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


Asked by Jul 03, 2014 at 10:52 AM about the 1990 GMC Vandura G25

Question type: Maintenance & Repair

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 it running, ran absolutely perfect at first but a few days later started smelling rich at low speeds, hesitates sometimes and stalls at very low speeds if you blip the throttle, seems to run boggy then overcome it once speed increases. usually runs fine at interstate speeds but in town or in parking lots it can be a turd. shakes a bit at idle now too. was throwing codes 33 and 45, swapped out the MAP sensor and it made no difference, replaced the O2 sensor, all the small vacuum lines, re-hooked up the line going from the TBI body to the vapor canister, PCV has good vacuum, new cap, rotor, plugs, swapped out injectors with my other van, put all new gaskets and o-rings in the TBI, nothing seems to have made a major difference. just wondering if theres a main thing i should check or if maybe the new fuel pump is messed up already or something? also fuel pump is very loud and audible inside the van, has been since i installed it, not sure if thats normal. thanks for the help!

1 Answer


also should mention idle seems a bit high now but smooth. braking seems slightly affected and sometimes will be very strong after startup but not be quite as strong after driving. line going to the brake booster does not look cracked or leaky, not sure if that could be related?

Your Answer

Add photo

Related Questions

  • van towing 2 answers

    I have a 1990 GMC G3500 with a 350 and assuming a th400 transmission. The transmission's not the issue. I have an RV weighing about 7500 lbs. My current 5.7 ltr simply won't pull this trailer. It will...

    1990 GMC Vandura G35 Extended


    Car Customization

  • 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

  • Stalls like not getting fuel but switch off and back on and run fine until next time. 2000 Sonoma 6 answers

    My 2000 Sonoma runs fine but 2x per week when around town it stalls and applying accelerator does nothing.. Switch it off and back on and it runs fine until next time. Maybe throttlebody or computer....

    2000 GMC Sonoma SLE Ext Cab


    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

  • 1990 GMC Sierra low idle and stalling 3 answers

    I have a 1990 k1500 low idle and stalling problem, I replaced my fuel filter and spark plugs, i changed the fuel pump 3 years ago. Weird thing is when I rev the engine the oil display moves with ...

    1990 GMC Sierra 1500 K1500 4WD Standard Cab LB


    Maintenance & Repair

Search GMC Vandura Questions

GMC Vandura Experts

#1 John Saffrahn
John Saffrahn
Reputation 90
#2 ajodell
Reputation 80
#2 Js08016
Reputation 80
View All

Related Models For Sale

Used GMC Safari"
3 Great Deals out of 142 listings starting at $1,600
Used GMC Sierra 1500"
1,033 Great Deals out of 55,846 listings starting at $2,400
Used Dodge Ram Van"
188 listings starting at $3,999
Used GMC Safari Cargo"
43 listings starting at $4,287
Used GMC Sonoma"
5 Great Deals out of 579 listings starting at $1,995
Used Ford E-350"
280 listings starting at $2,995
Used Chevrolet Camaro"
813 Great Deals out of 39,018 listings starting at $2,650