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  1. S

    4l80e 3rd and 4th shift

    [SOLVED] Problem was the output shaft sensor on the tail shaft. Pulled it from another truck and problem went away.
  2. S

    4l80e 3rd and 4th shift

    Hello I have a 1994 K2500 Cheyenne with a 4l80e. The truck has had a rebuilt transmission put in and the 3rd and 4th shift is super funky. Funky as in it can’t find it’s correct gear. Once at about 35mph speedometer starts to jump around then the tranny will shift back and fourth from 3rd to...
  3. S

    P0300 1996 K1500

    welp putting the updated spider injector and code is absent. going to be driving to set monitors and smog wish me luck
  4. S

    P0300 1996 K1500

    so i swapped the spider but it seems to pick up idle like its going full throttle
  5. S

    P0300 1996 K1500

    MAP 11'' Spark Advanced -22 02 Switching up and down voltages STFT B1S1 10% STFT B1S2 99.2% STFT B2S2 50% STFT B2S2 99.2% LTFT B1 -3% LTFT B2 -6%
  6. S

    P0300 1996 K1500

    Fuel pressure KOEO 50PSI Fuel Pressure Idle 60PSI Fuel Pressure Revving 65PSI How do the pressures look?
  7. S

    P0300 1996 K1500

    Okay thanks for the input.
  8. S

    P0300 1996 K1500

    So i bought a new cap and rotor. old one was corroded. i am wondering if the distributer shaft itself is the problem. Im waiting to get a timing light from my buddy to check the timing. if it is off then that might be my problem. I think im im going to pull off the cap and rotor i put on and buy...
  9. S

    P0300 1996 K1500

    New rotor and cap put on they were both corroded. Issue still exist. Im going to to test fuel, im leaning towards the issue being fuel related.
  10. S

    P0300 1996 K1500

    Okay im im going to make a trip to harbor freight to grab some tools to test the fuel pressure and vacuum. They do have a scan tool for 70$ my buddy was telling me shows voltages, or i might stop by a family friends shop to use a snap on scanner. far as voltages i could back probe the sensors.
  11. S

    P0300 1996 K1500

    Wouldn't a lean condition cause it to run rich? Unmetered air would be seen by o2 causing the computer to inrich the mixture right?
  12. S

    P0300 1996 K1500

    They were black definitely running rich. It smells rich too. maybe thinking there might be a vacuum leak.
  13. S

    P0300 1996 K1500

    Okay i just replaced all plugs and wires, old plugs were almost all fouled. Cleared codes and CEL came right back on im im going to hook up a different scan tool when i i get a chance. this is the tool i i have ...
  14. S

    P0300 1996 K1500

    put 5 gallons in and cleared codes. Started it up and it was rough, set same code right after. I have a AutoLink scanner sure it isn't the most sufficient compared to snap on but im pretty sure it would be able to see if just one cylinder was acting up
  15. S

    P0300 1996 K1500

    well the truck has very low fuel like on empty so i i couldn't siphon anything out. im gonna grab gas from the station and add some enzyme furl treatment.
  16. S

    P0300 1996 K1500

    okay i will attempt to get some fresh gas in it later and update you guys.
  17. S

    P0300 1996 K1500

    I just bought a truck with a random cylinder misfire. Little back story on the truck, it was this guys brothers who passed away, he parked the truck and it sat for over a year. I went to look at it wouldn't start, i noticed a spark noise which i then saw coming off the distributer was chewed...
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