Hello, I have a 1993 GMC Sierra 1500 5.7 v8. only in cool to cold temps the eng. acts like it wants to choke out and die.

Asked by Dec 12, 2015 at 04:52 PM about the 1993 GMC Sierra 1500 C1500 SLE Extended Cab SB

Question type: General

After it warms up it runs better but acts up at times.  in the summer or temps 60 degrees or higher it runs great.  I have changed the fuel filter, spark plugs, cap and rotor.  any ideas why this only happens in cooler weather? Thanks Devon

1 Answer

60,965

Hi Devon, sounds like good old fashioned throttle plate icing. The throttle plate area must be kept warm to avoid ice forming on the throttle plates in cool/cold damp weather. Check your air cleaner assembly and be sure the damper inside the snorkel is working. On a cold start up it should be closed to outside air and pulling air from the hose on the bottom of the snorkel that hooks up to the exhaust manifold area at the other end. If you have a heat riser system check the exhaust manifold heat riser valve. Possibly referred to as an EFE (Early Fuel Evaporation) valve. This valve will have a vacuum hose hooked up to it and is on the right (passenger's side) exhaust manifold back by the firewall. It's job is to direct hot exhaust gasses up under the throttle body area. Sometimes the passage in the intake manifold (exhaust crossover passage) will get clogged with carbon and need to be cleaned out. HTH. -Jim

Your Answer

Add photo

Related Questions

  • My 1993 gmc sierra will start but die in drive. 1 answer

    1993 5.7 2wd gmc sierra, I changed the fuel lines, now it will start and idle fine but in drive it will die. Pushing the pedal to the floor will not keep it running. It will not restart for hours.

    1993 GMC Sierra 1500 C1500 SLE Standard Cab Stepside SB

    -

    Maintenance & Repair

  • rough idle, stalling, loss of power. 225 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

  • my 94 gmc sierra 1500 will start then dies and then wont start again for awhile 6 answers

    i will start my truck and it will idle for alittle bit then it dies and wont start again for alittle while. you can smell fuel like it is flooded.. can anyone help plz, pretty much have replaced ever...

    1994 GMC Sierra 1500 K1500 SL 4WD Standard Cab SB

    -

    Maintenance & Repair

  • started stalling and dying when in gear 89 answers

    350 motor 4L60E trans Motor wants to stall while in gear (but doesn't do it out of gear once over 1000 rpm it dosent) seem to stall and it is only from a dead stop. Fuel filter has been replaced an...

    1994 GMC Sierra 1500 C1500 SLE Extended Cab SB

    -

    Maintenance & Repair

  • i have put a battery and a alternator and if i drive it for about 20 min. the battery will die so what could be wourg 1 answer

    i have put a battery and a alternator and if i drive it for about 20 min. the battery will die so what could be wrong

    1995 GMC Vandura G25 Extended

    -

    General

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,770
#2 John Saffrahn
John Saffrahn
Reputation 3,360
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 2,960
View All

Related Models For Sale

Used Ford F-150
2,693 Great Deals out of 211,512 listings starting at $1,000
Used Dodge Ram 1500
530 Great Deals out of 12,822 listings starting at $1,995
Used GMC Yukon
516 Great Deals out of 17,124 listings starting at $1,799
Used Chevrolet Camaro
282 Great Deals out of 38,308 listings starting at $1,250

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
23 Great Deals out of 35,674 listings starting at $23,699
2016 GMC Sierra 1500 For Sale
53 Great Deals out of 3,969 listings starting at $18,219
2015 GMC Sierra 1500 For Sale
119 Great Deals out of 4,042 listings starting at $14,988
2014 GMC Sierra 1500 For Sale
150 Great Deals out of 4,383 listings starting at $14,495
2013 GMC Sierra 1500 For Sale
89 Great Deals out of 2,374 listings starting at $9,988