Good afternoon everyone!
I've started getting a misfire on Cyl-2 on my Fusion. This started abruptly approximately 8-9 days ago. Here are the details:
I use Torque Pro with a bluetooth OBD-II adapter to get engine data.
- The car is still driveable. I still am able to drive it the 110 miles, round trip, to work, about 90-95% of which is highway.
- When the engine is cool, especially when idling, I get the highest misfire percentage. Latest numbers are somewhere around 200-300 misfires in a 5-10 minute drive after the car has been sitting overnight or during a workday.
- On the drive either to or from work, over an approximately 60-90 minute drive (~95%), misfire count reaches between 250 and 350.
- Catalytic converter temperatures do seem somewhat elevated, especially under acceleration.
- Fuel economy does not seem to have dropped a lot. Maybe 5% at most.
- There is no oil in the coolant, and the oil is fairly dark but clear and not in any way cloudy or milky. (~6000 miles on the oil).
- The car drives fine, even with A/C on, at cruising speeds around 70-75MPH.. just a few misfires, roughly in the range of 5-15 per refresh cycle (approximately 4 mins)
.. with the exception of noticeable but fairly minor shudder around 60-65MPH, in the 1600-1800 RPM range under load.
- UOAs have indicated essentially no fuel dilution
I had the car in at the dealership for my airbag recall, and asked them to have a mechanic run a diagnostic to see if he can pinpoint the issue. The service writer called me about 30 minutes ago and told me that the mechanic noted that there was no compression in cylinder 2.
Now, I'm not a professional mechanic, but it seems to me that if there were NO compression in cylinder 2, my misfire counts would be off the charts for that cylinder, and over the course of a 60-90 minute drive home, would be MUCH higher than 250-350. I brought this up to her and asked if the mechanic had even, or could run dry/wet compression tests on the cylinder, as well as a pressure test on it with the piston TDC. She said she would check and call me back.
............
So.. here's where I ask for input.
1 - Based on the above information, would you say that a diagnosis of "No compression" is even remotely accurate, or would you say it's more likely to be "low compression"
2 - Do you have any thoughts as to what the issue could actually be? My gut says that it is not the rings, since ring wear should come on as a more gradual change, and not a sudden increase in misfires along with a sudden drop in compression.
3 - What would your next steps be?
4 - Any additional thoughts?
I've started getting a misfire on Cyl-2 on my Fusion. This started abruptly approximately 8-9 days ago. Here are the details:
I use Torque Pro with a bluetooth OBD-II adapter to get engine data.
- The car is still driveable. I still am able to drive it the 110 miles, round trip, to work, about 90-95% of which is highway.
- When the engine is cool, especially when idling, I get the highest misfire percentage. Latest numbers are somewhere around 200-300 misfires in a 5-10 minute drive after the car has been sitting overnight or during a workday.
- On the drive either to or from work, over an approximately 60-90 minute drive (~95%), misfire count reaches between 250 and 350.
- Catalytic converter temperatures do seem somewhat elevated, especially under acceleration.
- Fuel economy does not seem to have dropped a lot. Maybe 5% at most.
- There is no oil in the coolant, and the oil is fairly dark but clear and not in any way cloudy or milky. (~6000 miles on the oil).
- The car drives fine, even with A/C on, at cruising speeds around 70-75MPH.. just a few misfires, roughly in the range of 5-15 per refresh cycle (approximately 4 mins)
.. with the exception of noticeable but fairly minor shudder around 60-65MPH, in the 1600-1800 RPM range under load.
- UOAs have indicated essentially no fuel dilution
I had the car in at the dealership for my airbag recall, and asked them to have a mechanic run a diagnostic to see if he can pinpoint the issue. The service writer called me about 30 minutes ago and told me that the mechanic noted that there was no compression in cylinder 2.
Now, I'm not a professional mechanic, but it seems to me that if there were NO compression in cylinder 2, my misfire counts would be off the charts for that cylinder, and over the course of a 60-90 minute drive home, would be MUCH higher than 250-350. I brought this up to her and asked if the mechanic had even, or could run dry/wet compression tests on the cylinder, as well as a pressure test on it with the piston TDC. She said she would check and call me back.
............
So.. here's where I ask for input.
1 - Based on the above information, would you say that a diagnosis of "No compression" is even remotely accurate, or would you say it's more likely to be "low compression"
2 - Do you have any thoughts as to what the issue could actually be? My gut says that it is not the rings, since ring wear should come on as a more gradual change, and not a sudden increase in misfires along with a sudden drop in compression.
3 - What would your next steps be?
4 - Any additional thoughts?
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