Very interesting take on explaining dwell. Ive worked with compu-quads in the past, cant say im a fan, but i have worked on them. We used a thin ruler to keep the tps plunger down when reinstalling the air horn, so not to break it. Good video!
The (MCS) Operate in a way that it is somewhat like a wave length, it pulses more to pull the rods in (lean) and less to richen the mixture, on cold startup (closed loop) the computer ignores the signals, as the engine heats up (open loop) the computer is controlling and monitoring all functions. I look at the CCC Feedback system as a Pre-fuel injection system.
So my carb use to make the ticking sound when the key was turned on but not started. Now it doesn't and I'm getting code 45 which is O2 sensor , rich condition, I have replaced the 02 sensor but no joy. Is the mcs stuck ? and can it be unstuck. Or can it be replaced. Does the ecm control it ? This is on a 84 El Camino 305.
The MCS cannot be unstuck. It must be replaced. Sounds like the rods the MCS controls are locked in the up position/ out of the jets. The ECM does control the MCS. It's an easy component to replace. There's a vid on YT of how to replace it. I think Classic G Body Garage made it.
It does sound like you're having a problem with the MC solenoid. It's an easy fix. I'd replace it with a new one from Ebay. I'd also try to free up the assembly, while you're in there. Some Scotchbrite and WD-40 should do the trick. Once you've got it moving again, make sure you recalibrate everything before you put the air horn back on.
Another great video! If you were in Europe, I'd pay you to come look at my '86 Caprice with the CCC Quadrajet. I still have the stalling when cold issue. This issue appeared after my alternator died, which I have since fixed. However, it still stalls even now. I noticed today that 2 screws are missing on the electric choke; with the screw housing broken off and missing on of them. So there's just 1 screw holding the choke in, and I can rotate it by hand to some extent. Surely this isn't good, but could it explain the stalling on a cold start? If I keep my foot on the pedal a bit for 2-3 minutes, it eventually settles into an acceptable idle.
Thank you! The choke issue may explain your cold start problem. If the choke can't stay closed as far or as long as it needs to be, you would expirence a stalling issue when the engine is cold. I would take the air cleaner off and watch the choke valve during a cold start. Make sure it closes fully after you pump the gas pedal, then start the car. It should open slightly as the vacuum breaks engage, but you should still feel it "holding" itself closed for a minute or 2 until things warm up.
I have removed the cat and air pump from my 85 t/a ,305, automatic tranny. will the tps and metering rod sensor still operate the same with the computer or would it be wise to go to a non electronic quadrajet and eliminate computer control for better operating performance and to eliminate a rich condition?
In most cases, getting rid of the air pump really shouldn't affect the computer too much. It may run a little rich at start-up, but it should even out as it warms up. I would leave it as is and see what happens. You can always change it out down the road. Plus, this way, you won't have to make changes to the lock-up torque converter, which is controlled by the computer.
I think you might be referring to the choke angle, which is still fully adjustable. I may have been unclear about that. My apologies. On the older choke, you could actually rotate the internals, to set the length of time the choke stays open or closed. turning it to the lean side would result in the choke opening sooner, the rich side would result in it opening later.
That's right. On the older model chokes, you could adjust it by turning the internals left or right to increase or decrease the amount of time it stayed opened or closed. The later model chokes were non-adjustable, meaning the amount of time they stayed closed was unable to be changed.
