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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #1  
Old 01-10-2011, 11:00 PM
brusk brusk is offline
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Default slow 02 read error codes on 07 5.7 after mods

Just did intake/Headers (no cats, rear O2's hung and bungs plugged) catback and predator tuner. First time was on the highway and it was in 4 cyl mode there was a lack of power and a slight hesitation coming back into 8 cyl mode the CEL/SES came on complaining about slow response from O2's 1/1 and 2/1. I reset and fixed a few exhaust leaks but it still did it again. I turned off MDS with the programmer and ran it for another day and today it did it again just lightly crusing about 60-65 in traffic on the highway. Truck has 80K miles on it, any thoughts.
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Old 01-11-2011, 11:16 AM
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Since you just did some major mods, I'd suggest you keep looking for and eliminating any exhaust leaks upstream of the 1/1 and 2/1 sensors. The only other causes would be the wiring to the sensors or the sensors themselves.
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Old 01-11-2011, 12:58 PM
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Long tube headers so no place for any leaks above the primary O2's. The only thing that I had to do that I didn't was swap the secondary and primary on the passenger side as the wiring was just a little short.
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Old 01-11-2011, 12:59 PM
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I guess once I get it tuned and figure out the frequency of it I could revert back to the factory tune and see if it still does it then if nobody else has any thoughts.
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Old 01-11-2011, 01:01 PM
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Quote:
Originally Posted by brusk View Post
Long tube headers so no place for any leaks above the primary O2's. The only thing that I had to do that I didn't was swap the secondary and primary on the passenger side as the wiring was just a little short.
You're positive there are no leaks at the manifold to header gasket? And what do you mean by swapping the secondary and primary?
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Old 01-12-2011, 11:15 PM
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I don't feel or hear any leaks at the head. The O2 sensor 2/1 didn't quite reach the plug and 2/2 had longer wiring on it and the connectors were the same I swapped those two and hung the rears until I can research simulators or o2 defoulers since I didn't have extra money for cats at this point.
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Old 01-14-2011, 07:03 PM
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wait did you put the sensors inside the headers. Casper makes 02 extenders i used for my headers no problems so far
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Old 01-15-2011, 12:12 PM
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The primarys are in the headers the secondary's are plugged in and tied up out of the way not in the exhaust. But the codes being set are for the primary's. I Drove 700 miles yesterday and it didn't come back on until I end up on a back road almost home behind a slow car and it was taching under 1500. 65-85 on the highway the entire time had no issues. And I've triple checked that there are no leaks before the primary O2's. I'll look into that o2 entender and switch the 2 sensors how they really should be but in the end usually an o2 is an o2.
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