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  1. G

    1987 350 TBI code 42

    hard to imagine its running well with code 42 set. this should help diagnose. if it isn't the ignition control module and the EST wire is plugged in, I'd expect to have to carefully evaluate the ICM and coil connectors and wires to look for the issue. a quick check on the EST wire would be to...
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    Options for tuning of Gen1 TBI in 2023

    I use my phone with ALDLDroid and a Bluetooth OBD1 connector. you can export the csv files to your email and open in excel and save as an excel file.
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    1986 gmc sierra classic c2500 aldl location

    not sure about the earlier years, but on my 1990 it is below the dash to the right of the e brake release
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    Options for tuning of Gen1 TBI in 2023

    I was just logging with ALDLDroid, which isn't as capable as other software.
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    Code thrown but not for my year/MAP issue

    ECM can't tell of the cat is clogged. I had a miss at idle and under low vac/low RPM situations. it went away after I replaced my exhaust system. it was driving me nuts. I can only assume it was the cat....
  6. G

    Code thrown but not for my year/MAP issue

    if the code 34 is intermittent, check the vacuum lines again and wiggle the harness around and see if you can get it to throw the code again. take the sensor out of the bracket and move/twist it to manipulate the harness. you might also consider running some ac delco top end engine cleaner...
  7. G

    Code 24, when going down hill.

    loss of VSS signal indicates a wire may be broken or mostly broken and going down hill moves it just right so it loses connection. I'd be looking at the harness to the VSS running alongside the transmission and/or transfer case as the most likely spot for an issue like that. just fyi - I had...
  8. G

    Lacking power, 87 Sierra 5.7l TBI

    if the tach is jumping around even though the engine seems to be at constant RPM, there could be extra references from a poor distributor (ICM) ground or interference from the plug wires being too close to distributor/coil wires.
  9. G

    Glove Box Latch 73-87 (91) Chevy GMC Trucks

    it's been a year or so since I've ordered from them, but I never had any issues with LMC across more than a dozen orders.
  10. G

    New TBI injectors causing surging

    are you running a stock engine and stock PROM chip? if not, maybe somebody has modded the engine and has tuned the PROM chip and installed different flow rate injectors. are there any numbers to compare on the old injectors to new injectors?
  11. G

    New TBI injectors causing surging

    save the money on throwing parts at it and use it to get ALDLDroid and a Bluetooth OBD1 cable to diagnose. it will save money on parts in the long run.
  12. G

    How to flash high beams?

    I don't think that is an OEM option.
  13. G

    No power at all

    ignition switch?
  14. G

    Water on drivers floor

    been a minute since I've done it, but if you fed something down from the cowl and it came out there, that's gotta be it. I just remember not being able to fit my hands in there very well and using a stick. I kept flushing water from the cowl to push stuff down and using the stick to help pull...
  15. G

    New TBI injectors causing surging

    Biggest change when the engine gets warm is that it goes into closed loop operation and starts using the O2 sensor feedback to adjust fuel. What condition is the O2 sensor in? Strange that it only happens with new injectors. Maybe the old injectors are dirty and even though the computer is...
  16. G

    74 k10 going 55 mph is at 3,500 rpm

    I bet it is off about 25% too high bc of the tach being not set up for a v8. 3500 x 0.75 is 2625 RPM
  17. G

    74 k10 going 55 mph is at 3,500 rpm

    I bet the RPM difference is proportional to engine speed. 220 at idle might be more at higher RPM....
  18. G

    74 k10 going 55 mph is at 3,500 rpm

    good question about the tach. I am not that familiar with aftermarket tachometers or if there are different types, etc.. but at 3500 rpm the engine should definitely be making some noise. that can be used as a quick reality check on the tach readout. is the engine really screaming at 55mph?
  19. G

    Water on drivers floor

    I still think the drains are clogged at least partially. stuff gets in there and bridges across the gap and water seeps in when it pools up. it is a dirty job to clean/flush/clean/flush until nothing else can be pulled out with a stick. but after I cleaned mine, I couldn't overwhelm it with a...
  20. G

    74 k10 going 55 mph is at 3,500 rpm

    also verify speedo is correct with your phone GPS
  21. G

    74 k10 going 55 mph is at 3,500 rpm

    use this to check what your RPM should be for your setup. it's the most accurate and comprehensive that I've found. http://www.grimmjeeper.com/gears.html
  22. G

    Water on drivers floor

    not sure. mine is a 1990 suburban
  23. G

    Headlights on= No Turns, Headlights off= Turns

    if the issue is new with the LEDs, try going back to incandescent bulbs.
  24. G

    Water on drivers floor

    It's been a bit since I have done mine, but I thought the actual drain exit was tucked back farther where this arrow is pointing.
  25. G

    Water on drivers floor

    I had to remove a piece of foam and use a stick to keep pulling stuff down, then flush with water, and repeat until no more came down when I have cleaned mine.

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