On Wed, 05 Oct 2011 03:42:25 GMT, someone@some.domain   
   (someone@some.domain) wrote:   
      
   >In article <0ean87hqkt0vlopphhvsapvqsoijj0bqoa@4ax.com>, clare@snyder.on.ca   
   wrote:   
   >>On Tue, 4 Oct 2011 08:34:22 -0700 (PDT), imola23@msn.com wrote:   
   >>   
   >>>My 87 22R w/carb exhibits an extremely lean condition.  Here's the   
   >>>long story.  I installed a rebuilt carb years ago due to the original   
   >>>carb being all carbonized and  gummed up and not allowing the   
   >>>secondary to open.  Symptoms were very poor gas mileage and black   
   >>>smoke out of the exhaust  After the rebuilt carb installation the   
   >>>truck never ran right.  Symptoms were: NO power during normal   
   >>>acceleration; pushing the accelerator further made the truck go   
   >>>SLOWER.  When pumping the pedal with little pumps of the pedal   
   >>>(squirting gas into the primary), I could feel surges of acceleration   
   >>>with each little pump.  As expected, no amount of idle screw   
   >>>adjustment had any effect.  Basically the truck was almost undrivable   
   >>>and the carb vendor showed NO concern.  Out of desperation I rigged a   
   >>>short piece of thick wire to hang down into the secondary and keep the   
   >>>plate from opening more than 13/32in.  With that setup it would drive   
   >>>acceptably but mileage suffered and reading the plugs showed the   
   >>>mixture to be rich.  So I removed the vacuum cap on the upper-most   
   >>>capped port of the three capped ports on the passenger side of the   
   >>>carb.  The mileage improved a little (18mpg) and  the plugs looked   
   >>>better.  I have been running it like this for a couple of years.  But   
   >>>recently it's been stalling while idling and backfiring during   
   >>>accelerating.  The secondary was beginning to get sticky.  So just   
   >>>yesterday I installed a new rebuilt carb and I was hoping that the new   
   >>>unmodified carb might be the answer.  No luck; the lean condition   
   >>>problem remains.   
   >>>   
   >>>I will accept any and all diagnostic suggestions.   
   >>  You need to make 100% sure you don't have any vacuum leaks, and that   
   >>you DO have the right carb. The 22R engine was not known for carb   
   >>problems, on the whole. IF you are SURE you have no leaks,and have the   
   >>right carb, you need to check the number on the primary and secondary   
   >>main jets, and then obtain a set of larger jets. IIRC Holley jets fit   
   >>- cannot remember from what carb - but I THINK it is the ones from the   
   >>holley single barrel carb used on Dodge slant six and AMC engines - if   
   >>you can't get spare Toyota ones. I have drilled jets in the past with   
   >>good success - but you want a fair number of off-sized spares if you   
   >>go that way. The primary main is likely about 2 sizes small for ideal   
   >>driveability, from past experience.   
   >>My suspiscion is you have a 20R carb if it is behaving as badly as you   
   >>say.   
   >   
   >main was fussy about the filters.  if i remember, there are two, one in the   
   >lines near the carb and one on the frame.   
     The filters will cause problems at speed and under load - and a   
   second or two after hitting the gas. - but a good idea to check fuel   
   flow and pressure to be safe.   
      
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