I rebuilt a 03 1500 5.7 put pacesetter full length headers on it with taps for pre cat sensor. I am still running full rich so it wont idle even after heating up the engine? Any advice would much appretiated!

 

O2's don't have much sway on mixture at idle...... I think you have something else going on there.

 

agreed...

Q: how do you know you're rich? do you have a wideband on it or monitoring software?

Q: did you contaminate the sensor? for instance, coolant has a really bad affect on those things..

Q: do you have an exhaust leak north of the sensor significant enough to cause the sensor a bad reading? you should be able to hear a leak that bad..

 

I also agree, you have some other problem other than the o2 sensors

 

Thanks guys you are correct, I have a intake leak. Do you know where I might find one somewhere other than a dealership,they think they are made of gold instead of plastic!319.34 in Terrell Texas( 03 5.7hemi) salvage yards anywhere within desent driving distance no help or ebay?

 

I have two widebands on it. The scanner showed the code 02 voltage high. I have found the problem on the no idle, it was a vacum leak at the intake. I have headers and dual exaust whitout a cross over pipe. Do you know if I need a pre and post 02's spliced into the harness to lower the high voltage reading I'm getting on the scanner?

 

You were right thanks,I have an intake leak. Can you tell me what the small butterfly shaped gaskets are called so I can look them up where the oil inlet is (between 1 and 3 ports and between 6 and 8 ports of the intake? I have looked at all the local parts stores here and they all show the gasket sets with only the 8 port gaskets??