I have a 2005 Chevy 1500 Silverado, 5.3 Flex. 20,000 miles.About two months ago, my check engine light came on. Went to the parts store and found out it was the mass air sensor, and changed it out with exact OEM part. The truck still struggles going uphill, trans seems to be shifting properly. Could it be another sensor, gas filter, etc? It just seems the engine is struggling. I have always used pure gasoline, not flex fuel.


Asked by Feb 23, 2013 at 02:49 PM about the 2005 Chevrolet Silverado 1500

Question type: Maintenance & Repair

11 Answers


Is your check engine light still on? Sometime those codes pinpoint which sensor is detecting the problem, but it isn't always that sensor. Did you clear the code after reinstall or disconnect the battery to clear everything? When replacing sensors it's always good to remove the negative battery cable to clear the memory. You also could have some misfires, meaning you need to replace a coil. Give us some more details.

2 out of 2 people think this is helpful.

whatever caused the MAF to stop responding (these have rare earth metals, and are pricey) the first fail also was the reason for the second fail. The egr should divert air on a circuit that the MAF doesn't see....perhaps some stuck or disconnected bit of hose plumbing is causing failures. things do not seem right in denmark, for something that's so new. Must be something really small and silly!

1 out of 1 people think this is helpful.

the beloved EGR is cause for unseen badness in performance-


The check engine light is off, never came on again. I haven't disconnected the battery to reset. I was on rough rocky road a week before this started. The connector to the MAS was tight. It doesn't feel like I have a mis, no rough running. Bob, that's what I was thinking, something is disconnected. I looked but can't see anything. I'll give it another try and disconneted the battery. Any suggestions where to look, vacuum line, connector?

3 out of 3 people think this is helpful.

look for a diconnected vacuum line, this would explain everything~

2 out of 2 people think this is helpful.

look for something that isn't working right. test stuff if you can by removing to see if vacuum or pressure IS on the spot, or get one of these suction/gauge devices where you can apply suction to see if a device is doing it's job...these are quite useful- but the check engine light will reveal what needs attention. You could go at it "commando" and test everything like a madman, but it's best to have a little intelligence behind your tests- I can look to see your vacuum diagram to make an educated guess-

god forbid a choked catalytic converter...now why might this happen? Something in the computer told it to run rich, and now we've got a hot converter because some of the energy of the gasoline is firing off in your exhaust, in the Catalytic converter! gotta make it run right before replacing the cat or we'll have deja vu all over again!


No funny smell from exhaust, starts great also. I'm going to change the gas filter and take a run up to the mountains and if that fixes it.

1 out of 1 people think this is helpful.



I guess the gas filter for my truck is in the gas tank?

1 out of 1 people think this is helpful.

probably a small can with nipples at both ends. 'bout 3 1/2" lg.

Your Answer

Add photo

Related Questions

  • 2005 Silverado-V8 Flex Fuel 4X4 20,000 miles No PowerI 2 answers

    I've asked this question before, still have the same problem. A while ago my check engine light came on, I had it checked at Autozone. Code said MAS was bad or another sensor could be the problem....

    2005 Chevrolet Silverado 1500 Ext Cab 4WD


    Maintenance & Repair

  • 2004 silverado Z71 flashing check engine light 48 answers

    my check engine light has come on and had started blinking just lately. which means engine misfire. after replacing the plugs and wires the truck seems to have a rough idle and still seems to misfire ...

    2004 Chevrolet Silverado 1500 Z71 Crew Cab Short Bed 4WD


    Maintenance & Repair

  • Engine Shutting off after about 10-20 seconds on 2004 Silverado 1500 60 answers

    Can anyone shed some light on this problem. After driving my 04' Silverado 1500 all day without any problems, after the truck sat in the driveway for a couple of hours, the truck started right up, but...

    2004 Chevrolet Silverado 1500


    Maintenance & Repair

  • Loud knocking noise 5.3 55 answers

    I have a loud knocking noise coming from the engine . At first I thought it was comin from the top but when i get under it it's alot louder sounds like its comin from the oil pan. I had the transmissi...

    2005 Chevrolet Silverado 1500 Z71 Crew Cab 4WD


    Maintenance & Repair

  • mass air flow sensor 24 answers

    I have a 1999 grand prix gt. My service engine light came on and i went to auto store and used the computer. It indicates the mass air flow sensor is problem. So I tried some cleaner and reset the...

    1999 Pontiac Grand Prix


    Maintenance & Repair

Silverado 1500

Looking for a Used Silverado 1500 in your area?

CarGurus has 170,135 nationwide Silverado 1500 listings starting at $1,800.


Search Chevrolet Silverado 1500 Questions

Chevrolet Silverado 1500 Experts

#1 John Carson
John Carson
Reputation 2,140
#2 Rowefast
Reputation 1,800
#3 Silverado_owner_2006
Reputation 1,610
View All

Related Models For Sale

Used GMC Sierra 1500
796 Great Deals out of 67,165 listings starting at $2,700
Used Ford F-150
2,253 Great Deals out of 209,704 listings starting at $1,499
Used Dodge Ram 1500
448 Great Deals out of 11,375 listings starting at $700
Used Chevrolet Silverado 2500HD
304 Great Deals out of 26,958 listings starting at $1,250
Used Toyota Tundra
501 Great Deals out of 34,165 listings starting at $3,000
Used Toyota Tacoma
502 Great Deals out of 39,894 listings starting at $1,995
Used Chevrolet Tahoe
577 Great Deals out of 27,581 listings starting at $1,500
Used Chevrolet Colorado
220 Great Deals out of 23,475 listings starting at $1,395
Used Ford F-250 Super Duty
342 Great Deals out of 47,687 listings starting at $1,495
Used Chevrolet Silverado 2500
8 Great Deals out of 292 listings starting at $4,500
Used Chevrolet Silverado 1500HD
14 Great Deals out of 268 listings starting at $3,950
Used Ford Mustang
389 Great Deals out of 47,511 listings starting at $1,800
Used Dodge Charger
284 Great Deals out of 27,348 listings starting at $2,250

Used Cars For Sale

2017 Chevrolet Silverado 1500 For Sale
45 Great Deals out of 116,483 listings starting at $20,542
2016 Chevrolet Silverado 1500 For Sale
141 Great Deals out of 6,039 listings starting at $20,499
2015 Chevrolet Silverado 1500 For Sale
173 Great Deals out of 7,280 listings starting at $15,888
2014 Chevrolet Silverado 1500 For Sale
270 Great Deals out of 10,453 listings starting at $9,988
2013 Chevrolet Silverado 1500 For Sale
156 Great Deals out of 5,113 listings starting at $7,650