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kevin
Dodge Dakota
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10/27/2004
14:30:52
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 Subject: Wierd one.
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Message:
Recently bought a new car so the R/T finally had to go outside after 3 years of garage life. After sitting out I strangly noticed better performance. Quicker throttle response, more pep and over all better engine performance. How could this be? 2 days after loving zipping around town with the better performance I got a check engine light for an O2 sensor. Reset the PCM and the code is gone but so is the performance I noticed. Back to the "garaged R/T" feel. I have 2 hypothesis. The sensor was going bad or has been bad and sent a signal to the PCM but some how resulted in a better fuel mixture than before. Or the sensor is Bad and the mixture was wrong before and when it showed "lower than normal operating volts" the PCM was triggered into a proper fuel mixture. What do you think? I guess I could put a new one in and see what happens. I do know one thing. There was a difference from "garaged R/T" and "Curb R/T" because when I reset the PCM I felt it right away. Anybody ??????
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FloriDak
Dodge Dakota
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10/28/2004
10:09:42
| RE: Wierd one.
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Kevin,
got me stumped on the garage vs. outside thing... I'm thinking it may just be a coincidence because when the engine is warmed up it shouldn't make a difference.
The only variable would be outside air temperature, and this time of year it's cooler outside. Cold air is more dense and would alter the fuel/air mixture a bit... that's why cars tend to run better on cooler days
Anyways, the O2 sensor does make a big difference with performance though and that's probably what is causing the problems. One of the O2 sensors went out on my truck awhile ago and it killed performance. It lost accelaration and would sometimes stumble at highway speeds.
If you know which sensor is making the code, relpacing that would probably make it act "normal" again. They're not cheap ($75 +) at the parts store but it will seem like a new truck and is well worth it.
If you're replacing it yourself, they rust in there pretty good and are tough to get out... If you use a bit of "anti seize" on the threads that will help make it easier if you ever have to take it out again.
1997 Extended Cab
318v8 4x4
Dual Flowmaster Exhaust
K&N Filter
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kevin
Dodge Dakota
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10/28/2004
12:03:15
| RE: Wierd one.
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Thanks for the input.
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