1990 Cadillac Deville wont pass smog..HELP!!!

1990 CADILLAC DEVILLE
156,000 MILES • V8 • FWD • AUTOMATIC
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JOSEPH RUIZ
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my 1990 cadi sedan deville wont pass smog! its running 1 & 1/2 times richer than the max allowed.Ive replaced the cad converter & all sensors that can possibly make it run too rich.the diognostic test shows everything is fine,"but" the smog test has it running way too rich!! it allows for a max at 100 but its testing at 245 ! ever heard of this? please help.
Mar 31, 2008 at 2:06 PM
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RASMATAZ
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P0172/0175 Rich codes-

Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.
Mar 31, 2008 at 2:45 PM
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JOSEPH RUIZ
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all you suggested has been checked,any further ideas would greatly be appriciated. thank you very much!!!
Mar 31, 2008 at 8:04 PM
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RASMATAZ
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The only thing we got left is the computer
Apr 1, 2008 at 6:23 AM
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BUZZSAW
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[quote:53339e60c3="rasmataz"]The only thing we got left is the computer[/quote:53339e60c3]

does it run rough or is it idleing fast?
Apr 4, 2008 at 2:20 AM
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JOSEPH RUIZ
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it doesent run rouph at all it runs really great "but" it does idle a tiny bit , and i do mean a tiny bit rouph when i pull to a stop.ive had a new computer put in & its still running way too rich!have you heard of any recalls for this model?does the computer need to be reset in any way????help, its eating up lots of cash.any new ideas would be greatly appriciated. thank you !!!
Apr 4, 2008 at 4:38 PM
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JOSEPH RUIZ
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no it dosent really idle high or fast but it does run a tiny bit rouph when i pull to a stop,not enouph to be concerned about though ,ive had a new computer put in and still the same running very rich.have you heard of any recalls with this model? does the computer have to be reset in any way??any new ideas would be appriciated..thank you.
Apr 4, 2008 at 10:01 PM
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BUZZSAW
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[quote:2c9f8a20d3="joseph ruiz"]no it dosent really idle high or fast but it does run a tiny bit rouph when i pull to a stop,not enouph to be concerned about though ,ive had a new computer put in and still the same running very rich.have you heard of any recalls with this model? does the computer have to be reset in any way??any new ideas would be appriciated..thank you.[/quote:2c9f8a20d3]

test your injectors with an ohm meter, they should be around 13 ohms
Apr 5, 2008 at 5:29 AM