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  1. G

    Best Replacement for TBI 350 Oil Cooler lines?

    I bought some from summit a couple years ago. Sunsong brand, i think.
  2. G

    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...
  3. G

    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...
  4. G

    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...
  5. G

    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.
  6. 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.
  7. G

    What have you done to your square lately??

    Code 21 is high TPS voltage (>1.25v at idle). If you opened the throttle enough with the min air screw, it could be the TPS voltage is >1.25 at idle. If the idle RPM is good, and the IAC is less than 30 (warmed up fully) with how you have the min air screw, then bend the tab on the TPS to get...
  8. G

    Spare tire mounted under the front bumper?

    several companies make hitch mounted swing away carriers also. that way no permanent mods to the bumper or metal
  9. G

    Stock Cold air intake performance upgrades

    it's hard to imagine underhood temps and heat soak into the thermac doesn't keep it in "fresh air delivery" mode after the engine is up to temp (135 deg f underhood air temp). it seems to me that the system is meant to warm up the engine faster for emissions and, in circumstances when driving in...
  10. G

    rear tailgate power window motor Blazer/suburban

    Next time I have a window failure of some sort, I plan to use them also. I might even just jump to the 4 windows plus the tailgate window on the burb. Might turn out to be $1500 well spent! Did you use the factory harness and switches?
  11. G

    rear tailgate power window motor Blazer/suburban

    https://www.nu-relics.com/category-s/558.htm
  12. G

    Source for rear AC fittings?

    that's correct
  13. G

    Replacing the TBI engine, suggested upgrades or changes?

    grab the PROM from the 5.7. you will need it. I also assume you are using the TBI from the 350 with the 350 injectors? I think 305 and 350 trucks used the same ECM, just different PROMs. I'd keep the 350 stock cam. straying too far results in the need to get a custom tune.
  14. G

    1990 TBI misfire/popping exhaust

    yeah, inspecting the cap excess carbon is a good idea. and I agree on not skimping on ignition components!
  15. G

    1990 TBI misfire/popping exhaust

    might double check to make sure you have the firing order correct.
  16. G

    1990 TBI misfire/popping exhaust

    EGR is closed at idle. so unplugging the vac to EGR doesn't do anything at idle. manually opening the EGR, or using a mityvac to open the EGR, should cause it to bog at idle. I'd hit up the fuel and emissions manual and look at the "symptom" charts for backfire and misfire. I think section 2...
  17. G

    Show your daily driver

    also a lot more interior space compared to a 2 door
  18. G

    O2 Sensor

    uh- I did read it. this is what you wrote - "It doesnt take much heat to operate the O2S, they all should have internal heaters. Is the heater working?" i don't consider the exhaust heat to be an "internal heater" but I am also not a drunk mechanic. maybe that's where I am missing...
  19. G

    O2 Sensor

    Single wire O2 has no heater and relies on exhaust to heat it up.
  20. G

    LED exterior light conversion! not going well :(

    I just used LED on headlights and auxillary fog lights where it really matters and kept the rest incandescent. I have seen too many threads about issues LEDs in turn signals to even want to try it elsewhere
  21. G

    What have you done to your square lately??

    that's all it does to attach. move the throttle to WOT with your hand and see if the cable appears tight
  22. G

    What have you done to your square lately??

    just move the throttle all the way to WOT at the tbi. if the cable is tight like a guitar string, you should be fine. it may click a time or too if it was too tight before as it properly adjusts
  23. G

    What have you done to your square lately??

    that black thing a few inches past the cable end is the clip. reattach it....quickly. TV cable is very important to the transmission functioning and not burning up. that's why I asked about it back in post 22,658 of this thread.
  24. G

    Headers and O2 sensor

    If you're running good as is, and with the limitations of TBI, I'd just leave the exhaust manifolds on there. Headers wont add much from what I've read. Look at a new exhaust coming off the manifolds if you need a new exhaust system.
  25. G

    What have you done to your square lately??

    TPS position only affects TCC lockup on a 4L60 with TBI. Shifts are very much controlled by the TV cable. I'd ask the shop if they made any adjustments to it when they tightened the intake manifold.

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