Code PO171 and Po174 with a no start

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Code PO171 and Po174 with a no start

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Blazer Forum >> Mechanical & Maintenance >> Engine & Transmission >> Code PO171 and Po174 with a no start

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Code PO171 and Po174 with a no start - 9/30/2008 6:18:26 AM

Jetfixer

Posts: 13
Joined: 12/14/2005
Status: offline

Gentlemen,
As I was driving home yesterday I got a check engine light. I went out to check it the next day and I had a PO171 and a PO174 code. I then tried to start it and it would not start. I sprayed some carb cleaner in the TB and it started. I drove it the rest of the day and this morning the same thing. I haven''t checked the fuel pressure yet and I did notice I had a flashing security light with the key in the run position with the engine off. I cleared the codes that morning and they returned soon after. Any ideas?

_____________________________

2000 blazer lt

Post #: 1

RE: Code PO171 and Po174 with a no start - 9/30/2008 6:26:25 AM

swartlkk

Posts: 14472
Joined: 5/1/2005
From: Waterloo, NY
Status: offline

Check out the DIY section for the explanation of the P0171 code. P0174 is the same code for Bank 2 (passenger side).

Since you are getting both of these codes at the same time, I would say that you are having fuel supply problems. Either inadequate fuel pressure or a restriction (clogged filter?) in the supply line.

< Message edited by swartlkk -- 9/30/2008 6:27:15 AM >

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Kyle-

2004 Rainier
1970 Chevelle - Resto
1974 K5 Blazer - Resto

(in reply to Jetfixer)

Post #: 2

RE: Code PO171 and Po174 with a no start - 9/30/2008 6:20:00 PM

Jetfixer

Posts: 13
Joined: 12/14/2005
Status: offline

I checked the fuel pressure and it is 50psi running and 55 psi with the key on. I also noticed that the car bogged down after frequent revving but once i squirted carb cleaner in the inlet it cleared up.

_____________________________

2000 blazer lt

(in reply to swartlkk)

Post #: 3

RE: Code PO171 and Po174 with a no start - 10/1/2008 4:13:51 AM

swartlkk

Posts: 14472
Joined: 5/1/2005
From: Waterloo, NY
Status: offline

I would change out the fuel filter if you have not yet. Have you monitored the fuel pressure while driving? It sounds like you are having fuel delivery problems under higher fuel consumption conditions.

_____________________________

Kyle-

2004 Rainier
1970 Chevelle - Resto
1974 K5 Blazer - Resto

(in reply to Jetfixer)

Post #: 4