Hi, Apologies if I have not understood your question correctly but I am assuming that you are asking if you can plot a graph of RPM / duty cycle against time? At the moment, duty cycle is available only as a measurement but any frequency can be plotted as a graph, RPM included. On all scopes this ca...

Matt Dixon from Southern Illinois University Carbondale has put together a great presentation on the different types of coil on plug ignition (COP). A presentation can be found here http://opensiuc.lib.siu.edu/auto_pres/24/ A shorter article based on the same material was published in the July 2011 ...

Welcome to the forum!

Hi,

This app note / case study may help

http://www.picoauto.com/tutorials/cat-efficiency.html

Regards
Alan

I just found an example off a Aston Martin V8 Vantage that is probably similar (possibly the only time I have said that a Renault Scenic is similar to an Aston Martin :wink: ) . Here we are DC coupled so on a 20V range: ABS.gif Now flip to AC coupling ABS AC.gif Tom is correct of course though (he u...

Hi, Please could you upload the waveform then we should be able to comment. There are several types of these sensors so without knowing which sort you were looking at my guess is that they are of the current switching type (switch between 5mA and 15mA ish). When viewed as a voltage you see typically...

Hi,

Normally Bank 1 S1 would be pre cat and Bank 1 S2 would be post cat. Are you sure which sensor is reporting a problem?

Alan

Hi, I am not sure what type of sensor the post cat one is, but what you describe may well be normal. Pre cat sensors will typically be switching rich / lean but you expect the post cat sensor to be sitting at a fairly steady level unless there is a problem with the catalytic converter. If you blip t...

Hi, Sorry to take a while to reply, but to be honest I am not that familiar with return flow testing and every time I thought to ask someone else here they were on holiday. You mention a couple of advantages of using this technique over the low cost kits: 1. Testing under load. I can see the advanta...

The reason for the change to the single filament bulbs is mostly to save weight and cost by running one less wire from the front of the car to the lights at the back. Its something we are going to see more of (although the single filament bulbs are on their way out as LEDs take over). I am not sure ...