Author Topic: Honda jazz 2010 misfire cylinder 2  (Read 1589 times)

Lord Voltermore

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Re: Honda jazz 2010 misfire cylinder 2
« Reply #15 on: February 16, 2022, 07:33:59 AM »
My first thought was wouldnt a hole in the exhaust that affects the 02 lamda sensor throw up a code for that, not a misfire on a specific cylinder.
But on further thought maybe the ECU is trying to bring the exhaust 02 levels ( an indicator that the engine is running efficiently)  back to normal by changing engine settings, for instance by changing the fuel/air mixture . In which case the first reading that causes a fault code may be when one of the cylinders  starts to misfire slightly because  its getting the wrong fuel/air mix.   But the changes may mean the 02 sensor will be getting the correct levels, so doesnt show its own fault code.
May be of no help, and sorry if I am stating the obvious  :-[
Sorry if its too long winded. I failed my brevity exam at school. Ran out of paper.

john24

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Re: Honda jazz 2010 misfire cylinder 2
« Reply #16 on: February 16, 2022, 07:37:47 AM »
All's good thank you, the more I have to go on the more I can check :)

john24

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Re: Honda jazz 2010 misfire cylinder 2
« Reply #17 on: March 05, 2022, 07:39:09 AM »
So I checked the exhaust and looks new no leaks or holes that I can see or hear.
I checked the EGR valve and it seems good and the valve is moving freely.

On the first start car runs rough I found that if I clear the error codes and start it up again it runs smooth again
« Last Edit: March 05, 2022, 08:02:35 PM by john24 »

GBH

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Re: Honda jazz 2010 misfire cylinder 2
« Reply #18 on: March 07, 2022, 09:29:08 AM »
You say you have read the OBD11 code(s) and cleared it (them) but it is only a temporary fix.

I presume this is a generic code (which covers any number of faults rather than a specific Honda code)?  If you post up the code you have maybe someone will be more able to identify possible components to check.

Alternatively, it may be worth the cost to have the car scanned with a Honda scanner to closer identify the possible faulty component (rather than the fault).

john24

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Re: Honda jazz 2010 misfire cylinder 2
« Reply #19 on: March 07, 2022, 09:39:00 AM »
Fair point the OBD-II code I get is: P0302: Cylinder 2 → Misfire Detected

john24

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Re: Honda jazz 2010 misfire cylinder 2
« Reply #20 on: April 02, 2022, 10:04:56 AM »
So I had the ECU sent off for testing and it came back as all clear and no issues. So that can be ruled out as well.

What should be my next things to test?

olduser1

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Re: Honda jazz 2010 misfire cylinder 2
« Reply #21 on: April 02, 2022, 11:16:38 AM »
Members will help if you provide further info-
What happened/changed before the fault appeared?
When was the Jazz last serviced, when plugs changed?

embee

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Re: Honda jazz 2010 misfire cylinder 2
« Reply #22 on: April 02, 2022, 12:43:47 PM »
What have you done to cure the cylinder2 misfire? Clearing the fault code doesn't fix the problem. Is it still flagging the same fault?

Jocko

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Re: Honda jazz 2010 misfire cylinder 2
« Reply #23 on: April 02, 2022, 02:23:00 PM »
I am pleased to say that since replacing the leaky exhaust I have had no reoccurrence of P0302. So after changing plugs and coil pack made no difference, I am delighted with that result.

john24

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Re: Honda jazz 2010 misfire cylinder 2
« Reply #24 on: April 04, 2022, 11:47:27 AM »
Members will help if you provide further info-
What happened/changed before the fault appeared?
When was the Jazz last serviced, when plugs changed?
Nothing, the car just one cold morning poped up with check engine and VSA light and ran rather rough, would not change gears properly. After being turned off and then on again would run much better. Car has always been serviced at appropriate intervals. Spark plugs are essentially new as I had them changed once the issue appeared.


What have you done to cure the cylinder2 misfire? Clearing the fault code doesn't fix the problem. Is it still flagging the same fault?
I changed spark plugs and checked the EGR valve. I swapped the coils to see if the issue would jump cylinders but it did not. I also had the ECU tested for any malfunctions.


I am pleased to say that since replacing the leaky exhaust I have had no reoccurrence of P0302. So after changing plugs and coil pack made no difference, I am delighted with that result.
Was the leak obvious? or was it something really small? Also where to the in the exhaust was the leak?

Jocko

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Re: Honda jazz 2010 misfire cylinder 2
« Reply #25 on: April 04, 2022, 01:28:05 PM »
Was the leak obvious? or was it something really small? Also where to the in the exhaust was the leak?
Initially the leak was tiny. I didn't even realise I had a leak. It was a tiny break at the weld ahead of the middlebox (the one under the sill) where the mounting bracket attaches to the pipe. At no time did I notice or feel any symptoms. I would just reset the code (I could do it on the go from my ScanGauge) and that would be it for a couple of days, sometimes only for a couple of miles. Seemed to always do it on a trailing throttle, like slowing down for a roundabout or on a steepish descent.

john24

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Re: Honda jazz 2010 misfire cylinder 2
« Reply #26 on: April 15, 2022, 06:21:03 AM »
So I got under the car again to check for the exhaust leak. I had a mate for a price of cloth over the exhaust to see if it helps at the front to make things more obvious būti find nothing. However the error on the dash went away for 2 days then came back. I tried the same trick again but that didn't work.

I think I'll test the cylinder compression next to rule that out

MiniNinjaRob

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Re: Honda jazz 2010 misfire cylinder 2
« Reply #27 on: April 20, 2022, 09:44:46 AM »
Any updates?

john24

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Re: Honda jazz 2010 misfire cylinder 2
« Reply #28 on: April 20, 2022, 01:35:07 PM »
I just got the cylinder compression test kit and will try to test it this weekend.

john24

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Re: Honda jazz 2010 misfire cylinder 2
« Reply #29 on: May 18, 2022, 10:58:13 AM »
So the compression results are as follows:
C1:175psi
C2:125Psi
C3:160Psi
C4:175Psi

So cylinder 2 is low indeed, but it does not explain why the error shows misfire on cylinder 4 as well.

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