Recent content by Idaho83815

  1. Idaho83815

    '93 K3500, 454 TBI, poor drivability

    Had it on a scanner today. No issues. The Temp Sensor was reading about the same as his laser temp gauge, etc... so that is not likely to cause the poor idle at start up. We went for a drive and the burble, mis, etc at steady cruise felt electrical to him. He suggested trying a new coil...
  2. Idaho83815

    '93 K3500, 454 TBI, poor drivability

    Sabinoerc, Idles bad when cold, but it does smooth out after 1-2 minutes and idles pretty good. I am assuming after transitioning to closed loop once the O2 sensor heats up. It still has the stumble burble pop at steady cruise. ??? Once warm it starts and idles fine but again the cruising issue...
  3. Idaho83815

    '93 K3500, 454 TBI, poor drivability

    Well the fuel pump did not help the cold idle and she still has the shudder/burble/pop out the exhaust at steady cruise. I also tested the TPS and it seems to test OK (0.59V with key on and it goes up in volts smoothly as I twist throttle) Applied vacuum to EGR with hand pump and it holds a...
  4. Idaho83815

    '93 K3500, 454 TBI, poor drivability

    Well the new pump went in. I opted for the 96 assembly. Only small difference was the vent tube location. I cleaned up the pump ground as well as the one in The rear for the tail light harness. Started right up, but is was still somewhat warm from my previous testing. I will have to wait till...
  5. Idaho83815

    '93 K3500, 454 TBI, poor drivability

    Hey Schurkey, I have 13.6 volts at pump with engine running and battery a bit low in volts, and .003 volts on ground using a jumper wire (10AWG) between neg of battery and at ground of pump. New pump assembly arrives today.
  6. Idaho83815

    '93 K3500, 454 TBI, poor drivability

    Hello all, I removed the bed today to get at the pump and wiring. The pump assembly has a lot of surface rust and looks original...wiring looks old etc. I want to go with a new pump assembly to get the new piping, strainer, wire harness etc... I also want to upgrade to the 96 vintage pump for...
  7. Idaho83815

    '93 K3500, 454 TBI, poor drivability

    Also will get to have it on a scanner a week from Friday
  8. Idaho83815

    '93 K3500, 454 TBI, poor drivability

    Thanks Richard. I checked it at the pump side of filter. Good Wix filter installed last week. The kit is a loaner so I can’t leave it on, but it always runs the same lately… like crap at start and shudder at cruise. It also leaked enough fuel that I would not leave it on, especially if at...
  9. Idaho83815

    '93 K3500, 454 TBI, poor drivability

    I think I smell what you are standing in..... good ideas, thanks. Now how to get close to the pump and find the right wires.. I will have to do some looking around under there.
  10. Idaho83815

    '93 K3500, 454 TBI, poor drivability

    Well I will have to verify specs but this 93 7.4 with TBI should have 11-13 PSI. I am only getting 8 psi on key and 11-12 at idle. That gauge in the loaner kit is a 100 psi gauge so it may be a few percentages off at such low psi, but it is probably pretty close. I primed it multiple times and...
  11. Idaho83815

    '93 K3500, 454 TBI, poor drivability

    I got a great loaner fuel pressure test rig in the loaner pool at O’reillys. It has the GM TBI capability at the filter with the fitting in the bottom right of the attached photo. They just got this kit in and it is new. Glad it is a loaner as it is $150 if I don’t return it.
  12. Idaho83815

    '93 K3500, 454 TBI, poor drivability

    Thanks Sabinoerc. I have seen/read where most folks test on pump side of filter, I suppose I can try on both sides to see if any difference. One test fixture I saw online actually replaced the filter with the test fixture…. Hmmm?.
  13. Idaho83815

    '93 K3500, 454 TBI, poor drivability

    Thanks udidwjat. And for those suggesting the fuel pressure test, I have a loaner on reserve as soon as the previous user returns it….
  14. Idaho83815

    '93 K3500, 454 TBI, poor drivability

    Thanks Sabinoerc. I will be working on getting a fuel pressure gauge this week. When you say the ECU ground is on the CTS… you mean the two sets of grounds on the thermostat studs, right? There are four smallish ground wires split 2x2 into ring terminals there.
  15. Idaho83815

    '93 K3500, 454 TBI, poor drivability

    Thanks Amsterdamned. I have two nice cones of fuel coming from the injectors, at least at idle or revved up in park..... Will i hear a clicking on and off, what should I listen for?
See more

Latest posts

Staff online

Members online

Total: 905 (members: 48, guests: 857)

Forum statistics

Threads
64,726
Messages
1,399,494
Members
52,303
Latest member
98sierraSLT

Share this page

Top