my car running to lean, please help.code, p0171/ p0174

03supercobra

Fire Red
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my cars check engine light came up and gave me two codes they are p0171 and p0174 system to lean. i cannot find the problem. i checke the vacuum lines, maf sensor, changed the spark plugs, and change the 2 upper o2 sensors and the codes still appears. i also noticed the blowers bolts were loose for some reason. i bolted it down and im still getting the same check engine codes. i was wondering if any of you know what the problem may be.
 

Rick James

Got Brimley???
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Hmm, I have been getting the P0174 since my Whipple install, but I am pretty sure it is a tuning issue. All vacuum checks out and the o2's have been cleaned/swapped to no avail. Pretty sure this only happens in closed loop, and that it is not a catastrophic issue, but mine will be getting datalogged here in the very near future. I would do the same and get with your tuner to discuss.
 
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03supercobra

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running lean

i just found the problem, its the blower gasket. were do i find the gasket for a kenne bell 2.8 h .
 
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svtcobrar2004

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sorry to high jack the thread but. my guage is showing the vacum idle at -10. but my check engine light isn't coming on and i dont feel any loss of power.
 

03supercobra

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Is the vacuum suppose to be at 18-20 even if the car has stafe 3 crower race cams, just asking if the cams may affect the vacuum.
 

JB

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Is the vacuum suppose to be at 18-20 even if the car has stafe 3 crower race cams, just asking if the cams may affect the vacuum.

I'm not familiar with Stage 3 specs but I assume they have more overlap than stock and that will lower vacuum

By how much, I don't know...
 
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03supercobra

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I finally figured it all out, i got the car running and fixed all the problems. Thanks for the help:burnout:
 

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