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I replaced my plug wires and now it has 2 cylinder misfires

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Sounds like those 2 wires are swapped

Posted on May 20, 2011

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Kenferr0427, While you don't mention what your vehicle has, distributer or distributerless ignition, you may have crossed two of the wires. However, when you put the wires on did you seat them properly? You should hear and feel a click when the wires is properly seated on the plug and the coil or distributer. If you have distributerless ignition, you can check on the coil pack to see which coil (they are numbered) is for which cylinder and then go from there. Good luck with this.

Posted on May 21, 2011

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Check and make sure you have the wires in the correct order. sounds like you have two of the wires on the wrong cylinder..

Posted on May 20, 2011

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Posted on Jan 02, 2017

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SOURCE: 1998 chevrolet k1500 pickup 305 a misfire in # 2 cylinder

hi there, if you can feel the misfire at an idle but not at a higher rpm than the fuel pressure regulator is bad im working on one right now that has mifire code and random misfire codes coming up

Posted on Aug 28, 2008

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SOURCE: Took my car to have check engine light checked. It

In modern cars so much can go wrong to indicate an issue and a computer in the car can get confused as to what is really occurring. In most cars a misfire indicates either an incorrect firing order, shorted wires, bad plugs, or bad coil. Since you have replaced the wires and plugs we can rule those out. Im also assuming after the second engine code you pulled #2 plug and made sure it wasnt fouled with oil, was gapped correctly, and reinserted. To produce a sufficient spark for combustion the alternator sends power to a "Coil" which is in reality a storage point that then sends an amplified electrical current down the spark plug wire to the cylinder to fire the plug. If the car is truly misfiring you will notice a rough idle, fluctuating RPM's, and lack of acceleration. If you are experiencing any of these I would look at replacing the coil. If you arent experiencing any of these I would have the code cleared again and complete one drive cycle 100 miles and then have codes read again. If you still get a Misfire error some other causes known to occur with Rio's are fuel filter issues, gas caps, and fuel injector issues. Although rare, these can cause issues with the cars fuel delivery and emissions which can confuse the sensor in the ECU. I would try injector cleaner, replace the fuel filter, and gas cap . If funds are an issue then based on symptoms I would start with injector cleaner first $3, Filter $12, Gas cap $12, Coil $48 to $200+

Posted on Jun 06, 2010

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SOURCE: Code P0302 Cylinder 2 misfire detected

Also, Takeout #1(from front of the car on your left) and #2 and compare two plugs.
perheps #2 sparkplug is white(at contact point), Than you are in deep troble(head gasket problem, white smoke comes out of tailpipe) like I have.

Posted on Nov 03, 2012

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