Spark Plug Help!!
#1
Spark Plug Help!!
Hey I just changed out my plugs for my 07 MC LS w/ 3.5 engine & the wires. I'm not sure what went wrong but the engine shaking really bad & my engine light flashes. I thought the wires were mixed up maybe but they're in correctly. Any suggestions on what may be wrong, besides go to a mechanic?
#7
Join Date: Apr 2010
Location: Mentor, Ohio
Posts: 12,156
If the problem happened directly AFTER changing the plugs, 90% odds a wire is damaged or a plug is damaged. Take the plug out of cylinder #3, since now you have the point of failure and inspect it. Look for if ithere is a crack in it, is the ceramic still properly attached to the metal, smell it for strong traces of gas. Also, inspect the wire, look for "burn" like marks (this could be a sign of arcing), look for any damage to the sheething. Inspect where the wire plugs into the coil, is the tip of the coil dirty, is the tip/tower of the coil damaged.
If everything checks out, reseat everything and see if simply reseating solves it.
I know a guy that battled this with cylinder #6 on a 3800 and found a bad plug.
Also, did you use BOSCH plugs? If so, my experience is, BOSCH plugs (not other BOSCH products, just plugs) suck. Switch to AC Delco (or I've had luck so far with the first set of NGK's I've used).
If everything checks out, reseat everything and see if simply reseating solves it.
I know a guy that battled this with cylinder #6 on a 3800 and found a bad plug.
Also, did you use BOSCH plugs? If so, my experience is, BOSCH plugs (not other BOSCH products, just plugs) suck. Switch to AC Delco (or I've had luck so far with the first set of NGK's I've used).
#8
X2 on plug brand. Acdelco is the best.
It has to be something you've changed or that you've done if it ran fine before. For only 1 cylinder to set a code the coils has to be working or 2 would miss fire. Like previously mentioned the coil post could be corroded or dirty or cracked. You can never verify a firing order and correct wire position too many times. i still mess them up occasionally maybe once a year.
It has to be something you've changed or that you've done if it ran fine before. For only 1 cylinder to set a code the coils has to be working or 2 would miss fire. Like previously mentioned the coil post could be corroded or dirty or cracked. You can never verify a firing order and correct wire position too many times. i still mess them up occasionally maybe once a year.
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