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  1. chengny

    Weird Starting Issue After Putting It Back Together

    Unless you know the engine's history, ignore the relationship between the timing tab and the mark on the balancer hub. The method you used to put the #1 piston at TDC is the best when working with an engine that may have been modified. If either the timing cover or balancer have been replaced...
  2. chengny

    Heater box bolts (the ones with clips instead of heads)

    OEM part no. 3024884 Maybe here: http://thepartguy.com/heaterboxchevelle_el-camino_monte-carlo_malibu.htm $25/15 - new/used
  3. chengny

    Electric choke simple wiring

    By the heat radiating off the engine. Hey Jim, I was thinking about how to make your wiring diagram - but also about how the leads would have to be physically run. I was wondering if you had considered mounting the sender down by the oil filter and the switch by the distributor. It would make...
  4. chengny

    Electric choke simple wiring

    I think that port was used up until the early-mid 80's in exactly the same way Jim intends to do. IOW, the sender for the gauge was mounted behind the distributor (using a simple street elbow) and the switch (used to supply voltage to the heater coil) was screwed directly into the port above...
  5. chengny

    Electric choke simple wiring

    1. I have oil pressure gauge sender which will be dedicated to electric oil pressure gauge. The sender will be installed under the dizzy. This is the 31 circuit. PROBLEM 1 SOLVED. Yep, sounds good. The sender alone can be easily mounted behind/under the distributor using an off the shelf 1/8"...
  6. chengny

    Strong gas odor

    You might want to check the fuel pump weep hole - if it has one. A mechanical fuel pump can have a ruptured diaphragm and yet most times will still deliver sufficient gas to run the engine.
  7. chengny

    Electric choke simple wiring

    If I am reading this right - before you even get into the wiring - you might need some more parts. First, operation of the choke heater and CHOKE warning lamp will require the installation of an oil pressure switch: The sender needs to be dedicated to the gauge. It is used to position the...
  8. chengny

    Strong gas odor

    I wouldn't waste too much time trying to completely understand the circuit. Maybe consider just checking the oil pressure switch first - the one that has the two pin connector. Since your oil pressure gauge is working fine, don't bother looking at the pressure sender - one pin connector: The...
  9. chengny

    Please help identify this cut hose

    Since you have no knowledge of the truck's history it might be best to work backwards on this one. First check whether there is any voltage to the blower motor from the blower speed control relay. Check for voltage with the control switch in every position. Next check would be for continuity...
  10. chengny

    Please help identify this cut hose

  11. chengny

    Strong gas odor

    Yes, a poor/non-existent ground at the choke heater coil will prevent the CHOKE warning lamp from being extinguished: On most vehicles, an electric assist choke is incorporated onto the carburetor to aid in reducing the emissions of hydrocarbons (HC) and carbon monoxide (CO) during starting...
  12. chengny

    Leaky small block

    There is one opening that connects the internal lube oil system to the exterior of the block - and the only thing that keeps the oil from leaking out is a 3/8" - 16 bolt (NC threads). There are no o-rings, gaskets or any other type of seal used on it. I don't know for sure that GM did this...
  13. chengny

    6 cyl backfire through exhaust and carb question

    It is difficult to say for sure, but from what I can make out of the images provided, it appears that your Decel valve has been effectively disabled. It doesn't have a high vacuum hose attached to the actuating chamber and the associated plumbing doesn't look to be completely intact. This is...
  14. chengny

    windshield wiper return issue

    Sounds like the NC switch in the parking circuit is not making contact (and thus failing to provide a path to ground) until the very end of the downward stroke. When in low speed, the LO speed brush is connected to ground through it's own dedicated lead and dash switch - the motor runs...
  15. chengny

    Lights and wires

    I'm fairly certain that (without some modifications) the H/L design of the wiring used in your 88 isn't compatible with the V22 RPO option (quad headlights) installed in the 89 grille/HL setup. Prior to 1989 the V22 option had one dual filament sealed beam and one single filament sealed beam...
  16. chengny

    braking system split

    Probably not your problem, but just something to look at. On the hot RR drum, what kind of condition are the contact pads in - and are they lubricated? Look closely at the condition of the contact pads on the backing plate. Although there is not any relative rotary motion between the brake...
  17. chengny

    Dust Shield

    You are probably not going to have much luck finding these. The OEM part numbers are 15649243/4 (L/R) - and they seem to be NLA everywhere. https://www.gmpartsdepot.ca/a/GMC_1990_C1500/59808543__6380839/BRAKE-COMPONENTS-FRONT-SUSPENSION/GH88080.html With every link, you'll get something like this:
  18. chengny

    1987 3+3 lighting issue

    Need some details. Sorry, don't mean to get get preachy, but without punctuation it is difficult to understand your question. It's all one run-on sentence. Anyway: 1. Quad or dual headlamp style? 2. What lamps work/don't work if the H/L switch is in the parking light position? 3. "...
  19. chengny

    a/c in a non a/c truck

  20. chengny

    a/c in a non a/c truck

    Parts lists:
  21. chengny

    a/c in a non a/c truck

    If the system is still complete the vacuum hose harness should have everything you need. Only one hose goes through the firewall and into the engine compartment. These dwgs might be of some help:
  22. chengny

    Alternator

    You're correct. The term "serpentine" refers to the way the belt is routed. ser·pen·tine: a thing in the shape of a winding curve or line, in particular. Because multi-ribbed belts are almost universally used with serpentine drive setups, they have become commonly known as serpentine belts.
  23. chengny

    np 241 tranfercase

    I'm no expert on T/C design/repair - by any means. But just from what can be seen in the parts dwgs, it doesn't look like the front casing of a 208 would work with a 241. 208: 241C:
  24. chengny

    Backfire through carburetor

    In light of the fact that the engine wasn't operated for a few years, it might be worth your while to pull the valve covers and check for a sticking intake valve. You seem to have eliminated the other two most common causes for a backfire condition (an extremely lean A/F ratio and highly...
  25. chengny

    Steering column plastic cover

    A decent exploded dwg and parts list (tilt with automatic transmission). Be aware, what the dwg shows isn't really what things look like:

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