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The ECM generally works or doesn't.
But signs you have one going are hard to diagnose. But some I have seen:
- Values that are set by the software and change small amounts constantly freeze
- Loss of signal from a sensor but the sensor and wiring check out
- Intermitant limpin or shut down with out code set or check engine light
The problem with this list is that every symptom is more likely caused by an external source.
What else can I help you with?
What are signs of bad ecm computer on1990 Chevy?
There are a number of signs that become apparent when an ECM computer on a 1990 Chevy is going bad. The top signs include a non-functioning speedometer and flashing codes on the dash.
What are symptoms of a bad transmission control module?
Some of the top signs of a transmission issue would be that the car isn't switching gears or it is noisy when in neutral. Other signs would be that their is a bad smell.
What are the signs that your transmission computer is going bad?
A bad computer could cause several problems. The car may not shift properly. The overdrive might not work. In some models the transmission may stay in forward gears no matter what the selector is set to.
What would cause tbi injectors to stay open and spray fuel but not pulse?
A bad ingnition module, Are a bad computer.
What are symptoms of bad alternator?
There are several signs that an alternator is going bad. A few signs are dim lights, smell, warning lights, and a dead battery.
What are the signs of a transmission filter going bad?
some of the classic signs of a tranny going bad is leaking, slipping in and out of gear delayed starts from a stop where the car raises rpms before it takes off and shaking or jerking when its going into gear
1992 Chevy Camaro RS 3.1L fuel injectors not working?
it is probably a bad ignition module or computer
What causes no start when fuel and spark are present?
Ignition module, cam senor, crank sensor or bad computer
Is there such a thing as engine control computer going bad and only 3 cylinders are working?
The engine control module can affect cylinders. But if its only a 4 cylinder, cancelling out just one out of 4 isn't likely to be a computer. Its not the most likely cause, but it is definetely possible.
Why does my 1989 Chevy 350 ignition module keep going bad?
If you're not using a heat sink grease between the module and the mount area try using some on your next replacement module.
How do you know if your computer's BIOS is going bad?
You go to wiki.answers.com
What are the signs of a Thermostat going bad on a 1997 Pontiac Sunfire?
less heat in your car
