Misfire behavior but no misfire

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Topic: Misfire behavior but no misfire (Read 5206 times)

armageddon

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	Misfire behavior but no misfire « on: February 25, 2017, 02:48:37 PM »

Hope someone can help.

On low load every thing is fine, but if i give it some load the engine start to shake just like misfiring, but no misfires are detected.

Log attached, if other variable are needed let me know.

thanks


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KasperH

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	Re: Misfire behavior but no misfire « Reply #1 on: February 25, 2017, 05:53:06 PM »

you got knock that sticks out with the glance i had at it, but not enough to warrent engine shaking i think.(5 degree peak)
and it also looks like youre having problems following desired AFR (probable cause of knock?)


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KasperH

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	Re: Misfire behavior but no misfire « Reply #2 on: February 25, 2017, 06:03:28 PM »

this is what im talking about with the AFR


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prj

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	Re: Misfire behavior but no misfire « Reply #3 on: February 26, 2017, 03:53:46 AM »

This is misfire. The lean spikes on WB are misfire events.


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armageddon

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	Re: Misfire behavior but no misfire « Reply #4 on: February 26, 2017, 04:52:25 AM »

Maybe a torn wastegate line?

I disabled ARMD and theres no shaking, but boost is out of control making my clutch slip.

will have to do a boost leak test, but it will have to wait a bit as my kit is with a friend...


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armageddon

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	Re: Misfire behavior but no misfire « Reply #5 on: April 01, 2017, 08:22:05 AM »

To give a conclusion to this...

It was infact misfires,but for some odd reason ecu did not assume them, in past ocasions they appear in logs and vcds, but not this time.

I have some spare coils that I replace one at a time to find that was cylinder 1 coil that was bad.

clutch was sliping because it's already a little weak and as boost was increasing fast after misfire events, it sliped.

all good now.

thanks


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prj

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	Re: Misfire behavior but no misfire « Reply #6 on: April 02, 2017, 03:46:43 AM »

I told you Wink


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