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 155,656 nationwide Silverado 1500 listings starting at $1,000.


Chevrolet Silverado 1500 Experts

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

Related Models For Sale

Used GMC Sierra 1500
757 Great Deals out of 61,528 listings starting at $1,395
Used Ford F-150
2,426 Great Deals out of 208,189 listings starting at $1,300
Used Chevrolet Silverado 2500HD
403 Great Deals out of 30,408 listings starting at $3,000
Used Dodge Ram 1500
316 Great Deals out of 9,393 listings starting at $1,995
Used Toyota Tundra
450 Great Deals out of 39,631 listings starting at $2,900
Used Toyota Tacoma
444 Great Deals out of 48,834 listings starting at $2,994
Used Chevrolet Tahoe
554 Great Deals out of 38,496 listings starting at $1,243
Used Chevrolet Colorado
287 Great Deals out of 40,803 listings starting at $1,999
Used Ford F-250 Super Duty
495 Great Deals out of 40,132 listings starting at $2,590
Used GMC Sierra 2500HD
147 Great Deals out of 17,623 listings starting at $2,995
Used Dodge Charger
301 Great Deals out of 32,310 listings starting at $1,850
Used Ford Mustang
268 Great Deals out of 38,445 listings starting at $1,350
Used Chevrolet Silverado 2500
199 listings starting at $5,400

Used Cars For Sale

2019 Chevrolet Silverado 1500 For Sale
1 listings starting at $56,430
2018 Chevrolet Silverado 1500 For Sale
174 Great Deals out of 98,993 listings starting at $18,998
2017 Chevrolet Silverado 1500 For Sale
123 Great Deals out of 8,530 listings starting at $15,995
2016 Chevrolet Silverado 1500 For Sale
172 Great Deals out of 6,532 listings starting at $13,995
2015 Chevrolet Silverado 1500 For Sale
202 Great Deals out of 10,066 listings starting at $10,995

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.