5.3 misfiring
March 31st, 2023, 6:51 PM
#1
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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?
March 31st, 2023, 7:24 PM
#2
CF Monarch
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?
Today, 1:48 PM
#4
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Join Date: Aug 2024
Location: NJ
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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.
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