I had a idle problem with my 1984 3.0 V6 in ny Buick Century wagon. Well I overhauled it and it was not much better. Then switched out the base plates for one that had the limiter plugs removed at the base so I could adjust the idle mixure, and now it idles perfect!!!! But it falls on it face on take off like a bad accerator pump (new). There are many adjustments on this one and only changed the lower idle mixture scews. Here is a note I sent to another rebuilder....... The one on my car has never been apart until I rebuilt it and it now idles great but falls on it face on take off. There are 4 settings that are important on this model and and need spacial adjustment gauges, 1) Lean adjustment 2) Rich adjustment 3) Idle air bleed 4) Air Idle mixture adjustment. Thanks AL. Are there any Caruretor Spacialist from the 80s out there??? AL.
Not an expert by any means, but have done a couple. You'll need a few specialized tools to adjust the above mentioned items. There's also the possiblity of a bad Mixture Control solenoid. I have a virtually unused 'electronic carb & TBI adjustment kit' I got from Snap-On many years ago.....$200. That will make YOU the 'expert' then!! :grin: You'll also need a dwell meter when adjusting those carbs. Here is a link to the ad & pics of the kit for sale.
In order to adjust this carb, you will need a dwell meter used for six cylinder engine point adjustments. You will be adjusting the metering rods, idle bleed and the idle pick up for readings on this meter. If you have one, I can walk you through this adjustment. Are there any codes set in the computer? This will be the place to start. Ray
Ray, I may have found a problem. I swithched carburetor bowls and see a big difference. I'm going to take it out for a spin now and report back so please check back, AL :beer .
Okay Ray, I just got back and the car ran Great!!!! And if more members liked these older FWD Buicks I would show my FWD smoken burn out :3gears: with both front wheel (don't ask me why it's always lit up both ) Well it did set a code (44 Lean code) only at idle and think it because the lower idle mixture srews were turned out 6 turns from the seat and think they should have been closer to 2 1/2 - 3 turns out so the computer could see a dwell at the M/C solinoid that was more in range. AL.
Here is a email I sent to a rebulder........ Bob, I posted earlier I switched out bowls and the accelerator pump spray great and the dead spot is gone! The only thing I ran in to was a code 44 (lean code) at idle and hope this was because of the lower mixture adjustment screws were turned out 6 1/2 turns from the seats ( I readjusted them as you instructed in your last e-mail). What is a good M/C dwell at idle in closed loop to help the computor keep its 14.7 to 1 A/F ratio? Thanks AL.
