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2005 Expy P0174 and P0301 Error Code Help

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Old Apr 16, 2012 | 02:24 PM
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2005 Expy P0174 and P0301 Error Code Help

I just got a AutoXray 700 CodeScout and pulled two codes.

P0174 - System Too Lean (Bank 2)
P0301 - Cylinder 1 Misfire Detected

Can I get some advise on how to fix the above codes?

My plugs were changed about a year ago, so I'm thinking the misfire is a bad cop. Not sure about the lean condition.

Any ideas?
 
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Old Apr 16, 2012 | 02:31 PM
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well the lean could be cause by the coil pack not burnning the fuel correctly but it can also be a bad o2sensor check under the truck it could have gotten unpluged mine was.
 
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Old Apr 16, 2012 | 03:12 PM
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Originally Posted by 5.4T
well the lean could be cause by the coil pack not burnning the fuel correctly but it can also be a bad o2sensor check under the truck it could have gotten unpluged mine was.
I was planning on replacing the COP, so I guess we'll see what happens to the lean condition after that.

Can you tell me where the O2 sensor is? Wouldn't that come up as being bad on the scanner?
 
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Old Apr 17, 2012 | 12:25 PM
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Bank 2 is the driver's side. There are 2 O2 sensors, one before and one after the catalytic converter. The one before is the one you want to get at.
 
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Old Apr 17, 2012 | 02:30 PM
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Originally Posted by alloro
Bank 2 is the driver's side. There are 2 O2 sensors, one before and one after the catalytic converter. The one before is the one you want to get at.
Thanks, I will check that.

I picked up another code today on my way to work. It is:

P0308 - Cylinder 8 Misfire Detected

Also, can someone confirm the cylinder order below is correct?

Radiator
5 1
6 2
7 3
8 4
Firewall

Thanks.
 
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Old Apr 17, 2012 | 11:24 PM
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Originally Posted by 026TB4U
Also, can someone confirm the cylinder order below is correct?

Radiator
5 1
6 2
7 3
8 4
Firewall
Confirmed, you have it correct. I trust you took notice that #8 is on bank 2!
 
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Old Apr 18, 2012 | 09:02 AM
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Originally Posted by alloro
Confirmed, you have it correct. I trust you took notice that #8 is on bank 2!
Thanks for the confirmation. I cleared the codes and the cylinder #1 and #8 codes came back. I have not seen the lean condition again, but I am going to check the O2 and change the fuel filter.

How hard is it to replace COP #8? It's way back but it looks unobstructed.
 
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Old Apr 19, 2012 | 01:09 AM
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Originally Posted by 026TB4U
How hard is it to replace COP #8?
A little time and a little patience and it's not so bad. I know you changed them only a year ago but you might want to change the spark plug while you have the COP out, just in case it's a bum spark plug.
 
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Old Apr 19, 2012 | 03:09 PM
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Originally Posted by alloro
A little time and a little patience and it's not so bad. I know you changed them only a year ago but you might want to change the spark plug while you have the COP out, just in case it's a bum spark plug.
I replaced Cop #8 last night. A majority of the misfiring is gone. I am still getting some low rpm misfiring but no codes have been returned. I may try replacing #1 since that was the only other misfiring code I received.

The dealer replaced the plugs, so if the COPS don't fix the problem, it is going back to them.
 
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Old Apr 20, 2012 | 07:38 AM
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Problem solved!!!

I replaced my #1 COP last night. Low RPM misfires are gone and power is smooth all the way up to redline.

Thanks for all the help.
 
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