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    Wipers not going back down

    the wiper linkage is attached to the motor out 180 degrees. disconnect the linkage, move the wipers down, turn the switch on and off so the motor parks, reattach linkage to motor with wiper in park position and motor in park position. only 1 time does a person install a new wiper motor without...
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    Source for rear AC fittings?

    id definitely disconnect the rear expansion valve when flushing. and while it is out, throw it in the freezer and make sure it closes and operates properly.
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    '88 350 TBI Engine Noises and Idle

    if you measured the vacuum at 8inhg at idle, that is way too low. also given you suddenly lost engine power and it wouldn't idle, id suspect a fairly substantial vacuum leak from somewhere...
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    '88 350 TBI Engine Noises and Idle

    hard to say. the code may have a clue to follow...let us know what it is. I did have a TCC solenoid go bad. it had a crack. had no issues if the converter never locked. but once it locked, it wouldn't fully unlock and idle was very surgey and rough until i turned it off and restarted the truck.
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    Help! 1991 Suburban cuts out suddenly, immediately restarts. Tried everything.

    sounds electrical and something in the ignition system or computer controls. has it ever popped either of the ECM fuses or set the service engine light? are the ICM wires in good condition, loomed, and not touching plug wires?
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    350tbi stalls for fuel cutoff

    Closed loop is when the ECM is using feedback from the O2 sensor to adjust fuel trims. Open loop is when the ECM is only using CTS, TPS, MAP to adjust fuel trims. It's a mode of ECM operation. If the fuel pump relay is bad, the redundant power from the oil pressure switch will go through to...
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    350tbi stalls for fuel cutoff

    just what the manual says....that there is a time component to when closed loop goes into effect in addition to engine temp and O2 oscillations.
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    1990 R2500 Suburban speedometer not working

    1990, I think, is VSS. but i am not 100% on a 2500. if it is VSS and no codes being thrown and cruise works i would strongly suspect the speedo gauge itself is the problem. because if the VSS were not sending the signal to the ECM, and code would be thrown.
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    350tbi stalls for fuel cutoff

    I meant exactly 5min after a cold start. not that the engine was cold. sorry.
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    Front center seat, center console upgrade, 3rd seat, 6th seat, jump seat

    Thats a great idea and awesome fit! How would that fit in a burb? I was thinking the burb seats are bigger and wider than the blazer seats?
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    350tbi stalls for fuel cutoff

    Closed loop is a function of temperature and also some minimum time threshold. If it stalls at nearly exactly 5min on a cold engine, it could be the time. Next time it stalls, give it some pedal to the floor while you crank. That is clear flood mode, and slows the injectors down in case it is...
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    350tbi stalls for fuel cutoff

    https://www.gmsquarebody.com/threads/1973-1991-service-manuals.14499/ Stalling after 5min of idle could be when it hits closed loop and starts using the O2 sensor to fine-tune fueling. Maybe the O2 has an issue and it is either going rich or lean enough to stall out? Do you have any sort of...
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    87’ 350 tbi hot start issue

    Yessir
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    87’ 350 tbi hot start issue

    There should already be a test lead off the relay to apply 12v that will turn on the fuel pump and bypass the relay. Red wire, if I remember right.
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    1987 454 TBI stalls at idle after a short time

    how does the reading at the O2 sensor, if you backprobe it, compare to winALDL? wondering if you are probing the wrong pin? some 454, I think, were set up to idle in open loop. that wouldn't explain why it wouldn't hit closed loop when off idle, especially if winALDL is showing the O2 voltage...
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    TBI spare parts

    there should be a flex line downstream of the filter. i just flexed it to install a similar adapter from actron and I've left it in place for a couple years now with no issues. i did find a threaded cap at the parts store to fit the test port to keep it clean.
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    JamesSam's TBI Code 21 Test Thread

    id say fire it up and run it with the new TPS.
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    TBI spare parts

    there are only a few TBI specific things i carry that are easy fixes that might leave me stranded - ICM, cap, rotor, and fuel pump relay. I also carry a couple old plug wires, old/spare radiator hose, fluids, basic tools, tire patch kit, small air compressor, multimeter, and maybe a few things I...
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    Best Replacement for TBI 350 Oil Cooler lines?

    they looked good, but i just stuffed them in the garage. I thought one of them was weeping, but turned out the oil was coming from higher up. so I am saving them for a rainy day if the old lines ever do go bad.
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    Best Replacement for TBI 350 Oil Cooler lines?

    I bought some from summit a couple years ago. Sunsong brand, i think.
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    What have you done to your square lately??

    yeah, the data report out speed is about every 0.8 seconds, so it is pretty slow. the actual ECM is making changes much faster. so it does help, but it isn't a perfect diagnostic tool. as long as you don't enter diagnostic mode on the cable/scanner (it should come with directions of some sort...
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    What have you done to your square lately??

    you really need something like this - https://obd2allinone.com/aldl.asp it's not really that difficult to jump in to this OBD1 stuff. I knew about nothing a few years ago. but between being able to look at the GM manuals (particularly the emissions and drivability manual) in the reference...
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    What have you done to your square lately??

    you need a voltmeter at a minimum. getting a ALDL cable and finding a way to see data with tunerpro on a computer or ALDLDroid on your phone to know what the computer is doing would be a huge bonus. most shops won't be able to read OBD1 computer....so they will be hit or miss unless you luck out...
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    What have you done to your square lately??

    0.3 is a little too low. anywhere from 0.5 to as high as 1.0 or so is fine for the low end, with 0.5-0.7 as the sweet spot. high end anything about low 4s to 5.0v is fine.
  25. G

    What have you done to your square lately??

    Without a voltmeter you are shooting in the dark a little bit. But you'd want to bend it toward the cab, I think, to reduce the voltage at idle.

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