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03DaKota
Dodge Dakota
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12/24/2003
14:18:01
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 Subject: Cat back exhaust...HELP
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Message:
I just put on a gibson cat back exhaust system on my 4.7L. Now I am having a problem when I rev up the motor at about 4000 RPM it starts to idle up and down a difference of 500 RPM or so and it wont rev any higher. Now I suspect that it is not getting enough back pressure anymore because the exhaust is opened up to a three inch exit. If that is the case will the comp re-learn the way it now operates? The other ? is this is custom exhaust from Gibson why would they build the exhaust and sell it if it caused the vehicle to not run properly? Did they build it to the wrong specs? If you have any knowledge or previous experience with this problem any help would be appreciated.
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Fred
Dodge Dakota
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12/24/2003
20:14:02
| RE: Cat back exhaust...HELP
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Message:
Did you try pulling the ecm fuses or disconnect the batt. for 5 min? You can try disconnecting both cables from the battery and touch the two together. that discharges the caps in the pcm then hook back up both batt cables to the battery, always the neg side last. then start it and drive it so it can relearn its idle stratagy. also if the after the cat o2 is not installed. install it. it will fail the cat monitor when the pcm runs the cat monitor test. and it will turn on the check engine lite,and also fail smog.
Fred
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