LUVTruck.com

Hello.

First time I have used these forums, so hello. And I bought a month ago a 1980 Chevy Luv 4x4 mikado. It has a rebuilt motor with great oil pressure, new altenator, starter, clutch, tires. All and all a good pickup. I did buy it in not running condition, I had to get a new distributor. I have it running now but it misses under power. I will describe this problem in much more detail.

So as I said I bought this pickup when it was not running and had it towed home. I had to get a new distributor, I bought a remanfucatured unit from my local carquest store. Put it in and it was running but misses like the carb was out of tune and idling very high. Got it to my dads shop and started tuning the carb, got it to idle at 800 rpm and idles very smooth. I set the timing, checked the dwell on the points and got the idle mixture set. The pickup idles fine now. The problem is when I am driving it when I try to accelerate it cuts out and starts backfiring. When I left off of it and cruise, it runs fine. It is not drivable really in this shape, it barely goes 55 mph and doesnt run smoothly when it does go that fast. But I stop the truck and it idles smooth with no backfiring or missing. It idles like a champ. I am thinking I need to pull the carb apart and rebuild it, I allready have the kit to do it. But before I take it apart I want to make sure I am not missing a much simplier problem. There are two electronic devices on the side of this carb that I have not dealt with before... one is an anti-dielsing solenoid and a Coasting Valve assembly... according to the manual I have. Could one of these be the culprit? I have never worked on a carb that had these devices... I have worked on american carbs like holley and quadrajet. If these devices are not the problem, is there anything else I should check before I take the carb apart?

What is more interesting about this problem is that when it is cold, it does not seem to be such a probem... once it warms up it misses and backfires more.

Thanks for your help

well im going to go through the basics of what i did
buy a carb kit... bfr you pull the carb apart...
first get some carb cleaner and spray it in to the carb intake line a good amount is needed... then take an air compressor and blow out the the carb (use less then 20psi)
i placed a papet towl in the intake to absorb the gunk that could have built up (this helps with basic cleaning of the carb jets)

then follow the instructions in the carb kit... my issue was in the seals between the carb and the intake as well the float was out of adjustment and the spring in the float valve was shot...

i was having the same issues you were having.... with back firing and stalling out on take off and as well its been as low as 17*f and the truck would start fine and idle like a champ...


neither of those electronic devices are actually wired on my carb and other then slight dieseling at idle (i set idle a little low around 750rpm to compensate you have idle air speed needle to compensate for that)

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Friends don't let friends drive stock...
76 mikado, emissions delete, dual alternator, rejetted 1.9 carb swap, non factory body lines
soon non points distributor, single (semi sealed beam) head light conversion

check your fuel pressure and fuel filter, these little carbs run out of fuel very quickly, also check your timing advance and hoses on distributor, occasionally a backfire will occur when there is a vacumn leak and the timing reverts back to its idle setting when you press on the accelerator pedal. just a couple of problems I have encountered on Luvs.