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

Hello,
My 91 240 check engine light is on. I checked the codes and it keeps
coming up as..
231, 221, 113, 221 over the last week or so. I switched the Air Mass
Meter and the
Oxygen Sensor with my other 240 and it did not help, the check engine
light is still on.
When I clear the codes and start the car, the light comes on in about
one or two seconds.
I was wondering if anyone has a clue for me.... fuel pump? fuel
filter? fuel pressure?
She drives okay, idles high and seems to eat too much fuel.

Please help...
Joseph Segura

 

231, 221, 113, 221 over the last week or so.

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..