5.3 misfiring
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CF Beginner
Joined: Apr 2013
Posts: 3
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5.3 misfiring
I have a 2005 Suburban, it has a random misfire code, that comes and goes.
It had the 5.3 flex fuel motor. The motor checked out very good but was down on power. A couple different shops could not correct the problem.
It was missing on 1 and either 2 or 3.
Replaced all the injectors, plugs and the coils on the misfiring cylinders .
The next move I replaced the engine with one out of a pickup, none flexfuel. I transferred everything over with the replacement engine. Coils, Injectors and everything associated.
I then had another shop go over it again checking all the grounds.
It still has the misfiring.
I am down to replacing the computer.
Can anyone give me any suggestions on how to fix the problem?
It had the 5.3 flex fuel motor. The motor checked out very good but was down on power. A couple different shops could not correct the problem.
It was missing on 1 and either 2 or 3.
Replaced all the injectors, plugs and the coils on the misfiring cylinders .
The next move I replaced the engine with one out of a pickup, none flexfuel. I transferred everything over with the replacement engine. Coils, Injectors and everything associated.
I then had another shop go over it again checking all the grounds.
It still has the misfiring.
I am down to replacing the computer.
Can anyone give me any suggestions on how to fix the problem?
CF Monarch
Joined: Jul 2011
Posts: 5,920
Likes: 140
From: kevinkpk
I have a 2005 Suburban, it has a random misfire code, that comes and goes.
It had the 5.3 flex fuel motor. The motor checked out very good but was down on power. A couple different shops could not correct the problem.
It was missing on 1 and either 2 or 3.
Replaced all the injectors, plugs and the coils on the misfiring cylinders .
The next move I replaced the engine with one out of a pickup, none flexfuel. I transferred everything over with the replacement engine. Coils, Injectors and everything associated.
I then had another shop go over it again checking all the grounds.
It still has the misfiring.
I am down to replacing the computer.
Can anyone give me any suggestions on how to fix the problem?
It had the 5.3 flex fuel motor. The motor checked out very good but was down on power. A couple different shops could not correct the problem.
It was missing on 1 and either 2 or 3.
Replaced all the injectors, plugs and the coils on the misfiring cylinders .
The next move I replaced the engine with one out of a pickup, none flexfuel. I transferred everything over with the replacement engine. Coils, Injectors and everything associated.
I then had another shop go over it again checking all the grounds.
It still has the misfiring.
I am down to replacing the computer.
Can anyone give me any suggestions on how to fix the problem?
CF Beginner
Joined: Aug 2024
Posts: 2
Likes: 0
From: NJ
Duke silver
I had the same issue. I did everything he did but also changed out the wires , that he didn't mention. My issue went away. As far as loss of power, my knock sensors were bad too. Once I did those, power was back in force.
CF Beginner
Joined: Mar 2024
Posts: 15
Likes: 0
From: Philadelphia
So far I've changed the coils, plugs, and wires. cleaned the throttle body and MAF sensor. I did check the compression too and the numbers came back good.
A code recently popped up for the knock sensors so that's on my list of things to fix. I think I am going to have to change the fuel injectors too because I know my cats are going bad and they might have been the culprit. I have the rotten egg smell from time to time and the cat rattling/vibration noise.
A code recently popped up for the knock sensors so that's on my list of things to fix. I think I am going to have to change the fuel injectors too because I know my cats are going bad and they might have been the culprit. I have the rotten egg smell from time to time and the cat rattling/vibration noise.
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