misfire opel corsa 1,2 help

Ask for and share advice on using the PicoScope kit to fix vehicles here.
Post Reply
morito
Newbie
Posts: 2
Joined: Sun Jan 03, 2021 6:54 pm

misfire opel corsa 1,2 help

Post by morito »

Good evening,
I have an opel corsa 1.2 16v x12xe engine with a failure in cylinder # 3, it fails at all times and the scanner says it has misfire in cylinder 3, it has changed the injectors to be tested and spark plugs and coil, compression Measure gives us 12kg but the engine fails as soon as we start, I send an oscillogram to see if someone can help me, I don't have much experience with picoscope
I think of an escape fault but can someone explain to me how to understand the oscillogram
Thank you very much in advance
regards
Attachments
Opel_Corsa C_2003_Petrol_captura buena presion gases.psdata
(8.88 MiB) Downloaded 89 times

liviu2004
TwoWaves
TwoWaves
Posts: 345
Joined: Sat Mar 19, 2016 8:23 am
Location: Netherlands

Re: misfire opel corsa 1,2 help

Post by liviu2004 »

Maybe Z12XE?

12 bar not 12 kg?

I’ll have a look on the waveform, tomorrow, now it’s night.

ktl2019
OneWave
OneWave
Posts: 10
Joined: Fri Mar 19, 2021 3:42 pm

Re: misfire opel corsa 1,2 help

Post by ktl2019 »

The burning volatage line are on all cyl not good, but on third cyl. it is the badest

liviu2004
TwoWaves
TwoWaves
Posts: 345
Joined: Sat Mar 19, 2016 8:23 am
Location: Netherlands

Re: misfire opel corsa 1,2 help

Post by liviu2004 »

There are several problems here as I can see however:
- add channel description, what am I looking at?
- is the ignition channel connected to spark plug 3? Why do I see 4 ignition events?

1. Exhaust pressure is too high, 430 mbar, possible blocked exhaust, remove oxygen sensor 1 and repeat test.
2. Ignition event 21 degrees before top dead center at 890 rpm? This looks like chain out of time to me.

Remove cylinder head cover, check chain for slack and camshafts for position in reference to the crankshaft.

User avatar
Grant_Baker
OneWave
OneWave
Posts: 24
Joined: Tue Feb 07, 2017 10:58 pm

Re: misfire opel corsa 1,2 help

Post by Grant_Baker »

I see CH A is a custom probe "PRESION CILINDRO."

Since you are not using a WPS500, your zero(atmospheric pressure) level is probably wrong due to the characteristics of your pressure transducer when exposed to heat and the dynamic pressure conditions of a running test. Do you have an analog backpressure gauge you can put in an upstream exhaust sensor hole to verify exhaust backpressure?

kona
TwoWaves
TwoWaves
Posts: 65
Joined: Thu Feb 22, 2018 8:14 pm

Re: misfire opel corsa 1,2 help

Post by kona »

Hi,
The problem is a mechanical failure.
Cyl. 3 EXHAUST VALVE :cry:

morito
Newbie
Posts: 2
Joined: Sun Jan 03, 2021 6:54 pm

Re: misfire opel corsa 1,2 help

Post by morito »

Sorry for the delay, in the end the problem came from a loose screw in the exhaust camshaft number 2 and another broken support number 5 in the intake camshaft
Thank you very much for your interest and your help
Attachments
Inked311971418_1_LI.jpg

Post Reply