[urq] Ideas for rough running continued - Solved?

[Ingo Rautenberg]

For Ed,

Frank de Kat sent me this:

----- Original Message ----- 
From: "Frank de Kat" <fdekat at sentex.net>
To: "Ingo Rautenberg" <i.rautenberg at waratap.com>
Sent: Thursday, April 07, 2005 6:32 PM
Subject: Re: [urq] Ideas for rough running continued - Solved?


> Hello Ingo:
>
> At 04:35 PM 4/7/05, you wrote:
>
> >Ah, but it all depends on whether the car is in gear, no?
>
>
> I beg to disagree (But I  think I see what you are getting at!)
>
> >If the tach drops
> >to zero and the car dies one can assume it's either fuel or ignition.
>
> Noo... Tach will only go "all the way to zero" if there's an electrical
> problem.
>
> But I may see the crux of your logic:  IF the motor is already going very
> slow (idle), and the fuel cuts out, the tach will get pretty close to
zero,
> and still be doing it's job (As the motor IS truly going pretty slow!) and
> be hard to tell it it's AT zero, or NEAR zero..
>
> So.. Perhaps to help:
>
> In my experience, if it's an  electrical problem and ign cuts out, the
tach
> will go RIGHT to zero, and perhaps violently bounce back to indicated revs
> when the ignition returns. Maybe a good backfire too, as the ignition come
> back on. (In my case, it was a VERY good backfire!)
>
> I'd think if it was a fueling problem, the tach MAY get close to zero, and
> only rise in revs again when the motor catches again.
>
> It would really help to absolutely verify where the fundamental problem
is.
>
> Perhaps attach a timing light to see if spark is going away when it dies,
> vs. fuel?
>
>
> >  If
> >the tach drops to zero and the car is in gear, then definitely an
electrical
> >problem.
>
> Agreed.
>
> >   I'm sorry if I didn't make that clear.  My problem would be it
> >would run like crap (stalling), I'd depress the clutch and engine would
die.
>
>  From whatever the problem was/is, I's assume.
>
> No matter how you slice it though, running a urq is never boring...
>
> Good luck!
>
>
> Frank de Kat
> fdekat at sentex.net
> Dundas, Ontario, Canada
>
> http://www.sentex.net/~fdekat
> (To see the "Rally Pictures")
>
>


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