So I have the issue with injen long tube cold air intakes that get wet with heavy weather and causes limp mode (I've ran into it at 4k RPMS before), but today I hit the dreaded limp mode that basically limited me to 2200 RPMS under any acceleration.

What is it that causes this? Is it the MAF sensor getting thrown off or is it liquid into the cylinders during detonation? Does this at all damage the MAF when it happens? I plan to get rid of the long tubes because I can't stand dealing with this in weather, but should I be cleaning my MAF as precaution as well?

 

The ECM will limit engine RPM to 2400 if it detects out of range values with the MAF. If this only happens during wet weather, it could be water vapour in the intake causing the MAF to indicate much higher air flow than there actually is.

If you can go back to stock, try that and see if it resolves the issue in wet weather.

 

I have had Takeda CAI for about a year and have driven through several crazy rainstorms and have never had a problem. Depending on which one you have there is a rain shield available.

 

Did you ever figure this out? I went through some heavy rain today with my 3" intakes and the car went into limp mode until i got home. I didnt try to gas it at all because i knew the filters were probably sucking the rain. Do you think my engine is still good after everything dries? Do i need to clean the mafs?

 

Probably some moisture on MAF's.

 

Clean the MAFs, will run fine when it dries back up. Dumb the CAI and get a supercharger or turbo—problem solved

 

So what was the end result?

 

i just waited til the next day to turn it on and took it to my tuner. He said the rain probably blocked airflow and messed with the ecu. He retuned it and it was normal after

 

What??? "the rain probably blocked airflow and messed with the ecu"
That doesn't make any sense! " blocked airflow"???

What does make sense is the water hit the MAF and cooled the hotwire and resulting in the MAF reporting a large increase in air flow, which is more than the ECU calculates (it always double checks EVERY sensor) and goes into limp mode since the reported air flow is wacked.

The issue is your intakes not being shielded from the weather.