robster66

iTrader: (1)

How do I adjust the idle on a TBI carb? It seems pretty high around 1.3k

Ronny

iTrader: (1)

TBI or Carb. TBI is really not adjustable. RPM is set in chip aka .bin. Maybe a vac leak. Or slop at butterfly shaft allowing air to enter.

Brandon2350

What is it specifically that your trying to do? Are you trying to raise or lower your idle and why. If you can give some specific details we may be able to help you better.

Brandon

MarkAJ86

Seeing as he said its high at 1300rpms i think he wants to lower it.

Jason89RS

iTrader: (2)

Yes there is a way to adjust your RPM's on a TBI, but I would first look at if you have a vacuum leak, increased base timing or the IAC needs to be adjusted, cleaned or replaced which may be causing he high idle. To adjust the idle you'll need to find aluminum plug on the front of the TBI by the throttle linkage. Remove this plug. Behind that is a screw (most likely torx) that you can use to adjust you're idle speed. You'll want to use an external tach rather than the one that's in the car.

Brandon2350

If your setup was ok and you changed nothing but it started idleing up higher, you definately dont want to remove that aluminum plug and attempt to lower your idle. This is usually done by experienced tuners when you have changed the airflow charestics of the motor. Changing this will definately change a lot more than your idle.

Check the items from the member above that he mentioned before even thinking about popping the plug.

Ronny

iTrader: (1)

Look at IAC pindle to determine if it is working or very dirty. Key on engine off it should move. Check your hoses to TBI for a vac leak.