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Previous Thread Next Thread Print Thread Rate Thread Page 3 of 3 1 2 3 Re: Check Engine Light [Re: JeepMedic] #377920 01/21/04 05:26 AM Anonymous Unregistered possible fuel pressure regulator failure? Re: Check Engine Light [Re: JeepMedic] #377921 01/22/04 07:50 PM Anonymous Unregistered if the exhaust manifold has a crack in it air (oxygen) will go in. The oxygen sensor (new or old) will read 'lean'. The ECM will add the maximum amount of fuel at all times, trying to make the O2 sensor go rich. So you will burn more gas than you would normally. The ECM will turn on the check engine light and give you the lean code 51 on pre OBDII systems Re: Check Engine Light [Re: JeepMedic] #377922 01/22/04 07:57 PM Anonymous Unregistered I'd like to add that the engine will run just fine, probably more power and smoother if the O2 sensor is reading lean. More gasoline, more power. It's easy to check the O2 sensor. Attach a digital voltmeter positive to the black/dark green wire, negative to the engine block. The voltage should swing between 0.1 and 0.8 Volts DC continuously.If the sensor is new and the reading is stuck at 0.1 Volts you have a crack in the exhaust manifold, end of story. Re: Check Engine Light #377923 01/22/04 09:51 PM Anonymous Unregistered i don't agree with more fuel more power unless the vehicle's stock programing is set to run under 14.7:1 also to tell if the O2 sensor is getting old it should switch voltage 8 times in 10 seconds minimum. Page 3 of 3 1 2 3 Moderated by  4x4Wire  Hop To Mitsubishi Forums ------  Mitsubishi 4x4 and SUV Tech  Mitsubishi Diesels  Mitsubishi ArchiveToyota Forums ------  Early Toyota Trucks  Toyota 4Runner, FJ Cruiser &...  T100 & Tundra Forum  Tacoma Forum  Toyota Tech ArchiveJeep Forums ------  Jeep Talk  Jeep TechIsuzu Forums ------  Isuzu 4x4 & SUV Talk  Isuzu 4x4 & SUV Tech  Isuzu DieselsKia Forums ------  Kia Talk  Kia Sportage & Sorento TechOff Topic Chat ------  4x4 Gallery  Off-Topic Chat  Recreational Access & Land ...  Politics4xForums ------  Outdoor Gear  General 4x4 Discussion  Tools and Fabrication  General Communications  Amateur Radio  GPS and MapsParts Bin ------  Private Party - Garage Sale  Private Party - Items wanted  Vendors, Hot Deals, Group Buys4x4Wire Back Yard ------  Suzuki Forum  AZ Crawler Crew  Cal-Nev Crew  General Ford 4x4 & SUV Forum  General Dodge 4x4 & SUV Forum  General Chevy 4x4 & SUV ForumFeedback & Testing ------  Problems, Questions, Suggestions4x4Wire Staff ------  Forum Moderators  Problem Threads Print Thread Switch to Threaded Mode 5 Excellent 4 Good 3 Average 2 Bad 1 Terrible

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