CEL and driving in Rain...please help

nalinc23 · 08-22-2007, 07:15 PM

Since i've owned my 06 SI Coupe the check engine light has come on twice, only staying on for a full day or so afterwards. Today it happened again and I finally noticed a pattern here...

It goes on only when I'm driving home from work in heavy rain. The performance, idle, behavior, etc is 100% perfect, no issues for driveability, just annoying. Does anyone have any ideas what could be causing this? I haven't been able to get the CEL code run because it doesn't stay on long enough.

Thanks!

***CaliGuy*** · 08-22-2007, 07:21 PM

What mods do you have?

nalinc23 · 08-22-2007, 07:29 PM

Oh sorry, only mods are Neuspeed SS, Corsport Bushings, and AEM Short Ram intake (not cold air)

***CaliGuy*** · 08-22-2007, 07:36 PM

The only think I can think is that somehow the water is messing with your O2 sensor...I'm no expert though...

Civic Pride · 08-22-2007, 07:45 PM

try to reinstall your shortram intake again, that the only think i can think of causing the cell. make sure ther are no air leaks or anything like that.

nalinc23 · 08-22-2007, 07:55 PM

but that wouldn't explain why it only happens when it rains out right??

nalinc23 · 08-22-2007, 09:44 PM

anyone else have any ideas?

bioevolve · 08-22-2007, 11:59 PM

Humidity from the rain getting past your filter and collecting dew on the MAF sensor, then dries off after awhile and cell goes away.
Or
Exhaust opening up before the O2 sensor/sensors when water hits the exhaust and giving the sensor/sensors a lower reading than the normal range. Then exhaust seals back up at optimal temps and give the sensor/sensors proper readings.

Just a daily thought.

Hook up an OBDII code reader to it and read the stored codes and let us know.

MonkeyConQueso · 08-23-2007, 01:44 PM

Quote:

Originally Posted by bioevolve

<snip!>

Hook up an OBDII code reader to it and read the stored codes and let us know.

Yep, just cruise by Autozone, Schucks, whatever and borrow their ODBII reader for free. Takes 2 minutes, and will give us more info

nalinc23 · 10-05-2007, 07:21 AM

My CEL came on AGAIN during the rain, while i was fueling up so I decided to get the code read once and for all....turns out the code is

"System running too rich (bank 1)"

Possibly when it rains and is humid my MAF is messing up?? The car feels 100% normal, no loss of power or whatnot...anyone else have any ideas what this could be?

shutter13 · 10-05-2007, 08:59 AM

Quote:

Originally Posted by nalinc23

My CEL came on AGAIN during the rain, while i was fueling up so I decided to get the code read once and for all....turns out the code is

"System running too rich (bank 1)"

Possibly when it rains and is humid my MAF is messing up?? The car feels 100% normal, no loss of power or whatnot...anyone else have any ideas what this could be?

its possible like another poster said, the humidity could gather on the MAF and cause it to throw a CEL... same thing would happen if your filter was over oiled

if its not a MAF sensor problem (which idk, because the scanner would have read the code as a MAF problem) i assume its something with your 02 sensor in which your dealer would probably have to fix or diagnose... but then you might get crap for having the intake...but its not necessarily the intake that caused the light

mrbill · 10-05-2007, 01:46 PM

Any other codes together with P0172?
Look for codes associated with MAF, Primary and/or secondary A/F sensor, VTEC system, EGR and EVAP.

No?
Check fuel pressure too high.
No?
Check for vacuum leaks, particularly check:
PCV valve, PCV hose, EVAP purge valve, Throttle Body, Intake Manifold, Brake booster and hose, AIR INTAKE DUCT
OK?
Check 4,500 RPM warm MAF sensor reading.
Between 14-20 gm/sec? Check engine valve clearance, if OK, replace injectors.
Outside 14-20 gm/sec? REPLACE MAF sensor/IAT sensor.

-mr. bill

08-22-2007, 07:15 PM	#1 (permalink)
nalinc23 Senior Member Join Date: Jun 2007 Location: Savannah, GA Age: 26 Posts: 221 Nate iTrader: 0 / 0%	CEL and driving in Rain...please help Since i've owned my 06 SI Coupe the check engine light has come on twice, only staying on for a full day or so afterwards. Today it happened again and I finally noticed a pattern here... It goes on only when I'm driving home from work in heavy rain. The performance, idle, behavior, etc is 100% perfect, no issues for driveability, just annoying. Does anyone have any ideas what could be causing this? I haven't been able to get the CEL code run because it doesn't stay on long enough. Thanks!

