1991 240 computer codes....HELP...

2-3-1 = Fuel system compensating for rich or lean mixture. I had this one. It turned out to be a stuck idle control valve. Cleaned it out and worked fine since. 2-2-1 = Fuel system compensating for extremely rich or extremely lean running condition at cruise. You may have some vacuum leaks or cracks in the intake boot. Check where the hoses connect. could also be the O2 sensor. 1-1-3 = fault in fuel injectors. Oh oh. Could be a number of things here. Seals, dirt, wiring...and gasp the ECU.

Hope this helps. Steve T. Slade 1990 245

In general: High idle is too much air or not enough fuel. Low idle and stumbling is too little air or too much fuel.

You have a high idle with high fuel consumption. Kinda hard to achieve under the general rule. So you may have multiple problems.

Make sure you have NO vacuum leaks, anywhere, and the AC control is OFF. AC control kicks the idle to 1000RPM.

The excessive gas consumption might be a bad ECU temp sensor. Best checked at the connector to the ECU. Or rare, bad fuel pressure regulator.

Since you have a 113 code, as part of a preliminary check, loosen, clean the terminals and tighten the two 10mm size nuts with wires underneath them on the intake manifold. These are the grounds for the ECU and the injectors and the reference ground for the ECU. Any electrical fault with the ground will not allow the injectors to function properly.

Duane

If there's a junkyard nearby grab a spare fuel pressure regulator, they're cheap used, kinda pricey new, and the easiest way to diagnose one is to swap in a different one.

THANKS FOR THE RESPONSES ALL OF YOU HELPFUL PEOPLE. I THINK I FIXED THE CHECK ENGINE LIGHT ISSUE....WHAT I DID WAS REMOVE AND REPLACE THE FUEL PUMP FUSES (2) AFTER ABOUT TEN SECONDS...THE LIGHT IS NOW OFF.....AND I AM A HAPPY MAN. I READ THAT THIS MAY HELP AND IT WILL RESET THE FUEL PUMP MEMORY...CHEERS TO YOU ALL..