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      11-17-2018, 09:15 PM   #1
ahmedn54
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Stumbling after spark plug change

Hey guys, this is my first post on the mechanical side of the forms. Im sorry if this is a repost but I haven't found any answers on any forms including this one, so sorry in advance!

I changed my spark plugs today after hearing what sounded like lifter tap but wasn't. Im starting the process of elimination and the first was my plugs. I bought the new spark plugs from fcp euro and bought Bosch OE Spark plugs: ZGR6STE2. Removed the spark plugs fine and replaced with the new ones with no issues. Torqued them down to 17 ft/pd and put the coils in as usual. Note: I found at the bottom of one of the coils that the rubber was torn about 180 degrees. After turning the car on, I heard no "lifter" tap so Hurray!! BUT, after driving a short distance I noticed my idle was sitting at about 720 rpm at a red light. Which is not normal considering its always been at 600 rpm at idle. Soon after realizing, I noticed that I felt what I thought was small misfires from under my seat and though the car. I can explain it to be something like small stumbles or as if the car was having tiny burps. I don't feel any loss of power under full throttle or even at moderate driving.

If anyone experienced this and has found a solution or if anyones read anything and can link me it I would greatly appreciate it!
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      11-17-2018, 09:41 PM   #2
arkie6
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Have you checked to see if any trouble codes are stored? If you are misfiring, you should have some codes stored even though the check engine light may not be on. These codes can point to exactly which cylinder is mis-firing. You can then swap coils and/or spark plugs between cylinders to see if the mis-fire condition moves with the coil or the spark plug. You could have a faulty new spark plug or your coil may be breaking down. Also, make sure the electrical connector on the coil is fully seated - don't just rely on the hinged cover on the coil connector to make sure the connection is fully seated, but actually push on the back of the plug to make sure it is bottomed out in the coil connector.
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      11-17-2018, 09:55 PM   #3
ahmedn54
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Originally Posted by arkie6 View Post
Have you checked to see if any trouble codes are stored? If you are misfiring, you should have some codes stored even though the check engine light may not be on. These codes can point to exactly which cylinder is mis-firing. You can then swap coils and/or spark plugs between cylinders to see if the mis-fire condition moves with the coil or the spark plug. You could have a faulty new spark plug or your coil may be breaking down. Also, make sure the electrical connector on the coil is fully seated - don't just rely on the hinged cover on the coil connector to make sure the connection is fully seated, but actually push on the back of the plug to make sure it is bottomed out in the coil connector.
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Originally Posted by arkie6 View Post
Have you checked to see if any trouble codes are stored? If you are misfiring, you should have some codes stored even though the check engine light may not be on. These codes can point to exactly which cylinder is mis-firing. You can then swap coils and/or spark plugs between cylinders to see if the mis-fire condition moves with the coil or the spark plug. You could have a faulty new spark plug or your coil may be breaking down. Also, make sure the electrical connector on the coil is fully seated - don't just rely on the hinged cover on the coil connector to make sure the connection is fully seated, but actually push on the back of the plug to make sure it is bottomed out in the coil connector.
I used the carly app to check for misfire codes or anything and I don't have anything!
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