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I have a 01 jeep TJ that I have swapped a 5.3 from a 03 Silverado into. I recently had a local exhaust shop build exhaust from the manifolds back. they did a horrible job and now there are several...

Oh one more question. I went ahead and purchased an AFR gauge with a wide band sensor. I am wondering how far back on the exhaust I can mount before it is rendered inaccurate. The reason I ask is...

DGS thank you for your response, I'll do a test drive and post some data.

As for the 18+ MPG, this info came from a conversation I had with the Guys from Novak Adapters where I purchased my trans...

I did an LM7 swap which is a 5.3 vortec from a 2003 Silverado into a jeep TJ.

I purchased an Tach Emulator from Novak Adapters which allowed me to connect my tach signal from my P59 ECU to my...

Revising this Thread,

I finally had time after the holidays to work on my Jeep with the 5.3 swap. I replaced the fuel pump and now I am getting between 49 and 60 PSI at the fuel rail, 49 at idle...

Though 2xLS1 has given me some good info I am still wondering if there is a programming logic flow chart for the P59. I truly believe that this would be the best way for me to learn.

Thank you for the response. A lot to take in. Do you know at what rpm the ecm switches to MAF only? And is this RPM adjustable?

Hi all, new to HP Tuners and new to tuning ECMs. I purchased my HP Tuner to work on my personal car which is an 01 Wrangler with an 03 vortec 5.3 swapped in.

There is much more to this tuning ECM...

now that I think about it I could be pushing air to the fuel rail starving the injectors for fuel? I wonder if I would still maintain fuel pressure while pushing air?

Funny you should ask, so I replaced the stock fuel pump with a Walbro 255. for some reason when my fuel tank gets to a little less than half full I start getting a little sluggish, almost bordering...

Hello all, I'm new here and I'm new to HP tuners.

I have an 01 Jeep tj that I swapped a 5.3 from an 03 Silverado into along with the 4l60e. I had the harness manicured and ECM programmed by a guy...