Check engine light flash on and off what do I need to do
You can pull the check engine codes codes with out going to a shop. You need to short your Assembly Line Diagnostic Link (ALDL) with a paper clip or jumper wire. Find your ALDL; it should be a black connector, with 12 holes, in the passenger compartment, under the dash. There is raised notch that signifies the top of the connector (the connector may be upside down). With the connector right side up, insert a paper clip, or jumper wire, into the last two holes on the right side of the top row. Turn the ignition to the run position, but DO NOT START the car. The check engine light will begin to flash. It will flash several times to signify the first digit of a two digit code. It will then pause and flash several more times to indicate the final digit. The first code that will come out is 12 (1 flash followed by a pause and two more flashes), this code is no tach pulse (no engine RPM), and since the engine will not be on you can ignore it.
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Go to a local auto store like Auto Zone and they will read them for free...
A flashing check engine light means that the engine is misfiring and the catalytic converter is being damaged. If you have over 100,000 miles on it you're overdue for a tune up. Now on these engines this is where it gets "fun". To get the distributor cap and rotor (Opti-Spark) off, the water pump has to come off. To get the water pump off, the harmonic balancer must come off. So when you do your tune up, replace the water pump as well. Also, be sure to hook up the vacuum lines back up to the distributor cap. This keeps fresh air moving under the cap and prevents rust and corrosion from forming under the distributor cap. You can also pull the trouble codes out of the climate control system by turning the ignition on but don't start the engine. Turn the climate control system off. Then press and hold both the off and warmer buttons on the climate control panel. The trouble codes will then show up on the climate control panel temp display. This vehicle is OBD II. You cannot flash out the trouble codes as described above. Sorry. HTH. -Jim
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