K
idle adjusting
xMariox
+1y
hey, just a quick question. i got a 87 b2200 and i cant seem to get this truck to idle smooth under 1200 rpm, when i got the truck the vacum lines were all mixed up and im pretty sure i put them all in the right place i went by a parts truck i already have. ive tried adjusting the choke, idle screw, fuel/screw. and still idles way to high. its auto for one thing. but can u guys think of anything that i might not of thought of already cause if im not mistaken its only supose to be running at about 900 rpm right?
dssur
+1y
give it a good sized vacuum leak and see what happens. Like the brake booster line. If it stalls or runs slower, you are lean. If it runs faster, you are rich.
My bet is on rich. Unfortunately the feedback carb is a hunk of doody. After 18 years of faithful (read: unmaintananced) service, it usually needs a rebuild. You can rebuild it, get a NOS carb or buy a Weber. Believe it or not, the weber is actually chepeast and gets rid of all the slimy octopus of vacuum hoses.
My bet is on rich. Unfortunately the feedback carb is a hunk of doody. After 18 years of faithful (read: unmaintananced) service, it usually needs a rebuild. You can rebuild it, get a NOS carb or buy a Weber. Believe it or not, the weber is actually chepeast and gets rid of all the slimy octopus of vacuum hoses.
xMariox
+1y
so russ your idea would be to rebuild the carb and it would run alot smoother? cause i got a parts truck in my garage i could just take the carb right off of if needed. and i know that truck is running good. i just thought maybe i was missing a ajustment or something and thats why i couldnt get this running proporly
dssur
+1y
Originally posted by xMariox
so russ your idea would be to rebuild the carb and it would run alot smoother? cause i got a parts truck in my garage i could just take the carb right off of if needed. and i know that truck is running good. i just thought maybe i was missing a ajustment or something and thats why i couldnt get this running proporly
Unfortunately, the mazda feedback carb think it knows the best way to do everything, thats what all those vacuum lines are, bleeds, to shape the mixture. If just ONE is stuck, you could be running rich, or lean, or high idle, or low. etc.
Dont take me too seriously here, but its my hmble opinion that mazda factory carbs wouldnt even make suitable paperweights without screwing it up.
so russ your idea would be to rebuild the carb and it would run alot smoother? cause i got a parts truck in my garage i could just take the carb right off of if needed. and i know that truck is running good. i just thought maybe i was missing a ajustment or something and thats why i couldnt get this running proporly
Unfortunately, the mazda feedback carb think it knows the best way to do everything, thats what all those vacuum lines are, bleeds, to shape the mixture. If just ONE is stuck, you could be running rich, or lean, or high idle, or low. etc.
Dont take me too seriously here, but its my hmble opinion that mazda factory carbs wouldnt even make suitable paperweights without screwing it up.
DenaturedAlcohol
+1y
Most of the problems I have had out of my dawgs over the years are carb problems. Vacumes and what not will have your mix all jacked up if something is stuck. Follow thoes routes suggested by Russ and I suggest getting a repair manual for it and replace thoes vacumes a new if necesary, choke it and see what happens then see if you can pop one off and kill it. That really all you can do. The mixtures changed on my 87 I had all the time. Never understood why it did but I believe that fuel screw worked loose.