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  1. chengny

    Rubber Flooring Question

    Try these guys: https://www.stockinteriors.com/moldedvinyl.asp?Itemid=13135&ModelId=479 I bought a vinyl floor mat from them and was impressed by how well it was molded - fit pretty much perfectly. This isn't it, but the image gives you an idea of the detail they put into matching the mat to...
  2. chengny

    How to clean gas tanks

    In case anyone is still interested, here is the factory procedure (for gasoline tanks - diesels tanks are way more involved):
  3. chengny

    No ignition power

    How about these:
  4. chengny

    No ignition power

    X2 Your connector won't look exactly like this (87), but the stab connections for the power feeds will be in the same bays as shown. Top row - most inboard bay and 4th row down - middle bay: Another member recently found this situation: h
  5. chengny

    No ignition power

    Have you checked the fusible link up near the junction block mounted to the FW. I would do that next. In addition to those components you mention that link also feeds a lot of other things via the ignition switch.
  6. chengny

    84 electrical issue.

    Sounds like the horn is an entirely separate issue. Maybe concentrate on the lighting problem first. Since the front and rear directionals share a common terminal within the directional switch assembly, it would appear that there is a loss of continuity somewhere in the rear lighting circuit...
  7. chengny

    Truck just quit on me

    http://www.mediafire.com/file/i59ns2td5zz6zzg/X8736_1987_GMC_Light_Duty_Truck_Fuel_and_Emissions_Including_Driveability.pdf And a lot more: http://67-72chevytrucks.com/vboard/showthread.php?t=545416 Compliments of hatzie.
  8. chengny

    AC help

    To take that idea a step further, just from looking at the 454 hose set vs. a 350 set...I can't see any reason you couldn't use a 350 set. The only difference I can see is the routing, but they both end up in the same places. On a 350 set, the compressor discharge hose to the condenser runs...
  9. chengny

    Running rich after pump change

    Check for leakage through the injectors when off stroke. Simple test, just unplug the injector connectors and crank the motor. Obviously, there should be no fuel spraying/dripping from the injectors. Another sensor that the ECM relies upon to calculate required injection duration is the TPS. If...
  10. chengny

    Truck just quit on me

    Stupid questions? Sheeiit, you should see some of the questions that come in. At least you're actively trying to figure this out and have done your homework. It's not unusual to get requests for help that include a description of the problem that goes something like this - "My engine doesn't...
  11. chengny

    AC help

    Yeah, bad news Jason. It seems that the hose set you need - GM part 15591124 - isn't available anywhere...at any price. No supercessions, no alternate P/N's. There's just nothin' out there. And really, I looked around for quite a while. I'd heed the advice offered by Roger & Viktor and just...
  12. chengny

    Truck just quit on me

    What kind of got skimmed over (and remains unanswered) was Jesse's question regarding the color of the spark across the electrodes. It was buried within the text of post 16: Is the spark white and not yellow? A healthy spark manifests itself as a bright blue/white arc that jumps across the...
  13. chengny

    Bed hardware

    You will probably be better off just using "off the shelf" fasteners. They will be cheaper and way easier to source. If you have trouble finding a particular piece, check with Fastenal - they have plenty of retail locations in PA. See the dwg/parts list below for the diameter, thread pitch and...
  14. chengny

    87 ls swap a/c system wiring

    1. They are connected together at the firewall - near the junction block. The connector style makes them unmistakable (see below) 2. There is no relay involved in the compressor control circuit 3. No 4. The ECM will receive an input signal that the compressor is engaged using just the factory...
  15. chengny

    1985 Silverado K30 R-12 Air Conditioning issue

    If you didn't notice any oil on the floor (from handle vent or shaft seal), it would be pretty safe to assume that; unfortunately, yes. The volume of oil you lost from the pump is now in the system. But I wouldn't stress about it. That Mastercool pump only takes 8.5 ounces of oil. The 3 CFM JB...
  16. chengny

    Headgasket replacement cost

    From the GM shop manual: Those are the estimated labor hours for a 350 (or any other SB) - but I imagine that a BB would have similar numbers for labor hours.
  17. chengny

    RPO J55

    RPO J50 is a non-specific code for power assisted brake systems - it only differentiates power brakes from manual brakes. The 11" X 2" rear drum dimension was only used with the JB1 & JB3 systems. So, when taken together with the power assist feature, it would indicate that you have JB3 brakes:
  18. chengny

    Battery to Starter Cable routing

    Ah yeah Jeez, I'm sorry Daveo. I wasn't very clear about how the cable is routed past the mount. I described it as below: After that, lead it down under the mount and into the frame rail - up against the web (vertical component) That's pretty much correct, but I left out one key word that...
  19. chengny

    Battery to Starter Cable routing

    The battery positive cable to the solenoid actually uses two of those rubber coated supports. The first one - after leaving the battery - is the twisted one that you are holding in the image above. It bolts to the upper flange of the frame rail as shown here: After passing through that first...
  20. chengny

    Convert cargo light to third brake light

    There is a circuit (WHT 17) that can be tapped into for a dedicated brake light signal (i.e. one that is unaffected by turn signal operation). It is short - the only accessible part is from the load side of the brake switch and where it enters the steering column - but it is common practice to...
  21. chengny

    Bulkhead connection check

    2J - connected to starter battery terminal I believe this is the main power source that leads in to the cab? Yep, it feeds the headlight switch (but only for the H/L's - the other exterior lighting is supplied separately). Also supplies the BATT section of the fuse block (fuses TL/CTSY...
  22. chengny

    Front Grill Options and fitment.

    Part number is 15554913 https://www.gmpartsgiant.com/parts/gm-grille-15554913.html
  23. chengny

    '87 R20 AC Recharge

    You're probably correct on this - now. But, when I got my Section 608 Universal certification (like maybe 20 years ago) the rules were different.
  24. chengny

    '87 R20 AC Recharge

    No problem, but I had to go to the store - so a lot of info was left unsaid. 1. If the system has been allowed to drop to atmospheric pressure, it will be contaminated by moisture and non-condensable gasses (i.e. air). It will be necessary to evacuate the system before even attempting to...
  25. chengny

    '87 R20 AC Recharge

    The low side port is circled in yellow: Add gas in small quantities. Keep checking for sufficient charge. Don't overcharge - that can be worse than under charging. A quick check can be done by feeling the liquid line (after the orifice) and the evaporator outlet. They should both be cool and...

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