rapid change pulse width????? for no reason

[jmar243]

I have a LBZ with 60 over sticks, dual cp3
EFI scan tool shows when the motor is at 1900 rpms at 25% throttle (usually happens when i am towing) the pulse width will go from 756 to 3300 for a very short period of time then drop back to 756.
If i go to 100% throttle it goes away, if i downshift and maintain throttle position it gets worse.
I tried many different toons and they all will do this?


Can anybody help me out???????????????????

 

[2500HeavyDuty]

do you have logs of the tunes?

 

[jmar243]

yes but i am not sure how to save a part of the data log to post on here
but the line is going along straight and then all of a sudden it spikes straight up and straight down and continues straight.
i cannot figure out what would be making it do that????

 

[JoshH]

What is your rail pressure doing?

 

[Whitetail Addict]

yes but i am not sure how to save a part of the data log to post on here

Jon, take a picture of the log...

To post it...click post reply...then at the top of the text box you will see a paper clip "add attachments"...add the log photo as an attachment.

Hope that helps.

 

[2500HeavyDuty]

and does it do that with a stock tune?

 

[jmar243]

and does it do that with a stock tune?

it does that with all toons, stock, fleece, custom,
rail pressure is staying consistent, it might drop like 500 psi when it does that

 

[ColbyColorado04]

screen print view of the section of log.....

 

[jmar243]

this is what the scan tool shows

some times it does it more some time it just does it one time

 

[DuramaxPowered]

Nice, a cell phone camera screen shot:rofl:........

 

[JoshH]

That is really odd. Would you be willing to email me a log and the tune that goes with it? I'd like to look and see if I can find anything. I'll PM you my email address if so.

 

[Whitetail Addict]

Nice, a cell phone camera screen shot:rofl:........

What is the proper way to do a screen shot of a log?

 

[JoshH]

What is the proper way to do a screen shot of a log?

Print screen, paste into Paint, and save as an image is the best way.

 

[Whitetail Addict]

Print screen, paste into Paint, and save as an image is the best way.

Thanks Josh.

 

[jmar243]

i put a single cp3 belt on and disconnected the dual cp3 controller
and it still changes pulse for no reason.
what would the chances be that it is the ecm?