[DMCForum] Re: Shakedown Breakdown (More ignition troubleshooting)

["cruznmd" <racuti1@xxxxxxxxxxxx>]

Ick. I hope not. The method to test the coil in the book is lame.

I know that the input voltage for the coil should be "low" as in 
lower than 12 volts, but I didn't think it should be as low as 6 or 7 
volts. Shows what I know. I forget what the manual calls out.

Rich


--- In DMCForum@xxxxxxxxxxxxxxx, "Scott Mueller" 
<scott.a.mueller@xxxx> wrote:
> It very well could be the Pulse Coil.  I do not know off hand how 
to test
> the pulse coil.
> 
> I had a '77 Mercury with electronic ignition on a 302.  The 
ignition module
> was mounted under the hood.  When the car was about 7 years old the 
module
> failed.  I was driving up through the central valley of CA to Reno 
in the
> summer.  Very hot out.  The car would start running rough then shut 
down.
> After about 30 minutes, you could start it back up and run for 
hours.   It
> turned out that the heat would cause the potting material to expand 
in a way
> that an internal connection would open.
> 
> Drove me nuts until I went to a Dealership in Reno and spoke with 
the parts
> counter man.  $300 later, problem was solved.
> 
> Scott Mueller 002981
> 
> 
> -----Original Message-----
> From: cruznmd [mailto:racuti1@xxxx] 
> Sent: Monday, August 02, 2004 8:39 AM
> To: DMCForum@xxxxxxxxxxxxxxx
> Subject: [DMCForum] Re: Shakedown Breakdown (More ignition 
troubleshooting)
> 
> 
> Good question. I have not measured it within the last few days, but 
> the last time I measured it, it was around 7 or 8 volts, which I 
know 
> is a bit low.
> 
> The one thing I don't want to hear, is that this is a pulse coil 
> problem. The dizzy is a pain in the ass to get at, and I have never 
> taken a Bosch dizzy apart. I don't think that's the problem though 
> becuase it's usually a "die, cool down, work, die again" symptom.
> 
> Rich A.
> 
> --- In DMCForum@xxxxxxxxxxxxxxx, "Dave Stragand" 
<dave.stragand@xxxx> 
> wrote:
> > What is the -voltage- at the coil?
> > 
> > -----Original Message-----
> > From: cruznmd [mailto:racuti1@xxxx]
> > Sent: Sunday, August 01, 2004 9:35 PM
> > To: DMCForum@xxxxxxxxxxxxxxx
> > Subject: [DMCForum] Shakedown Breakdown (More ignition 
> troubleshooting)
> > 
> > 
> > After advancing the timing back to 13 degrees, there was 
definitely
> > an improvement in performance, but still some small bit of the 
> > problem remains. I was even able to run the new coil with better 
> > results, but still the old, blue coil works better.
> > 
> > Two things of note:
> > 1. When the ballast resistor has been powered for a while and 
it's 
> > good and hot, the resistance increases. The lower one read .9 
ohms 
> > and the upper one read .7-.8 ohms. This is nearly double the 
rated 
> > value. I think it's breaking down and should be replaced.
> > 
> > 2. With my shiny, new timing light, I was able to observe the
> > different types of timing advance;
> > 
> > In accordance w/the manual, under vacuum advance, it has 3 steps
> and 
> > the timing incremented accordingly. I then removed the vacuum line
> > from the distributor and checked the centrifugal advance. It 
> > increments to the proper points at the proper RPM's as far as I 
can 
> > tell. It's hard to see the tach and read the timing at the same 
> time.
> > 
> > Under load, it's a different story. The car hesitates a bit when
> you 
> > pull away, as though the advance is sticking and when it "breaks
> > free", acceleration is smooth and steady.
> > 
> > Does this sound cracked or is it feasible?
> > 
> > Rich A.
> > #5335

Yahoo! Groups Sponsor

ADVERTISEMENT

---

Yahoo! Groups Links

• To visit your group on the web, go to:
  http://groups.yahoo.com/group/DMCForum/
   
• To unsubscribe from this group, send an email to:
  DMCForum-unsubscribe@xxxxxxxxxxxxxxx
   
• Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.