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  1. G

    Help me determine location for these wires

    1 looks like the wire to test the fuel pump with 12v that bypasses the relay. 2 I am not sure. I might run out and check my 90 burb in a bit and look around. 3 looks like the tach signal off the distributor. 4 looks like the temp sensor for the cluster. should go between plugs 1 and 3 in the...
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    ‘91 Suburban A/C Cooling Help

    I've messed with mine a bit, and i think the door is warped. So the vent settings are more like bilevel. Bilevel is like 75% floor. For AC, having a vent/floor split really is OK as it cools off high and low up front and the rear comes in high from the back. On heat, it seals up tight and only...
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    Heat/AC Blend Doors

    yes, make sure the vac lines go where they are supposed to go.
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    Started then died. Started but feather the throttle

    could be module. could be a wiring harness issue, could be stray voltage from a cracked distributor cap, could be plug wire sitting on ICM wire. but code 42 means an issue in the EST (white) wire or the bypass (tan/black) wire (open, short, seeing voltages it shouldnt) or the connector at the...
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    Heat/AC Blend Doors

    you might have the vacuum lines on the wrong ports at the hvac controls?
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    Now we move into desperation territory (seeking advice)...

    I was thinking to ONLY power cycle the fuel pump instead of cycling the key. Just trying to narrow it down. link to new ECM above. that's the same vendor I got my spare ECM from when I thought maybe my ECM was bad.
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    Now we move into desperation territory (seeking advice)...

    https://www.ebay.com/itm/224043676234?itmmeta=01J0PXNCWSQZ586H49FREZ5BXA&hash=item342a0b324a:g:4jcAAOSwSbRfd06A you will just have to swap your PROM to the new ECM.
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    Started then died. Started but feather the throttle

    Feathered the gas or gave it a lot of pedal to get it to start? Pedal down is "clear flood mode". Could be a leaking injector or something if you had the pedal down.
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    Now we move into desperation territory (seeking advice)...

    Might try not cycling the key, but instead disconnecting and reconnecting the relay for the fuel pump without touching the key. Maybe it is some fuel pump weirdness going on? That would just take the power off the fuel pump and only reset it, without resetting the ECM? I don't remember if you...
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    1990 Suburban oil pressure gauge only reads 30 PSI

    Did you pull the temp gauge and reseat it? Might just be another issue of bad contact between the gauge and the cluster housing
  11. G

    1987 Chevy v10 fires but won't stay running

    The manual says to cycle the key to on for 10sec and off for 5 sec and the start to reset the IAC. I've had better luck jumpering A and B on the ALDL and putting key to ON for 20-30 sec to let the IAC close all the way for resertinf the IAC. Pulling it out manually and then reinstalling seems to...
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    ‘91 Suburban A/C Cooling Help

    Even with the blend door all the way closed, there is still a lot of residual heat build up in the core and the hvac box. Vent setting cruising down the highway I see at least a 5 degree bump in temp from outside to vent. I've thought about installing a couple ball valves and a bypass, but was...
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    Now we move into desperation territory (seeking advice)...

    I don't know any more than what I read on their website from doing some research. But if you just want to see what the ECM sees at the sensors, how it is adjusting fuel, RPM, etc, I've been pretty darn pleased with ALDLDroid app on my phone and a Bluetooth ALDL cable from 1320 electronics.
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    Now we move into desperation territory (seeking advice)...

    You should be able to source a new ECM and swap over your PROM chip. Check Ebay. I've bought a spare for my 350TBI from there. Make sure you get the correct ECM for your year/engine. Also you could look at EBL flash II if you are looking to do more tuning and/or want a faster computer read out.
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    ‘91 Suburban A/C Cooling Help

    measure the ambient temp in front of the truck. in my limited AC experience on my burb, the engine really puts out a lot heat and the ambient temp around the engine bay might be 90-100 deg when it is 78 deg outside...
  16. G

    ‘91 Suburban A/C Cooling Help

    Biggest thing that affects ac in my burb is whether the truck has been baking in the sun for hours or parked in the shade when I get in. It takes a good long while to overcome the heat soaked metal inside the cab. That being said, I run a sanden with the rest of the stock components and a small...
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    TBI symptoms changed (new thread to reflect new problems)

    Working in that area sucks. A top creeper would be ideal. But I usually climb in and put my left foot on the passenger side frame rail and right foot back by the core support and lean in. Most of my weight is supported by the left foot. It's not comfy, but gets the job done.
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    TBI symptoms changed (new thread to reflect new problems)

    I'd let the engine get up to temp, and at idle, start wiggling and manipulating the harness and see if you can reproduce the issue. If not, I'd spray some light water mist from a bottle around the cap and ICM and see if you get any sparks. If that looks good, I'd be testing for continuity on...
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    TBI symptoms changed (new thread to reflect new problems)

    I think the 2 engine grounds for the ECM are the back of the block on the passenger side and by the thermostat and CTS in the front of the intake manifold
  20. G

    TBI symptoms changed (new thread to reflect new problems)

    code 42 is fairly limited, in that it is an issue with the ICM, either in the EST (white) or Bypass (tan/black) wires. they went open or saw unexpected voltage spikes. I'd be looking hard at the ICM connector itself, the wire from the external coil to the cap for signs of spark leaving the...
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    87' R10 TBI 350 shuts off when driving. HeLP

    All the GM manuals are in the reference library on this forum. check the home page.
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    87' R10 TBI 350 shuts off when driving. HeLP

    does it die suddenly, or die sputtering like it ran out of fuel? does your SES light work, any stored codes? might try to diagnose the ignition system next time it happens before you cycle the key? run through the check in section 6 of the emissions and drivability manual.
  23. G

    87' R10 TBI 350 shuts off when driving. HeLP

    I'd be looking hard at the new ICM or some sort of electro interference from a cracked distributor cap or a plug wire touching an ICM or any of the ECM sensor wires. With it doing at idle or deceleration (throttle off, slows it down) it might me something that is making contact under certain...
  24. G

    Engine died when driving and won't start - Coil melted

    spare parts I carry- bulbs, radiator hoses, ICM, external coil, couple old plug wires swapped every 30k miles, timing light, cap/rotor from previous maintenance change swapped every 30k miles, swapped every 30k miles, small air compressor, tire plugs, basic tools, zip ties, electrical tape...
  25. G

    A/C only works when driving!?

    he said he could hear the compressor cycling at idle, so seems like it is working? although if it is short cycling, it might be low on charge.

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