Question about Cars & Trucks
Posted by Anonymous on
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Posted on Jan 02, 2017
very unlikely to be fuel filter. misfires on petrol engines are usual down to the ignition system,possibly Plugs or leads if fitted. plugs should be replaced every 40,000 miles, not an expensive item either.
Posted on Feb 24, 2010
Testimonial: "Yep. You were right. Turned out to be two bad coil packs (#s 2 and 4 cylinders). Thanks."
Check the spark plug for that cylinder, the wire and coil. Also check for any vacuum leaks around that cylinder. See my "How To" on finding a vacuum leak.
Posted on Mar 13, 2010
Coils and plugs are not the only things that can cause misfires. Misfires can be caused by vacuum leaks, low compression, faulty fuel injectors, clogged EGR ports (on vehicles with individual ports for each cylinder), blown head gaskets, burned valves...you can spend a LOT of money on parts by just going in and replacing things without diagnosing WHY the cylinder is misfiring.
Posted on Feb 27, 2011
Could use some more data such as:
All the time?
Only when first starts?
Only when wet?
Did it start after after buying cheap gas or adding gas from an old gas can?
How long since last tune up?
I would suspect bad ign wire leaking high voltage or it is not getting to the spark plug OR a fouled plug. Sometimes you can hear the spark SNAPPING to ground or see it at night. Often you can get bad wires to show up by spraying them with a mist of water from an old spray bottle and uptting the car in gear with light acelleration. Make SURE to NOT stand in front of the car while somone is jazzing the gas!!!
Been a while since I have worked on a VW but most often it is plugs and wires.
Hope this helped,
Broken vaccume lines could also give you a skip and poor power in some situations.
Posted on Apr 30, 2012
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