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  1. G

    Fluid Changes

    Not in consumption, because I lose all my oil through the valve stem seals :). I switched bc the oil pressure at hot idle was a little low compared to a few years ago. Used to idle around 28-30psi and was idling at 20-22psi this summer. After a couple oil change intervals, it does seem to be...
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    Fluid Changes

    That's what I started running a couple changes ago. I will say the oil comes out DIRTY at 3k miles.....it must be doing something
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    ‘87 454 TBI, NO Fuel spray, HAS fuel pressure, has 12v @ injectors, has spark

    surprised it would run on fluid if ecmb has no power at the fuse panel? ecmb powers the ecm and the fuel pump, that's it. Orange wire in the harness, goes to ECM and fuel pump relay and splices into the oil pressure switch for a backup to the fuel pump relay. if the fuel pump is running, but...
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    1987 Silverado fuel issue

    87 might be different. My 90 burb has the oil pressure switch and the pressure reading for the gauge all in one behind the distributor.
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    1995 S10 est wire location?

    https://blazerforum.com/forum/2nd-generation-s-series-1995-2005-tech-41/timing-disable-wire-connection-84209/
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    1995 S10 est wire location?

    Didn't they move that inside the cab, maybe under the dash or behind the glove box, in the later TBIs?
  7. G

    Something killing battery

    it might be hooked to constant power instead of ignition power....
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    ‘87 454 TBI, NO Fuel spray, HAS fuel pressure, has 12v @ injectors, has spark

    if it is the original cluster and the wiring hasn't been hacked to pieces there is a check engine light. on my 1990, it is bottom right on speedometer i think. it could be different on yours. use Chart A1 to diagnose the lack of a check engine light. it could be a bad bulb or maybe a PO got...
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    ‘87 454 TBI, NO Fuel spray, HAS fuel pressure, has 12v @ injectors, has spark

    right here on this website! https://www.gmsquarebody.com/threads/1973-1991-service-manuals.14499/
  10. G

    ‘87 454 TBI, NO Fuel spray, HAS fuel pressure, has 12v @ injectors, has spark

    I'd run through the diagnostics to be sure (i think you need chart A4 from the emissions and drivability manual). but my money is still on the ICM being bad.
  11. G

    ‘87 454 TBI, NO Fuel spray, HAS fuel pressure, has 12v @ injectors, has spark

    I believe it is the reverse - 400rpm and below the ICM is controling the timing and above 400rpm the ECM is controling the timing.
  12. G

    ‘87 454 TBI, NO Fuel spray, HAS fuel pressure, has 12v @ injectors, has spark

    agree - you could run through the diagnostics, but it sure sounds like the ICM based on having spark and fuel pressure.
  13. G

    GMT400 wipers not returning to rest

    unless something is loose in the linkage, it is likely a park switch problem. not sure how they are set up on that style. but I bet it is somehow integral to the motor.
  14. G

    O2 Sensor Testing

    As far as I know PROMs are engine specific. Might be close enough to run, but certainly not as well as if the PROM is correct for the engine. TBI can only compensate so much also depends on if the injectors were swapped to 350 injectors, or if the 305 injectors were used. if a 350 was...
  15. G

    O2 Sensor Testing

    did you put in the correct PROM for the new engine in the ECM? if not. I'd start there. going from 305 to 350 and not changing thr PROM could cause all sorts of issues.
  16. G

    Bulb with black plastic wire

    might be for the HVAC controls if it has a bulb attached and doesn't have a spot in the cluster.
  17. G

    Intermittent wipers

    the intermittent is controlled by a pulse module that plugs into either side of the wiper harness at the base of the steering column. not sure if this can be readily added, depends on how PO modified the switch location. not parking sounds like a park switch issue in the motor itself.
  18. G

    Wiper trouble

    might be a mouse has chewed some wires and things are electrically connected that shouldn't be...
  19. G

    New engine installed - need TBI timing/idle help

    post #2 nailed it with the correct info
  20. G

    Need help with regards rear ac

    I've not had the passenger side panel fully off, only dropped the AC panel to replace the TXV and clean the rear fan. but I know the drain for the rear system goes through that area. could it be that?
  21. G

    Pass power window

    find the wiring or service manual for your year in the reference manual. there is diagnostics to follow to narrow down the problem. if it worked before you added the LMC kit (I assume a relay kit) I'd suspect that an installation mistake may have been made or a new part is bad. it'd be hard to...
  22. G

    Whirling Sound While AC is Turned On, Matches Up With RPM

    AC work on a square, where everything is accessible, isn't too bad. I'd also replace the orifice tube and accumulator/drier while the system is open. As long as the compressor hasn't failed and sent particles throughout the system, you shouldn't need to flush. But if you do need to flush, you...
  23. G

    87 V10 Custom Deluxe TBI Issues

    https://www.gmsquarebody.com/forums/the-squarebody-reference-library.52/
  24. G

    87 V10 Custom Deluxe TBI Issues

    I'd start here and see where it takes you. the manuals are in the Reference Library.
  25. G

    Cab leaking

    if water is sweeping in the kick plates, make sure you clean any debris from the cowl drain exit that is behind the front fender...when debris collects in that area, it builds up water faster than it can drain out and it will seep in the kick plate area.

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