Search found 37 matches

by Matt Fanslow
Sat Feb 25, 2012 12:56 am
Forum: Diagnostic discussion
Topic: Jumped timing chain ID with a scope
Replies: 29
Views: 18269

Re: Jumped timing chain ID with a scope

Very nice post, Richard.

Thanks!
by Matt Fanslow
Tue Aug 10, 2010 7:00 pm
Forum: Automotive kit hardware
Topic: WPS500X
Replies: 1
Views: 2842

Re: WPS500X

Tools >>> Preferences >>> Regional & Language. You can change the Language and Measurement System from there.

WPS500X is safe to use with gasoline and thus should be safe with benzine.

HTH. Later, Matt.
by Matt Fanslow
Fri Aug 06, 2010 10:27 pm
Forum: Diagnostic discussion
Topic: primary ignition principle
Replies: 5
Views: 5507

Re: primary ignition principle

Right, the collapsing magnetic field induces voltage in the primary, as well as the secondary. We basically see a reflection of what is happening in the primary in the secondary as well as a reflection of the secondary in the primary, depending on the part of the pattern we discuss. In your example ...
by Matt Fanslow
Fri Aug 06, 2010 6:24 pm
Forum: Diagnostic discussion
Topic: primary ignition principle
Replies: 5
Views: 5507

Re: primary ignition principle

You seem to be forgetting that the control side of the primary has to be released before the magnetic field can collapse.

HTH. Later, Matt.
by Matt Fanslow
Tue Jul 20, 2010 8:37 pm
Forum: Automotive kit hardware
Topic: air mass meter defective?
Replies: 5
Views: 4936

Re: air mass meter defective?

You shouldn't really need to hit the rev limiter. The initial gulp of air is going to be about as much air as the engine can ingest.

I would expect the Lambda sensor to reflect fuel being added.
by Matt Fanslow
Mon Jul 19, 2010 8:43 pm
Forum: Automotive kit hardware
Topic: air mass meter defective?
Replies: 5
Views: 4936

Re: air mass meter defective?

On that engine/system I would expect to see an initial "spike" of over 4.5 volts. This is assuming you are snapping it WOT like you don't own it. A quick look at fuel trims may also aid you in condemning the MAF.

HTH.

Later, Matt.
by Matt Fanslow
Mon Jun 07, 2010 3:01 pm
Forum: Automotive kit hardware
Topic: scoping MAF-MAP on late diesels
Replies: 13
Views: 10883

Re: scoping MAF-MAP on late diesels

If we can just have low-pass filtering work with the frequency graphing and be able to filter out the ignition "noise" that would be great. To be honest, usually if I'm scoping a MAF it's to prove what I already suspect. So off-the-cuff I can't think of anything to add for testing of MAFs beyond wha...
by Matt Fanslow
Fri Jun 04, 2010 7:29 pm
Forum: Diagnostic discussion
Topic: Speedometer signal testing
Replies: 5
Views: 5901

Re: Speedometer signal testing

You will not be able to derive the information you seek by scoping communication lines. You will require a scan tool that can communicate with all the modules involved. If power and ground are at the module not displaying vehicle speed and the communication lines are active (a clue would be other fu...
by Matt Fanslow
Wed Jun 02, 2010 8:49 pm
Forum: Diagnostic discussion
Topic: Speedometer signal testing
Replies: 5
Views: 5901

Re: Speedometer signal testing

Just so we are clear, you wish to scope the communication lines between modules to ascertain where the VSS information is being lost?

Thanks.
by Matt Fanslow
Tue Jun 01, 2010 6:27 pm
Forum: Automotive kit hardware
Topic: scoping MAF-MAP on late diesels
Replies: 13
Views: 10883

Re: scoping MAF-MAP on late diesels

I've received some comments about the spikes on the frequency graph. I've taken a second capture with a greater number of requested samples and loaded it here: http://www.wavehook.com/dbase/bigpic.html?hello=1597.gif&id=1599.gif. You can download the .psdata from there and manipulate it as you please.