[Diy_efi] 928/749

b.shaw at comcast.net b.shaw
Tue Aug 21 15:15:31 UTC 2007


Interesting....  There are a pair of grounds in teh injector harness on the passanger's side head but no grounds on the driver's side,  which is where I'm having the trouble.  That's definately worth a shot.

Bill

 -------------- Original message ----------------------
From: <don.broadus at exeloncorp.com>
> I read in circle track awhile back that it helps to ground the cylinder heads to 
> the block or battery with a good ground strap. The head bolts going into the 
> block having thread sealant on them don't give a good ground for the plugs. 
> 
>  
> 
> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
> Behalf Of Gregg Eshelman
> Sent: Tuesday, August 21, 2007 1:45 AM
> To: diy_efi at diy-efi.org
> Subject: Re: [Diy_efi] 928/749
> 
> 
> --- Bill Shaw <b.shaw at comcast.net> wrote:
> 
> > Well,  a new coil helped some but didn't cure the
> > problem.  It will 
> > start and run now but is still dropping spark
> > intermittently in a couple 
> > of cylinders.  The pulses from the ignition module
> > to fire the coil are 
> > nice and steady,  don't miss a beat.  Using the
> > timing light on a couple 
> > of the plug wires shows erratic firing. It's
> > starting to look like 
> > something in the distributor now,  but I can't
> > imagine what.
> 
> How many miles on the car? Could be worn bearings or
> bushings in the distributor or a worn shaft or
> possibly even the drive gear.
> 
> With the cap and rotor off, you shouldn't be able to
> move the shaft up and down or rotate it more than a
> tiny amount. Try wobbling it sideways too.
> 
> 
>        
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