Re: Ignition Switch Test followup - Saab 900 Bulletin Board - Saabnet.com
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Have you done compression and leakdown tests? Those help rule out mechanical problems.
Are you losing any coolant? Water in the cylinders give long crank times.
When it cranks for a long time, does it run rough or smoothly when it catches?
The fuel pressure gauge rules fuel out- it's an excellent test that few use.
I'd start by assuming it's electrical, since it's intermittent:
figure out a way to confirm primary ignition current. It can be tricky
because it's higher than 12v. Ideally, what you want is a light that blinks every
time the coil fires.
Put the same sort of light on the injectors. They call them 'noid' lights.
One is probably enough. Same idea as the coil.
You'll get a baseline idea of how things blink when the car starts normally,
so that when it doesn't, you can tell what's different.
The problem is that there are quite a few variables, from the rather likely
(e.g.bad primary coil wire, bad connection to the ECT sensor)
to the expensive (ecu) to the truly unusual (distributor timing sensor)
so ruling out entire systems is by far the easiest way to solve this
cheaply and quickly.
what do you mean, the engine's in backwards?
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