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  1. chengny

    Electric choke

    Yeah - that design was just to placate the EPA. The choke plates will eventually open without any help from the electric assist. All of the following will not apply to your EB 1406 carb, but it is a good overview - and it might be useful to someone else later on: On most vehicles, an electric...
  2. chengny

    Occasional fuel loss?

  3. chengny

    6.2 diesel exhaust system

    Try these guys - AP Exhaust: https://www.gmsquarebody.com/threads/where-to-buy-exhaust-pipe.21167/page-3#post-405087
  4. chengny

    Electric choke

    Not that you even asked, but here is how the choke heater/warning light circuits work as from the factory:
  5. chengny

    Electric choke

    Provided the choke heater wiring is in good condition, and the CHOKE warning light illuminates...it could possibly be telling you that your oil pressure is low (like under 10 psi). I would investigate it - if you don't have a gauge package.
  6. chengny

    HVAC Vacuum setup

    Other than sharing a common source of vacuum to operate their respective controls, the HVAC and CC systems are entirely independent of each other. You might want to consider tackling the re-activation process one system at a time. Say you just want to re-establish the vacuum supply to the HVAC...
  7. chengny

    No Fuel

    2X Jesse's suggestion as above. But since you are unable to pull from either tank, take a good look at the short section of rubber hose that connects the transfer valve outlet port to the steel tubing (that leads forward to the fuel pump inlet). Since that piece of hose is common to both tanks...
  8. chengny

    Pedal Return Spring

    I didn't think a "return spring" was even used with the hydro-boost brake system. Where would it be located? Here is the applicable dwg/parts list:
  9. chengny

    Truck won't start after sitting for years

    Ignition system diagnostic procedure (with remote coil):
  10. chengny

    1985 Silverado K30 w/454 correct a/c compressor??

    Two variants of hose sets were used on the 1985 K30 with a 454. Which one was installed depended on the emissions package - because of the difference in exhaust manifolds used. A 454 K30 with H4D emissions had cast iron exhaust manifolds (as shown above). The part number for that hose set is...
  11. chengny

    Hi-altitude Carb tuning....help please....

    Modifying the carburetor and timing settings - for high altitude applications - has more to do with performance than fuel economy. It is not an exact science, but the general guidelines are to lean out the carburetor and advance the ignition timing. I couldn't find a number for the elevation...
  12. chengny

    Parts Indentification

    It would appear that the truck originally came with 305 (LE9) engine - which in 1985 utilized an ESC (electronic spark control) system. It also appears that the ESC system was "decommissioned" when the original engine was replaced by the 350 ( a 355 is just a 350 that has been bored .0030"...
  13. chengny

    Dome and Courtesy light issue

    Those images were from the 1990 GM RV & P Light Truck Wiring Manual. While 1987 was the last year of production for the C/K 10/20 line of trucks, GM continued using the pre-88 design features - including the electrical systems - for selected models (C/K 30, Suburban/Blazer and maybe 30 series...
  14. chengny

    Baking or buying wheels?

    Mine are stock rims - the original ones that came with the truck. They were in poor condition when I bought it. Pulled the tires and took them to the local gravestone dealer for blasting (apparently they cut the letters into the headstones with some kind of special grit). On days when business...
  15. chengny

    Dome and Courtesy light issue

    Is this correct: 1. Both dome lights illuminate when rear doors or tailgate are opened - but no courtesy lighting 2. No dome lights (front or rear) when front doors are opened - or when the rheostat is fully rotated CCW. 3. Courtesy lighting will work when front doors are opened and by the...
  16. chengny

    License plate lights don’t work

    The plate lights have just a single hot wire and are grounded through the body of the socket, then to the bumper. This is as opposed to the rest of the lamps in the rear lighting group, all of which have a ground wire in addition to their associated hot wires. Before tearing into the...
  17. chengny

    Extra wire in starter loom

    You noticed this wire in both the donor (76) and the recipient trucks? And in both cases it was run down to the area of the starter - but after it exited the loom, it headed back towards the rear of the truck? On the 76, could the lead - that appears to go to the gas tank - possibly be tan...
  18. chengny

    Elec. window/ lock harness question

    The devil is in the details on this one. When I did this modification for the first time - like Travis says - it was an absolute pain in the ass. And that was only because; I wanted to maintain the integrity of the OEM wiring (i.e. did not want to cut and splice the original...
  19. chengny

    Mixing JB3 and JB5 brakes

    It sounds as if you are all over this, but just in case: Probably the most common cause of rear drum brake grab is that the shoes are reversed. IOW, the smaller leading shoe is in the back and the bigger lagging shoe is towards the front. Shoes/Linings incorrectly installed. Each side should...
  20. chengny

    Brake booster short circuit

    Something is shorting to ground through the booster. Post an image of where the hotspot occurs. Also, try turning the ignition switch just to RUN (don't go to START). Wait a while and see if the same thing happens. The only additional circuit that becomes hot when cranking the engine is the...
  21. chengny

    Electric Locks Completely Dead

    First checks: That the circuit breaker under the E socket column (far right) is good. That breaker protects all the circuits that are plugged into the E bank sockets. Also make sure that the connector for the 60 ORN/BLK circuit is properly plugged in to one of the 3 sockets in the E column...
  22. chengny

    How I hate electrical issues...

    That's where I was headed.
  23. chengny

    Windshield squirter wiring

    Because you don't provide a model year, it is a time consuming - and speculative - process to locate the appropriate wiring dwg. I am going to make my best guess based on the following: First thing is: the leads - and that connector - probably don't even go to the washer pump. Wiring to the...
  24. chengny

    How I hate electrical issues...

    If you don't mind; I was wondering which fuse was it that you found to be blown? Reason I ask is because power to the headlights is unfused and independent of all other lighting feeds. The headlight circuit is protected only by a pair of fusible links - located in the engine compartment. The...
  25. chengny

    Picked up this tach cluster.. how difficult is install?

    I am reading this as saying: You are happy with losing the ammeter as long as you get the tach feature. So, you intend to discard the printed circuit that came with the cluster pictured above, buy a new one applicable to your 76 (with tach option) and install it in the early model cluster. When...

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