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


Asked by Jun 26, 2013 at 11:38 PM about the 2005 Chevrolet Silverado 1500 Ext Cab 4WD

Question type: Maintenance & Repair

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.  I waited a few months to
change the MAS because the light went off,  but eventually came back on,  and truck
was losing power under load.  I changed the sensor at this time.
The truck still has no power trying to pass, driving uphill,  and driving at elevation.
I took the truck to my local chevy dealer,  no codes showed up and they said nothing
was wrong.  They must not have gone for a test drive.  It's obvious something is wrong.  
The dealer did say the truck is running a little lean,  but they don't know why.(?)
My question is,  could it be the converters plugging up?  Since I did drive the truck a
few months before changing the MAS,  and the engine is running lean,  could this plug
the converters.  I just can't just start changing sensors.
The transmission seems to be shifting correctly and only has 20,000 miles,  I don't
think it could be the trans.
I've only used gasoline and not flex fuel.  This year truck has the in-tank,  100,000
mile(?)  fuel filter.
Any ideas out there?

2 Answers


Take the truck to a local mechanic and have them look at it. Tell them what you told us, they can check the cats. It could many different issues, and since you have no codes. we would be shooting in the dark. My guess is you might have a misfire . Could be a bad coil or a fouled spark plug or plugs. Sometimes you don't get a code, sometimes you do. How many miles on the truck, ever replace the plugs? A misfire, if left go can clog a cat eventually from unburnt fuel entering them.

Best Answer Mark helpful

Thanks Tom. The truck has only 20,000 miles, sits in the garage except for long trips. The plugs have never been changed. My S10 4.3 has more power!

Your Answer

Silverado 1500

Looking for a Used Silverado 1500 in your area?

CarGurus has 173,588 nationwide Silverado 1500 listings starting at $955.


Chevrolet Silverado 1500 Experts

  • #1
    John Carson
  • #2
  • #3
    Andrew Olsen
View All

Related Models For Sale

Used GMC Sierra 1500
1,209 Great Deals out of 64,383 listings starting at $999
Used Ford F-150
3,217 Great Deals out of 219,866 listings starting at $1,200
Used Chevrolet Silverado 2500HD
391 Great Deals out of 30,423 listings starting at $2,995
Used Dodge Ram 1500
436 Great Deals out of 11,084 listings starting at $2,000
Used Toyota Tundra
690 Great Deals out of 34,197 listings starting at $1,500
Used Toyota Tacoma
707 Great Deals out of 45,170 listings starting at $1,000
Used Chevrolet Tahoe
822 Great Deals out of 41,738 listings starting at $1,987
Used Chevrolet Colorado
343 Great Deals out of 37,645 listings starting at $1,595
Used Ford F-250 Super Duty
398 Great Deals out of 48,649 listings starting at $1,899
Used GMC Sierra 2500HD
113 Great Deals out of 14,167 listings starting at $2,799
Used Dodge Charger
467 Great Deals out of 33,335 listings starting at $1,999
Used Chevrolet Silverado 2500
10 Great Deals out of 231 listings starting at $3,995
Used Ford Mustang
587 Great Deals out of 38,990 listings starting at $1,895

Used Cars For Sale

2018 Chevrolet Silverado 1500 For Sale
32 Great Deals out of 83,534 listings starting at $21,719
2017 Chevrolet Silverado 1500 For Sale
213 Great Deals out of 28,577 listings starting at $16,566
2016 Chevrolet Silverado 1500 For Sale
243 Great Deals out of 6,856 listings starting at $14,997
2015 Chevrolet Silverado 1500 For Sale
483 Great Deals out of 11,835 listings starting at $12,510
2014 Chevrolet Silverado 1500 For Sale
464 Great Deals out of 12,220 listings starting at $9,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.