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

64,975

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

Add photo

Related Questions

  • rough idle, stalling, loss of power. 228 answers

    o2 sensor code 44 (lean) Replaced: coolant temp sensor, tps, map sensor, fuel filter, and o2 sensor. It will run normal on occasion but only lasts about 45 seconds or so. I don't think its the torqu...

    1995 GMC Sierra 1500 K1500 SL 4WD Extended Cab Stepside SB

    -

    Maintenance & Repair

  • 1990 gmc sierra k1500 5.7 350 1 answer

    My 1990 gmc sierra k1500 5.7 350 will crank and idle great and Rev fine and you can put it in gear and drive it somewhat fine but occasionally it sputters and cuts off and when you mat the gas ped...

    1990 GMC Sierra 1500 K1500 4WD Standard Cab SB

    -

    Maintenance & Repair

  • Need to find 1995 GMC Sierra 1500 5.7L V8 O2 sensor wire 11 answers

    I am doing work on my 1995 GMC Sierra 5.7L V8 I recently purchased. It is idling very rough and stalls when put into gear. When looking through the engine bay, I discovered that the O2 sensor wire wa...

    1995 GMC Sierra 1500 K1500 SL 4WD Standard Cab LB

    -

    Maintenance & Repair

  • Stalling out and wont stay running. Acts like it wants to run but gets choked out. 50 answers

    I have a similiar problem as devin, my 95 Sierra 4x4 it has a 350 5.7L engine and the fuel filter has been replaced I cleaned the injectors out and put a new gasket on. The shop said I have good fuel ...

    1995 GMC Sierra 1500

    -

    Maintenance & Repair

  • Vandura runs rich, smells gassy, sometimes stalls out at low speeds 1 answer

    new here, relatively new to cars but been working on motorcycles for years got a 1990 vandura with a TBI 4.3L V6, had 69k miles on it, had been sitting so i replaced the fuel pump and filter and got ...

    1990 GMC Vandura G25

    -

    Maintenance & Repair

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,920
#2 John Saffrahn
John Saffrahn
Reputation 3,490
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 3,070
View All

Related Models For Sale

Used Ford F-150
2,226 Great Deals out of 208,058 listings starting at $1,499
Used Dodge Ram 1500
434 Great Deals out of 11,296 listings starting at $1,000
Used Toyota Tacoma
490 Great Deals out of 38,718 listings starting at $2,900
Used GMC Yukon
353 Great Deals out of 16,924 listings starting at $2,500
Used Chevrolet Tahoe
571 Great Deals out of 27,185 listings starting at $999
Used Chevrolet Camaro
155 Great Deals out of 32,695 listings starting at $1,995
Used GMC Sierra 2500
164 listings starting at $4,995

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
38 Great Deals out of 41,310 listings starting at $20,121
2016 GMC Sierra 1500 For Sale
90 Great Deals out of 3,766 listings starting at $17,695
2015 GMC Sierra 1500 For Sale
100 Great Deals out of 3,875 listings starting at $15,400
2014 GMC Sierra 1500 For Sale
99 Great Deals out of 4,230 listings starting at $14,495
2013 GMC Sierra 1500 For Sale
66 Great Deals out of 2,112 listings starting at $9,260