Thursday, September 15, 2011

My truck is misfiring after changing spark plugs?

My truck is misfiring, I replaced 4 of the 6 spark plugs, the old plugs were Platinum and the new ones are double Platinum. The reason I only replaced 4 is because it was getting too dark. I will do the other 2 tomorrow.



2004 Frontier SuperCharged.



Other info 2004 Supercharged frontier,
My truck is misfiring after changing spark plugs?
chances are that if you didn't have the mis fire before you started then you must recheck your work. a way to find which cylinder is misfiring would be to pull each wire off one at a time while the engine is running and when the misfire go's away then that cylinder is the one with the misfire. remember to use a rubber coated pliers so you dont get jolted. also be carefull to not damage the spark plug wires . it is possible that you packed some debris on one of the spark plugs during installation since you were working in the dark. it is also possible that you cracked a spark plug insulator upon tightening the plug and last if the misfire is consistant then it is possible that you put a wire on the wrong . hope this helps
My truck is misfiring after changing spark plugs?
One time I was changing my plugs and didn't notice but when when installing one of the plugs i barely chipped the ceramic and it caused mine to misfire. It doesn't take much I was being very careful. Not saying that's your problem. Your problem is probably the fact that the new plugs are igniting a lot more than the old two and causing problems, install the others and you should be fine IMO.
Done the wires too? It may be one of the two you haven't changed as well.

Could be the ignition coils, could be a faulty sensor, could be a tetchy computer.

Could be lots of things, I'd suggest you finish the plugs and wires and go from there.
Make sure you got the wires on the right plugs and that they are tight, if that's OK then you cracked one of the plugs putting them in.
i think u have wrongly connected the coil wires to spark plug..try looking where u have gone wrong or get a mechanic He ll fix it in a minute..
You crossed plug wires you put them on the wrong plugs. Get a flash light. lol