Another p0171 and p0174 thread

[Alpha-Lykos]

2003 suburban
200k miles

On cold start I'm I getting p0171 and p0174 and if I let it idle for too long on cold start a p0300 code with flashing CEL.


I AT seems to be functional and is reading at five to ten degrees above ambient temperature.

Long term fuel trim rests at 25 off throttle and 13 to 15 on throttle.

I know I have an air leak.
How would you go about finding it?

I did the old school spray starting fluid everywhere and listened for change in idle to no avail.

 

[shreksbrother]

Did you spray it where the intake manifold goes into the heads? Mine leaked there (i think it is a common failure point).


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[Alpha-Lykos]

Did you spray it where the intake manifold goes into the heads? Mine leaked there (i think it is a common failure point).


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Yup no joy