95 chevy k1500 / 350 eng chugs black smoke on takeoff, and smells rich at an idle

Asked by Jun 15, 2015 at 11:01 AM about the 1995 GMC Sierra 1500

Question type: Maintenance & Repair

I have rebuilt the throttle body and replaced the map sensor, there are no codes stored in the computer and the check engine light isn't on.  we go to the lake often and when I back it down the boat ramp it wants to choke and chug real bad when we try to go , don't know why the incline would make a difference but it seems worse on the incline, any ideas?

1 Answer

75,665

It's definitely running too rich (too much fuel). I'd suspect the fuel pressure regulator first. Check the fuel pressure at the service port on the fuel rail. I'd also suspect that the purge valve for the EVAP system is stuck open and raw fuel is being pulled into the engine through the EVAP system vacuum line. Also check your air filter. If it's very dirty, that'll cause a rich condition as well. HTH. -Jim

Your Answer

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,520
  • #2
    John Saffrahn
    Reputation
    3,820
  • #3
    Glenn Clingenpeel
    Reputation
    3,570
View All

Related Models For Sale

Used Ford F-150
2,997 Great Deals out of 230,643 listings starting at $1,300
Used Toyota Tacoma
562 Great Deals out of 40,745 listings starting at $2,600
Used Dodge Ram 1500
319 Great Deals out of 10,792 listings starting at $1,950
Used Chevrolet Tahoe
811 Great Deals out of 40,282 listings starting at $1,900
Used GMC Yukon
482 Great Deals out of 19,478 listings starting at $1,995
Used Chevrolet Camaro
371 Great Deals out of 31,430 listings starting at $3,495
Used Ford Mustang
344 Great Deals out of 41,952 listings starting at $1,488

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
9 Great Deals out of 29,950 listings starting at $22,639
2017 GMC Sierra 1500 For Sale
83 Great Deals out of 5,703 listings starting at $20,999
2016 GMC Sierra 1500 For Sale
115 Great Deals out of 3,463 listings starting at $14,500
2015 GMC Sierra 1500 For Sale
174 Great Deals out of 5,671 listings starting at $13,500
2014 GMC Sierra 1500 For Sale
187 Great Deals out of 4,261 listings starting at $9,995

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.