Bought some cheap spark plugs off a site, realized now they were fake (3 years later). Was cruising from Los Angeles to Santa Barbara for work and about 3/4 of the way there I got a misfire. Couldn’t stop so I limped to the job site (15 miles or so) and kept my rpm’s as low as I could. Left the job and car was still misfiring, limped it to Ventura (20 miles or so), pulled the codes at Oreily and found that I had random misfires and cylinder 5 misfires. Pulled plugs, electrodes were completely gone, worn to nothing. Replaced all plugs, reset ecu started car back up and drove around. Still got a misfire.

Swapped coil packs around (switched 5 to 3), reset ecu and drove around a bit got a misfire on cylinder 3. Limped it to Oxnard (20 miles) and got a new coil pack for cylinder 3. Got it in and boom, misfire gone. Drove back to Los Angeles (45 miles trouble free, but I did break the stupid black box that connects to the pcv from the drivers side air hose).

I decided to grab all new coil packs since 3 smelt burnt, spark plugs were all bad, figured the bad spark plugs were causing the coil packs to work harder than they should have and they were all on borrowed time, so I jumped on rockauto and ordered a full set of 6 NGK coil packs @ about 60 bucks a pop or so.

Got them all in, but couldn’t source the black box so I left the hoses disconnected and drove maybe a total of 200 miles with it as such. Car started running very rough after that point, got a CEL, and decided to fix it.

Hit up lowes and autozone, grabbed some 3/4” shark bite fittings and a heater hose from autozone to fit them, cut it down to size and made a makeshift connection between the air duct hose and the hose coming off the pcv.

Car idle now fixed, but still misfiring, pulled codes and realized cylinder 3 misfiring again. All new plugs and all new coils. I had an extra coil pack, but no additional spark plugs, so I swapped the plugs between 1 and 3, put the coil pack from 1 onto 3, and put a new coil pack on 1 altogether.

Misfire gone, but car does seem to lack power possibly. Weirdest thing, it gets up and goes but I still feel like something is off. I’m wondering if driving on new plugs with ruined coils and misfiring damaged my plugs. I’m also wondering if my coil packs were legit at this point.

im going to drop the oil as perhaps my oil has been tainted with gas from misfires. Any thoughts or ideas? I’m waiting to see if a misfire develops on cylinder 1 now following the spark plug.

 

how do the new spark plugs look in the misfiring cylinders? Is there any oil or anything when you stick a shop towel down the hole?

Hows the oil look via the dipstick/whenever you drained it?

Burning any weird colors out the tailpipe? i.e blue