How to adjust fast choke with auto tranny?
This started out with me driving my car for a while and everytime it sat for 20-30 minutes in 80F weather, it would go into fast idle when I started it (~1200 rpm). I'd sit and wait for it to come off of fast idle by blippin the accel to avoid slamming the auto into GO. It finally does drop to about 800 rpm, but it takes forever.
I thought I could fix this by 'tweaking' the choke so I drilled out 2 of the 3 rivets (ground the head off the bottom rivet) and adjusted the choke. It's held in by 2 upper screws. This worked fairly well but seemed a little cold nature which makes sense, since I had the t-stat out too flushing the system. Now a new t-stat is back in and I'm still having problems.
When the car was warmed up, I adjusted the base idle so it would barely idle without dying. Then I adjusted the screw on the throttle control diaphragm for an 800 rpm idle. Life was good!!!
Get in the car this morning pump gas 2 times and it starts up. After a 3-5 seconds it tries to die on me and I think this is due to the choke being too far open. Anyway I kept it running by pumping the gas. I guess the choke needs to be richened up some, but after I got to normal operating temp, it still wanted to die at an idle and did once. Same thing happened when I left work this evening, ran crappy the whole way home. When I got home it sat for maybe 10 minutes and I go out to adjust the base idle screw. The damn thing started and idled just fine like I made the adjustment to begin with so now I'm really scratching my head.
Is the only way to adjust the choke by rotating it in the housing? I guess there is a critical sweet spot that has to be met without much room for too lean or too rich?
Does the idling real low when it's cold sounds like I have a vacuumn leak causing this or is there some part on the car that's failure is like this? I've got the air cleaner off now with 2 lines plugged and going to drive it tomorrow like that to see what happens.
I appreciate any guidance/suggestions because this is getting old... :mad:
Thanks!