08-22-2007, 07:21 PM	#2 (permalink)
*CaliGuy* VIP Member Join Date: May 2006 Location: SoCal Age: 30 Posts: 10,520 J. M. back by popular demand! iTrader: 4 / 100%	What mods do you have? __________________ Visit my city! Free vagin for every resident (in direct contrast to the other cities that only provide free Fleshlites!) http://eat-mykhram.myminicity.com/

08-22-2007, 07:36 PM	#4 (permalink)
*CaliGuy* VIP Member Join Date: May 2006 Location: SoCal Age: 30 Posts: 10,520 J. M. back by popular demand! iTrader: 4 / 100%	The only think I can think is that somehow the water is messing with your O2 sensor...I'm no expert though... __________________ Visit my city! Free vagin for every resident (in direct contrast to the other cities that only provide free Fleshlites!) http://eat-mykhram.myminicity.com/

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08-22-2007, 07:29 PM	#3 (permalink)
nalinc23 Senior Member Join Date: Jun 2007 Location: Savannah, GA Age: 26 Posts: 221 Nate iTrader: 0 / 0%	Oh sorry, only mods are Neuspeed SS, Corsport Bushings, and AEM Short Ram intake (not cold air)

08-22-2007, 07:45 PM	#5 (permalink)
Civic Pride Senior Member Join Date: Mar 2006 Location: Brownsville,TN Age: 22 Posts: 4,222 iTrader: 5 / 100%	try to reinstall your shortram intake again, that the only think i can think of causing the cell. make sure ther are no air leaks or anything like that.

08-22-2007, 07:55 PM	#6 (permalink)
nalinc23 Senior Member Join Date: Jun 2007 Location: Savannah, GA Age: 26 Posts: 221 Nate iTrader: 0 / 0%	but that wouldn't explain why it only happens when it rains out right??

08-22-2007, 09:44 PM	#7 (permalink)
nalinc23 Senior Member Join Date: Jun 2007 Location: Savannah, GA Age: 26 Posts: 221 Nate iTrader: 0 / 0%	anyone else have any ideas?

08-22-2007, 11:59 PM	#8 (permalink)
bioevolve Senior Member Join Date: Dec 2006 Location: Cape Coral, Florida Posts: 432 iTrader: 7 / 100%	Humidity from the rain getting past your filter and collecting dew on the MAF sensor, then dries off after awhile and cell goes away. Or Exhaust opening up before the O2 sensor/sensors when water hits the exhaust and giving the sensor/sensors a lower reading than the normal range. Then exhaust seals back up at optimal temps and give the sensor/sensors proper readings. Just a daily thought. Hook up an OBDII code reader to it and read the stored codes and let us know.

10-05-2007, 07:21 AM	#10 (permalink)
nalinc23 Senior Member Join Date: Jun 2007 Location: Savannah, GA Age: 26 Posts: 221 Nate iTrader: 0 / 0%	My CEL came on AGAIN during the rain, while i was fueling up so I decided to get the code read once and for all....turns out the code is "System running too rich (bank 1)" Possibly when it rains and is humid my MAF is messing up?? The car feels 100% normal, no loss of power or whatnot...anyone else have any ideas what this could be?

10-05-2007, 01:46 PM	#12 (permalink)
mrbill Senior Member Join Date: Nov 2005 Location: MA Posts: 430 iTrader: 1 / 100%	Any other codes together with P0172? Look for codes associated with MAF, Primary and/or secondary A/F sensor, VTEC system, EGR and EVAP. No? Check fuel pressure too high. No? Check for vacuum leaks, particularly check: PCV valve, PCV hose, EVAP purge valve, Throttle Body, Intake Manifold, Brake booster and hose, AIR INTAKE DUCT OK? Check 4,500 RPM warm MAF sensor reading. Between 14-20 gm/sec? Check engine valve clearance, if OK, replace injectors. Outside 14-20 gm/sec? REPLACE MAF sensor/IAT sensor. -mr. bill