Earth spikes

Ask for and share advice on using the PicoScope kit to fix vehicles here.

Earth spikes

Postby Liteace » Wed Jun 06, 2012 6:46 pm

Ive got here an old Fiat punto with an idle problem, I was having a probe about today, black was on battery negative and red was on engine earth (rocker cover) as you can see in the uploaded file there are a lot of spikes, are they there because the lowpass filter is not active ?

Thanks

punto earth 1.psdata
(3.01 MiB) Downloaded 231 times
DONT SHOOT YOURSELF IN THE FOOT
Liteace
Guru
Guru
 
Posts: 145
Joined: Fri Jan 27, 2012 12:25 pm

Re: Earth spikes

Postby Robski » Wed Jun 06, 2012 7:25 pm

could well be interference from injection/ignition.

Whats the issue with idle ?
User avatar
Robski
Advanced User
Advanced User
 
Posts: 602
Joined: Tue Sep 14, 2010 6:36 pm
Location: Yorkshire

Re: Earth spikes

Postby Liteace » Wed Jun 06, 2012 7:45 pm

The idle is to high and takes a long time to settle after a WOT, the temp sensor is faulty 1.6 volts @ 88c, should be 0.6v and the idle stepper is a bit sticky
DONT SHOOT YOURSELF IN THE FOOT
Liteace
Guru
Guru
 
Posts: 145
Joined: Fri Jan 27, 2012 12:25 pm


Return to Diagnostic discussion

Who is online

Users browsing this forum: No registered users and 0 guests