2003 suburban running rough.. need help!!
12-13-2017, 09:01 PM
#1
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2003 suburban running rough.. need help!!
so I got the gaskets replaced because it was leaking oil from the rear main seal then I had bad problems once the weather got cold.. It started to run really rough and when I went to get it checked at o really they told me it was most likely just needs a tune up so I bought new wires and plugs.. Then it was still running rough and they told me it was too lean.. Later I found the pcv valve to be out of its place and that kinda helped but then it started getting worse and stopped driving it.. I assumed the misfires were the ingnition coils so I replaced them but the problem is still there.. I bought a obd scanner to check it myself and got a P3401 and a C3103.. Couldn't find what they exactly mean so I need help to get it running before school starts again next semester.. It'* my daily.. So far I've changed spark plugs, cables, ignition coils, oxygen sensors, and fixed all gaskets.. I'm thinking of checking the injectors but idk what to go on anymore
12-14-2017, 12:15 AM
#2
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True Car Nut
"All gaskets" would involve complete engine disassembly, so I am guessing that maybe a lot of gaskets were replaced but not all. That having been said, have you replaced the upper intake manifold gaskets? This is common for this engine when the weather gets cold while the UIM gaskets are old.
Also:
Odometer reading?
Engine is a 5.3, right?
What part of the world does it live in?
How long have you owned it?
Also:
Odometer reading?
Engine is a 5.3, right?
What part of the world does it live in?
How long have you owned it?
Last edited by CathedralCub; 12-14-2017 at 12:18 AM. Reason: Added questions
12-19-2017, 11:41 PM
#4
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Just a wild guess here, but....
I think the P3401 is causing the following codes:
P0171
P0174
P0300
P0101 is an isolated code (bad or dirty) MAF, possibly bad wire.
P0154 is an isolated code (a bad sensor) or bad o2 wires.
P3401 is related to cylinder deactivation code. One (or up to as many as four) of the cylinders are not firing. The ECM has deactivated four of the fuel injectors and one or more of them have not reactivated when they were supposed to. Those cylinders are not getting fuel, thus the P0300 random misfire code. Those deactvated cylinders are still pumping air, but with no fuel to ignite, both fuel banks are resulting in a lean condition and displaying the P0171 and P0174 codes.
Just a shot in the dark.....my wild guess is that something associated with the deactivation solenoids are the source of the problem.
This may be a case where it might be best to pay the $$$ for a professional diagnosis if you need the truck back on the road ASAP.
I think the P3401 is causing the following codes:
P0171
P0174
P0300
P0101 is an isolated code (bad or dirty) MAF, possibly bad wire.
P0154 is an isolated code (a bad sensor) or bad o2 wires.
P3401 is related to cylinder deactivation code. One (or up to as many as four) of the cylinders are not firing. The ECM has deactivated four of the fuel injectors and one or more of them have not reactivated when they were supposed to. Those cylinders are not getting fuel, thus the P0300 random misfire code. Those deactvated cylinders are still pumping air, but with no fuel to ignite, both fuel banks are resulting in a lean condition and displaying the P0171 and P0174 codes.
Just a shot in the dark.....my wild guess is that something associated with the deactivation solenoids are the source of the problem.
This may be a case where it might be best to pay the $$$ for a professional diagnosis if you need the truck back on the road ASAP.
12-20-2017, 03:19 PM
#5
Senior Member
True Car Nut
Good theory, however, cylinder deactivation didn't come along until a couple of years after this Suburban'* model year. I suspect that P3401 is erroneous or GM used P3401 for something else prior to 2005 model year. Or Silvsreyes96 has swapped in a 2005-present 5300 and PCM and not mentioned it.
Silvsreyes96, can you answer these questions for us?
Silvsreyes96, can you answer these questions for us?
03-05-2021, 01:58 AM
#6
Senior Member
True Car Nut
While it may telling you that there is a misfire on cylinder 3, that code could be a misread code. My 93 Buick LeSabre; may it rest in peace, threw a code that was completely wrong. Had me chasing the wrong rabbit for quite a bit. I also had a misfire once with a set of wires that were only two years old; be sure to get quality wires because cheap wires are just that, cheap.
Here is something I learned from my Dad, look under the bonnet when it is dark; strange sparkies that you can't see in the daylight will show up. I found the misfire with the 93 LeSabre, I could see the current flowing along the jacket of number 1 wire; between the outer and inner jacket of the wire; strange.
Here is something I learned from my Dad, look under the bonnet when it is dark; strange sparkies that you can't see in the daylight will show up. I found the misfire with the 93 LeSabre, I could see the current flowing along the jacket of number 1 wire; between the outer and inner jacket of the wire; strange.
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