Name that code
Name that code
Posting Guru
Joined: Nov 2002
Posts: 1,260
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From: Napa
These are the codes I'm aware of for exhaust related CELs for 92-96 
s
s- PO401: Insufficient EGR Flow
- PO402: Exhaust Gas Recirculation (EGR) Excessive Flow Detected
- PO410: Secondary Air Injection System Malfunction
- PO420: Catalyst System Efficiency Below Threshold (Bank 1)
- PO421: Warm-Up Catalyst Efficiency Below Threshold (Bank 1)
- PO430: Catalyst System Efficiency Below Threshold (Bank 2)
- PO431: Warm-Up Catalyst Efficiency Below Threshold (Bank 2)
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New User
Joined: Aug 2015
Posts: 20
Likes: 2
Ok thanks ZombieSlayer.
I'm trying to diagnose a 173 CM code.
Had a fellow tell me that the Cat was probably hollowed/burned out.
The thing has a Cat and a muffler and is still louder than my 351 running a Cat only.
I've replaced MAP, ACT, and o2.
ECT checked good.
Disconnected battery overnight to clear all adaptive strategies.
Same result.
There are no KOEO codes.
The 173CM will set every time when the engine comes up to operating temp.
I'm trying to diagnose a 173 CM code.
Had a fellow tell me that the Cat was probably hollowed/burned out.
The thing has a Cat and a muffler and is still louder than my 351 running a Cat only.
I've replaced MAP, ACT, and o2.
ECT checked good.
Disconnected battery overnight to clear all adaptive strategies.
Same result.
There are no KOEO codes.
The 173CM will set every time when the engine comes up to operating temp.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
These are the codes I'm aware of for exhaust related CELs for 92-96 s
[*] PO401: Insufficient EGR Flow[*] PO402: Exhaust Gas Recirculation (EGR) Excessive Flow Detected[*] PO410: Secondary Air Injection System Malfunction[*] PO420: Catalyst System Efficiency Below Threshold (Bank 1)[*] PO421: Warm-Up Catalyst Efficiency Below Threshold (Bank 1)[*] PO430: Catalyst System Efficiency Below Threshold (Bank 2)[*] PO431: Warm-Up Catalyst Efficiency Below Threshold (Bank 2)
s[*] PO401: Insufficient EGR Flow[*] PO402: Exhaust Gas Recirculation (EGR) Excessive Flow Detected[*] PO410: Secondary Air Injection System Malfunction[*] PO420: Catalyst System Efficiency Below Threshold (Bank 1)[*] PO421: Warm-Up Catalyst Efficiency Below Threshold (Bank 1)[*] PO430: Catalyst System Efficiency Below Threshold (Bank 2)[*] PO431: Warm-Up Catalyst Efficiency Below Threshold (Bank 2)
The codes you listed are for OBD-II vehicles. The OP's truck is OBD-I.
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New User
Joined: Aug 2015
Posts: 20
Likes: 2
Have not checked fuel pressure. (no tool for it)
Did check for fuel in FPR vacuum line. (none present)
o2 sensor is new. (Bosh from Autozone)
Edit = I have obtained a copy of the Pinpoint test. Will proceed down the list today.
Did check for fuel in FPR vacuum line. (none present)
o2 sensor is new. (Bosh from Autozone)
Edit = I have obtained a copy of the Pinpoint test. Will proceed down the list today.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
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New User
Joined: Aug 2015
Posts: 20
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Following the steps in the Pinpoint test ....
ASSUMING the fuel pressure steps all passed ...
The next rungs of the ladder have all been done and passed.
The truck is indeed running rich.
Smell and/or black smoke verifies.
Seems logical to me that it indeed has to do with fuel pressure and/or injectors.
Thought maybe I'd run some injector cleaner thru it just to see what, if anything, happens. But to be honest I'm about sick of screwing with it. I have a mechanic that I trust. Was just hoping to save some $ and gain some knowledge in the process.
Thanks for all offered assistance! :-)
ASSUMING the fuel pressure steps all passed ...
The next rungs of the ladder have all been done and passed.
The truck is indeed running rich.
Smell and/or black smoke verifies.
Seems logical to me that it indeed has to do with fuel pressure and/or injectors.
Thought maybe I'd run some injector cleaner thru it just to see what, if anything, happens. But to be honest I'm about sick of screwing with it. I have a mechanic that I trust. Was just hoping to save some $ and gain some knowledge in the process.
Thanks for all offered assistance! :-)
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