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Author Topic: Mis fire bank 2 cylinder 2 4 6 after engine rebuild  (Read 4395 times)

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moh

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Mis fire bank 2 cylinder 2 4 6 after engine rebuild
« on: 14 February 2014, 17:18:53 »
Hello every body
I rebuild my 3.2  engine
The engine start with misfire in bank 2
(The  rpm is lower than 500)
The O2 sensor for  bank 2  read zero mv
The air mass flow is 23 kg/h
I check the following but the problem stay
The time pelt
The o2 sensor
The ICM
Throttle
Gas pressure
Air  mass filter .
Please can any one provide me with any other suggestion
Thank you


 
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05omegav6

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Re: Mis fire bank 2 cylinder 2 4 6 after engine rebuild
« Reply #1 on: 14 February 2014, 17:26:04 »
What fault codes do you have :-\
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moh

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Re: Mis fire bank 2 cylinder 2 4 6 after engine rebuild
« Reply #2 on: 14 February 2014, 17:31:57 »
P0302, 0304, 0306 and random misfire i forget the code
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05omegav6

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Re: Mis fire bank 2 cylinder 2 4 6 after engine rebuild
« Reply #3 on: 14 February 2014, 17:38:11 »
Quote from: moh on 14 February 2014, 17:31:57
P0302, 0304, 0306 and random misfire i forget the code
0300 :y

Is the wiring connector of the 246 coil pack plugged in securely :y
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moh

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Re: Mis fire bank 2 cylinder 2 4 6 after engine rebuild
« Reply #4 on: 14 February 2014, 18:23:24 »
The coil pack was changed several times 
And the connection was tested 

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05omegav6

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Re: Mis fire bank 2 cylinder 2 4 6 after engine rebuild
« Reply #5 on: 14 February 2014, 18:46:09 »
Ok...

Are the spark plug wells dry and free from oil?
Have you removed the spark plugs to check them for any signs of fouling?
Is the coil pack a genuine GM/Bosch one :-\
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martin42

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Re: Mis fire bank 2 cylinder 2 4 6 after engine rebuild
« Reply #6 on: 14 February 2014, 19:17:59 »
Im betting the timing is out on that bank.
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moh

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Re: Mis fire bank 2 cylinder 2 4 6 after engine rebuild
« Reply #7 on: 14 February 2014, 20:19:46 »
 The sparks plug and the coil pack is genuine GM
The time pelt is aligned
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moh

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Re: Mis fire bank 2 cylinder 2 4 6 after engine rebuild
« Reply #8 on: 14 February 2014, 20:23:34 »
Sorry the spark plugs are tested and they r okay
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moh

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Re: Mis fire bank 2 cylinder 2 4 6 after engine rebuild
« Reply #9 on: 14 February 2014, 20:28:44 »
In the garage they told me that the AMF should be half mine (around 10 mine is 23 kg/h)
I dont know if this is a side effect or the cause of the misfire
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tunnie

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Re: Mis fire bank 2 cylinder 2 4 6 after engine rebuild
« Reply #10 on: 14 February 2014, 20:57:43 »
MAF? Tried unplugging it and running?
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moh

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Re: Mis fire bank 2 cylinder 2 4 6 after engine rebuild
« Reply #11 on: 14 February 2014, 21:10:38 »
Tried unplugging the MAF and run but no thing happens
The code disappear when the rpm is high :(
 
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Andy H

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Re: Mis fire bank 2 cylinder 2 4 6 after engine rebuild
« Reply #12 on: 14 February 2014, 22:06:23 »
Do a compression test (on all 6 cylinders)

If all cylinders read the same then carry on looking at fuel & ignition systems.

If there is no compression on 2/4/6 then go back and check the cam timing.
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moh

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Re: Mis fire bank 2 cylinder 2 4 6 after engine rebuild
« Reply #13 on: 15 February 2014, 06:38:58 »
I do the compression test and all 6 cylinders gives the same reading
Also the fuel system is tested and found no problem with it
The coil pack and sparks are tested
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Andy H

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Re: Mis fire bank 2 cylinder 2 4 6 after engine rebuild
« Reply #14 on: 15 February 2014, 10:41:52 »
Quote from: moh on 15 February 2014, 06:38:58
I do the compression test and all 6 cylinders gives the same reading
So cam timing OK and no bent valves :y

Quote from: moh on 15 February 2014, 06:38:58
Also the fuel system is tested and found no problem with it
The coil pack and sparks are tested
You are looking for something that only affects one side of the engine.

The fuel rail serves all six injectors so fuel doesn't seem to be the issue. That leaves ignition as the most likely cause. :-\

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