Rough idle and low power

Asked by Feb 16, 2017 at 01:31 AM about the 2005 Chevrolet Silverado 1500 Work Truck Short Bed 2WD

Question type: Maintenance & Repair

I have a 05 chevy silverado with the 4.3 v6. After
about a minute after starting it, it begins running
really rough and rich like a cylinder isnt firing. When
driving, it has extremly low power until i hit around
45 mph, then it feels like the cylinder begins firing
again and everything goes back to normal. Had an
exhaust leak when the problem started, but fixed it
shortly after. Have also changed plugs, wires,
distributor cap and rotary cap. Next step is to
change fuel filter.

9 Answers

40

Sounds like a spark plug is faulty or a lead. Fuel injector might need replacing ?

3,865

you can remove the idle air control (IAC) and clean that area up , even spray some carb cleaner down the trottle , try some methanol based dry gas , intermediate problems are the worst .

3,865

let us know if problem is resolved

Pulled iac and cleaned it, still has the problem. Not sure if theres a way to check if its faulty, but the engine doesnt have the rpm problems normally indicative of a bad iac. Im assuming that if the fuel pump was going out, the problem would persist no matter what speed im going. Could it be a clogged injector? Or maybe the mass air flow sensor?

3,865

From my experience fuel pumps will have one last go then when you start it next time they're done for .Fuel filter is rarely the problem , If you have the equipment and expertise you can test each sensor and actuator ,have you scanned for codes even though the C.E.L. isn't on ?How do the plugs look ? you might want to bring it to a technician and they can scan it real time . You'll need to find a good , honest one . Some will just replace things like a curb side mechanic .Sad but true there's a lot more ego than talent out there . Like I said intermediate problems are the worst .

3,865

E.G.R valve ? A haynes manual will say how to test most of the components .

Yeah, all of my knowledge is more mechanical than technical. Used to have a 91 model of the same truck, so i learned to take it apart and put it back together, but most of the electrical and sensor components are still new to me

Plugs are brand new, first thing i changed once this all started

So, somewhat strange update. Figured that since i was at a loss, i might as well pull and clean the egr valve. Looked it up in chiltons, and haynes, but their images of the egr location is wrong. From the image i can see what it looks like, and i cant find anything similar looking on the block. . . . did this model truck not come with an egr installed, or am i just missing something i dont know about?

Your Answer

Silverado 1500

Looking for a Used Silverado 1500 in your area?

CarGurus has 173,961 nationwide Silverado 1500 listings starting at $955.

ZIP:

Chevrolet Silverado 1500 Experts

  • #1
    John Carson
    Reputation
    2,770
  • #2
    Rowefast
    Reputation
    2,080
  • #3
    Andrew Olsen
    Reputation
    1,810
View All

Related Models For Sale

Used GMC Sierra 1500
1,221 Great Deals out of 64,511 listings starting at $999
Used Ford F-150
3,230 Great Deals out of 220,432 listings starting at $1,200
Used Chevrolet Silverado 2500HD
391 Great Deals out of 30,491 listings starting at $2,995
Used Dodge Ram 1500
443 Great Deals out of 11,136 listings starting at $2,000
Used Toyota Tundra
699 Great Deals out of 34,234 listings starting at $1,500
Used Toyota Tacoma
709 Great Deals out of 45,297 listings starting at $1,000
Used Chevrolet Tahoe
834 Great Deals out of 41,900 listings starting at $1,987
Used Chevrolet Colorado
343 Great Deals out of 37,952 listings starting at $1,595
Used Ford F-250 Super Duty
394 Great Deals out of 48,880 listings starting at $1,899
Used GMC Sierra 2500HD
111 Great Deals out of 14,209 listings starting at $2,799
Used Ford Mustang
598 Great Deals out of 39,153 listings starting at $1,895
Used Dodge Charger
470 Great Deals out of 33,537 listings starting at $1,999
Used Chevrolet Silverado 2500
10 Great Deals out of 237 listings starting at $3,995

Used Cars For Sale

2018 Chevrolet Silverado 1500 For Sale
31 Great Deals out of 83,936 listings starting at $21,719
2017 Chevrolet Silverado 1500 For Sale
211 Great Deals out of 28,363 listings starting at $16,394
2016 Chevrolet Silverado 1500 For Sale
247 Great Deals out of 6,880 listings starting at $14,997
2015 Chevrolet Silverado 1500 For Sale
483 Great Deals out of 11,855 listings starting at $12,510
2014 Chevrolet Silverado 1500 For Sale
462 Great Deals out of 12,278 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.