Recent content by gmbellew

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    1985 K10 Wiper Issues

    see if this helps
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    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...
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    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.
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    87' R10 TBI 350 shuts off when driving. HeLP

    I am guessing that's your problem....
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    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.
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    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?
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    87' R10 TBI 350 shuts off when driving. HeLP

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