1990 Cadillac Deville 1990 Deville wont pass smog runs rich

JOSEPH RUIZ

MEMBER
1990 CADILLAC DEVILLE
V8
FWD
AUTOMATIC
146,000 MILES

Is there some type of computer relearn procedure for this modle. Is taking it for a long drive a posibility of resetting the computer to stop it from running rich?

Saturday, April 5th, 2008 AT 12:34 AM

6 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Try getting the things below checked out-

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

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Saturday, April 5th, 2008 AT 5:02 AM

RASMATAZ

MECHANIC
75,992 POSTS

Did you replaced the coolant temperature and the oxygen sensor with an OEM parts?

Also have you checked the actual fuel pressure? Get this done and comeback with the readings. Do the test with and w/o vacuum to the regulator-

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Saturday, April 5th, 2008 AT 5:24 PM

JOSEPH RUIZ

MEMBER
9 POSTS

Yes, replaced with oem parts, fuel pressure was like 35 with, and 40 w/o vacume to reg. No trouble codes what so ever. Would apriciate further ideas or advice. Thank you very much for your time!

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Monday, April 7th, 2008 AT 5:48 PM

RASMATAZ

MECHANIC
75,992 POSTS

Try relearning procedures below

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Tuesday, April 8th, 2008 AT 2:08 AM

JOSEPH RUIZ

MEMBER
9 POSTS

Mr. Razmataz, did the computer relearn procedure with no luck, but check this out. My old computer did'nt recognize any problems, and no check engine light never came on. Put the new one in and light came on and it recognizes the map to be bad, but it checks out o.K plus its also new!SO. We sent the new computer back to switch with another new one, it shoulld be here today. If light comes on again & everything checks out to be o.K could there be somthing wrong with my distriburator?What would be my next move?