric Grease" into all spark plug wire boots to help seal out any moisture (both plug ends and distributor ends). hope this helps.
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cylinder 1 getting too hot causing ceremic crack could have wrong heat range plug in which spark plug too hot.or need replace spark plug wires.one plug wire could be bad best replace all spark plug wires.
I have a Jetta 2.0L MK4 and had this problem as well. I believe the engines and ignition system are similar or equivalent. The key word you stated is "damp" weather. So, in damp weather the surfaces of almost everything in the engine compartment has a microscopic coating of water on it. Also, almost every man-made material absorbs some water. So, in damp weather the plug wires and coil pack can have a microscopic film of water and/or will absorb some moisture in their insulating materials. Any micro cracks or internal carbon tracks in the insulation can offer a path of least resistance in this moist environment. This can cause the high voltage to find a partial short-circuit path or a complete short-circuit path to ground before reaching the plugs, hence causing misfiring. The heat of the engine will dry out the moisture and make the problem go away temporarily. So, to troubleshoot the problem do the following: At night and in the dark, and with the car engine just started in damp weather, look for arcing. If arcing is observed you found the problem! It not, let the heat of the engine dry out the ignition system and allow the engine to run smoothly. (Temporarily close the hood to hasten this process) Use a spray water bottle with ordinary tap water (not distilled water) to lightly spray the wires and coil pack so that you can look for arcing. DO NOT TOUCH THE CAR WHILE SPRAYING! Spray in an orderly manner to try to pinpoint the problem. It is possible that you may not see the arcing but the engine may misfire when sprayed. This usually finds an issue with a weaken insulation system. If not, I have seen on this same Jetta a weak coil pack output on 1 of 4 coil outputs causing an intermittent misfiring, more so in damp weather. In this case use an in-line neon plug tester to look at the neon "glow" on each plug wire to see if any of the coil outputs are weaker than the rest. I had to replace the coil pack in this instance and it resolved the problem. I hope this information helps!
The small wires on the altenator could be broken. The insulation will still be intact. Try to stretch the wires but dont pull them out of the connector. If one stretches, the wire inside is broken. Splice it and it should fix it. It supplies the feul pump when the engine is running. If it is fractured, then not enough power goes to the pump. If no wires are bad, try replacing the air intake sensor. It is right by the mass air and is round with two wires and just pulls out.
It sounds like the weather is affecting your spark plugs. This is very strange. You may want to try to replace the plugs completely. If it sounds like it is running out of gas, the fuel is not being ignitied properly. By the way, I own a 2001 s10.
this i would say is a fuel supply problem as when you spray ether into the intake it runs until it has burnt it all(replacing the gas ).it could be that the dampness is affecting the fuel pump system at a connection or the pump relay under the hood or a wire worn through somewhere.the distributor tells the computer that the car is running and to keep the fuel pump running through a signal supplied by the pickup coil in the distributor to the thick film module mounted on the side of the distributer(grey in colour)with about 5 wires in the plug connector out to the computer.either of these could also be the problem.you can still have spark but no fuel if there is a signal problem.the most common problem is the thick film module.
Check to see if your spark plug wires are not cracked or worn. They would make the engine run rough when cold or damp more often then when the engine drys up when warmed up- just an easy thing to check...
perhaps you need a new cap and roter a new spark plug wire set. they don;t like moisture. also check to see if you have any broken or leaking vacuum hoses. the worse case senerio would be that your head gasket is leaking--at cold temps a little antifreeze will enter until everything warms up and it seals shut due to metal expanding. but since you say it's cold weather only--this probably wou;dn't be the case. good luck.
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