Re: [DML] Setting CO mixture

["Dave Sontos" <dsontos@xxxxxxxxxxx>]

First check the big connector on the ECU behind the drivers seat, under the
shelf, make sure its firmly seated. In fact remove it and reseat it. Also
check to make sure you have a good ground connection to the ECU bracket.
I've run a separate ground wire from the engine block directly to the ECU.
Check and make sure the connection from the CO sensor is connected. If none
of these change anything you may need to hookup with another D owner and try
a swap of the ECU to see if that fixes it. I think John Hervey sells
refurbished ECU's.

Dave Sontos
vin02573

----- Original Message ----- 
From: "Phil Priestley" <phil@xxxxxxxxxxxxxxxxxx>
To: <dmcnews@xxxxxxxxxxxxxxx>
Sent: Monday, January 31, 2005 6:21 PM
Subject: [DML] Lambda system/duty cycle
>
> Just got the car back from the shop after having the heads fixed where
> they had corroded through. Runs great now except for one thing.
> It was running a bit rich so I hooked up the trusty dwell meter to set
> the CO mixture and discovered that the duty cycle stays steady at about
> 54 percent or so. I can adjust the mixture until it leans out and dies
> or till black smoke is billowing out the tail pipes and the duty cycle
> stays the same. It's like the ECU has went into limp home mode for some
> reason. The O2 probe is only a year and a half old. I pulled the wire
> on it and adjusted the mixture until the voltage was about 720 mV and
> it idles smooth but the the duty cycle remains in limp home mode and
> the exhaust still smells a bit rich. I checked the continuity on the
> WOT switch and it is working fine as is the idle speed microswitch.
> It's idling steady at about 750 rpms and not idle seeking.







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