Autonerdz forums

Hi Lawrence

Do you have a psd file to show here? There are some great guys willing to help you with your questions.

you will find every running engine has a different wave. But cranking waves are a little bit easier to interpretate.

Mick

the easiest way to use the first look sensor in the exhaust , FLSE , is to use it with AceMisfireDetective .
AMD does the translation and sees things i can not . but i keep trying .

    dont forget that the exhaust pulse you see does  not match  the cylinder fireing , there is an offset , which truly kicked my butt at first and still does off idle.   

the latest version of ANNO wave from AES wave has the ability to put a transparency with pre marked things over the top of saved waveforms and imho you should build that or something like it into your learning curve .       but there really isn't anything quite like it   paint.net  can also build layers on top of waveforms .... but  i dont want to learn to be a graphics designer to operate it  and it uses gobs of memory to save files  ...

anno wave files wont open here but they can be saved as gif files which do open here .   

my thoughts are to create templates in anno wave to overlay on top of pico 6 captures that cover 720 degrees of engine rotation ... so you can sync on spark or ... and see where things happen in the engine the anno wave template can be expanded and contracted without loosing the relative position of things  noted in it ... to match the 720 degrees plucked out of a larger pico 6 capture ....
                          
    but it has been a little busy
    AMD capture with sticking exhaust valve and ...
   

Hi Members,
  This is first attemp to understand the offset.  Not sure really how to read yet.  Trying to understand wich is the exhaust valve.  The link that Romain supplied helped alot (not in the manual I received).  Sure may have tested wrong.  Any help gladly accepted.  Thanks

Jeff

Hi Rich,
  I will try that, always getting buggy before horse.  Thanks

Jeff

Keep in mind that there are 3 exhaust valves open at once
To check for mechanical problems do a cranking test with the throttle wide open
I can do a more detailed version with the exact timing if you like
Need the exact engine cam specs
This is not usually necessary because the exhaust pipe distorts the pulses somewhat anyway

If you do this exhaust test with a 4 cyl it is easier to see since there is only one exhaust valve open at a time
I like to start here to learn because it is so much easier

You can always do your test like you did either running or cranking with one spark plug out and see the result
All engines are a bit different because of different exhaust lengths and bends

Play around
It is a blast

Pretty soon you will be doing it with one FLS hooked to the exhaust and one to the intake and yet another on the fuel rail

Hi Group:


I got an idea , lets take a truck that has a problem and play with it .



I just happen to have a truck to play with.

I have an 95 Ford F150 5.0 with an engine problem the computer shows misfire in number 7 and 8 cylinder.

The engine has a misfire and a knock coming from around #4 cylinder like  a lifter maybe

Here is the pico diagnostics compression test.

Hopfully somebody can fill in the blanks and we will see where we end up.

I have not done any compression test or secondary ignition yet but we can the customer does not want to fix but we can learn from this junker.

It is really storming here so bare with me as I hold my lap top tight.

Here is with TP open cranking