Recent content by johnsonmtz

  1. J

    Single Purple Wire in engine bay 1989 K1500

    ICM was the culprit. I installed a new one and the engine fired immediately. Prior to that I had zero spark. I didn’t see any evidence of pinched wires or impact against the firewall so maybe it’s just coincidence. I did recently have an issue of the battery frequently draining. That was...
  2. J

    Single Purple Wire in engine bay 1989 K1500

    That's the route I'm thinking is the ICM was possibly damaged. I'd like to test it to confirm before just replacing, but I also know these are famous for taking a dive, so it could also have just been time for it to flake out. I installed a completely new distributor 3 years ago when I...
  3. J

    Single Purple Wire in engine bay 1989 K1500

    That's what I figured. Re-reading your post on the 4.3L using two but GM using a universal harness makes a lot of sense. KISS indeed.
  4. J

    Single Purple Wire in engine bay 1989 K1500

    Gotcha, now I don't feel quite as crazy. Is there any advantage to running a 2nd O2 sensor? I didn't think the PCM on these older ODB1 would do anything with data from more than one sensor.
  5. J

    Single Purple Wire in engine bay 1989 K1500

    I can't see any stripes on the wire, it looks solid purple to me unless they used a really dark color for pink. I have the manuals but I'm having a hard time tracking down a PNK/BLK color wire.
  6. J

    Single Purple Wire in engine bay 1989 K1500

    It sure could be the O2. There is a single wire connector on the driver side coming out of the harness that connects with the O2 sensor wire. Is there another connection elsewhere? I was certain these only had a single O2 sensor on the driver side manifold, but is there a provision for a 2nd...
  7. J

    Single Purple Wire in engine bay 1989 K1500

    I'm tracking down a no spark condition on my 1989 K1500 5.7L . While probing around the distributor I came across this single wire plug with a purple wire coming out of the main harness. For the life of me I can't find where this plugs into. I don't know that it has anything to do with my no...
  8. J

    Backlighting for Climate Control and 4X4 shifter always on

    This definitely falls outside the normal cause for electrical issues. But you’re right, never rule out the oddball reason for a problem.
  9. J

    Backlighting for Climate Control and 4X4 shifter always on

    Sorry it’s been so long but I want to wrap up this thread. I finally got a chance to pull out the fuse panel and see which wire was loose or bare that was causing the problem. Turns out, it was just a loose screw. The problem starting shortly after my son did some speaker work and I...
  10. J

    '89 700R4 - Rebuild or Install Reman?

    Got it, so in this case bigger really is better.
  11. J

    '89 700R4 - Rebuild or Install Reman?

    After the rebuild I do intend to tow boats with this truck. Mostly it will be my bass boat (2,500 lbs boat/trailer) and occassionally my runabout (4,500 lbs boat/trailer). Both have hydraulic surge brakes. I've seen opinions ranging on the 700R4 some say it isn't strong enough to tow a...
  12. J

    '89 700R4 - Rebuild or Install Reman?

    Thanks guys. Due to timing, my insanely busy schedule, and your advice I'm really leaning toward letting the shop do the rebuild even though it's quite a bit more money. Hipster is right, sure there's a warranty with the store, but that can be a fight. I have a very good relationship with the...
  13. J

    '89 700R4 - Rebuild or Install Reman?

    Thanks for the info Nick. Yes, I was concerned about the quality of the reman and what weaknesses they address during the rebuild. Originally the 2-3 clutch pack went out which was the reason for the rebuild 2 1/2 years ago. With the extended lead times back then and needing to get the truck...
  14. J

    '89 700R4 - Rebuild or Install Reman?

    I had the 700R4 in my sons '89 K1500 rebuilt about 2 1/2 years ago. This was during Covid of course and the shops I knew were over 2 months out on their schedule and reman trannies were back ordered too. I was recommended to a small shop in the area and he could get to the rebuild the...
  15. J

    Brake! Warning on '89 K1500

    I have an '89 K1500 with a constant BRAKE! warning on the dash. The truck had the classic mushy brake pedal and I read you can replace the OEM master cylinder with a unit from an '03 that will solve that issue. I made that swap a couple years ago and the pedal became very stiff after that, but...
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