[DML] Re: Lambda system/duty cycle

["David Teitelbaum" <jtrealty@xxxxxxxxxxx>]

You are correct, the Lmabda duty cycle should be pulsating. Since it
is not you need to check several things. Refer to D:04:14-15. The
Lmabda will be steady under the following conditions;
O2 sensor disconnected
O2 sensor lead grounded
O2 sensor lead disconnected with 1.5 volts applied
Full throttle
Coolant temp below 59 degrees f or sensor defective or wire grounded

I would first check out the coolant sensor and make sure it is
connected since you say the motor was worked on. Maybe they did not
connect it or knocked the wire off and didn't notice it. You could
also have a grounded wire going to the  micro switch. In any case
check out the circuit that goes to the micro and the thermal switch.
This can cause the sytem to be steady with a duty cycle bewteen 50 and
60 and run rich.


--- In dmcnews@xxxxxxxxxxxxxxx, Phil Priestley <phil@xxxx> wrote:
> 
> 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.
> Where should  I begin looking?





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