Citroen C3 2004 1.4 8v TU3JP - suspect misfire

Automatic analyzing the cylinder pressure waveform
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Steve
Posts: 3
Joined: Mon Jun 19, 2017 11:33 am

Citroen C3 2004 1.4 8v TU3JP - suspect misfire

Post by Steve » Sat Jun 24, 2017 6:17 pm

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?
Attachments
CYLINDER 2 P0302.psdata
Cylinder 2
(25.65 MiB) Downloaded 205 times
CYLINDER 1 P0301.psdata
Cylinder 1
(33.2 MiB) Downloaded 193 times

admin
Site Admin
Posts: 17
Joined: Sun Mar 01, 2015 3:34 pm

Re: Citroen C3 2004 1.4 8v TU3JP - suspect misfire

Post by admin » Sun Jun 25, 2017 8:52 pm

Hello,
Converted files is attached
CYLINDER 2 P0302.p.mwf
(11.69 MiB) Downloaded 200 times
CYLINDER 1 P0301.p.mwf
(15.8 MiB) Downloaded 216 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 222 times

Steve
Posts: 3
Joined: Mon Jun 19, 2017 11:33 am

Re: Citroen C3 2004 1.4 8v TU3JP - suspect misfire

Post by Steve » Wed Jun 28, 2017 2:59 pm

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
Posts: 3
Joined: Mon Jun 19, 2017 11:33 am

Re: Citroen C3 2004 1.4 8v TU3JP - suspect misfire

Post by Steve » Mon Jul 10, 2017 9:00 pm

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
(16.72 MiB) Downloaded 217 times
Regards, Steve

admin
Site Admin
Posts: 17
Joined: Sun Mar 01, 2015 3:34 pm

Re: Citroen C3 2004 1.4 8v TU3JP - suspect misfire

Post by admin » Tue Jul 11, 2017 2:38 pm

Hello,
Converted files is attached
Citroen_C3_2004_Petrol_20170711-0001.p.mwf
(7.83 MiB) Downloaded 205 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.

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