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    Windshield Wiper Pulse Issue

    sounds like the park switch in the motor for OP. it's not intended to be serviceable, really. but if you are adventurous, it is possible. i'd replace the motor with a WAI motor if it isn't parking. if everything works properly except the delay, it is likely the pulse module. it too, is...
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    Has anyone relocated windshield wiper motor

    this might be a chose between "wipers" and "clean firewall" kind of a situation....
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    (solved) Tbi injector not pulsing on startup

    might be PCM because of the 4L80e transmission and it also controls the transmission. P - powertrain? the ECM only controls the engine. so yours is a PCM. my 1990 suburban with 350tbi amd 4l60 is an ECM. E - engine?
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    (solved) Tbi injector not pulsing on startup

    I believe they use ECM and PCM interchangeably. and yes behind the glove box is where it is located.
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    (solved) Tbi injector not pulsing on startup

    find the drivability and emissions manual for your rig and follow chart A-4 for injector diagnosis. in the reference library of this website
  6. G

    (solved) Tbi injector not pulsing on startup

    the injectors are pulse grounded by the ECM.
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    $40 well spent on OEM buzzer

    agreed. I like the buzzer for lights and key in the ignition.
  8. G

    Need Some Help Here

    after you jumper A and B, turn the key to "on". then the light will flash codes. otherwise solid advice. I'd also check the no start chart in the service manual
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    Rear Main Seal

    I did have a rear main seal leak once and Bars rear main seal repair did help slow it substantially before it was replaced. but I think OPs sudden increase in oil leaking is more likely a result of the recent intake manifold RnR. or at least that's the best guess until he tracks it down. I...
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    1989 Suburban Rear Passenger (Driver side) Door Tinted Glass

    I had a limb fall from a tree and smash mine last gear. I bought one of ebay to replace it.
  11. G

    Headlights flicker and radio cuts out when driving over a bump

    the 1990 wiring diagrams for the R/V suburban show the purple starter wire is 3mm, or 12ga
  12. G

    Heater Core how to

    do all the settings work properly? what is shown looks like "bi-level" setting. make sure the vacuum lines haven't been swapped around on the main control unit.
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    Cruise control works for a while then starts to lose speed

    highway cruising vacuum may be 10-12 inches at 75mph or so. I'd guess at 55mph it would be higher. check your lines and reservoir well. with the system off and holding vacuum, wiggle and jiggle the lines and see if it drops. if all is good there, you may have to take the solenoid apart and...
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    Do I need different gears with 33” tires and 4” lift

    detroit/eaton makes the truetrac. it is a gear driven posi and doesn't require additives. very good street manners and very good offroad. just not a true locker, so if you are crawling over rocks and hitting difficult trails and putting tires in the air, you may want something different...
  15. G

    Do I need different gears with 33” tires and 4” lift

    I'd get a truetrac to replace your factory G80 and don't forget you also have to regear the front on a 4x4.
  16. G

    Will a 1990 G20 grille and radiator support fit on my 1985 c10v

    wouldn't the easier swap be to the higher trim model grille from the same year with stacked headlights to get separate high and low beam?
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    Whats you gas mileage on your squarebody truck?

    driving at 70mph+ is what kills mileage the most on a squarebody. drive down the interstate at 60mph, if you can stand it, and your mileage will be significantly better.
  18. G

    TBI Issues

    it was spraying even with key "off"?
  19. G

    TBI Issues

    yes, constant hot and grounded by the ECM to pulse., but the injectors have separate wires off the ECM. so if they are both spraying they'd both have to be shorted to ground? most likely spot for that is at the air cleaner housing?
  20. G

    TBI Issues

    spraying by pulsing or just an even spray like the injectors are stuck open? the injectors shouldn't be pulsing unless the ECM gets a reference signal from the distributor with key on. maybe the injectors are stuck open, it is flooding and stalling, and still spraying fuel until the pressure in...
  21. G

    Heater Core how to

    Yeah, the heat will blow you out, even in my suburban! I rarely have to turn it up very much once the engine is warm or you will be sweating
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    Affordable AC Fix Squarebody Suburban W/ Rear AC

    If you can park in the shade, it makes a huge difference. It takes a lot of cooling power to overcome the giant heat soaked metal cab of a suburban. I have an aux fan that does help in stop and go. I have noticed that the heater core being hot all the time does heat up the under dash area...
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    Burning Oil At Start Ups

    looks like a 350 tbi suburban. I've always heard that blue smoke on start up is likely valve guide seals. but a little oil is seeping into the combustion chamber when it sits from somewhere.
  24. G

    TBI to Carb 1991 V2500

    ACDelco isn't routinely stocked at your local parts store, but is readily available online
  25. G

    No check engine light.

    Check ECMB and ECM1 fuses. If one is blown, you'll have to track down the short to ground.

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