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  1. chengny

    Slow hot crank

    This condition is often the result of overly advanced timing. It can get so bad that you get kickback while cranking and run-on after shut down. Try retarding the timing a bit. Rotate the distributor CW in tiny increments and see if it alleviates the issue.
  2. chengny

    Non-Tilt Gear Shift Lever

    That was OEM P/N 3990498 - for your specific truck. However, GMPartsWiki shows the P/N indicated above as having replaced P/N 6272365. That lever with the later P/N is available here for $149...
  3. chengny

    Heater refurb question

    Maybe I'm reading this wrong, but I don't think he needs - or wants - the tube. Since his system is heat only, there is no place to connect the supply end of the tube - like there is on an AC equipped system:
  4. chengny

    Help what bolts do I need to assembly ac unit?

    Maybe this will help you:
  5. chengny

    Heater refurb question

    1. On a non-AC system the heater core is retained by two "clamps". They are different - the P/N's are 3024673 & 3025501. The heater core in an A/C system is retained by one "clamp" and one "strap". Those P/N's are 3024912 & 3028863. So the answer is no - you can't use the brackets from an AC...
  6. chengny

    TH400 acting oddly

    I think what happens is that - while the linkage length/alignment stays as original - over the years, slop develops in the nylon bushing (that the outboard end of the shaft assembly rides in). When that happens, the detent points begin to drift out of adjustment. BTW, that bushing is available...
  7. chengny

    Brake Lines Copper or Steel

    X2. It's no big deal, but just be aware that when they ship your order, the "preformed" lines get packed into a cardboard box. The box is approximately 36" X 14" X 6" for a 9 piece set. To get the lines into a box that size, it is necessary that the long ones be gently bent. When unpacking...
  8. chengny

    Heater refurb question

    What's wrong with your current cables? Since they are not exposed to the elements, it's rare to see either a temperature or mode control cable that is rusty. If they are hard to move, I would be looking for kinks/improper routing in the cables themselves. That, or maybe a problem within the...
  9. chengny

    Preferred location for battery ground

  10. chengny

    TH400 acting oddly

    Improper adjustment of the shifter linkage is first on the list of probable causes - for forward creep in neutral: Moves Forward In Neutral Manual control linkage improperly adjusted. Forward clutch does not release. Oil pump. Internal linkage. Adjustment procedure: Position...
  11. chengny

    Wiring Harness

    Check your conversations. I might have half of what you need. There are really two engine harnesses used with an ECM controlled engine. There is the one that plugs into the main bulkhead connector and another that plugs into the ECM and transits the firewall over by the transmission dipstick. I...
  12. chengny

    Damn mice.

    An old post: I had the same problem - the truck was a lumber yard truck that never left the lot. For 21 years the mice made it their home. I bought it (thought it was stale cigarette smoke), and by the time I figured out what the smell was - it was too late. The interior smelled so fr**kin...
  13. chengny

    Damn mice.

    Represent! I hate f-in' mice, they give me the creeps. The following isn't specifically about mice in trucks, just about mice in general: Never even saw a mouse till we moved up to the Wht Mts. Like K, I tried everything to keep them away but they just didn't care. So I figured I would just...
  14. chengny

    Heater core to firewall seal

    That's GM part 6273325 - SEAL, HTR CORE PIPE. A quick search suggests that it is NLA everywhere. Same part number all the way up to 1991. Yours doesn't look too bad anyway. But, if it really bothers you, maybe run a little bead of silicone around the pipes. Or fabricate an extra layer from...
  15. chengny

    wire routing and questions!

    Are talking about how they are physically run or what they are connected to? If it is the layout you mean, it is like this: The engine component harness is essentially layed out in a T shape. All engine associated wiring transits the firewall bulkhead connector through the large inboard...
  16. chengny

    Heater refurb question

    Try releasing that lower RH screw from inside the plenum. Rather than fighting to get a socket on the hex head, it's way easier to access the threaded portion. There are two ways to reach it. Whichever way you decide to use, just grab it with a small pair of Vise-grips, Channelocks or even just...
  17. chengny

    Oil pressure gauge wires

    There is only one lead that runs from the gauge, transits the FW and connects to the oil pressure sender. It's TAN. The sender body is grounded through the engine block and (depending on oil pressure) it creates a variable resistance that is used to control the gauge's needle position. The...
  18. chengny

    Seals, felts, scrapers, etc

    X2 - I have always received good stuff from those guys. Occasionally they even supply NOS parts when they are not listed as such.
  19. chengny

    Shifter on steering column lose

    If you mean that the shift lever is loose and kind of flops back & forth, it is most likely a broken shift lever return spring. The spring is easy to find - and not very expensive (maybe $10). Search for GM part 7812853. Below is how to replace the spring. If you do this repair, don't skip the...
  20. chengny

    Loosing 12v when key turns to crank

    It is rare, but the starter or solenoid can develop an internal short to their casings (which are grounded). When the ignition switch is moved to START, the voltage across the whole system is pulled down. If you have a spare starter, you might try changing it out and see what happens. Another...
  21. chengny

    Electric Power Issues

    You're welcome. Good luck.
  22. chengny

    Fuel tank selectrical issue

    The issues are: truck starts rough, sometimes it quits, but once warmed up it’s ok. If I use right tank the truck is running fine, however if I select left tank, engine will quit and service engine soon will come on (code is 43). So, if you start up on the LH tank, it never runs well - even...
  23. chengny

    Unused ground buss and...

    Yeah, I know it was lame. Sorry.
  24. chengny

    Unused ground buss and...

    Yes, I believe that's correct.
  25. chengny

    '88 350 TBI Firewall 12v Junction to Bulkhead connection wires?

    Oh boy - I guess I assumed too much. On these dwgs you'll notice a line labeled "cowl". That is how they refer to the firewall. Notice that it runs between the two halves of the main bulkhead connector. The MBHC is essentially just a big, multi-pin socket/plug assembly, the two halves of...

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