ECM fault?

[Shannen Durphey]

David Cooley wrote:
> 
> At 01:29 PM 11/10/1999 -0500, Akselrud, Boris wrote:
> 
> >I am greatful for everybody's input.
> >
> >PS: Idle fluctuation is about 50..80 RPM, but when it falls it is causing
> >roughness and shaking the whole body.
> 
Also, not in the manual but often good for a situation like this is to
increase the minimum air setting.  But the vibration might be normal
and the engine mounts worn, or the exhaust is hitting the frame,
or....
Shannen
Sheesh, just spent two days chasing bad camshaft (2 intake + 1 exhaust
lobe weak) + intake gasket leaking between egr and #6 cyl + wrong air
horn gasket in Q jet + wrong return spring under acelerator pump +
fouled plugs + coil mounting screws broken through bottom of cap +
carbon tracking on rotor, without a scope or vacuum gauge.  The car
owner doesn't want to spend any money on it.  There's a CSH here for
someone.
Shannen

> Ah..  if the idle is dropping a bit and the engine is starting to shake/get
> rough when it does, then I would suspect ignition.  I can't remember the
> year, but if it has a distributor, pull the rotor and look underneath.  HEI
> has a way of burning through the center of the rotor and causing misfires,
> also, the cap could have "carbon tracking", ie: a bit of a burnt spot where
> the electricity can follow to ground instead of the plug wire.  Plug wires
> themselves... if the boots at the plug end are dirty, it could be arcing
> out the boot to ground causing the particular cylinder to misfire.
> Could also be the ignition coil breaking down internally, if it has a
> distributor, the shaft bushings could be worn causing the pickup/reluctor
> to vary in spacing/timing, if it's distributorless, the cam and/or crank
> sensor could be intermittent as well.
> ===========================================================
> David Cooley N5XMT Internet: N5XMT at bellsouth.net
> Packet: N5XMT at KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
> We are Borg... Prepare to be assimilated!
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