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Old 06-28-2010, 04:44 PM   #1
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Join Date: Jun 2009
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wet mass airflow sensor

When driving our motorhome in a heavy rain the "check engine" light comes on. I've had the trouble codes checked and they found that the Mass airflow sensor was wet and would be ok when it dried, which has proven to be the case. The MH is on a 1998 Chev P30 chasis. I'm wondering if the water is comming from the air intake and through the air filter or from some other source. The air filter is accessible from the front right wheel well, so there is lots of water spraying around. Appreciate hearing from anyone having and solving this issue. Thanks

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Old 06-28-2010, 06:05 PM   #2
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Join Date: Apr 2009
Location: Leonard, TX
Posts: 127
I had this problem with a Ford V10 (the MAF sensor is just after the air filter). Diagnosed it with a scan gauge and help from this site. The problem stopped me dead on the road. Had it towed (fantastic service from Coach Net) and then cleaned the sensor myself (carb. cleaner was what I had, so it got used; they do make special cleaner for the sensor) and proceeded. Its very likely that the water is coming through the filter (almost the only way there) and you do need to find out how. I'd also suggest you find the sensor now and carry some cleaner.

Ernie n Tara

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Old 06-29-2010, 01:31 AM   #3
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Workhorse Chassis Owner
Join Date: Sep 2007
Posts: 2,900
if you suspect a maf sensor problem, remove the electric plug. this puts the ecm into default mode and the engine will run better.
my moho was getting water in the intake ''tuba'' through a gap in the top of the front engine access panel. the paper filter was wet and plugged up. i installed weather stripping in this gap. problems with the windshield wiper motor often are caused by this gap.
i installed a k&n gauze panel air filter #33-2062-1 in the stock airbox. it won't plug up when wet like paper filters will. i will use the s&b gauze filter #66-2014d if i ever have to replace it. it is thicker than the k&n filter for better filtration.
it is necessary but difficult to get the airbox to seal properly. the latches are difficult to operate.
01 WINNEBAGO 35U W20.8.1L SW Wa, Hi. Good Sam, SKP. AMSOIL fluids. BANKS ecm program. SCAN GAUGE II w/ Ally temp. 2 LIFELINE GPL-6CT AGM Batts on their sides. TST tptts. K&N panel air filter. AERO mufflers. TAYLOR plug wires. ULTRA POWER track bar. KONI fsd shocks, toad '14 smart car
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Old 07-05-2010, 09:13 AM   #4
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Wet Mass Airflow Sensor

Thanks for info. I guess I would not have thought of the gap around the acess door with the grill wide open jusr below. I'll give sealing it a try.
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