Recent content by gmbellew

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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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