Re: 98 vw beetle misfiring after rain. New plugs, coil...
Yes, this will allow for the energy being generated to the plugs to release onto anything close enough to give it a ground. I found a website that said to remove it and coat it with liquid steel 2 part epoxy. I did that on m y '98 Beetle and worked very well for about another year. These coil packs are a POS and VW knows it, but will do nothing to resolve the issue. I did see where they recalled all 2001 & 2002 VW's to replace them, but did nothing to acknowledge the previous years, which are of the same caliber.
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The coils in these cars are very susceptible to moisture causing poor engine running conditions, misfires and no start. They also tend to crack. This can be verified with a spray bottle full of water. Simply spray the coil, and ignition wires once you've gotten the engine running if it stalls, arks, misfires idle changes... Replaced the coil and/or ignition wires. Good luck.
The timing needs to be adjusted via the ECU unit which can only be accessed with a VAGCOM.. its a programming computer used for VW engines that is not a standard engine computer. You can find home mechanics that have VAGCOM units that may help you out in your area by going to TDICLUB.COM. This is a VW Diesel site, but the VAGCOM is used for both and there is a list there with city and states of people who have home version (software and computer) You will find most of them like me are more than willing to share and help. You also didnt mention the mileage and last time you replaced the timing belt. The VW belts are only good for 60k miles and have to be replaced or else they stretch and slip, or worse break causing misfire, no start, etc.
You must have bad ignition wires. The high voltage electricity must be leaking out of the boot(s) and arching from the moist air surrounding the coil pack. Use a spray bottle filled with tap water. Set the nozzle to mist and not stream, you want to have a misting effect. With the engine running, spray at the area of the spark plugs, wires and coil pack. Do this in a dark area so you can easily see if any arching is produced. Observe while spraying water if the engine starts to run rough. If it does you definitely have an electrical leak and need to repair or replace that part. Some people apply JB Weld epoxy to a cracked ignition coil pack housing, I would just replace the coil because it can cause misfiring of a cylinder and ruin your catalytic converter. For a 2.0 AEG engine it would cost about $70 for the part. If it were the ignition wires, they usually cost the same price.
It could be the coil, or the ignition module where there coils sit on. Start with the simple and check the spark plug wire first, then work your way to the coils and module. Once you work your way to the coils, try switching the coils around and see if the misfire will switch cylinders which would indicate a bad coil. If the same cylinders are still misfiring after the coils have been switch, then it's a good chance that's it's going to be the wire harness to the ignition module or the module it self. Good luck and hope this helps.
Certainly the person telling you this had a scan tool but did not investigate thoroughly why it was misfiring and only suggested a bad plug in cyl #4. A bad plug is usually the case maybe from a mixed matched set of plugs. Having a distributor-less system some people miss to check the ignition coil pack. Technically you can't correct a problem by resetting it's warning indicator which some people think they have a red FIX button. In this case the engine management needed 3 start up cycles to verify if problem was fixed after erasing the DTC stored in the system, hence the 3 days. The ignition coil pack could be going bad or the individual ignition wire is. Is this an AEG engine code?
this car has what is called coil over ignition which means no plug wires or cap so if it is missing swap coil from cyl 2 and any other cyl then clear code and rerun car till light comes back on then check code if it is still cyl 2 missfire then replace that plug if code changes to the cylinder that 2's coil was on then replace that coil <that car does have a recall for coils> if car is not missing and you have that code most likely isnt an ignition problem but will have a small vaccume leak so check the small hoses for leaks. very common for fuel preasure regulater vaccume hose to brake from age
Hi, Yes it certainly could be especially if water gets in. You should also check the distributor cap. The misfire sounds like an arcing problem so it would have to be one of those two things since you changed the rest. Good Luck!