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12-23-2012, 08:08 PM
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#1 (permalink) |
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Diesel Enthusiast
Join Date: Jan 2010
Posts: 4
iTrader Score: 0 reviews
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K&N filter causing reduced power
Hello. I recently installed an oiled K&N filter in the stock air intake in my 2007 lmm. The truck has no mods, no programmer, etc. The filter is seated good and tight and appears to be fine.
After driving for a day or two, the reduced engine power warning will appear. The truck doesn't lose power, appears to run normal. The engine light will remain on, but no more REP warning. When I switch back to the stock filter, the engine light will go out after a couple of days or so many engine starts, and everything is back to normal. I have tried this twice and it is the exact same result. Any idea what could be causing the K&N filter to throw the REP warning light on? Thanks |
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12-23-2012, 08:45 PM
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#2 (permalink) |
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Probie
Diesel Master
Join Date: Jun 2007
Location: Upland, California
Posts: 1,962
iTrader Score: 0 reviews
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Those K&N filters and their air intake kits are notorious for messing up the Mass Airflow Sensors. Maybe residue from the oiled filter is getting on the MAS.
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Truck: Bought new 2007.5 LMM 2WD Chevy Silverado LT, ORU leveling kit & Bilstein shocks, PPE HID's 5000K Motor Mods: PPE Hot+2 tuner, PPE ported fuel rail fitting, Banks air intake/filter & super scoop, Banks boost tube, Air Dog II 165 LP, EGR blocked, 5" Flo-Pro DPF back exhaust, PPE Centrifuge, Superflow Dyno @ Westech Performance Group (522hp & 956lbs. torque Hot+2 Race) with DPF & CAT 506hp & 925lbs.torque (Smog Legal once again)  Trans: Stage 3 built by Mike L. (Inglewood Transmissions), with Suncoast 1057 TC, PPE pan, Upgraded trans lines. Rearend: Re-Geared with 4:10 and Chrysler posi unit, Mag-Hytec cover, Firestone airbags. Tires & Wheels: 2012 GMC factory 18" with Michelin 265/70R18 LTX A/T 2 with 1.5" adapters by Motor City Bolt On Interior: PPE EGT, Boost and Fuel rail pressure guages, Alpine HU, Components, JL Audio 8"ported sub, (2) Alpine amps.1988-1992 USMC, 3RD AABN, Desert Storm/Shield Vet 
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12-23-2012, 08:51 PM
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#3 (permalink) |
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Diesel Master
Join Date: Nov 2008
Location: Temple Hills Md
Posts: 1,861
iTrader Score: 1 reviews
DelMarVa Diesel Club Member |
Do some searching on k&n filters on dmax engines.......not a very good combination
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Dave 2008 3500 HD DUALLY 4WD SLE 420 HP/855TQ 6.6 LMM D-MAX,4inch Turbo back straight pipe into 7 stacks,Modified Allison 6 speed done by suncoast, EFI LIVE & DSP5 Switch,DPF,DOC,EGR delete ,PVC re-route,Filtration F.A.S.S. w/Donaldson P551313 & water seperator ,Niketane filter adapter w/Cat filter 1R-0750 /Wheels 22.5 ALCOA's wraped on Michelins 255/70/22.5 Window Tint 5% on all windows 55% on windsheild,Gauges... Boost,Fuel PSI,Differential &EGT and EDGE CTS monitor,Nathan K3LA & K5LA Train horns  ....Blue L.E.D. underbody lights, CODE 3 Siren/P.A. system, BLIZZARD 9' Snow plow MAG-HYTEC differential cover , Alligator Performance tranny lines, Banks ram air w/super scoop, Coolant filtration kit,Merchant Automotive motor mountsMy rumble tune ...NO DAM HISS AT IDLE http://www.youtube.com/watch?v=qCcrFAouxB0Listen too the MAX http://www.youtube.com/watch?v=9VTXyUxnZmU Back-up truck>>>> 2002 Chevy Silverado Generation III 5.3L z71 130k+ miles |
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12-24-2012, 06:48 AM
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#5 (permalink) | ||
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Diesel Specialist
Join Date: Feb 2011
Location: Somewhere in TX
Posts: 807
iTrader Score: 0 reviews
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Stick with the stock filter & problem solved.
