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  1. chengny

    Why do I have a transmission kickdown relay?

    I think that in later years - when certain transmissions were being phased in and out - the MX0/1 RPO's became a catchall code for any automatic transmission. MX0 MERCHANDISING OPTION ONLY-DO NOT CATALOG MX1 MERCHANDISING OPTION ONLY-DO NOT CATALOG Even the description for the M40 code...
  2. chengny

    I need help with fuel tanks on my 87 dual tank

    So you're saying the pump might come on but it's not shuttling the fuel to the dead tank. Kind of like that. When you toggle the switch on the dash to the LH tank, power is applied to the tan lead. That is supposed to do three things: 1. Start the production (LH) tank pump 2. Shift the...
  3. chengny

    I need help with fuel tanks on my 87 dual tank

    Does the gas gauge seem to indicate the level of the selected tank? If switching tanks (and the tanks have significantly different levels) does not cause a noticeable change in the gauge reading, it may indicate that only the pumps are being switched. There are only two leads coming out of the...
  4. chengny

    Instrument cluster problem

    Do you mean the actual gauges (the needles on the dials) all dropped to zero - or do you mean the backlighting for the gauges went out? It sounds like the first one. Just as a test, turn your headlights on and if the gauges tank, try turning the dimmer rheostat all the way down. See if they...
  5. chengny

    No power to dash!! hELP

    1. Radio - most modern head units use 2 power supplies. One is for memory (yellow) and is always hot from the battery. The other is the switched power supply (red) and is only hot when the ignition switch is in RUN/ACC. 2. HVAC blower - there is no operation at all? None of the speeds work...
  6. chengny

    No power to dash!! hELP

    Couple of questions: 1. Is the radio original or an aftermarket replacement - and is the associated wiring still as factory? 2. Straight heat or AC system - and by "no heat", do you mean that the blower motor is inop? 3. Are the turn signals still NFG? 4. Important - Can you provide clear...
  7. chengny

    No power to dash!! hELP

    Some additional information (both the switch and lock cylinder should have been in the "lock" position when the switch was installed):
  8. chengny

    No power to dash!! hELP

    Not sure if I left something loose when changing ignition switch? Maybe not loose; but rather, not properly adjusted. Just by looking quickly at the wiring diagrams for your Jimmy, it appears that the ignition switch contacts that feed both IGN circuits and the ACC circuit are not making (i.e...
  9. chengny

    Front door hinge spring replacement

    1. This may be the most critical step - get a plan in place to support the door while the upper hinge is off and the spring is being replaced. Those MF'in doors are GD heavy. 2. Locate the "hidden" bolt. It is accessed from inside the cab - through the A pillar. There is an opening way up on...
  10. chengny

    Weak Wiper Arm Springs

    Jess, those arms have likely seen some serious abuse over their 21 year lifespan (read: some idiot weekend warrior yanking back on them - you know - to get them off the glass while doing a blade change). First, make sure your glass is really clean - that is important. If that doesn't stop the...
  11. chengny

    Dead short with IGN off.

    Sounds like you have cut power to everything - by pulling all the fuses and having the ignition switch in the OFF position (provided the ignition switch is good) - except the headlight switch. The power supply to the contacts used to switch the headlights on/off is fed directly from the battery...
  12. chengny

    Factory cruise control wiring diagram?

    Just some more detail:
  13. chengny

    Blend Door for dummies?

    Make sure the diverter door connecting link is intact and secured to the door (and actuating arm):
  14. chengny

    Frame doesn’t look quite right

    I don't see a bulge - but I think the width of the rail's top flange does taper down a bit in that area. Maybe that's what I'm seeing. A better view:
  15. chengny

    Frame doesn’t look quite right

    Yeah, but check this out: It might be just the camera angle, but that section does not look right. I'd be concerned about it. Here is the same section on one of my trucks:
  16. chengny

    Frame doesn’t look quite right

    The way that the engine crossmember is shaped and mounted can sometimes give the illusion that the frame is twisted/bent: But that is the way it is supposed to be: h
  17. chengny

    Help!! I need a trick to free up a motor.

    Just shooting from the hip here: That gas in the crankcase - whatever the source (presumably leaked from the bottom of the carburetor) - ultimately got there by seeping through the gaps between the piston rings/cylinder walls. But it didn't immediately flow right past the rings. For some period...
  18. chengny

    87 305 tbi crank/ no start issue

    Yeah, no SES light - with the ignition switch in RUN - is bad medicine. But before you condemn the ECM (and buy a new one), do a couple of checks. Be sure there is power available to the ECM on circuit 440 (pins C16/B1 - these are common) and circuit 439 (A6 - key in RUN). See the wiring diagram...
  19. chengny

    That curved tube that protects battery cable by the starter

    I was thinking that as well but the spacing didn't look right. From the image provided, the tabs looked to be much closer than the distance between the bolts. IDK
  20. chengny

    Front axle tube slipping out?

    Some more evidence that the relief cut is by design. These show my old truck (86 K20) and - although it is covered in POR-15 - the cut in the axle is fairly obvious. And it never had any problems:
  21. chengny

    That curved tube that protects battery cable by the starter

    The tab with the 90° bend is secured by the top right transmission-to-block bolt and the other one is secured by the inboard solenoid mounting bolt: It looks like the earlier style was bit longer in the front - but the tab spacing/location appears to be the same.
  22. chengny

    What is this other relay plug for?

    I could only find 3 relays that were mounted on those clips - if the the truck came equipped with the associated option: 1. Auxiliary cooling fan relay 2. Daytime running lamp relay 3. Cold advance glow plug inhibit relay Since none of you guys are from Canada or are diesel powered, I...
  23. chengny

    Anybody else have my luck buying a headlight switch ??

    I think the connector will go on. Never mind, I see you got it on.
  24. chengny

    Reverse Light Switch wont engage

    Is the reason that the tab (on the switch set) can't reach and engage the slot in the column jacket, due to the ID of the switch housing being smaller than the OD of the jacket? If that is the case, I think that you might have the wrong switch. If you still have the old switch maybe you could...
  25. chengny

    Need help locating wire harness

    Maybe start at the select switch on the dash and trace the harness back towards the firewall. That should give you a good idea where they transit the FW. They have their own 4 pin bulkhead connection block similar to the main bulkhead connector - just much smaller. A round connector plugs into...

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