1989 Deville

Car failed the nox .
 
Cat and  O2 sensor changed...  now   check engine light flashes when
idling in park intermittently..
 
Does the  computer need resetting with the new  smog crap installed?

 

quote:

ORIGINAL: gopher

Car failed the nox .

Cat and  O2 sensor changed...  now   check engine light flashes when
idling in park intermittently..

Does the  computer need resetting with the new  smog crap installed?

I would reset .. nothing to lose.

your car has an air pump?
if it does, test it, check the hoses, make sure the new CAT has the air inlet hooked up and working.

also, check the codes - the flashing light

On a 1989 Cadillac ses light should not flash, if it comes on there should be a code stored. However, if some one put at jumper in the ALDL located under center of dash it will flash , I would check for it. Make sure EGR  works because thats what it there for, to reduce NOx Hope it helps

Thanks for the info.
 
Will check them out...
 
Does dealer need to reset computer?

computer does not need reset. Steel tubes under throttle body tend to carbon up, can be cleared with 3/8" drill bit. Does engine have spark knock with timing set correctly on 91+ octane?

Hi.
Been away for couple of days..
 
Thanks for the tip. will check it out..
no knock on 91 .   Never had any pinging with her all the years I ve had her...

Is timing set correctly?