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Username Post: Bank 1 reading lean        (Topic#280655)
Tritip 
"2nd Year" Silver Supporting Member
 Posts: 44
Tritip
Age: 35
Loc: Cali
Reg: 05-21-09
 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.
96 Chevy 1500 5.7l


 

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someotherguy 
Moderator
 Posts: 23385
someotherguy
Age: 43
Loc: Texas
Reg: 08-01-03
 05-04-12 06:05 PM - Post#2222515    
    In response to Tritip

Checked fuel pressure lately? Still running the original poppet valve setup and how many miles are on that?

Richard
94 GMC C1500 SLE / 06 300C SRT8
Check out my truck shop projects


 

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ltlvt 
Senior Member
 Posts: 1576

Age: 61
Loc: Wichita Falls Texas USA
Reg: 09-17-00
 05-04-12 06:27 PM - Post#2222524    
    In response to someotherguy

As small exhaust leak will bleed O2 into the system causing the ECM to think it is lean.
Runs like a Scalded Dog!!


 

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Tritip 
"2nd Year" Silver Supporting Member
 Posts: 44
Tritip
Age: 35
Loc: Cali
Reg: 05-21-09
 05-05-12 08:15 AM - Post#2222678    
    In response to someotherguy

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)**

96 Chevy 1500 5.7l


 

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someotherguy 
Moderator
 Posts: 23385
someotherguy
Age: 43
Loc: Texas
Reg: 08-01-03
 05-05-12 03:39 PM - Post#2222852    
    In response to Tritip

Fuel pressure info in the FAQ but short and sweet, factory spec is 58~62 psi on the Vortec small block.

Richard
94 GMC C1500 SLE / 06 300C SRT8
Check out my truck shop projects


 

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