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Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 15726
Experience:  15 years GM master tech
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I am getting code po174 and code 171 : 4.3 : my chevy blazer

Customer Question

i am getting code po174 and code 171
JA: Do you happen to have a code reader or scan tool? What size is your engine?
Customer: 4.3
JA: Tell me a bit more about what's going on so he can help you best.
Customer: my chevy blazer lack power at low speed sometimes , check engine light came on with code po171 and po174
JA: Are you hoping to fix this yourself?
Customer: yes
JA: Great! What have you tried so far?
Customer: check for vacuum leaks, replace fuel filters, checker air filters and checked maf
JA: Is there anything else the Chevy Mechanic should be aware of about your Chevy?
Customer: truck run smooth
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Chevy Mechanic about your situation and then connect you two.
Submitted: 6 months ago.
Category: Chevy
Expert:  Gary replied 6 months ago.

when you clear the codes how soon before they reset ?

any idea what the fuel pressure is key ON engine OFF and will it some what hold on the fuel pressure gauge or drop to 0 within a few seconds ?

Customer: replied 6 months ago.
no
Expert:  Gary replied 6 months ago.

those codes are both lean codes and either there is a vacuum leak or a bad MAF or most common you are going to find a low pressure or pressure dropping off to 0 very quick causing these problems

99 % of these with new fuel filters and no vacuum leaks are bad fuel pumps

if you have any questions please ask as i do not get credit for my work until you rate me here at Justanswer

Expert:  Gary replied 6 months ago.

if you have any questions please ask as i do not get credit for my work until you rate me here at Justanswer