miss still happening

am018 am018 at post.almac.co.uk
Wed Sep 30 07:51:17 GMT 1998


A couple of things I have come accross in the past that caused hard to
track down missfires.
Check the main feeds at the back of the alternator --- these sometimes
cause bad voltage spikes that cause missfires with electronic systems.
Also check the plug lead routing -- separate the leads as much as possible.

Andrew F. Gunnesch wrote:

> Well, I guess I spoke too soon...  the miss is still there, though it
> doesn't happen nearly as often as it did before.  Perhaps the ignition
> module also has an intermittent loose connection in it?
>
> When the miss is happening on my '89 TPI motor (MAF, '165 ECM, remote
> coil distributor, VSS in the transmission), the speedometer jumps up
> quite a bit.  I'm thinking that it could be one of several things (I
> am getting a diacom today for testing to help eliminate possibilities):
>
> 1)  Intermittent loose connection in either the ignition module or
>     below the spot in the wiring harness that I spliced in (the 4-wire
>     connector to the distributor)
>
> 2)  Intermittent loose connection in either of the 2 wire connectors
>     on the coil
>
> 3)  bad ECM
>
> 4)  bad VSS buffer box
>
> 5)  crosstalk (induction, jumping spark, whatever) between one of the
>     ignition wires and one of the wires that controls the distributor/
>     coil operation
>
> Suggestions on how to proceed?  Thanks!
>




More information about the Diy_efi mailing list