5.8L Code 172
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New User
Joined: May 2003
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5.8L Code 172
I've searched the forums for potential fixes for this issue, although I'm not sure where to begin....
Although it seems to run fine, I get a check engine light after it has been running at 2000 rpms or so for an extended time...30 to 40 minutes.
Both the EGR valve and O2 sensor have been changed within the last 10000 miles.
From what I'm reading, I may have vacuum or fuel delivery problem. Any suggestions as to where to begin?
Although it seems to run fine, I get a check engine light after it has been running at 2000 rpms or so for an extended time...30 to 40 minutes.
Both the EGR valve and O2 sensor have been changed within the last 10000 miles.
From what I'm reading, I may have vacuum or fuel delivery problem. Any suggestions as to where to begin?
Cargo Master
Joined: Oct 2004
Posts: 2,148
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From: Seneca, SC
Vacuum can be checked with soapy water. Get a spray bottle and shoot around the vacuum lines. You could also have a chance to listen for any hissing. Hissing can be other things, but sometimes it's vacuum. Also of course check for loose lines.
Elder User
Joined: May 2007
Posts: 754
Likes: 1
From: Solon, Ohio
I had the exact same symtoms on a truck I had recently purchased and found out the previous owner had either cut the 02 sensor wires or had swapped in a junkyard manifold pipe and forgot to install a new sensor, or forgot to splice the wires back together.
I spliced the wires and was good to go.
It is a heated 02 sensor and when they are bad, they don't throw the code till your running down the road a bit.
Check your 02 sensor wiring and connector connection.
There is also a good posibility that the new sensor went bad.
If it was a fuel delivery or vacuum problem, I would expect it to throw the code sooner.
I spliced the wires and was good to go.
It is a heated 02 sensor and when they are bad, they don't throw the code till your running down the road a bit.
Check your 02 sensor wiring and connector connection.
There is also a good posibility that the new sensor went bad.
If it was a fuel delivery or vacuum problem, I would expect it to throw the code sooner.
Last edited by netscaner; Jun 23, 2007 at 11:52 PM.
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