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    Engine running rough

    Code 12 is the "all good" code. Any blown fuses? Particularly ECMB?
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    87 tbi 350 popping at idle and running rich

    the sometimes lack of power and sometimes fine makes me think about an intake manifold vacuum leak. also check to make sure the EGR isn't stuck open.
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    87 tbi 350 popping at idle and running rich

    a timing light works well for this. the strobe effect helps. and while the timing light is out, I'd disconnect the EST and check base timing to make sure it is at 0 deg BTDC (or maybe a little more won't hurt, but you don't want less).
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    One more electrical plug identification

    pretty sure green wire single connector is the temp sensor for the gauge between cylinders 1 and 3.
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    washer pump not working

    I have a similar situation. my washer won't work when it is below about 50deg in the cab. works great after cab warms up and all spring, summer, fall. I have a bad connection in the switch I think. because when I ground pink at the module, the washer always works regardless of temp. I plan to...
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    How to "Un-Lift" my suburban

    350/700r4/4.10 would be pretty good with 32-33in tires. I have the same in my burb but with 3.73. I wouldn't mind a little more gearing at times when its windy on the highway, or another 50hp...whichever is easier
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    1987 454 TBI stalls at idle after a short time

    I think some of the 454s idled in open loop as a matter of the stock PROM. So open loop idle might not be anything to worry about.
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    1987 454 TBI stalls at idle after a short time

    I've had intermittent short to ground issues on ECMB and ECMI circuits kill the engine. usually it blows a fuse. but sometimes I think it might interfere just enough to kill the engine, but not blow the fuse until it really shorts. I've also had a cracked distributor cap cause similar...
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    1987 454 TBI stalls at idle after a short time

    this is a direct link- http://aldlcable.com/aldl.asp also you can check out https://reddevilriver.com/home-page/ols/products/gm-12-pin-aldl-scan-bluetooth and use your phone with ALDLDroid. I have a 1320 electronics Bluetooth ALDL, but they have apparently gone out of business. but you maybe...
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    What have you done to your square lately??

    not sure what the issue is, but TBI > Carb. diagnose whatever the issue is and fix the TBI
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    86 1/2 ton gears needed for 33” with new 383

    there is a rare 4.30ish something, but it isn't commonly available. with 32-33in tires, that would just about put it like stock tires and 3.73s. I bet 35s and 4.56 is probably close to a "stock" gearing/tire size for 3.73.
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    Dakota Digital RTX gauge cluster

    maybe it is intentionally off center and at an angle to allow better viewing of the lower left gauge spot from the drivers point of view.
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    86 1/2 ton gears needed for 33” with new 383

    I have 350tbi/4L60/3.73 in my burb with "33's" that actually tape out around 32 inches. it is adequate enough that I won't likely regear but will look to add about 50 more hp when the engine dies. really it isn't bad on the highway cruising around 2100 RPM at 74-75mph flat ground. it does...
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    LED Issues

    I plan to stick with incandescent bulbs for brakes/blinkers because of these sorts of issues. I just don't see the huge upside with LED in these uses compared to the obvious advantages in forward lighting, reverse lights, the instrument panel, etc.
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    1987 V3500 Engine update

    out of curiosity, why aren't you sticking with the TBI?
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    Replace Gauge Needle

    you can replace it if you can find one. you can gently pry them off with a fork. it is just a friction fit. or you may be able to glue your old one back on?
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    1987 V3500 Engine update

    Keep us posted on that new block! That is the same one I have my eye on when the time comes for me.
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    89 Suburban 5.7 blowing fuse #5 GAGE/IDLE

    I'd guess that your manipulation of the harness moved the purple wire off it's short to ground for the mean time. Go out at night and use a flashlight to inspect that wire. The rub through will be fresh and shiny metal compared to everything else, and will be very reflective.
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    89 Suburban 5.7 blowing fuse #5 GAGE/IDLE

    Mine was rubbed through on this bracket right above the TCC connector in the photo. You might just move the harness a little to make sure it isn't touching metal and see if that helps you narrow down the location. I think there is also a bracket by the firewall where the harness leaves the...
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    89 Suburban 5.7 blowing fuse #5 GAGE/IDLE

    by the transmission. driver side. rubbed on the bracket before the TCC solenoid switch.
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    89 Suburban 5.7 blowing fuse #5 GAGE/IDLE

    https://www.gmsquarebody.com/threads/1990-suburban-gage-idle-fuse-circuit-shorted.44558/#post-941850
  22. G

    89-91 LMC headlight upgrade

    near stock.
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    89-91 LMC headlight upgrade

    the best I can do in my urban area without driving farther. maybe I'll update with some pics next time I am out at the farm. one Pic on the road and another one shooting across the street at the neighbors fence and garage (different distances from the truck) to give an idea about the cutoff. low...
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    89-91 LMC headlight upgrade

    bringing up an old post for an update. I installed some Diode Dynamics SL2 Pro LED 9006 bulbs in the low beam LMC housings. It is a very impressive amount of light with a solid cutoff, like modern car lighting. The LMC housings with the 9005xs in the high beams (what they come with) and the...
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    Cleaning Fuel Injectors

    I'd run your favorite fuel system cleaner through the gas tank and not worry too much about it. The gas mileage wasn't great to begin with. My 1990 4x4 burb 350tbi is no spring chicken with 235k miles, but I keep things well tuned up and maintained. I get 12.5-13.5mpg generally cruising at...

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