Fuel Pump Relay question

Sun Jun 5 14:28:25 EDT 2005

Yeah, that'll shut me up :)

This has to be one of the longest running threads ever... 61 replies
now.  Sorry!

I bought a little LED at radioshack.  12volt... and has looong leads
on it.  I was thinking of  trying to use it as a test light.  Anyone
know what wires carry the electrical charge FROM the sender to the
ECU?  I'm thinking it's gotta be what.... 4.5volts or something?  Or
is it even less?  If it's 4.5, that should light the led up every time
the window passes the sensor I'd think, right?

That way, I can watch the engine and hope it stalls before my eyes and
watch to see if there's no more signal pulsing the LED when it does...
because wouldn't it still pulse even with no power,  since a hall
generator generates it's own electricty with the magnet creating power
by going through the magnetic field, etc (doesn't it? lol)?

That'd show me that the generator itself is acting weird, or has a bad
wire.  I do remember looking at the internal wires a long time ago,
and they looked fine...  And no matter how much I wiggle the
connector, it's never stalled when I do.

On 6/5/05, The Loves <theloves at localaccess.com> wrote:
> Can someone lend Chris a known good used hall sender?
> My vote is the hall sender.
> 
> ----- Original Message -----
> From: "Chris Hall" <badcomrade at gmail.com>
> To: "Ed Kellock" <ekellock at gmail.com>
> Cc: <quattro at audifans.com>
> Sent: Sunday, June 05, 2005 9:36 AM
> Subject: Re: Fuel Pump Relay question
> 
> 
> Sitting here thinking somewhat logically... I have to wonder if maybe
> I'm wrong about the lack of signal from the hall sender making the
> tach drop to 0 like a rock.  Maybe I just have that wrong in my head
> and I -think- that's what it does...  it's been so long since I played
> with that stuff I could have it all wrong in my head, and I'll owe a 6
> pack to everyone that's mentioned the hall sender that I've said
> "nope, that's not it because..."  haha.
> 
> Also, that could explain why after changing the distributor cap and
> rotor, the car ran perfectly fine for the whole week.  Maybe the wires
> under the dust cap shifted in to a position where they worked until
> they slipped back in to their "let's make the car stall) position.
> 
> I'll have to double check what happens to the tach when the hall
> sender plug (which I've shaken the HELL out of while the engine's
> running) is disconnected as the engine is running.
> 
> Still makes the whole "shaking the fusebox tray" seem odd though.
> Then again, so does the fact that the last time I did it was the most
> aggressive, and it wouldn't stall...
> 
> Maybe tomorrow I'll get the engine going, and disconnect every little
> conection I can and "record" what the tach does so I have a "master
> list" of what causes the tach to do what lol.  After all... when my
> Ignition Control Module was failing, knowing that the tach dropping to
> 0 like a stone and not tracking the rpms all the way to 0 let me know
> it was ignition related and not ecu related...
> 
> 
> 
> 
> On 6/5/05, Chris Hall <badcomrade at gmail.com> wrote:
> > Funny you should say that.
> >
> > My car used to do the same thing... engine cut-out where the tach
> > falls straight to 0 like a stone.  I used to ALSO play with the little
> > green and black wires on the coil, and somehow that seemed to get it
> > going again.
> >
> > If you listen -real- closely, when you re-attach one of the black
> > wires, some thing(s) cycle in the engine compartment.  Dunno if it's
> > the pressure regultor or the ISV or what...
> >
> > In my continuing saga...
> >
> > Today (with the plug to the ISV disconnected) 10 minutes in to the
> > drive to work, the engine cut out and cut back in once (tach "glided"
> > to 0, didn't fall like a stone as if it were an ignition problem) and
> > a few seconds later stalled out.  I poped the hood, put the ISV
> > connection back and let it cycle, then took it off.  Put in the spare
> > fuel pump relay...  Still no start.  Then for the hell of it I played
> > with the 2 ECU ground wires (which are good) and the fuel pressure
> > regulator connector (I've read that even if the FPR isn't connected,
> > the car should still run... just poorly) and I also unplugged the 2
> > green wires from the coil and the 2 black.  Got back in the car, and
> > it started on the first try.  Drove fine the rest of the way.
> >
> > When it stalled, I was on the brakes and didn't have my foot on the
> > gas.  This would usually mean the "idle switch" is suspect.  I've
> > tested it though, and it works.  Maybe I need to start testing it more
> > when I can't get started.  What a stupid little switch.  I can't even
> > SEE the damn thing... god knows you probably have to remove the whole
> > throttle body off the car to get at it  lol.
> >
> > Yesterday (dunno if you read everything I've posted... it's a small
> > novel lol) I started playing with the fuse / relay "tray" and I could
> > have -sworn- that every time I shook it (or the wires under it) that
> > the car would die.
> >
> > But last night, it wouldn't start (no matter how much I played with
> > the wires) and finally I decided to disconnect the ISV connection
> > (something that seemed to work the first ever time I had problems with
> > the car not starting) and it started RIGHT up.
> >
> > I then suspected maybe a problem with the ISV's wiring under the fuse
> > box... but I think I have to ELIMINATE that idea since the car stalled
> > today with that plug disconnected...
> >
> > So now I'm running with the "spare" FP relay in... and I don't even
> > remember at this point if I have the ISV connected or not.  I don't
> > think that matters now anyway...
> >
> > I used to wonder why people always said these cars had horrible
> > electrical systems, since my 83 CGT never had any problems.  Now I
> > know  lol
> >
> > Chris Hall
> > badcomrade at gmail.com
> > "making girls cry since 1974"
> >
> 
> 
> --
> Chris Hall
> badcomrade at gmail.com
> "making girls cry since 1974"
> _______________________________________________
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> quattro at audifans.com
> http://www.audifans.com/mailman/listinfo/quattro
> 
> 
> 

-- 
Chris Hall
badcomrade at gmail.com
"making girls cry since 1974"