I'd have your intake smoked to find the vaccum leak. Due to the age, I'd replace all the rubber hoses regardless. Check your fuel pressure also, could be not enough fuel, inflating the air measurements. Another possible area to check is your exhaust manifold to the cat, a leak in this area would also pull those codes.
So I’m limited on tools and don’t have a smoke machine...what’s the next best method to find a vacuum leak, also I’ve replaced fuel pump and filter...
I’ve installed new MAF sensor and replaced PCV valve...shortFT% is between 15-35 and longFT% is steady @ 25...
2000 Chevrolet Blazer LS 2-Door 4WD
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Maintenance & Repair
My 07 avalanche is pulling p0171 and p0174 codes saying the engine is running too lean. I replaced the intake manifold and they still show. I have a cold air intake on it (not sure if it has to do...
2007 Chevrolet Avalanche 2LT RWD
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Maintenance & Repair
My engine light came on yesterday so I bought a Innova obd2 reader and got the following codes: P0174, P0171, P0650, & C0281 After reading the codes I performed a MAF sensor cleaning with the MAF S...
2004 Chevrolet Silverado 1500 RWD
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Maintenance & Repair
stalls at first start then runs good
2000 Chevrolet Blazer LT 4-Door 4WD
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General
have a 2002 Toyota Camry. I am getting obd2 error codes P0171 and P0174. I have replaced the spark plugs, mass airflow sensor, pcv valve, ignition coil packs, and cracked oil filler cap. I am going...
2002 Toyota Camry XLE V6
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Maintenance & Repair
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