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tahoe,2004


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chickenhouse
Enthusiast

Aug 6, 2011, 3:26 PM

Post #1 of 6 (3285 views)
tahoe,2004 Sign In

5.3 Z71 codes are lean on bank 1 and bank 2. Codes are 171 & 174. Runs along fine, losses power and quits. Wait 10 or 15 mins, starts and runs fine again.


chickenhouse
Enthusiast

Aug 6, 2011, 3:55 PM

Post #2 of 6 (3280 views)
Re: tahoe,2004 Sign In

Fuel pressure runs at 46 to 48 psi at idle.


Discretesignals
Ultimate Carjunky / Moderator
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Aug 6, 2011, 4:19 PM

Post #3 of 6 (3277 views)
Re: tahoe,2004 Sign In

What is fuel pressure when it stalls?





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Hammer Time
Ultimate Carjunky / Moderator
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Aug 6, 2011, 4:35 PM

Post #4 of 6 (3269 views)
Re: tahoe,2004 Sign In

That fuel pressure is too low CH.
If it's a "T" motor, it should be 55-62
If it's a Vin "Z", it should be 48 - 54 with no margin for error



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



chickenhouse
Enthusiast

Aug 6, 2011, 4:58 PM

Post #5 of 6 (3265 views)
Re: tahoe,2004 Sign In

Pretty much what we were thinking when pressure test came back low. I thought 50 -55 would have been good. Thanks guys!


Hammer Time
Ultimate Carjunky / Moderator
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Aug 6, 2011, 5:03 PM

Post #6 of 6 (3263 views)
Re: tahoe,2004 Sign In

Even that would be too low if it is a "T" motor.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







 
 
 






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