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  1. 1987 GMC Jimmy

    Vapor lock with deadhead regulator on heat soaked motor

    I’ve been having some vapor lock issues on anything resembling a warm day. I get a little bit of stumble in motion, but it’s mostly heat soak related fuel boil/vaporization. The phenolic spacer seems like a good idea to prevent heat conduction, but the Q-Jet carb gasket is pretty thick, and I...
  2. 1987 GMC Jimmy

    Any value in these carburetors?

    I would say yes for the right buyer. They’re plenty that wouldn’t give two glances to any of that, but to someone restoring a Buick/Olds/Pontiac, which is what most if not all of this came from, or even an early smogger era Chevy, they’d buy the unrebuilt core for sure. A narrower market would...
  3. 1987 GMC Jimmy

    Ford guy here lol

    Welcome! That’s a nice truck, I like the premise of that setup. A hot 292 would be cool and maybe see what your gearing combo is and adjust to have better highway manners. My apologies that you like Ford, but they did make some good cars and trucks and tractors. Even though they didn’t build it...
  4. 1987 GMC Jimmy

    the viper mistake

    Why don’t you like the later C3s?
  5. 1987 GMC Jimmy

    Air filter test.

    Oil bath filters FTW! :headbang:
  6. 1987 GMC Jimmy

    86 Suburban From The Red Part of California

    Welcome! I think it’s funny that you specified the red part. There are still a lot of good people in California, especially in the rural parts and more heavily concentrated in your area. It’s just the cities, the state bureaucracy/“leaders”/legal doctrine, and around half or so of the total...
  7. 1987 GMC Jimmy

    Sbc 350

    What’s the history of the problem? Just pop up overnight, doing it a long time, gradually got worse, etc.? A visual vacuum inspection would be my first task, then taking a reading as mentioned, then checking my base timing, then making sure my curb idle speed/mixture were set correctly.
  8. 1987 GMC Jimmy

    newby here.

    Welcome! Mechanical and cosmetic things are more forgiving to redneck solutions, I’ve been known to sniff out a deal or even fix something that could have been replaced easily, but being a redneck electrician with it is a sure fire way to awaken the hell hounds, myself included. I only say that...
  9. 1987 GMC Jimmy

    79 Chevy k20 won’t run. Help!

    Farmall, Allis Chalmers, F*rd, John Deere, or other? I recently got me a ‘49 Cubbie and went through that whole thing. They came with magneto ignition but someone converted this one to points. First, no spark because the condenser was grounded to the distributor housing. Second, no start because...
  10. 1987 GMC Jimmy

    Quadrajet problem

    So nothing from tapping on it? You could also try a “poor man’s rebuild” before you pull it apart where you put your hand over it to choke it out and see if any obstructions will clear. I’m getting more confident with carbs myself, but I haven’t graduated to Quadrajet level proficiency. The only...
  11. 1987 GMC Jimmy

    V belts - good brand?

    Good results with Goodyear/Continental, Gates, and Dayco. Also check feeBay. I’ve gotten really good deals for belts there in the past.
  12. 1987 GMC Jimmy

    R-12 refridgerant to 134

    Ha, I laughed at that Agreed. I did also step up to the white o-tube after my second or third time. I think it’s slightly better all around. I’ve thought about stepping up another level to orange or red, can’t remember which one, but I didn’t want to risk highway performance, and I’d rather...
  13. 1987 GMC Jimmy

    Help! Not starting...

    How do the rubber lines look like at the tank right off the sender? If all those’re cracked, that’s sucking air into the lines and hampering the fuel you’re getting if there’s any at all. You can always test this by running a hose between a can full of clean diesel and the lift pump suction...
  14. 1987 GMC Jimmy

    Rebuild and sell or part out?

    That’s a tough one. I really feel sorry for 305s so I might rebuild it and not try to part out because the shortblock is still a 305 no matter what. The 305 can’t help it was born that way. I’m not gonna shower it with accolades, but I’m not in the camp that says let them die. If you have that...
  15. 1987 GMC Jimmy

    R-12 refridgerant to 134

    3.25 is original charge. You definitely addressed the main issue of the R4. Hopefully it’s not anymore noisy than normal and you get good use out of it.
  16. 1987 GMC Jimmy

    R-12 refridgerant to 134

    The condensers of today are made to accommodate R134a better, but changing them is optional. Flushing is not. I run the OEM condensers in all my factory R12 vehicles, and they get pretty darn cold in the summer. They’d do a little better with a new condenser, but I still prefer the...
  17. 1987 GMC Jimmy

    Which PAG Oil to Use

    The new R4s do call for 150, but I thought V5s and A6s did also in their R134a configurations. I’d call them and ask.
  18. 1987 GMC Jimmy

    speedo revolutions per mile

    A bad or even a dry cable can do that. Any length of good cable and a drill will tell you if your speedo head has a problem or if it’s the cable. If you wanna try to work with the cable you have, I believe it’s best to pull the cable out of the sheath if you can, clean both parts up with mineral...
  19. 1987 GMC Jimmy

    speedo revolutions per mile

    Not to deter from your question but whatever the issue is on your 100 mph unit, I’d send it off to be fixed. I hate the 85 mph units, they are totally ubiquitous where the 100 mphs aren’t, and there are mail order places all over the continent that’d do a good job for you. That is if your speedo...
  20. 1987 GMC Jimmy

    Th350 MPG question

    I wonder how much longevity you’d net out of a non-C versus a C TH350 with the same gearing, engine, tires, topography, and city vs. highway being driven in similar amounts. I’ll tell you what, the locked up 700 in OD with 2.56 gears is a real beauty when the converter is acting up. When it’s...
  21. 1987 GMC Jimmy

    Harmonic Balancer ?

    Does it spin true? I’ve seen some with dry rotted rubber that I would never run, and in my experience, the rubber was cracking and poking outward in places. It also wasn’t spinning true. I replaced mine at the same time as water pump, and I got a leak fixed in the radiator. It’s convenient to go...
  22. 1987 GMC Jimmy

    84 Short bed

    Any trades, partial or full considered? Interested in seeing pics if the price is right.
  23. 1987 GMC Jimmy

    Milky oil after 1984 K10 305 top end rebuild.

    It’s gonna be big and beautiful and China’s gonna pay for it?
  24. 1987 GMC Jimmy

    Acc fuse

    I would check the cigarette lighter first, especially if it’s been used to run constant 12V to various accessories.
  25. 1987 GMC Jimmy

    U-joint replacement recomendations

    I’ve gone with the DANA-Spicer serviceable. They’ve been fine, but I can understand the theory behind sealed ones. Whatever you do, I’d say order them online because they’re a rip off at the store!

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