Re: Failed Emissions Inspection. AGAIN!!!!!

["Harold McElraft" <hmcelraft@xxxx>]

Robert

Your system is way out. Something is not working at all. We really 
need to know CO reading and the CO2 reading to better pin point 
fault but I am guessing that the O2 sensor is not working or the 
Lambda circuit is shut down; especially if you got descent spec 
readings 12,000 miles ago. The system is probably "rich" which the 
default condition for an O2 sensor failure. If the frequency valve 
is not working the lower chamber pressure in the fuel distributor 
has probably increased also causing a "rich" condition. Spark 
problems do not seem likely to me.

I suggest checking the lambda circuit first. That includes the RPM 
relay functions. The diagnostics can be rather tedious and you 
should have the DMC Technical Information Manual to guide you. Check 
the fuse, check all connections - disconnect, inspect and reconnect 
is a good idea to be sure everything is secure. Turn the key to run 
and listen for the buzz of the frequency valve. Start the car and 
listen for the buzz. Use a stethoscope if necessary, but it has to 
be buzzing. There is away to check the O2 sensor but if I were you I 
would just replace it.

If the system has proper function the engine should be constantly 
hunting the ideal fuel-air mixture. The classic fast hunt - I love 
that sound.

If you wish you can contact me off line and we can discuss further.

Harold McElraft - 3354