headers and check engine light

[hchf1234]

just installed catless headers now i have a code for p0171 and p0174 is this normal? i am tuned by majed on base map

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[LOL WUT]

just installed catless headers now i have a code for p0171 and p0174 is this normal? i am tuned by majed on base map

Normal, you have no cats…. Get some 02 spacers (search the forum for big daddy spacers).

 

[dcalero]

That is normal, the o2 sensors readings are out of range since you removed your catalytic converter. I don't think a tune will fix it but i'm not 100% sure. You can add a defouler to each header which will make the o2 sensor be further away from the pipe.

 

[hchf1234]

That is normal, the o2 sensors readings are out of range since you removed your catalytic converter. I don't think a tune will fix it but i'm not 100% sure. You can add a defouler to each header which will make the o2 sensor be further away from the pipe.

my tuner said he wants data logs i’m assuming because my afr were reading low and spikes randomly and drops i did the data logs and seems to be around 14 now

 

[Zelek]

Tuners don't turn off rear O2's anymore due to EPA coming after them if they do. You need spacers even with catted long tube headers.

 

[hchf1234]

Tuners don't turn off rear O2's anymore due to EPA coming after them if they do.

the code was for running lean guessing it’s tune related

 

[Zelek]

the code was for running lean guessing it’s tune related

Correct, you'd be getting P0420 if it was the O2's. Once you do some highway driving at a consistent speed, that's usually when you'll get that code.

 

[hchf1234]

Correct, you'd be getting P0420 if it was the O2's. Once you do some highway driving at a consistent speed, that's usually when you'll get that code.

i did some data logs last night hopefully that fixes it so it’s 100% tune related?

 

[Zelek]

i did some data logs last night hopefully that fixes it so it’s 100% tune related?

Sounds like it is. Are you running E85 or is it just straight 91/93?

 

[hchf1234]

Sounds like it is. Are you running E85 or is it just straight 91/93?

straight 93

 

[Zelek]

straight 93

You need to send a data log to your tuner.

 

[hchf1234]

You need to send a data log to your tuner.

i already did acouple idle for 5 min and a couple 2-7k rpm pulls and the light hasn’t come back on but i haven’t drove it a lot yet just trying to see if it comes back on then what could be the issue

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