[SSRACCORD]

Help please!
I love my accord but recently it’s cursed.
2 weeks ago went into limp mode, all warning lights come on.
Emmisions system problem avoid hard exceluration and high speeds.
Codes misfire on 1 and 4
I replaced plugs and coils,
cleaned PVC and mass airflow sensor
changed oil. Still going into limp mode at least 3 times per day. But isn’t leaving codes. It’s very random, seems like 2,200RPM is when it happens.

any thoughts?

 

[Fired00d]

Look at this thread - 2018 Honda Accord Sport "limp mode?" it might provide some insight into your situation.

 

[SSRACCORD]

Checked plug at pedal, all good. Just cleanEd the MAP sensor as well.
At this point I’m dropping it of at the Honda dealership this week. Hopefully they check injectors , vacuum leaks etc.

 

[SSRACCORD]

It was getting 35 to 40 mpg now it’s getting 25mpg

 

[Fired00d]

The final outcome of the thread I referenced was...

Honda says it's the ECM and they're replacing it under warranty. What a relief.

That item is covered under the Powertrain Warranty (copy of that warranty can be seen attached to this post).

 

[Vegashybrid]

Seeming to be a bad batch of ECM in the 2018 model

 

[SSRACCORD]

So I tried one last thing before I take it to dealer. Cleaned both MAP sensors one on the intake and the one on the inlet tube before the intake.
Car seems to have its pop back, no limp mode, I drove it for about an hour putting it through different hard pulls starts and stops. Fingers crossed. I’m thinking these Turbo Honda’s are very sensitive when it comes to rich or lean mixture. As well as diluted oil blow by passing through the PVC valve and contaminating the MAP sensor. I am definitely installing a Oil Catch can. So my theory is diluted oil, contaminated the MAP sensor, then fouled my plugs. Eventually causing misfires.
My advise… change oil earlier, and clean MAP sensors and PVC each oil change. As well as install catch can. I’m really hoping this thing is fixed it’s been driving me crazy.
The MAP sensor tells the ECM how much intake pressure there is, and the ECM tells the fuel injectors how much fuel to spray.
Hope this helps anyone with misfire issues.

 

[SSRACCORD]

One thing I will add, maybe design flaw. The valve cover breather hose enters the intake directly beside the MAP sensor, literally an inch away if that… just saying…