BlueStang16
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- Thread starter
- #1
I own a '16 GT, so it is the Gen2 Coyote. P0306 and 308 codes thrown a couple months ago. I've got 110k miles on the clock. I did spark plug swaps at 88k with Bosch Double Iridiums. Cleared out the codes fine. A few weeks ago, same codes. Replaced the ignition coils on all eight, checked the plugs for burn and char - nothing out of the ordinary. Put it all back together but the codes remained, however it was purring like a kitten. So I bought new ignition coils. No change, same codes. Swapped the coils 6 and 8 for 2 and 4. P0306 was gone, but 0308 remained, and P0300 code thrown. But no driving issues.
Then in the last 10 days, it would backfire shifting between 2nd, 3rd, and 4th. Driving to work one morning this week the check engine light started flashing, then went solid. I turned around and got back home. Put it in the shop for 4 days. They pulled the same codes, ran their diagnostics, swapped out spark plugs for OEM Motorcraft ones I bought (just checking all the boxes), cleared the codes and drove the car around.
They called me saying they couldn't detect any more issues, no codes being thrown, and asked around when the engine light would come back on, as it has been doing that for a few weeks. I asked them to drive it past 100 miles on the clock to try and replicate my issues. They drove it for 3 days with no codes, no lights, and no backfires, draining a half tank of gas. I asked about the IMRC, vacuum leaks, and the fuel injectors. They ruled them all out. They said the cylinders are good, too. So I went to pick it up. Yup, purring like a kitten and powerful again.
I've had the car back about half a day. Drove it all day today. No issues. Been out for 12 or 13 hours doing errands. On the drive home tonight, check engine light came on solid, but no issues until I got off the freeway and had to start shifting. A couple of pops going up from a stop at 2nd and 4th, but nothing like before. Got home and plugged in my reader and sure as heck, P0300 and P0308. WTH?
I am stumped. Anybody go through a similar thing? I'm looking for the root cause and solution(s). Or should I cash out my chips and get rid of this car as I have already dumped more $ into it in 2 years than I have with any other car. I love my 'Stang, but it is teeing me off. Thanks in advance.
Then in the last 10 days, it would backfire shifting between 2nd, 3rd, and 4th. Driving to work one morning this week the check engine light started flashing, then went solid. I turned around and got back home. Put it in the shop for 4 days. They pulled the same codes, ran their diagnostics, swapped out spark plugs for OEM Motorcraft ones I bought (just checking all the boxes), cleared the codes and drove the car around.
They called me saying they couldn't detect any more issues, no codes being thrown, and asked around when the engine light would come back on, as it has been doing that for a few weeks. I asked them to drive it past 100 miles on the clock to try and replicate my issues. They drove it for 3 days with no codes, no lights, and no backfires, draining a half tank of gas. I asked about the IMRC, vacuum leaks, and the fuel injectors. They ruled them all out. They said the cylinders are good, too. So I went to pick it up. Yup, purring like a kitten and powerful again.
I've had the car back about half a day. Drove it all day today. No issues. Been out for 12 or 13 hours doing errands. On the drive home tonight, check engine light came on solid, but no issues until I got off the freeway and had to start shifting. A couple of pops going up from a stop at 2nd and 4th, but nothing like before. Got home and plugged in my reader and sure as heck, P0300 and P0308. WTH?
I am stumped. Anybody go through a similar thing? I'm looking for the root cause and solution(s). Or should I cash out my chips and get rid of this car as I have already dumped more $ into it in 2 years than I have with any other car. I love my 'Stang, but it is teeing me off. Thanks in advance.
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