1990 Graduate Computer Code 1223. Help please. - Alfa Romeo Bulletin Board & Forums
LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 10-27-2005, 03:38 PM Thread Starter
Registered User
Join Date: Oct 2005
Location: Phoenix, AZ
Posts: 8
1990 Graduate Computer Code 1223. Help please.

I have a check engine light problem with an erratic throttle idle at times. The code is showing 1223. I believe the throttle position sensor is bad. When I disconnect the sensor when the erratic idle happens, I don't realize much change in the erratic idle. Does anyone know what code 1223 is or any ideas on what could be the problem? Thanks for the help.
kjd186 is offline  
Sponsored Links
post #2 of 2 (permalink) Old 10-27-2005, 04:34 PM
Registered User
MrT's Avatar
Join Date: Jan 2004
Location: Poquoson, VA
Posts: 3,499
From http://www.digest.net/alfa/FAQ/164/diag.htm

The heated lambda probe regulator inner adjuster reaches the minimum
or the maximum value of correction."

Essentially, the mixture is out of spec either rich or lean. My limited experience is that this indicates an air leak (unmetered air) and the AFM signal results in too little fuel. The O2 sensor (lambda sensor) reads lean exhaust and can't correct within the limited range it is allowed to monkey with things. Of course, it might also mean the lambda sensor is bad. Hook a voltmeter up to the lambda probe (pics on the alfabb somewhere) and squirt some hydrocarbons into the intake and see whether the engine smooths out and the signal comes up. If so, then you are lean. If the signal comes up and the engine sags further, then it may be over-rich already because the lambda probe is lying and needs to be replaced.

MrT is offline  

Quick Reply

Register Now

In order to be able to post messages on the Alfa Romeo Bulletin Board & Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

For the best viewing experience please update your browser to Google Chrome