TRclassic3
Jedi Trainee
Offline
Hate to do it, but I couldn't find answers I need in the history. A little background first. SU H carbs. Rebuilt 2 years ago by Apple Hydraulics(by PO). Since acquiring the car it has always idled high, generally around 1300 to 1400. The idle scew for both carbs is backed out all the way, as is the choke adj. screw. Right after getting the car I had it checked out by professional and they noted he high idle and changed out the butterflys with no noticeable difference.
I also inherited a balancer and a color tune from the PO. I checked the balance. Dead on. I then proceeded to check with the color tune. I realized that I can't be sure of the results nor follow their testing scheme when I'm starting off at such a high idle. Any way, one of the carbs seems out of whack in that the color goes from blue to yellow when slowly apply more throttle, so that by around 1700 it goes to yellow and stays there, indicating a rich condition. The other carb seems to react more as indicated, and stays blue as slowly accelerate.
So, first, where do I start to try to get the idle down, and second how to approach the results from the one carb. I did do some playing with the jet height, but no appreciable difference.
Couple other notes. Plugs seem too black (DRY), exhaust color seems OK and idle note is constant, no missing. Sorry to ramble on but I figure the more info the better. Thanks
Ed
I also inherited a balancer and a color tune from the PO. I checked the balance. Dead on. I then proceeded to check with the color tune. I realized that I can't be sure of the results nor follow their testing scheme when I'm starting off at such a high idle. Any way, one of the carbs seems out of whack in that the color goes from blue to yellow when slowly apply more throttle, so that by around 1700 it goes to yellow and stays there, indicating a rich condition. The other carb seems to react more as indicated, and stays blue as slowly accelerate.
So, first, where do I start to try to get the idle down, and second how to approach the results from the one carb. I did do some playing with the jet height, but no appreciable difference.
Couple other notes. Plugs seem too black (DRY), exhaust color seems OK and idle note is constant, no missing. Sorry to ramble on but I figure the more info the better. Thanks
Ed