CEL 2 months after tune
 

Had an uptune and hfcs done about 2 months ago and suddenly I'm getting a cel. When I hooked up my code reader, it told me that bank two is running lean running lean. At the same time the idle goes up to about 1k rpm ( normally set at +/- 750) . After I reset the ecu it runs fine for a while, then in stop and go traffic it pops up again. Anyone else with the same situation? I read that some of you had issuses with the berks after a month so.Could it be the o2 sensor in the hfc's or a bad sensor elsewhere ? I want an idea where to go first, the tuner or the dealership.
Thanks.

You had the car tuned by a shop?

yes I did.

The only thing I can think of is they damaged an 02 Sensor or it was not tuned correctly. But I'm thinking bad O2. Get under the car and see if the wires are messed up.

Most likely at exhaust leak. Check your HFC to be sure it's not cracked.

:iagree: Seems I here this same issue everytime I'm at a shop

Eliminate the two rear O2 sensor inputs to the ecu. The UpRev tuner should have done this. It will eliminate any rear O2 issues.

True that. That's post to be a given.

Maybe it's just a ghost in the machine. Leaving Delaware bound for central Jersey I had to reset the cel again. Drove 200 miles and no cel! I was even crawling up US 1 north in certain towns and no cel. Even let the car idle for about 10 minutes while I ran into a resturant to grab a take out meal.Could it have been a bad tank of gas cause after I filled up down there, the problem seems to have gone away?

Who you going to call?

It's baaack! Who am I going to call? The tuner. Seems like the o2 sesor is acting up, got both banks "running lean". Well since I'm getting an LSD ( a Carbonetics 1.5 ) installed on Monday, I'll have to wait untill then and just ride around with my code reader and reset as needed. Is this the same code some of you have been getting?

LSD. In for results. I haven't heard of anyone with a Carbonetics on a 370.

What kind of scanner do you have and what codes are you getting? Just because someone has the software to uprev a car doesnt mean they know how to! The rear 02's are there for a reason and no shop should cut them off completely if they know what they are doing. If they do then they are just selling you short of what a good reputable shop can give you. Think about this, if an exhaust J bend can fool a computer then why are you paying someone to tune the same thing? I would hope they would know how to tune it more efficiently.

I got a P2A00 and P2A03 after installing ART pipes. What are your CEL codes? Taking mine to Corner 3 garage Thursday.. Hopefully they can fix.

I'm using Cipher to access the codes and reset.Btw it's awesome to watch all your engine parameters and log whats' going on.
If I remember correctly I'm getting 0179, " bank one and two running lean"
The tuner is reputable and we already spoke about the problem, the rear O2 sensors will not be eliminated.
Anyway she goes in on Monday for both the cel problem and the lsd.
I'll keep you all updated on the rearend.