Re: Lambda sensor removal...

["David Teitelbaum" <jtrealty@xxxx>]

There are many other things to check before you go after the O2 
sensor. There can be NO vacuum leaks. If it has been a long time do a 
COMPLETE tune-up with CORRECT parts. If it's been 30,000 miles since 
the last time (or more!) check the valve adjustments. Have the fuel 
injectors cleaned and tested. Make sure the 3 brass screws are closed 
and the idle motor and micro are working. If the frequency valve is 
buzzing then the O2 sensor is probably good enough for idling. For a 
complete description of the Lambda circuit and diagnostic procedures 
refer to the Workshop Manual. To adjust the mixture with a DWELL meter 
it has to be an old analog (needle) type. The newer digital display 
type meters won't be able to read the fluctuating voltage. Don't try 
to fix the idle by twiddling the mixture screw. Just make sure there 
is a plug in the housing over it and it isn't leaking. A properly 
set-up and operating PRV won't run right without the lambda system, it 
adds a little fuel to make the air-fuel ratio correct. With a dead O2 
sensor the Lambda will revert (fallback) to a fixed value. The big 
symptom would be a loss of power and terrible acceleration. It is even 
worse if the Lambda system is dead completely.
David Teitelbaum
vin 10757


--- In dmcnews@xxxxxxxxxxxxxxx, "Adam" <acprice1@xxxx> wrote:
> This weekend I tried to perform the lambda sensor removal/bypass as 
> explained in the DMCnews tech section in the article by Knut. Well I 
> hooked up the voltmeter, but the numbers constantly fluctuate and 
> they never stabilize enough to make any accurate adjustments. My car 
> has idled crazy ever since I've owned it. Could this be a bad 
sensor?
> 
> Also, what exactly is the circuit operation with the lambda sensor 
> unhooked? The computer will recieve no signal, so what will the 
> frequency valve do, and with the lambda gone, is the freq valve 
> necessary?
> 
> thanks,
> Adam 16683