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| Username | Post: Bank 1 reading lean | |
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Tritip "2nd Year" Silver Supporting Member Posts 44 
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05-04-12 05:47 PM - Post#2222508
What would fix this? It happens every now and again. Twice both 1 and 2 read lean. Is there anything I can do to fix this. Other then clearing the codes when they pop. 1996 350 5.7L 80MM throttle body, aftermarket mass Air flow, K&N full intake, MSD Coil, and short Headers. I replaced the O2's about 30,000 miles ago maybe less.
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someotherguy Moderator Posts 23555 
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05-04-12 06:05 PM - Post#2222515
Checked fuel pressure lately? Still running the original poppet valve setup and how many miles are on that? Richard
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ltlvt Senior Member Posts 1583 |
05-04-12 06:27 PM - Post#2222524
As small exhaust leak will bleed O2 into the system causing the ECM to think it is lean.
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Tritip "2nd Year" Silver Supporting Member Posts 44
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05-05-12 08:15 AM - Post#2222678
I have not checked the pressure as of late (if I remember correct, should be 52psi?). The original Poppets are still on there, rolling with 111340 mile as of yesterdays drive home. **I don't think there is an exhaust leak (I will double check)**
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someotherguy Moderator Posts 23555
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05-05-12 03:39 PM - Post#2222852
Fuel pressure info in the FAQ but short and sweet, factory spec is 58~62 psi on the Vortec small block. Richard
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