Search found 319 matches

by Fat Freddy
Tue Feb 26, 2013 4:35 am
Forum: Diagnostic discussion
Topic: An ignition question
Replies: 11
Views: 7021

Re: An ignition question

VR CKP sensor Yer. I had thought about that before posting. I don't use AC coupling myself as I want to know exactly whats happening. The rejection of low sigal frequecies is probably what bothers me. AC coupling. In this mode, the scope device rejects very low signal frequencies below about 1 hert...
by Fat Freddy
Tue Feb 26, 2013 3:34 am
Forum: Diagnostic discussion
Topic: An ignition question
Replies: 11
Views: 7021

Re: An ignition question

AC coupled on channel C?


HTH
FF
by Fat Freddy
Mon Feb 25, 2013 12:02 pm
Forum: Case studies
Topic: Lotus Esprit with low compression
Replies: 40
Views: 63830

Re: Lotus Esprit with low compression

Bump!
Resolve?
Lol.

FF
by Fat Freddy
Fri Feb 15, 2013 5:55 am
Forum: Diagnostic discussion
Topic: New coil + Ign module
Replies: 26
Views: 15734

Re: New coil + Ign module

no PCM, its an old 1983 Ford mustang 2.3 pinto, with a carb & conventional ignition system My apologies. :oops: You did say that at the start. The GM module sent me off. ie. How is it possible for the coil current to still be 6A after the PCM has removed ground path. I assume this from what is bein...
by Fat Freddy
Thu Feb 14, 2013 8:01 am
Forum: Diagnostic discussion
Topic: New coil + Ign module
Replies: 26
Views: 15734

Re: New coil + Ign module

The module is a GM hei unit with built in current limiter Is this a DFI with EST and bypass control? What was the original fault? Have you looked at the IC from the PCM. And for interest. Here's a similar capture from a Mazda, new coil and module also. As far as I got was it appeared to be caused b...
by Fat Freddy
Thu Feb 14, 2013 7:30 am
Forum: Diagnostic discussion
Topic: I.A.C Valve????
Replies: 26
Views: 13520

Re: I.A.C Valve????

Thanks guys. I wasn't too sure if I had it right.

And a nice bit of extra info on error detection there. Thanks Kim


FF
by Fat Freddy
Tue Feb 12, 2013 3:11 am
Forum: Diagnostic discussion
Topic: I.A.C Valve????
Replies: 26
Views: 13520

Re: I.A.C Valve????

Oh crap, sorry I didn't read your post before posting my response. I agree with you completely. :lol: :lol: :lol: Voltage spikes indicate current flow Would this only apply where an inductive circuit is operating correctly? In other words the lack of a spike could indicate poor current flow or a sh...
by Fat Freddy
Tue Feb 12, 2013 2:26 am
Forum: Diagnostic discussion
Topic: New coil + Ign module
Replies: 26
Views: 15734

Re: New coil + Ign module

That current bounce looks a bit odd. It appears to stop/slow down the coil collapse.
by Fat Freddy
Sun Feb 10, 2013 10:01 am
Forum: Diagnostic discussion
Topic: Inductive peak to peak volts
Replies: 3
Views: 2946

Re: Inductive peak to peak volts

Found this capture today from an Audi showing 63V peak to peak @ 5300RPM
Image

HTH
FF
by Fat Freddy
Sun Feb 10, 2013 8:56 am
Forum: Automotive kit hardware
Topic: How to create reliable stable Current Drain
Replies: 13
Views: 11197

Re: How to create reliable stable Current Drain

Have you considered making your own resistive load using Nichrome wire? http://en.wikipedia.org/wiki/Nichrome
Same as your heater element but customised to your needs.

HTH
FF