Citroen C3 2004 1.4 8v TU3JP - suspect misfire

[Steve]

Hello, can you help with the following waveform captured using your ps settings file?

The vehicle is a 2004 Citroen C3 TU 1400 cc 8 valve engine with intermittent misfires attributed to cylinders 1 and 2
Secondary ignition and injection opertaion are correct
Fuel pressure and fuel quality are good
Valve timing inspection confirms no error, I suspect possible compression issues from sticking valves

Could you analyse the attached waveforms from cylinders 1 and 2?

[admin]

Hello,
Converted files is attached

CYLINDER 2 P0302.p.mwf

(11.69 MiB) Downloaded 1663 times

CYLINDER 1 P0301.p.mwf

(15.8 MiB) Downloaded 1634 times

To run automatic analysis, in the USB Oscilloscope software select menu Analysis => Execute script

1. Your pressure sensor is inaccurate, so received pressure graphs are distorted and the Px script report may not be accurate.
2. When you recorded the signals from the 1st cylinder, you snap the throttle incorrectly - you pressed the accelerator pedal too smoothly. Therefore, here the Px script report is incomplete.
Signals recording from the 2nd cylinder is OK.

PS:
The CSS script is used to determine the causes of the misfires.
You can record signals for the script using the settings file -

CSS.pssettings

(3.99 KiB) Downloaded 1295 times

[Steve]

Thank you for the feedback.

I will study the results using the PDF file as I am fascinated by the contents in the report for cylinder 2.

The vehicle is now off site but I will try to obtain the crank signal data as soon as possible.

Once again, thank you

[Steve]

Hello again, sorry for the delay

Here is the crank signal as per the script video

Citroen_C3_2004_Petrol_20170710-0001.psdata

Crank signal with ignition sync

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Regards, Steve

[admin]

Hello,
Converted files is attached

Citroen_C3_2004_Petrol_20170711-0001.p.mwf

(7.83 MiB) Downloaded 1602 times

On your record, misfires at idle speed are not detected, since the engine was running idle for a short period of time. Please record the signals again, and allow the engine to idle for a longer (up to 1 minute) to manifest the malfunction and capture it on the recording.

PS:
Your ignition spark sensor is very inaccurate.