FL5 Emission and Rev-matching System Problem (P0011)

[mbaapk]

Im at 9,600 miles without any problem.
New parts will fix your issue. I will report back at 20,000.

6k w no issues

Sponsored

 

[TypeRD]

6k w no issues

That’s (more) great news! Thanks for the update.

Also, turns out I can get my car over to the dealership Friday. Fingers crossed it’s the procedural “We can’t find anything, so we cleared the CEL.” I’ll keep y’all updated.

 

[TypeRD]

Well…hmmm. Doesn’t look like I got the P0011 code, but the symptoms are the exact same as everyone else’s. The tech was a little frustrated he couldn’t find anything wrong after 2 hours of work. I need to get him a gift card or something. I’m a little concerned about the misfire detected. Hopefully it is just the ECU being sensitive (and learning) as someone else suggested or it’s something that is tied to the P0011 code? They cleared the codes, so I’ll just drive until the CEL comes back. It makes me a bit nervous though.

 

[Loulerg]

Hello! Had the CEL along with the emissions and rev match disabled alert today. I was in traffic heading to work, happened during an upshift, given the slow traffic I was able to just shut the car off and back on and the warning disappeared.

I had a 45 minute drive ahead of me and I made it a mission to give it the beans to see if I could make it do it again and nothing.

Will keep you guys posted to see what happens heading home.

 

[CTR]

Well…hmmm. Doesn’t look like I got the P0011 code, but the symptoms are the exact same as everyone else’s. The tech was a little frustrated he couldn’t find anything wrong after 2 hours of work. I need to get him a gift card or something. I’m a little concerned about the misfire detected. Hopefully it is just the ECU being sensitive (and learning) as someone else suggested or it’s something that is tied to the P0011 code? They cleared the codes, so I’ll just drive until the CEL comes back. It makes me a bit nervous though.

Did you let them know that you pulled the fuse on the exhaust valve?

 

[TypeRD]

Did you let them know that you pulled the fuse on the exhaust valve?

No. In fact I put my fuse back in before taking the car to the shop because I didn’t want them simply seeing the ECU’s exhaust valve error and blaming my “tampering” with the system as the absolute cause of the problem. You know that’s what they’d do is come to a quick cause and effect conclusion without doing a comprehensive test.

With that said, I think it is possible that having the valve always open (despite arguments one way or another) that could have caused the ECU to freak out that particular day under my particular conditions. Then again, it could be entirely unrelated.

I’ve driven another 700 miles (valve active / fuse installed) trouble-free. I haven’t reported further as I think I need more time and miles. So far so good. I’m keeping the valve active because I don’t feel there’s really enough benefit to warrant bypassing it…unless more soot in the center outlet is considered a benefit.

 

[CTR]

Maybe the random misfires are what some of us in the colder climates experienced when we pulled the valve fuse.

I know it's a hot topic on the forum right now but I think you made the right decision going back to stock. There is literally no benefit to pulling the fuse with all the potential downsides in drivability.

 

[TypeRD]

@CTR So far the misfire on startup seems entirely random. Note it was pretty warm and humid the day it happened, though I did drive the car about every chance I got back in March and April (when it was much cooler out). I had the fuse out / valve open during those months too. I got my car in mid Feb. It is garage kept, so cold starts are never truly that COLD. Central IL cold weather is really not all that extreme either, especially in comparison to the Dakotas. Not trying to rule out your hypothesis. Just adding details about my specific experience.

From my understanding, engines actually misfire all the time. But a misfire has to be “significant” for the ECU to flag it. For now I’m just going to chalk it up to being a new car with less than 3000 miles and sensors being a bit touchy. I’ll report back after more milage (unless the Christmas dashboard happens again sooner or if I get the P0011 code).

 

[TypeRD]

CEL again
Car is at about 2800 miles. This is ~1100 miles since the first time it happened.

Like the first time, it did it shortly after starting the car (while running errands and turning the car off a couple of times and back on the 3rd time is when it happened). The car is running fine. Like before, it gives me the same error messages that there’s a “problem with the exhaust system” and rev match is now disabled, brake system light is on, etc. etc. Going back to the dealership soon. Will report what they find.

 

[ChinoThaGod]

CEL again
Car is at about 2800 miles. This is ~1100 miles since the first time it happened.

Like the first time, it did it shortly after starting the car (while running errands and turning the car off a couple of times and back on the 3rd time is when it happened). The car is running fine. Like before, it gives me the same error messages that there’s a “problem with the exhaust system” and rev match is now disabled, brake system light is on, etc. etc. Going back to the dealership soon. Will report what they find.

Do you have any type of RFID transponder in the window? Like ezpass or something similar. This happened to me twice when I first got my fl5; once right after filling up for the first time and the other randomly about 3-5k miles later. Both times the dealership cleared but couldn't determine the cause... Thought maybe it was possible my ezpass could've caused the sensor above the rear view mirror to malfunction (seemed like a farfetched theory to me). About 11k miles now though and haven't ran into the issue since. Not sure if coincidence or what but something to think about if u do have any type of transponders.

 

[TypeRD]

@ChinoThaGod Thanks for chiming in. No. No transponders or anything like that.

The only coincidence I’ve found is it happened after making consecutive short trips. Drove about 10-15 mins. Turned car off. Drove another 10-15 mins. Turned car off. Upon starting the car the 3rd time, that’s when I got the CEL (both times). It makes me think there’s an occasional electrical problem, maybe a battery issue, or simply a sensor being overly sensitive. It could even be the P0011 code this time. It’s hard to say. I’ll report back after the dealership takes a look again.

I’m really not so much worried about it as I am annoyed. Like I said, the car is running totally fine despite this seemingly random glitch.

 

[TypeRD]

Well…like the first CEL, it was caused by a random cylinder misfire. Since this was the 2nd occurrence, they had to talk to Honda tech support about it. Upon further inspection, they found that almost ALL my valves were tighter than spec. Presumably they were like this from the factory. So they adjusted valves, cleared the CEL, tested, and gave it back to me. Only seat time will tell if this fixes the problem. Keeping my fingers crossed!

 

[tezzasaurusrex]

Well…like the first CEL, it was caused by a random cylinder misfire. Since this was the 2nd occurrence, they had to talk to Honda tech support about it. Upon further inspection, they found that almost ALL my valves were tighter than spec. Presumably they were like this from the factory. So they adjusted valves, cleared the CEL, tested, and gave it back to me. Only seat time will tell if this fixes the problem. Keeping my fingers crossed!

Interesting. I found my valves were all a fair bit looser than spec when I checked them at around 1500km (~930miles).
I assume you're always filling up with the highest quality fuel available? And fuel samples have been taken to check for water content/contamination etc? I would also check spark plug gaps if they haven't already been checked (really should have been done before doing the valves as plug gap checking is a far less time consuming job)

 

[PointByPatrol]

Could be as simple as an oil change. There will be metal particles released during break in, and the OCV's could have experienced a hiccough. Change oil and filter and try again.

 

[TypeRD]

@tezzasaurusrex No, I never use garbage fuel and never use octane below 91, as recommended (more like, required). And yes, I would expect loose valves with time and driving, but not tight valves. Even if the plugs are gapped correctly, this wouldn’t cause tight valves. The work was all done under warranty and I assume it was Honda Tech Support who told the technician to check the valves first. I think if the problem shows up again, they should definitely check the plugs (as well as the valves). Note : I think if the plugs are poorly gapped I would’ve encountered a CEL sooner and more often, given how sensitive the car is to significant misfires. Appreciate the input, though!

Sponsored