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  1. 67GMC

    Combination valve

    It's also strange that there is no mentioning of how to adjust this "proportioning" valve in the service manual I have for my 1988. I'm wondering if the incorrect part is attached to the poster's truck. I don't think a proportioning valve is needed with ABS systems. From what I have read, on...
  2. 67GMC

    Combination valve

    I think you're agreeing with me. The ABS models have a combination valve (not a proportioning valve).
  3. 67GMC

    Combination valve

    I have a feeling that the proportioning valve is only for non-abs equipped trucks. Most of the trucks in that vintage had the Kelsey-Hayees RWAL brakes and have a combination valve. I think the proportioning valve is used to "balance" the brake pressure front to rear but that's not needed with...
  4. 67GMC

    PARKING BRAKE CABLE - '94 C2500 - WHICH? Non-removable Molded Pad Cover? Removable Rubber Pad Cover?

    Hmm-Steve is making me think now. I had almost no slack when I did mine a few months ago. Maybe I ordered the slightly shorter cables. My right drum was really tight because as I pulled the main cable to hook up to the front, I had to pull with vice grips to get it into that connector. 1"...
  5. 67GMC

    PARKING BRAKE CABLE - '94 C2500 - WHICH? Non-removable Molded Pad Cover? Removable Rubber Pad Cover?

    Good to hear your progress. You won't need to worry about the fins on the new parts. When you push them in, the fins will expand and lock in place. IT's designed not to be easily removed. I think there is a tool to compress them. I've seen some people cut the "fingers" off the fins one at a...
  6. 67GMC

    One brake drum locking

    I think so too. Might put it in order of 2, 1, 3
  7. 67GMC

    PARKING BRAKE CABLE - '94 C2500 - WHICH? Non-removable Molded Pad Cover? Removable Rubber Pad Cover?

    Sounds good. Just a note when you do the cables, it's sometimes easier to just cut them with bolt cutters instead of trying to getting them off if they're really rusty. They were almost welded on to my backing plates. Once you cut them, you don't have to fiddle around trying to flatten the...
  8. 67GMC

    PARKING BRAKE CABLE - '94 C2500 - WHICH? Non-removable Molded Pad Cover? Removable Rubber Pad Cover?

    I've done at least three parking brake cables on various vehicles. None were the same. None were as straight-forward as I would have like. A VW one was the closest to easy I could get. I find it better to replace every piece though. In the rust belt, you can't rely on just getting new...
  9. 67GMC

    PARKING BRAKE CABLE - '94 C2500 - WHICH? Non-removable Molded Pad Cover? Removable Rubber Pad Cover?

    Yeah-To me, it's definitely about the pad style on the pedal. If you look closely at the pictures though, there are definite differences in the parts so if you take yours off first, that will more or less give you the clue as to what you should order. Hoping that you have the correct part on...
  10. 67GMC

    Parking Brake Cable install

    OK. As others have pointed out, that Dorman Parking Brake cable Connecter/adjuster is a POS. While adjusting the brakes, I pushed down on the pedal and the adjusting nut pulled through. I cleaned up the original part, rusty as ever, put it back together and working good. I readjusted the...
  11. 67GMC

    Parking Brake Cable install

    OK-I have lockup on jackstands with trans engaged but parking brake pedal to the floor. My understanding for parking brake is just as described, it's supposed to hold the vehicle in place. It's not an emergency brake that will stop a moving truck. For our inspection here, the parking brake...
  12. 67GMC

    Seafoam OR Marvel Mystery oil?

    Probably a quadrajet carb too. I remember lots of those. Old folks would complain that they went on the highway and had no power. The secondary's were usually stuck from never opening up around town. Lots of 350s like that (Buick, Cutlasses etc). Easy fix though. Carb cleaner or just a...
  13. 67GMC

    Seafoam OR Marvel Mystery oil?

    I don't think my '88 has a MAF sensor. It's throttle body.
  14. 67GMC

    Parking Brake Cable install

    I finally got around to installing new parking brake cables. Its not as bad a thing as it has been on some of my cars. For advice, use all new parts. On my '88 in the rust belt, everything was rusted up (as usual). So new rear left and right cables, new equalizer etc. I didn't end up...
  15. 67GMC

    Seafoam OR Marvel Mystery oil?

    I've used both. My scan tool showed a bad O2 sensor and it was running in open loop most of the time. So I changed the O2 sensor. It seemed a little better. I did Seafoam a few days ago. No adverse effects but not much improvement to the bog down it had when cold. I just replaced all 8...
  16. 67GMC

    Bad IAC now? Won’t idle down with IAC unplugged and ALDL jumped

    Do you have access to a scan tool? I would be thinking about the O2 sensor. It could be trying to go into closed loop but doesn't like it and then goes back to open loop as it can't get the mixture right. I've got an MT2500 (the red brick). Had a similar issue. No SES light on but my truck...
  17. 67GMC

    What newer model gauge cluster will plug and play into a 1990 c1500

    Thanks for the link Desert Old Guy-I don't have a problem changing the switches to senders. I have seen a few of the clusters at swap meets. I'll pick one up and see what they look like.
  18. 67GMC

    What newer model gauge cluster will plug and play into a 1990 c1500

    I've got a similar question. My 88 has the idiot light instrument panel. I haven't pulled it. Will the wiring harness behind it work for an 88 with the full gauge package or do I need to replace the harness too. I've seen the instrument panels with tach and temp gauges and want a stock gauge...
  19. 67GMC

    1993 Sierra C1500 left front / right rear brakes stuck

    I'd have a good look under the truck. Trace the brake lines to make sure nothing broken and leaking if it's been sitting for a long time (especially on grass or farm field). My '88 was sitting out in a field for 3 years. Underneath, it looks like it was pulled off the Titanic. Every line...
  20. 67GMC

    Fuel Pump Connections

    I'll just update this in the hope that it helps someone else. For the braided lines, they terminate in female ends. They are not inverted flare compatible so I found a kit (Papco) that contains what is called a GM-Nut. These fittings are the same as what is on the pump ends, so they fit in...
  21. 67GMC

    Double Flaring Stainless

    The copper nickel is very good and easy to work. I've been using it a lot of the last few weeks on brake lines. I still put steel fuel lines (3/8 and 5/16) on. I will paint them as the cost gets high on the larger diameter lines. I believe if you look up the most of the flaring tools, they...
  22. 67GMC

    Fuel Pump Connections

    Still wrestling with this truck. Every brake line was rusted and breaking so did them all (flex lines too). I dropped the tank because for each gallon I put in, I had a gallon on the driveway over a few days. Dropped the tank, bought a southern tank (which turned out to be 34 gallons instead...
  23. 67GMC

    Scan Tool for 1992 K1500 OBD1

    For my newer vehicles, I bought an Autel ML619 scan tool off Amazon. It can troubleshoot the ABS and Air Bag systems as well as general OBD II stuff. Seems to work pretty well. I had to figure out the airbags on a KIA and a VW and it was well worth the $150 I paid for it.
  24. 67GMC

    Scan Tool for 1992 K1500 OBD1

    I picked up a Snap-on MT2500 a while back from a Snap-on dealer. They were still taking them back from garages as trade-ins for newer units. I think I paid $200 with all the modules and cables. It works on a lot of vehicles I have or had: 1987 Jeep Cherokee (Renix system), 1997 VW, 1988 GMC...
  25. 67GMC

    Fuel Pump Connections

    I found a company in Canada that's making them. Fineline Tube Products (https://www.finelinetubeproducts.com/). Not cheap though but they carry from the TBI to the filter, Filter to tank, tank to filter etc.

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