C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Service Engine Soon light

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Old Sep 30, 2014 | 10:15 PM
  #1  
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wilroy
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From: LaFollette Tennessee
Default Service Engine Soon light

Service engine light stopped working. now engine turns over but no start. Whats up with that?
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Old Oct 1, 2014 | 12:32 AM
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What year is the car? It does make a difference.

The SES light is controlled by the ECM. Do you have power to the ECM?

The ECM also controls the fuel pump. Does it run for 2 seconds when you first turn on the ignition?

There are a lot more questions that need to be answered. Answer these first and we can go on from there.
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Old Oct 2, 2014 | 05:08 PM
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wilroy
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Default Thanx

I have an 86 coupe. And I have power to ecm. Grounded pin a to pin g. Can hear fuel pump running.
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Old Oct 3, 2014 | 02:26 AM
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Cliff Harris
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Does the SES light come on if you turn on the ignition but don't start the engine?

Pin G supplies voltage to the fuel pump. You put 12 volts in there, not ground.

The ECM turns on the fuel pump, so the ECM is probably OK.
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Old Oct 4, 2014 | 08:16 PM
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Got another ecm from an 86 camaro. Same problem but now have ses light. After checking connections again the engine roared to life. I have to wiggle wires on each start. After she starts all systems are good and she runs smoothly. I might have a gremlin in it.
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