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  1. chengny

    TBI and low MPG advice

    What those guys above said makes my point. If the truck is running like you say, the ECM is almost surely throwing DTC's. But, if the bulb is burned out, you'd never know. Like Marty says, make a little jumper out of a paper clip bent into a U-shape. Turn the key to RUN (not started) and insert...
  2. chengny

    Please Help can't disconnect speedo cable

    You've done everything - to disconnect the cable - correctly. While the design of the spring clip (that secures the outer sheathing to the back of the cluster) has varied over time, the method of coupling the actual inner cable to the speedometer head has not. The end of the inner flexible...
  3. chengny

    HVAC speed control

    You're good to go. The same resistor stack was used with the C60 system from 73 -91 (P/N 336403). However, you are correct about the wiring colors - there was a change over the years. But it only effected the 12 volt power supply (the one at the top of the "pyramid"). It was YEL in...
  4. chengny

    TBI and low MPG advice

    It's hard sometimes to help a guy diagnose poor engine performance over the internet. Usually because the facts are delivered in dribs and drabs, but also the fact that you don't know him (or his capabilities) hinders the diagnostic procedure. So you often end up getting a broad spectrum of...
  5. chengny

    swapping doors power/manual

    If you have a good LH door (pre-loaded with PW/PL), I would consider upgrading the RH door to power as well. Running the RH section of the harness (through the A pillar, flexible conduit and then to the switches/motors) is way easier than doing the same thing on the LH side. Be sure to get the...
  6. chengny

    What is this cable for?

    That is a battery isolator. When two or more batteries are installed in your vehicle (and are powering different systems), use of a battery isolator allows them to share a common charging source while being independently discharged. Battery isolators are commonly used to maintain the...
  7. chengny

    You guys have oem part numbers???

    OEM P/N is 25515839 - real hard to source these days. These vendors show 1 and 2 in stock (respectively): Craig Motors -Napa Gm NAPA, CA 94559 800-224-8111 Dan'S Obsolete Gm Parts Chinook, MT 59523 406-357-2615 I wouldn't get your hopes up however - posted stock levels...
  8. chengny

    TBI and low MPG advice

    This might sound sarcastic but it has happened to me before: check the exhaust system for fur/acorns etc. If a vehicle sits idle for an extended period of time, it is not unheard of for mice to move in to the exhaust system and cause a restriction to gas flow. That condition can result in poor...
  9. chengny

    Dash brake light keeps coming on

    You might consider just pulling the wire off the BPC valve. If the warning light stops illuminating...then the problem is with the BPC valve. If it continues to come on...check for a short to ground somewhere in the associated wiring.
  10. chengny

    83 c10 proportioning unit line fittings

    The ends of the tubing are SAE double (45 degree) flare. Fitting sizes are shown below:
  11. chengny

    7 or 8

    The P/N for that switch is 1995216 (GM) or D1505A (Delco). It has 7 male terminal tabs. The wiring harness will have 8 sockets but only 6 wires coming in - the 2 sockets shown below will be empty Terminal 3 (black circle) is jumped to 5 and was reserved for an additional lighting...
  12. chengny

    Np 205 boot retainer

    The knob on my 86 K30 is consistent with the sample knob ob the far right - except no e-brake warning:
  13. chengny

    89-91 Lighting

    Are you talking about the halogen sealed beams? They are everywhere, try any auto parts store. For example - as suggested above - at O'reilly's for about $15 each: Low beam: Sylvania H4703 High beam: Sylvania H4701
  14. chengny

    Pedal to floor when engine running

    It's normal - and correct - for the pedal to fade slightly when the engine is started. Matter of fact, not doing that is the defining characteristic of a booster problem: Check for proper brake booster operation With the engine "OFF", depress and release the brake pedal 4-5 times (this bleeds...
  15. chengny

    Constant hot wire

  16. chengny

    Pedal to floor when engine running

    So the condition began only after doing the engine change - correct? Any other changes made during the engine swap? You mention this: I had some leaks at new fittings but no leaks now.......finally!! Does that refer to leaks at the brake fittings - ones that only developed after you changed...
  17. chengny

    Constant hot wire

    Those are most likely the wires to the factory radio (YEL is the power and the BLK is the ground). There should be a gray wire with them or somewhere nearby. That would have been for the radio's backlighting - from the instrument lighting circuit.
  18. chengny

    Constant hot wire

    Yeah, that's exactly what I thought he meant too. Otherwise he wouldn't even need a constant power supply.
  19. chengny

    Pedal to floor when engine running

    The big questions are; Did you do all that work to solve an existing low pedal condition? Or, was the pedal travel normal (and the work was just done as preventive maintenance) up till that point? But then, only after the renewals were completed, it became excessive? Reason I ask is, maybe...
  20. chengny

    Constant hot wire

    I could very well be wrong, but the way I read his original post was; That he was all set with the switched power (YEL from the truck's harness to the RED in the radio's harness). What he needed help with was, where to find a nearby uninterrupted 12 volt source. So he could splice it into the...
  21. chengny

    700r4 hose adapters

    Because the O.D. of the threads on an NPS fitting are cut straight (i.e. not tapered like NPT) it would be hard to crack the case when making the joints up. While an NPT joint is sealed by the reduction in clearance - between the male and female components that develops as they are threaded...
  22. chengny

    Door Latch Mechanism on 1976 Chevy K10

    I didn't have any inside handle for a few months a while ago. I couldn't easily reach out to press the outside handle button either. So, to get out of the truck I was reaching in/back to the lock mechanism and pulling up on the piece shown circled in red - I think. That seemed to override...
  23. chengny

    Constant hot wire

    There are three ORN (40, 140 & 240) circuits that are always hot and supply tons of stuff. You should be able to find a number of places to splice into one of them. For example: 1.The ORN 40 feed goes to the tail light terminal on the headlight switch and then to the courtesy lighting. 2...
  24. chengny

    Dash brake light keeps coming on

    If you can't convince anybody to help you, here are a couple of ideas; 1. Replace the factory bleed fittings with Speed Bleeders. They have a little ball check valve that prevents ingress of air when the brake pedal is released - but still allows flow out when it is applied. 2. Or try...
  25. chengny

    Need a new exhaust

    Good question. The diameter and thread pitch of the bosses in the manifold (and the tube fittings that go in them) is a closely guarded secret. I say that only partially in jest. I once read that the GM engineers purposely spec'd an extremely obscure thread style to discourage the end users from...

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