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  1. chengny

    Need a new exhaust

    My 30 has a GVWR of - I think 10500 - and it came with them. Ah who knows? Yeah I love those manifolds too.
  2. chengny

    Need a new exhaust

    85 & 86 K30's (as well as K20's with the HD5/FED emissions package) got really nice exhaust systems. I'm on my third 86 - two were 20's and my current is a 30 - and they all have had dual 2 1/2" pipes. They were all over a certain GVRW (8500 lb. IIRC) and so they were essentially free of most...
  3. chengny

    Motor Dies While Driving

    I would have to agree - that it is an electrical problem associated with the ignition system. But in my (limited) experience, electronic components don't keep coming back to life. Try this easy diagnostic: It will tell you whether the distributor has an internal problem - or the issue is loss...
  4. chengny

    Big Block Pictures? Under the hood?

    The attachments below are from the 1973 service manual and the 73-78 parts lists and dwgs. They might be of some help:
  5. chengny

    A/C delete

    Much less involved than the wiring used with an AC system: Just the four connectors shown above. They go as follows: 1. To the blower motor 2. To the heater resistor stack 3. To the blower speed switch 4. Power in to the speed switch (from the fuse block). The other half of that...
  6. chengny

    Let's talk oil

    Most recent - 5 years old - spec sheets I have for the Mobil 1 product line:
  7. chengny

    Cruise control release switch

    Description of operation, diagnostic procedures and wiring diagram:
  8. chengny

    No high speed fan/blower

    Yeah, you got it right. Here is some additional info: And the diagram specific to your model year - it's identical to the stuff above:
  9. chengny

    Engine wiring

    The YEL coming up from the solenoid is unnecessary - you can remove it. There is resistance in the PNK/BLK wire that comes from the ignition switch, goes through the firewall and supplies the coil primary. But, I don't believe it's like an actual resistor that is spliced into the wire. I'm...
  10. chengny

    Right side wiring harness

    It is the EST harness. The 4 pin plug would go to an EST driven distributor and the 2 pin lug would go to the tip-in switch. The tip-in (if it were still there) would be mounted where indicated by the yellow circles: Dike off the engine side of the harness at the firewall, pull the other side...
  11. chengny

    What is this??

    Yep, "seat belt warning buzzer and timer". Should be connected to a BLK/WHT (seat belt retractor switch), a YEL (dash warning light), a PNK/BLK (power in) and a BLK (ground).
  12. chengny

    Instrument cluster up grade.

    Here's one for you Mr. Nail; "If it ain't stock, take a walk!"
  13. chengny

    Dash brake light keeps coming on

    I'm not too familiar with the earlier model trucks. Most of what I know is just what I learn from the service manuals/wiring diagrams - so consider the source when reading the following. From what I can see (in model year 1978), it doesn't look like the e-brake had a switch that could cause...
  14. chengny

    I need help with fuel tanks on my 87 dual tank

    I think the posts above are in reference to TBI systems, with in tank pumps and transfer valves using a 5 wire control circuit. Like this:
  15. chengny

    Windshield wiper/washer issues

    You probably know all this, but anyway: There is no single ground lead for the wiper motor - the high and low speed windings are connected to their associated brushes. Each of those brushes is ultimately connected to ground via the control switch. The position of the control switch determines...
  16. chengny

    knob removal

    You're talking about these right? If so, there is no trick to getting them off. You just have to go Neanderthal on their asses. I wrap them with a little piece of rag (to protect the finish), grab on with a pair of Channelocks and then pull/wiggle on it. It will eventually pop off. Wiggle it...
  17. chengny

    Pedel goes to floor

    Looking closely at your bleeding procedure. That could be the problem - unless I'm not reading this right: Up closed bleeder down opened bleeder. You don't want to allow the pedal to return to the top with the bleeder open. As the brake pedal rises, the piston in the MC retracts. This creates...
  18. chengny

    Seat belt help

    John is right. Pre-tensioners contain a pyrotechnical charge - detonated by the SRS control module along with the airbags - which drives a piston. It looks kind of like a large caliber bullet inside of a tube. The pyrotechnical charge is under/behind the piston. When the charge is detonated, the...
  19. chengny

    Delay wiper switch electrical test

    Ah haha, I knew you were going to ask that. Usually, just verifying a significant change in resistance as the rheostat is stroked from stop to stop, is enough to call it good. But I'll look around - I think somebody might have come up with an actual ohmic value a while ago.
  20. chengny

    I need help with fuel tanks on my 87 dual tank

    By any chance, when your father toggled the dash switch left to right - did you verify that power shifted between the TAN & GRA leads? If so, you have proven; the switch is good, the wiring to the pumps/valve is good and both pumps will deliver gas to the transfer valve. The output from the...
  21. chengny

    Delay wiper questions

    You should have everything you need. The wiper motor and harness are the same for both standard and intermittent wipers. Currently the 6 pin connector on the harness plugs directly into the standard style switch. The new switch/module are connected like this: Just pull the old standard...
  22. chengny

    Delay wiper switch electrical test

    Power is supplied directly from the fuse block - and independently of the wiper switch - to both the washer pump and wiper motor (on a pair of WHT 93 leads). All the other leads - except the BRN's - are variously connected to ground as needed via the switch. An intermittent wiper system has 7...
  23. chengny

    perfectly good speedo cable trashed

    Dry, dry, dry - but that's GD funny, I don't care who you are. I spit out a little beer on that one.
  24. chengny

    I need help with fuel tanks on my 87 dual tank

    Tks Rusty, and same to you and yours.
  25. chengny

    No power to dash!! hELP

    Thanks.

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