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2009 Sierra 2500HD LMM SLE CC/SB 4x4 Stock. Pacer LED NBS Cab lights, Putco yellow bulb Fog lights, GM Dually light bar, Footwell lights, Tinted windows, GM chrome oval Running Boards, Fumoto oil drain valve, Bilstein HD shocks, PY0 wheels, Michelin LTX M/S2 LT245/75R/16E, Rear rubber Mud Flaps, Curt Hitch class IV, Kenwood speakers, Cobra 29 CB radio, Wilson 2000 CB antenna  2011 Silverado 2500HD LML WT EC/SB 4x2 Stock. (Co. truck) Quote:
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12-24-2012, 06:56 AM
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#6 (permalink) |
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Diesel Technician
Join Date: Dec 2012
Location: Hico, TX (once home to Billy the Kid)
Posts: 196
iTrader Score: 0 reviews
Armed Forces Club Member |
I have read that K&N cause issues on these trucks also.
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2009 2500HD 6.6 LTZ Z71 Master Chief, US Navy, Retired My Garage Pics Advent OGM1 Nav/DVD/CD system with BU cam, Spray in bed-liner, UnderCover bed cover, AMP Power Steps and Tailgate Step, Full tint windows, Weathertech floor liners, Wheel Well Fuel Filter Access Cover, Nicktain Pre-filter and Cat engine fuel Filter Adapter, Michelin LTX M/S2's Am fear nach gleidh na h-airm san t-sith, cha bhi iad aige 'n am a' chogaidh |
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12-24-2012, 07:01 AM
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#7 (permalink) |
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Diesel Fanatic
Join Date: Aug 2008
Location: SE Minnesota
Posts: 57
iTrader Score: 0 reviews
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Been there - done that. 1st GM has a service bulletin not to use any filter other than their own and they name K & N as not to use. 2nd K & N has a notice not to use their filter unless you do the entire air intake system. K & N returned my money for the filter.
Oil from the filter getting on the sensor is one of many stories. The actually problem per GM and K & N is that too much air is coming into the engine. Both their stories - not mine. Buy a G M filter is the solution. |
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01-13-2013, 02:57 PM
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#9 (permalink) |
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Diesel Technician
Join Date: Oct 2004
Location: Fontana, CA
Posts: 405
iTrader Score: 0 reviews
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I had the same issue. Got mine at Autozone after the representative recommended it. I went on a trip towing my toy hauler and the check engine light came on. I had my diagnostic tool in the truck and ran the code and it was the mass air flow. I had to reset the code everytime it went off or it would go into reduced power mode. I took it back to Autozone and they tried to blame the issue on me. I advised them that I never had a single issue with the stock filter before using the K&N. After some haggling they refunded my money. I put the stock filter back in and no issues since.
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2008 GMC Sierra, Crew Cab, Black, Rhino Liner, Alpine LCD Drop Down DVD, Fumoto Valve, Viair Heavy Duty Onboard Air, Recon Backup Lights, Arnott Air Bags. |
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01-13-2013, 08:37 PM
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#10 (permalink) | |
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Diesel Specialist
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Quote:
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2007.5 GMC 2500HD. Bilstein Shocks / Banks muffler delete tailpipe. DashHawk + EGT Probe + Edge Dashpod. Michilen LTX MS2 / Leer 700 Hard tonneau. Katzkin Leather / WeatherTech floormats. Fuel Filter Service Door / Aluminum bleeder screw.
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Everytime "The Derp" gets a CEL the code comes back as ID10T, user error.
