question on inpa image.
 

hello to all
need help with meaning of this image from inpa i know it has to do with the cylinders it seems cylinder 5 and 3 are not running 100% or am i looking at it wrong thanks

It means the crankshaft is either accelerating faster or slower (positive vs negative value - I forget which) when those cylinders fire as compared to the other cylinders.


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It means you have a misfire.

i've been seen that screen for over 9 months misfire.?? how come i don"t get a sel light for misfire on those cylinders

ok today i had the time so i change the coil and spark plug for cylinder#5 but the reading looks the same
maybe has to do with injector.????

It is still well within the green range. I don't think you would get a code until it crosses into the red range on the graph.

Those bar graphs are fine. Why would you replace anything??

Upallnight has no clue about this software and constantly talks craps about it. He's never even plugged INPA into a car before. I honestly can't believe he led you believe you have a misfire over a smoothness graph..... Lol!

thanks will leave alone the coil were spare i had for back up

Hey Helihover,:stickpoke

Find another post in which I talked crap about INPA. I'm the guy that usually tell people on this forum to get their X scan before replacing parts.

I just stated that the graph represent a misfire. If you look at any of my past posts on misfire I always stated that a misfire is interpret by the computer as a cylinder(s) not producing the same amount of power as the other cylinders. No where did I tell 1iwilly to go replace any parts.

This was also confirm by Garrett Fell who posted the following "It means the crankshaft is either accelerating faster or slower (positive vs negative value - I forget which) when those cylinders fire as compared to the other cylinders. " Garrett Fell is very experience in using INPA.

When a cylinder does not produce as much power as the other cylinder, it rotational speed is noted by the computer as a misfire. After so many misfires it will set a SES code and sometime cut off fuel to that cylinder. Shutting the engine down reset the misfire counter in the computer. That's why people sometime post that if they restart the engine the misfire is gone.

Why didn't you chime in to this thread when 1iwilly posted the thread and you saw my post?

Sorry. Didn't see the post when first posted.

These are smoothness graphs and on some models, this graph is called a roughness graph. If your compression is a bit off as 99% of mass produced engines are, your graph would follow something similar as posted above. I've tested silky smooth engines with these graphs and they are always off a bit.

Misfires throw a fault code.