Stephen0523

Hello. I have a 1984 Delta 88 with the 307 engine. It seems to be idling slow. Would someone have some pictures or video links as to how I can increase the idle?

77ricbaez

This is a Rochester 2bbl, but the process is the same with most carburetors


I wouldnt touch the idle mixture screws, get a flat head screwdriver and turn the curb idle screw (on the driver's side) in to increase or out to decrease
If you got a tach I would adjust to 700-800 RPM Park and 500-600 Drive. If not just ear it.

77ricbaez

Also if you are having other symptoms like backfiring, I would check the timing as it has an impact on the idle as well. Actually if I were you, I'd make sure the timing is proper. Not sure about the 307s but for 350s youd want 20 degrees BTDC at 1100RPM. Check the Emissions sticker in the engine bay, it will tell you all you need to know.

joe_padavano

Once again, the 307 with CCC MUST be adjusted following the procedure in the Chassis Service Manual EXACTLY. For starters, the idle speed screw on the Qjet does not normally control the idle. The Idle Load Compensator is the primary device for speed control. There is a process for adjusting this. Read the manual.

BlackGold

And I'll just throw this out there:


If you're looking to increase the idle speed on an '80s engine, chances are you're just trying to cover up the real problem. You might have a vacuum leak which is affecting the mixture, or you might have a leak in a vacuum hose (or completely disconnected) which is screwing up what the computer is trying to do. Yes, increasing the idle speed will help keep it from dying, but the root problem is still there.

Arrowstorm

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