Intermittent 0303 and 0171 code - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-27-2012, 08:52 AM   #11
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he said he swapped wires, but going back through dont see where you swapped coils?
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Old 03-27-2012, 08:59 AM   #12
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Originally Posted by jwfirebird View Post
he said he swapped wires, but going back through dont see where you swapped coils?
Shame on me for not noticing.
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Old 04-01-2012, 08:33 PM   #13
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Swapped the coils also. Same problem. Cleaned the ICM. Same problem. New plug in #3.

Part that is difficult for me to understand is does not set a code when it doesn't start.
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Old 04-01-2012, 08:43 PM   #14
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Diagnostics won't start until the PCM sees the engine running for X seconds/minutes before it starts testing.
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Old 04-02-2012, 07:19 AM   #15
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check fuel pressure, swap injectors?
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Old 04-04-2012, 04:04 AM   #16
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I have the exact same problem on my 2000 Bonneville po171 and po306 sometimes po171 and other times just two po306 codes so I'm watching this thread for answers....
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Old 04-06-2012, 11:12 PM   #17
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I put some heet in my tank and seems to have done the job...
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Old 04-25-2012, 03:05 AM   #18
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Check the iac sensor ....
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Old 04-26-2012, 11:39 PM   #19
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Guys,

I found it. It was the fuel pump. I put in a new Delphi and a strainer about 1.5 weeks ago and everything seems is running fine.

I thought I had enough fuel pressure because I was getting soaked when I checked manually. When I put a loaner gauge on from Autozone on it I only had 35 lbs. Specs say 48-55lbs.

Along the way I have cleaned the ICM, IAC, throttle body, EGR valve, TPS. I have replaced MAF, O2 sensor, EGR valve gasket, throttle body mounting gasket and #3 injector. I checked for vacuum leaks.

Shows me that you always need the right tool for the job!!!

Many thanks to all for the help,

John
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Old 04-27-2012, 04:13 PM   #20
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I think you owe Justin a prop. He nailed this one.
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