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  1. chengny

    305 Slow Uphill, Dizzy Weights?

    If I am diagnosing a SBC - one that idles smoothly and runs great under minimal loads - but will not pick up any appreciable loads (like going up an incline) and yet continues to run smoothly, as opposed to backfiring, bucking etc. The first thing I would do is the 3 basic checks of the fuel...
  2. chengny

    Power to the fuse block?

    There are two branch circuits - that originate at the starter solenoid. One supplies the ignition switched components (which you don't seem to have a problem with). Only the ignition switched branch passes through the firewall junction block. The lead that feeds the affected circuits - the ones...
  3. chengny

    Truck won't start after sitting for years

    A good initial diagnostic is to get a can of ether (starting fluid). Shoot a good blast directly into the throttle body. Then - quickly before it has time to evaporate - crank the engine over. If the engine fires up (it will probably only run for a few seconds), that would seem to indicate a...
  4. chengny

    Anyone know what this in dash harness and bulb is ?

    Are you kidding? That was over 5 years ago - most days I'm lucky if I can even remember what I had for lunch! Here read this: http://www.1stgen.org/viewtopic.php?f=3&t=16173
  5. chengny

    Clock fix?

    GM specific procedure: Testing and Inspection Regulation of electric clocks is accomplished automatically by resetting the time. If the clock is running fast, the action of turning the hands back to correct the time will automatically cause the clock to run slightly slower. If the clock is...
  6. chengny

    Help jumping electric windows?

    http://www.gmsquarebody.com/threads/power-window-problem.21011/#post-398078
  7. chengny

    Anyone know what this in dash harness and bulb is ?

    Actually, it kind of looks like the leads are a WHT & PNK/BLK tracer. If so, then I agree - it's a pretty safe bet that the lamp would be for 4WD indication.
  8. chengny

    cut to the chase

    Just reading between the lines: It would appear that you have a working spare starter - one that is essentially free - but it came from a later model truck than the one you want to install it into. Correct? So, would it be safe to say, that this is more of a fitment issue - rather whether to...
  9. chengny

    Wiper delay module 1984 vs 1989

    Nope, sorry Lar you missed it by one year. 85 -91 all use the same module (15594386). But the module used in the pulse systems for - 84 and down MY's - are different (14074359). I didn't check for superseded P/N's - so you might want to do that. But I agree with Jesse, that they are totally...
  10. chengny

    NP205 4wd Indicator Switch Question

    That switch is NO (i.e when the TC is in either N or 2WD) if 4WD is seleted, the switch closes and completes a path to ground. The other leg of the lamp is always hot:
  11. chengny

    Temperature sending unit help!

    Yes, and that's all good - if the part that the customer actually receives is what is pictured in the listing. But anecdotal evidence suggests that - when it comes to this particular part - what the vendor ships is rarely what is shown in the picture. If you order on line, you'll either get a...
  12. chengny

    Temperature sending unit help!

    It looks like the P/N for the sender you need (with 3/8 -18 NPT threads and the "nail head" style terminal) is 25037346. I looked around for a few minutes and it quickly became apparent that these are getting real hard to find. It may be case that the best place to find this part is at the...
  13. chengny

    Help Needed on Wiper/Washer Wiring-Introduction

    Some washer diagnostic info:
  14. chengny

    Please help identify this connector...

    Any chance the grey wire might actually be brown that has faded? Do you or did you have an ESC system installed? If so, is there a tip-in vacuum switch mounted on the firewall? It could be on the RH side - by the transmission dipstick: Or on the LH side behind the master cylinder vacuum...
  15. chengny

    Another annoying AC Question

    The situation you're describing is a classic chicken/egg dilemma. For whatever reason, you don't know what type of compressor was installed (odds are it was an A6). To make matters more complicated, the shop lost the compressor bracketing. If you knew which version of compressor was installed...
  16. chengny

    Please help identify this connector...

    Truck series and transmission type? Best guess at wire colors.
  17. chengny

    Temperature sending unit help!

    Can you post an image of the terminal connector (on the end of the lead that goes to the sender). Actually, it would be even more helpful if you provided a photo of the original sender. There must be something screwed into the threaded hole now - or coolant would be flowing out. Also, as far...
  18. chengny

    Temperature sending unit help!

  19. chengny

    Wipers turn on after random components are shut off.

    Yes, that is the switch used with intermittent wipers. Plugged into the back of the switch (with two connectors) is the pulse module: Switch operation: Switch diagnostic: To confirm/eliminate the module as the cause of the phantom sweeps, temporarily remove it from the circuit -...
  20. chengny

    Temperature sending unit help!

    There are several different design variants (thread size, terminal configuration, number of terminals, etc) and a couple of different applications (ECM, gauge, warning light) for the coolant sensor. I don't know your exact situation, so - to avoid confusion - here is the relevant section of the...
  21. chengny

    Wipers turn on after random components are shut off.

    That (improper grounding) is generally the first thing that I think of. But actually the converse would be true in this case. The common brush is always hot and the motor winding circuit is completed only when a ground connection is established through one of the two (Hi or Lo) speed brushes. So...
  22. chengny

    Wipers turn on after random components are shut off.

    Intermittent wipers? Also - and I know it's hard to tell by observing just one sweep - does it appear that the wipers make that single sweep in HI or LO speed?
  23. chengny

    Swapping over to a tilt column, different connectors on the unit to swap.

    If I'm reading this correctly, the only problem is that you can't connect your harness to the component shown in one of the lower two images (neither one is square, but I am assuming that the top one is the one you want to use) - that shouldn't be an issue. That is the ignition switch BTW. I...
  24. chengny

    AC Help!

    Not sure how frequently you mean when you say: but the compressor cycles off and on pretty regularly It would not be considered abnormal if (with the cab cooled down) the compressor kicked in for say 10-15 seconds and then kicked out for a similar length of time. If you want to try, the...
  25. chengny

    Unable to bleed rear brakes

    It would barely squirt out both sides, is this normal? Something wrong with the proportioning valve? Short answers: No and possibly yes. Each time the brake pedal is depressed - with the brake lines disconnected - a large volume of brake fluid should be discharged from the open lines. As to...

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