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Down to the MAF Sensor or Cat Converter.


 
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The Dajaaza
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Joined: 14 Dec 2005
Location: St. John's Newfoundland

PostPosted: Tue Jan 10, 2006 3:55 pm    Post subject: Down to the MAF Sensor or Cat Converter. Reply with quote

97 TJ, 2.5litre

Just before Christmas, just before a trip to the great white north, I was having trouble with a front O2 sensor error code. By the advice of my shop as well as a couple of replies made to me here, I ignored the code and headed out on my trip (December 23).

There is a usual gas stop that is made about 3 hours into this trip at a town about half way across the island. In my old 90' 2.2litre Celica, I'd stop here and spend just over $30 Canadian gassing up. Knowing that Jeeps are a little harder on gas, I figured that I'd be spending about $40-45 on fuel, but instead, the tank took $69! I was blown away. With a tight schedule, having to deal with ferry rides and the sort, I didnt have time to pull into a shop to buy a new O2 sensor so we just kept truckin.

The next night, and over $300 in fuel later, we finally arrived at our destination and there was a call waiting for me from my father. (we stopped at his place halfway through the journey). He said that when we left his house that morning there was mountain of soot left in the driveway and the Jeep was pure flooding fuel!

So we extended our visit a day and I got the Jeep into a shop (December 27) to replace the O2 sensor as well as the air filter.

By no question, that did the trick! The Jeep ran great and we only burned about half the money in fuel coming back.

Last thursday (January 5), after driving about an hour, I began to notice some hesitation in the vehicle and in no time the engine light came back on. She had a hard time maintaining speed but if I put the pedal to the floor, she would kick in and climb again. So I ventured back to the shop and was told of a reading of the rear sensor acting up. I replaced that sensor yesterday and still have the symptom of hesitation after the Jeep reaches normal operating temperature.

Tonight, (January 10), the engine light came on and read "code 51".
Code 51 indicates a lean air/fuel mixture by an abnormally rich correction factor.

So I've since been searching for an answer, through various resources on the net, and it seems to come down to the MAF sensor, or the Cat converter. I just have a couple of questions about these two.

If it were the cat converter causing the trouble, would I only get hesitation after normal operating temp or would I feel this right away at cold start up.

And if it were the maf sensor, what chances are there of the check engine light coming back on to indicate this. Are these typical symptoms of a maf sensor? Would the mixture run lean from a bad maf sensor?

I'm not very familiar with the characteristics of either of these so any insight would be great,
J
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Code3TJ
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PostPosted: Tue Jan 10, 2006 4:51 pm    Post subject: Reply with quote

http://www.jeephorizons.com/phpbb/viewtopic.php?t=6870
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