I have a 1989 corvette. The car will start up fine if the vehicle is cold. After the vehicle starts to get warm, it will start breaking down and missing, then it will shut off. You have to wait until it cools down before it will restart. Replaced pick up coil, tested distributor module repeatedly and it never failed. Any suggestions?
I will try ohming the injectors when i get home. Is it possible that a distributor module would act differently while driving? Meaning....Is it possible that even though it tested fine at Auto Zone, that it could act differently while installed on a vehicle?
Im not guaranteeing this is your problem. My best guess would be this (dizz module) if its dying when getting hot.
That part breaks down when it gets hot.
try a 'known good' module (junkyard low $ or brandy-new big $) and if problem remains carry the 'old' one as a spare, module failure is common...'heat transfer grease' is MANDATORY for module longevity, in an emergency even vaseline or 'chassis grease' will probly get you home, but the 'real' goo is best (get 'goo' from any auto parts store or raddyshack)...if you hunt a j-y module, late '80's caddys use the same module as vettes, grab the caddy tin shield over the module and add it to your vette for EMI shielding upgrade.
my second best GUESS is a sick o2 sensor...if your existing o2 sensor is more than a couple of years old, a new sensor is a good investment for top engine ops anyhow, but ez to watch the o2 sensor voltage while engine runs using a scanner...voltage should continuously vary above/below o.5v, bad ones will most often read 'something' at cold start, then hang at o.2v or less as engine warms...shorted wire or corroded connector typ s near/at 0.0v immediately on startup...if changing an o2 sensor, most unscrew much better when too hot to touch, NEVER use excessive force as the threads in the pipe/manifold may be ripped out...let things cool off and use anti-sieze when installing another o2 sensor (new sensors typically come already coated with anti-sieze)