Weak part
Todd Phenneger
tquattroguy at yahoo.com
Fri Dec 19 03:51:43 EST 2003
James,
Yes, it all matches. Keep in mind I've been driving the car
for a couple years, it has probably 20k miles on the turbo
conversion. I have however tried swapping out all ignition
parts for parts off my 5ktq which runs fine. The 4ktq was
running the older style cap/wires but now with the 5ktq Ignition
parts on there its running the newer style pin style cap/wires
etc.
Its so frustrating. NOw wiht the new parts on there I'll need
to go back throught the test sequence agian and check all 5
plugs plus coil wire for spark.
Thanks
Todd
--- James Bell <doublem at srv.net> wrote:
> T.P:
>
> Your right... I just saw the 4000Q!.
> Your distributor rotor/cap/wire lash-up
> sounds suspect. You need to Assure the
> match up between Rotor and cap. There
> are different 5 cylinder rotors/caps not to
> mention the variation in Manufacture.
> Rotor Gap to Cap, Gap specification?.
> Are the wires ends the Center pin type? or the
> old barrel type? is the cap a center pin type or
> barrel type. Do they match? One kind does not
> work with the other.
>
> J.B. in Idaho
> ----- Original Message -----
> From: "Todd Phenneger" <tquattroguy at yahoo.com>
> To: "James Bell" <doublem at srv.net>
> Sent: Thursday, December 18, 2003 3:53 AM
> Subject: Re: Weak part
>
>
> > James,
> > NOt sure if you caught my earler posts last week. The
> Coil,
> > cap, rotor, wires, plugs have all been either replaced with
> new
> > ones or swapped over from a running 5ktq.
> > I dont have an ignition module though, its inside the ECU.
>
> > 10v Turbo Motor. :-0
> > I spose I could scope the distributor itself. But what
> could
> > be wrong with it.
> > I do get a very viscious and visable spark if I go
> straight
> > from the coil wire. But then as it enters the Dist its gone
> by
> > the time it makes it to the plugs. No Spark. Yet I've
> swapped
> > all those things out. Grrrr
> > I'll keep looking though.
> > Thanks
> > Todd
> >
> > --- James Bell <doublem at srv.net> wrote:
> > > T.P:
> > >
> > > Swap out the ignition module with a known
> > > Good one. Near the ECU under dash.
> > > Swap out The coil with a known
> > > good one. Swap out the dist with a known
> > > good one. One at a time. It will show it self.
> > > Then you whip it. That is the way the Monkey
> > > Lads at the Stealerships do it.
> > >
> > > J.B. in Idaho
> > > ----- Original Message -----
> > > From: "Todd Phenneger" <tquattroguy at yahoo.com>
> > > To: "Quattro List" <quattro at audifans.com>
> > > Sent: Wednesday, December 17, 2003 2:47 PM
> > > Subject: Re: Weak Spark
> > >
> > >
> > > > Ok guys,
> > > > Sunny Day in Seattle again. (FINALLY) so I went out
> to
> > > the
> > > > 4ktq to troubleshoot a little more. I went through the
> Coil
> > > > testing procedure in the Bently and on SJM's website.
> > > > http://www.sjmautotechnik.com/nostart.html#switch
> > > > is the link to the page I was referencing.
> > > > So, as per SJM and Bently, I have 12v at the ECU, both
> ECU
> > > > grounds are good. All engien groudns are good. Some
> > > doubled up
> > > > for backup. As per the check for the Coil and Output
> stage
> > > > here are my finding.
> > > > 1) I am not able to read the .2v across the Ign Booster
> > > > transistor connector while cranking. My MM Gauge does
> > > fluctuate
> > > > though as if its reciving some sort of signal so I'm
> > > guessign
> > > > that it is just not fast enough to register the Voltage.
>
> > > Only
> > > > way to know for sure is to hook up an LED test light I
> > > suppose.
> > > > I do register .2v at that connector when the ignition is
> ON
> > > > however, but as soon as I crank it fluctuates.
> > > > 2) While Cranking Voltage at ECU is 10.2v Thats within
> > > Spec.
> > > > 3) Voltage at Coil is 12v and while cranking is 9.9 -
> 10v.
> > > > Again within spec.
> > > > 4) Coil resistance checks as per bently are within Spec.
>
> > > Coil
> > > > has also been swapped with known good coil.
> > > >
> > > > What gives. The coil checks out as fine. The plug
> wires,
> > > > rotor, cap are all replaced. The ECU "appears" to be
> > > sending a
> > > > good signal to the coil, and the coil has 12v power. So
> why
> > > the
> > > > heck do I get no spark or weak spark?
> > > > Oh yea, I dumped codes after cranking and get nothing.
>
> > > Also,
> > > > resistance of wire from ECU to Coil checks out Ok. 8-9
> ohms
> > > I
> > > > believe.
> > > > Thanks
> > > > Todd
> > > >
> > > >
> > > > --- SJ <syljay at optonline.net> wrote:
> > > > > Have you checked the Hall Effect sensor in the
> > > distributor?
> > > > > There was a thread on how it works not too long ago.
> > > > >
> > > > > Bentley has the procedure for checking it.
> > > > >
> > > > > The basic system works like this.
> > > > > Hall effect sensor------>Ign ctrl unit----->ign
> > > > > coil--->distributor
> > > > > There is also a Ignition Booster module that has
> inputs
> > > and
> > > > > outputs to the
> > > > > Ign ctrl unit.
> > > > > I'm not sure what the function of the Booster is,
> maybe
> > > > > amplify the Hall
> > > > > effect sensor output.
> > > > >
> > > > > Weak spark, usually means weak input current to the
> coil.
> > > Or
> > > > > high resistance
> > > > > in the coil.
> > > > > You have changed the coil, so that leaves weak input
> > > current
> > > > > to the
> > > > > coil(primary current).
> > > > >
> > > > > Hall effect sensor works like a light switch .
> > > .on-off-on-off
> > > > >
> > > > > The tail end of the Ign ctrl unit is basically a
> relay, it
> > > is
> > > > > activated by
> > > > > the Hall effect sensor and it shuts on and off 12V
> power
> > > to
> > > > > the Coil.
> > > > >
> > > > > I've heard guys talk about turbocharged cars having a
> > > timing
> > > > > reference on
> > > > > the flywheel. I think when the engine is starting, the
> ign
> > > crt
> > > > > unit uses
> > > > > this to control the ign coil. After the engine starts,
> > > control
> > > > > is given to
> > > > > the Hall effect sensor. Not sure about this function.
> > > > >
> > > > > Hope I gave you some leads to follow up on.
> > > > >
> > > > > SJ
> > > > > 85 Dodge PU, D-250, 318, auto
> > > > > 85 Audi 4k - - sold but still on the road
> > > > > 88 Audi 5kq
> > > > > 90 Audi 100q
> > > > >
> > > > >
> > > > >
> > > >
> > > >
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