1990 Cadillac Deville 1990 Deville wont pass smog runs rich

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

6 Replies

Tiny
RASMATAZ
  • MEMBER
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
Tiny
RASMATAZ
  • MEMBER
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
Tiny
JOSEPH RUIZ
  • MEMBER
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
Tiny
RASMATAZ
  • MEMBER
Try relearning procedures below


http://www.2carpros.com/forum/automotive_pictures/12900_c1_2.jpg




http://www.2carpros.com/forum/automotive_pictures/12900_c2_2.jpg




http://www.2carpros.com/forum/automotive_pictures/12900_c3_2.jpg




http://www.2carpros.com/forum/automotive_pictures/12900_c4_1.jpg

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Tuesday, April 8th, 2008 AT 2:08 AM
Tiny
JOSEPH RUIZ
  • MEMBER
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?
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Thursday, April 10th, 2008 AT 10:43 AM
Tiny
BUZZSAW
  • MEMBER
If you have no codes then there is nothing wrong with the car, the MAP sensor changes the air fuel ratio for different elevations, if your getting a code for it something is wrong with it, the code means the MAP sensor circuit, not just the map sensor
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Friday, April 11th, 2008 AT 5:12 AM

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