Honda jazz 2010 misfire cylinder 2

[john24]

Hi everyone,

I need a bit of help. I got a Honda jazz 2010 1.4 iVTEC model. Recently I had a engine warning light pop up when I turned the car on and when driving in went into limp mode and would not go above 30mph. After scanning the car with OBD2 it showed error code saying cylinder 2 had detected a misfire as I haven't changed spark plugs in a while I did a charge them to be iridium ones but sadly the error came back.
To check if it's coils I switched the middle two coils to see if the issue would jump to cylinder two but sadly once again it did not.
What should be my next course of action?
Thank you

[culzean]

Hi everyone,

I need a bit of help. I got a Honda jazz 2010 1.4 iVTEC model. Recently I had a engine warning light pop up when I turned the car on and when driving in went into limp mode and would not go above 30mph. After scanning the car with OBD2 it showed error code saying cylinder 2 had detected a misfire as I haven't changed spark plugs in a while I did a charge them to be iridium ones but sadly the error came back.
To check if it's coils I switched the middle two coils to see if the issue would jump to cylinder two but sadly once again it did not.
What should be my next course of action?
Thank you

Could be ECU some posters have had ECU ignition outputs go bad.

[john24]

Hi everyone,

I need a bit of help. I got a Honda jazz 2010 1.4 iVTEC model. Recently I had a engine warning light pop up when I turned the car on and when driving in went into limp mode and would not go above 30mph. After scanning the car with OBD2 it showed error code saying cylinder 2 had detected a misfire as I haven't changed spark plugs in a while I did a charge them to be iridium ones but sadly the error came back.
To check if it's coils I switched the middle two coils to see if the issue would jump to cylinder two but sadly once again it did not.
What should be my next course of action?
Thank you

Could be ECU some posters have had ECU ignition outputs go bad.

I see, is that the contacts going bad or the ECU itself dying?

[culzean]

Hi everyone,

I need a bit of help. I got a Honda jazz 2010 1.4 iVTEC model. Recently I had a engine warning light pop up when I turned the car on and when driving in went into limp mode and would not go above 30mph. After scanning the car with OBD2 it showed error code saying cylinder 2 had detected a misfire as I haven't changed spark plugs in a while I did a charge them to be iridium ones but sadly the error came back.
To check if it's coils I switched the middle two coils to see if the issue would jump to cylinder two but sadly once again it did not.
What should be my next course of action?
Thank you

Could be ECU some posters have had ECU ignition outputs go bad.

I see, is that the contacts going bad or the ECU itself dying?

ECU fuel injector solenoid outputs can go bad, not so sure about ignition coil outputs TBH - but if an injector playing up can cause rough running and misfires. 

Read this thread

https://clubjazz.org/forum/index.php?topic=10333.msg91051#msg91051

[john24]

Could anyone guide me as to where I find the ECU module?

[Jocko]

Could anyone guide me as to where I find the ECU module?

Unless you know what you are doing, leave the ECU alone. One poster had a similar issue. After doing what you have done a garage said it was the EGR and had the EGR cleaned and that cured their problem.
I had a similar problem and after changing plugs and coils it was no better. Then what had been a wuffle from the exhaust developed into a hole and on replacing the front box the warning went away.

[Lord Voltermore]

I agree.  The problem is normally at the source of the fault, as revealed by the fault codes.  Not the computer that detects it.  ECU's can go wrong, but needs an expert , and even they might work entirely from plugging specialist equipment into  the OBD 2 port, and not touching the ecu itself.

Sorry if the answer sounds flippant, but I have never  heard of anyone learning anything from looking at an ecu  ,other than  its full of water.   Also obscures the fact I dont know where it is on a Jazz 

[Jocko]

Also obscures the fact I dont know where it is on a Jazz 

Me neither. And neither does my mechanic.

[john24]

Thanks for the responses guys.

I wanted to check where the ECU was because I would not fix this myself but would have it tested. Some people have reported this issue was caused my the ECU after which sending it off to be repaired also the repaired the issue.

During the summer the fault went away and now in the winter came back. I am now also seeing that the cylinder 4 is also reporting a misfire

[embee]

You can never say never, but car ECUs are extremely reliable due to the engineering and testing which goes into them. Unless all other possibilities have been ruled out, the ECU would be last on the list of things to suspect. If a problem is definitely electrical rather than physical, the first things to check are connectors (take apart, spray with contact cleaner, work in/out a few times).

[john24]

Could anyone guide me as to where I find the ECU module?

Unless you know what you are doing, leave the ECU alone. One poster had a similar issue. After doing what you have done a garage said it was the EGR and had the EGR cleaned and that cured their problem.
I had a similar problem and after changing plugs and coils it was no better. Then what had been a wuffle from the exhaust developed into a hole and on replacing the front box the warning went away.

Hmmmmm actually now that you mention it, when I sometimes open the door with engine still on I can hear sort of a gurgle as the exhaust pipe was right below me in the middle compared to being at the back. So your issue was a whole in the exhaust ?

[madasafish]

The ECU is on the passenger side,  behind and to the right of the battery, mounted vertically

[Jocko]

So your issue was a whole in the exhaust ?

Two holes actually. Where the bracket ahead of the middle box is welded onto the pipe. I think it was close enough to the rear O₂ sensor on the cat that it was causing the sensor to give duff information.



Bracket about 8 inches to the right of the box in this photo.

[john24]

Thanks Jocko, I will have a look at my exhaust.

What's odd is that you can't feel missire when driving, and I've had misfires on other cars and I could 100% tell that a cylinder is misfiring.

Sometimes I will start the car and it will be a bit rough, a VSA light will come on sometimes. I then turn the engine off and turn it back on and all's good, the car runs smooths and has no issues apart the check engine light being on.

[Jocko]

That was exactly the same as mine. Running smooth but telling me I had a misfire (and sometimes on more than one cylinder). Sometimes the MIL would flash for a few seconds and other times it would come on and stay on. I would reset it from my ScanGauge and sometimes it would do it more than once on one 40 mile trip.