Propane Idle Adjustment - Determination Guidelines

84chrysler5

Models


1985 Model Year Vehicles


Subject


Guidelines For Determining the Use of Idle Mixture Adjustment


Index


FUEL

Date


10/1/84

No..


14-46-84

P-4283C
This bulletin should serve as a guideline to help determine when a propane or "CO" method idle set is to be performed.

The propane or "CO" method idle mixture adjustment should only be performed if it is determined necessary by the propane or "CO" method idle check in the respective year Driveability Test Procedure books or service manual. More specifically, propane or "CO" method idle mixture adjustment should only be used if an idle "problem" still exists after normal diagnosis has revealed no other faulty condition such as incorrect idle speed, incorrect basic ignition timing, faulty hose, or wire connections, etc. It is also important to make sure the EFC/ESA combustion computer system is operating properly. Adjustment of the idle mixture should also be performed after a major carburetor overhaul.

A guideline of conditions for determining whether a propane or "CO" method idle set is needed is attached.

The conditions listed below are affected by idle mixture adjustment:

^ Rough Idle Warm ^ Breakaway Sag-Light Throttle Tip In
^ Decel Die Out ^ After a Major Carburetor Overhaul

The conditions listed below are not affected by idle mixture
adjustment:

^ Spark Knock ^ Poor Fuel Economy
^ Road Load Surge ^ Decel Bucking
^ Long Cold Crank ^ Cold Start Die Out
Time ^ After-Run (dieseling)
^ Lack of Power on ^ Cold Rough Idle Acceleration

POLICY: Information only