March 21, 20233 yr Hello Everyone, This is not on a Subaru. I have a friend who drives a 2007 Suzuki SX4. While driving, he noticed a loud noise, flashing CEL, etc. I went over and took a look at it and found the coil pack blown apart, the terminal was blown out of the spark plug and sitting in the spark plug tube along with some coil pieces, the spark plug was loose and no longer threaded into the head, and the ground was cracked and smashed into the electrode. Once all of the pieces were removed from the spark plug tube, I removed the spark plug and saw that only the first couple threads were damaged (looked like maybe it was cross threaded and only turned a couple times). I saw no scarring on the piston head and no real sign of impact on the spark plug ground except for the fact that it was bent. There was also no thread material from the head on the spark plug and the threads on the head looked to be in good shape. I didn't have a tap with me to verify. There is no metallic sound when the car is running and the CEL was cylinder misfire 2, engine lean, and catalyst efficiency BS. All associated to the missing spark plug. My assumption is that the previous owner was an idiot and cross threaded the spark plug and it eventually gave up and was damaged from bouncing around. Could something else be going on? Or is this a simple fix of new plugs, boots and a coil pack?
March 22, 20233 yr New plug, boot, coil pack etc is worth a shot I’d say. What’s there to lose? If it doesn’t work it sounds like it’s time for a new head minimum, worst case is a replacement engine. It’s up the the owner - how much stuffing around vs how much coil they’re willing to mess around with to fix what’s potentially a simple issue. Cheers Bennie
March 22, 20233 yr Author 2 hours ago, el_freddo said: New plug, boot, coil pack etc is worth a shot I’d say. What’s there to lose? If it doesn’t work it sounds like it’s time for a new head minimum, worst case is a replacement engine. It’s up the the owner - how much stuffing around vs how much coil they’re willing to mess around with to fix what’s potentially a simple issue. Cheers Bennie That's the route we went. Anything more and they will.probably get rid of the car.
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