I’ve been chasing this issue regarding to having a rough idle, which sometimes even backfires, and around 2-3.5k rpm, the car bogs. Could bad map sensor and 02 sensors be the culprit? I unplugged the map sensor then the idle somehow got better.

 

What check engine codes do you have?

 

Well, I actually don’t have any right now, only the P0108 when I unplugged the map sensor. I have had the engine light come on but I took it to the shop so I’m wondering if they cleared any stored or pending codes. They did a valve adjustment and said all my valves were tight but after they did it, it started running weird again. Also there’s a strong smell of gas.

 

Wow. I’ve been having very similar conditions. Also had valves adjusted, exhaust was partially tight. I also messed around with both o2 sensors. Last time I swapped the primary o2, the problem seemed to improve. However, today, back again.

no cel.

im having a hard time diagnosing. I’m probably going to drop it to my mechanic next week.

 

Is the catalyst clogged or broken?

Is your timing off by a tooth? Maybe someone turned the engine backwards when they did the valve adjustment and it slipped timing.

Try describing your issue with more detail, including when the problem started, what model year you have, modifications, etc

 

for me, when i first staring having the issue, i removed the cat and swapped in my test pipe thinking the cat was choking the system. That’s kind of what it felt like. After a 3 hr drive and a weekend of AX the issue continued to come on from time to time.

that was when i had the valves adjusted. And then started playing with the o2 sensors.

so far nothing I have done has solved the problem.

at first it mostly felt like it was happening in VTEC. But now, it will happen in any rpm.

feels like a fueling problem

 

From what I understand from your previous posts...you swapped in new O2 sensors and it cured it for a short period of time?

Did you reset the ECU by disconnecting the battery when you swapped sensors?

If so, try resetting the ECU again to see if that's a pattern.

These type of problems always have some sort of pattern. Find the pattern, find the issue.

 

I did not. I’ll give it a try

i thought the ECU would “re-learn” over a few miles after installing the new sensor.

 

I’ll give it a few more days but so far, the ecu reset had a positive effect. Felt good, been a while since the engine has felt like it was at full power.

i did a few rips up and down the gears and both VTEC and lower rpm range response felt good ( back to normal)

if this ends up being the fix, what does that mean? Should I try putting the old o2 sensor back in?

 

Nope, the issue will likely come back

The ECU reset was just a test to determine if doing a reset did anything.

I would put your original O2 sensor (or a new NTK/Denso direct fit) one back in regardless.

The Bosch sensor is prone to cause its own issues which will compound and make it increasingly difficult to diagnose.

We're totally jacking this thread...but OP is gone anyway. What are your symptoms again? And what circumstances led to them? Can you lay out the issues and attempted fixes in chronological order?