RE: 1991 Ford Explorer O2 Sensor Replacement

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RE: 1991 Ford Explorer O2 Sensor Replacement

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RE: 1991 Ford Explorer O2 Sensor Replacement - 8/23/2005 8:16:54 PM

cctxfish

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Didn't find anything the says what system your '91 is useing. You can retrieving codes from EEC-IV, but not an EEC-V without a scan tool. Haynes has a techbook that can help you retrieve codes, do a KERO test, and engine running codes. Sorry but '91 was one of those change over years, so the book may not help if its a EEC-V. EEC-IV 2-digit codes (91 and earlier models) code 41 is EGO sensor indicates system lean. So the sensor may just be reading 0.0V, open connector, or computer bad.

(in reply to cctxfish)

Post #: 11

RE: 1991 Ford Explorer O2 Sensor Replacement - 8/23/2005 10:31:34 PM

Ramrod48

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HUMMM , ODD , I know all the Autozone's here local will check codes for you, ( trying to sell you parts ), Well the DTC ports are totally different , You couldnt get one to plug in the other if you tried , , Your tester did it come with several adapters ?,,, It should tell you under the hood the sticker that has your tuneup spec;s what system you got, It will say , ECC-IV, or ECC-V

(in reply to retread)

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RE: 1991 Ford Explorer O2 Sensor Replacement - 8/23/2005 10:52:56 PM

Ramrod48

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Ok, looked up on the web, Innova 3145 , say for OBD1, which should be EEC-IV,,, where you plug the tester in , theres a small , single wire pigtail , that you gotta plug in the tester along with the main connector on the car , Right ??

(in reply to Ramrod48)

Post #: 13

RE: 1991 Ford Explorer O2 Sensor Replacement - 9/8/2005 3:03:06 PM

retread

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Thanks for all of the responses Was able to make the code reader work. Had a loose wire in the dtc. The KOEO test receives a 41C-NO HEGO sensor switching. The KOER test receives the following codes: 42R-HEGO always rich; 72R-MAP, MAF or BP out of range; and a 73R-Insufficient throttle response. Additionally, the engines idles smoothly, has sufficient power, but uses an abnormal amout of fuel. Also, at idle the engine pulls a steady 22 inches of vacum. I have replaced the O2 sensor, mass airflow sensor, inlet air temp. sensor. engine coolant temp. sensor, pcv valve, oil & filter, and the air cleaner element. Tested the CNAP solenoid and the throttle position sensor. Plan to test the O2 sensor and circuit with a multimeter tomorrow. Thanks again.

(in reply to Ramrod48)

Post #: 14