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Spark Plugs and Wires

Why would your truck vibrate and idle rough after you changed the spark plugs?


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2005-12-11 17:07:49
2005-12-11 17:07:49

Possible wires installed wrong or plugs not gapped properly. You don't say what kind of car so I cant tell you the firing order. Check you put the right wires on right plugs. ALSO- If you have a timing light or access to one- Check timing! If it was timed/tuned with old plugs for several years (it happens, my smog guy does it to pass me), then it might have been changed to accomodate the old plugs wearing down. Plus a hotter burn/spark will automatically change your compression and therefore your whole burn sequence. I put in 'fancy' platinum plugs in my Bronco once and it refused them, running terrible. Had to put in new 'old' type plugs and ran perfect. Go figure. Dokter Denney

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the transmition ,is probably not adjusted to the spark plugs,or their not the right spark plugs

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Yes. Bad spark plugs, bad spark plug wires and a bad distributor cap are the common causes of rough idling. If it has been a while since you changed these components, do so.

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as a result of bad spark plugs

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Maybe when they put the spark plugs in they were not gapped right or they maybe the wrong spark plugs.

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Old spark plugs can make a car misfire, run rough, and not fire at all.


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