Search found 8 matches

by Henri Malcorps
Tue Aug 25, 2015 7:34 am
Forum: Diagnostic discussion
Topic: Ignition waveform question
Replies: 5
Views: 6968

Re: Ignition waveform question

When using the ignition pickup on different cars I often get rather different results. So I did some thinking about the principle of functionning, see attachment. I would appreciate very much to get comments on this.

Henri
by Henri Malcorps
Mon Feb 02, 2015 11:11 am
Forum: Diagnostic discussion
Topic: Waste spark wave form question
Replies: 8
Views: 10823

Re: Waste spark wave form question

Roadserpent, Are you sure you have a good earth connection for the pickup? Your sparkline seems to be too low to me, normaly it should be about 2 kV. Also for the cylinder without oscillation: the voltage after the sparkline returns to the same level as during the spark and is decreasing very slowly...
by Henri Malcorps
Mon Feb 02, 2015 10:19 am
Forum: Diagnostic discussion
Topic: Waste spark wave form question
Replies: 8
Views: 10823

Re: Waste spark wave form question

Thank You Roadsepent, Variations between 10 and 20 kV seems very high to me. I don't know the PICO scoop, but are you sure you are not undersampling your signal. If the firing line is about 1µs wide and your sample period is also 1 µs, you can sample anywhere on the firing line and you can have a ve...
by Henri Malcorps
Sat Jan 31, 2015 9:02 pm
Forum: Diagnostic discussion
Topic: Waste spark wave form question
Replies: 8
Views: 10823

Re: Waste spark wave form question

Hello Roadserpent, I couldn't open your attachment but the oscillations at the end of the spark line, to check if there is sufficient energy in the coil, is no longer a valid test. I have a MGTF of 2005 which has also a wasted spark ignition system and there is only one oscillation after the spark l...
by Henri Malcorps
Wed Oct 15, 2014 5:46 am
Forum: Help me fix my car
Topic: Cylinder misfire identification with WPS 500
Replies: 9
Views: 12567

Re: Cylinder misfire identification with WPS 500

Hello Terbo, What kind of engines did you test? Interpretation of 4 cylinders is rather easy but I didn't really succeed in interpreting the exhaust signal of my Rover V8. I use a WPS 500 on the zoom function 2 with an Owon scoop. I tried to put a powerpoint with a few slides in attachment, but don'...
by Henri Malcorps
Thu Aug 21, 2014 12:37 pm
Forum: Help me fix my car
Topic: Cylinder misfire identification with WPS 500
Replies: 9
Views: 12567

Re: Cylinder misfire identification with WPS 500

Robsky: my scanner and exhaust pressure both indicate cylinder 3. I tried all possible settings of my wps. Maybe also the pressure regulator is stuck. I have no reference waveform except one on this Pico site.
by Henri Malcorps
Thu Aug 21, 2014 12:24 pm
Forum: Help me fix my car
Topic: Cylinder misfire identification with WPS 500
Replies: 9
Views: 12567

Re: Cylinder misfire identification with WPS 500

Arian: access is difficult, connection is about 20 cm. It is a wasted spark ignition. Same coil for cylinder 3 and 2. I didn't do a leak down ore compression test, but MAP with my scanner was OK.
by Henri Malcorps
Wed Aug 20, 2014 4:33 pm
Forum: Help me fix my car
Topic: Cylinder misfire identification with WPS 500
Replies: 9
Views: 12567

Cylinder misfire identification with WPS 500

I have a misfire on cylinder 3 of my MGTF and try to verify if it is due to the injector. For this reason I connected my WPS 500 at the vacuum inlet of the pressure regulator but I was unable to obtain a significant output signal. I was able to obtain valid signals from the exhaust and the vacuum, b...