Adjusting Carbuerator ????

[Six_Legal]

I have a 1985 cutlass supreme 3.8L and I want to know how to adjust my carb properly. It seems as though it is running to rich and causing my car to hesitate when i accelerate from a stop position . I have changed the fuel filter, oil filter, transmission filter and fluid, air filter, spark plugs and wires. and the problem persist. Thanks in advance for help

 

[RITTER]

It is more than likely a bad fuel mixture solenoid :idea:

 

[88hurstolds]

Most likely it's a bad O2 sensor or mixture solinoid.
If the connection isn't properly connected the default is a rich setting...

 

[DoubleV]

While it certainly could be the MC solenoid I would personally bet against that. They rarely go bad and when they do it defaults to full rich which usually smooths the idle, not make it rougher.

Six_Legal, your problems could be almost anything. Could just be a vaccum leak or maybe it's just time for a carb rebuild. I would start with checking the dwell, timing, TPS, and look for vacuum leaks.

 

[RITTER]

It seems as though it is running to rich and causing my car to hesitate when i accelerate from a stop position.

If the idle mixture is rich it will cause accelleration hesitation because of the excess fuel building up while idling :idea:

... it defaults to full rich which usually smooths the idle, not make it rougher.

He mentions that it just hesitates at acceleration, doesn't say anything about it running rough :|

 

[9a pilot]

Most likely it's a bad O2 sensor or mixture solinoid.
If the connection isn't properly connected the default is a rich setting...

This. I had the benifit of an old Snap-on red box scanner which quickly pointed out a lazy o2.
My m/c was bad,too. I had intermittent check engine light that would come on when the car would idle and turn off a few seconds after either goosing it or driving away. The carb was leaking and must have been puddling some fuel into the plenum as the engine would chug, lope like it had a big cam, and dump black gas smelling smoke after start for about a minute. All the external diaprahgms were blown/cracked/dry rotted. I'm lucky National Carburator is local. They rebuilt my original dual jet in about a week for a 1/3 the price of getting something from any of the parts chains.

 

[DoubleV]

... it defaults to full rich which usually smooths the idle, not make it rougher.

He mentions that it just hesitates at acceleration, doesn't say anything about it running rough :|

That is correct, I missread and thought he was suffering rough idle too. If it's just a simple hesitation, then the accel pump could be the issue which was suggested to him last week when he asked pretty much the same question on another thread he started....

So Six_Legal, did you check/replace the accel pump yet?