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  1. G

    1985 K10 Wiper Issues

    see if this helps
  2. G

    1987 TBI Rough Idle Help!

    I figured your fuel injection system had a computer readout? Rich is O2 values steadily near .8-.9v and the computer would be reducing the short term and long term fuel trims.
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    12v ignition switch source

    I am curious about this. Pretty sure my TBI has 12v to fuel pump always when the engine is running. Is that an issue?
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    1987 TBI Rough Idle Help!

    I've had new AC Delco wires last less than 2 years before they started letting the spark out. Just because it was recently replaced doesn't mean it is still good. With no codes being thrown and nothing odd in the sensor data (I assume), you have to start looking at other things that could cause...
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    1987 TBI Rough Idle Help!

    Higher RPM can mask other issues. I'd check plug wires for cracks, especially the wire from coil to cap. I'd check the distributor cap for cracks. I'd also check to be sure your exhaust isn't plugged up. Also check to make sure the ICM connector is in good shape, and check to make sure the...
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    1985 K10 Wiper Issues

    you should be able to bypass the delay module. the harness will plug into itself. aside from that, I'd hit up the reference library for the wiring diagram or maybe the service manual and check out the diagnostics for inop wipers. my guess is you will be busy with the multi meter figuring it...
  7. G

    87' R10 TBI 350 shuts off when driving. HeLP

    I try to only use AC Delco parts for any engine sensor or management, including the ICM.
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    87' R10 TBI 350 shuts off when driving. HeLP

    injectors ground through the ECM. follow the charts I posted earlier. check for spark. if you don't have spark, diagnose that. if you have spark, then diagnose the injectors not firing.
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    87' R10 TBI 350 shuts off when driving. HeLP

    Sounds like you are on the right track. I've had my 90 suburban for 6 years and just now feel like I have all those sorts of issues sorted out. There is a lot of things just getting to start going wrong when it's all 35yrs old, even if it has been well taken care of.
  10. G

    87' R10 TBI 350 shuts off when driving. HeLP

    I am guessing that's your problem....
  11. G

    87' R10 TBI 350 shuts off when driving. HeLP

    check for spark while cranking. if you have no spark, follow the ignition check. if you have spark, follow the injector check chart A4 this is starting to smell like an ICM going bad to me, a bad connection at the ICM, or maybe a ICM harness wire that has rubbed through somewhere.
  12. G

    87' R10 TBI 350 shuts off when driving. HeLP

    fuel pump wiring is on ECMB fuse. probably have a short to ground in the wiring for that side?
  13. G

    87' R10 TBI 350 shuts off when driving. HeLP

    did it at least flash 12 so you know the SES light is working?
  14. G

    87' R10 TBI 350 shuts off when driving. HeLP

    I've had shutoff issues on my 90, for a variety of causes. Usually I have a code or a fuse blown to help diagnose. Often a blown fuse is from a short to ground somewhere in a critical ECM circuit (ECMB or ECMI). I've had bad plug wires arcing to ICM wires causing this issue, usually it will...
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    87' R10 TBI 350 shuts off when driving. HeLP

    The oil pressure switch doesn't turn off the fuel pump if the pressure gets low. But it does serve as a backup to the fuel pump relay to send power to the fuel pump once the pressure gets to 2 or 3 psi from extended cranking or allows you to keep driving if the engine is already running. That...
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    Engine cranks, but only starts after letting off key? - I'm perplexed

    Heat can play an issue. Example - my wiper washer switch is inop below about 50 degrees. When the switch is warmer than that, it works just fine. When it gets cold, something must be contracting enough to lose contact. Because I can jumper the washer pump to ground at the delay module and it...
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    87' R10 TBI 350 shuts off when driving. HeLP

    does it ever throw a code? are any codes stored?
  18. G

    Engine cranks, but only starts after letting off key? - I'm perplexed

    ignition switch issue or maybe an issue with the crank signal wire?
  19. G

    Poping fuses when ac controls are on

    I am not clear on when the issue started, when parts were replaced, or if they corrected the issue. But seems likely there is a short to ground somewhere with the blower motor wiring because the compressor doesn't kick on in the economy settings and the air direction controls are all vacuum...
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    Anybody modify the 4x10 speaker mounts in the back?

    The dash speakers were replaced 5 years ago, with some Kenwoods I think. They haven't held up great, already a little static in the driverside dash speaker. If I replace them again, I'll go with kicker 3.5. Overall things sound fine. Windows down highway cruising is where the system really lets...
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    Anybody modify the 4x10 speaker mounts in the back?

    nope. they dropped right in.
  22. G

    1987 TBI tach install

    Should be a couple places in the fuse panel labeled "ign" to tap. Or use a relay and tap into anything that gets power with ign turned to ON.
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    1987 TBI tach install

    that should not matter too much as long as it is an ign power source.
  24. G

    1987 TBI tach install

    that's definitely the tach wire
  25. G

    31x10.5 with 3:73 gears.700R4 trans. What RPM will I have at 70MPH?

    I have 33x10.5 (spec is 32.5in, probably actually 32in, or a little less rolling diameter), 3.73 ratio, and a 700r4. my RPM at 70mph is about 1950rpm and at 75mph is about 2100rpm for flat land cruising. Using the grimjeeper calculator, 31in tires (rolling diameter might be 30.5in?), the rpms...

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