Question about 1991 Oldsmobile Ninety Eight Regency

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What is making my engine start then die

All circuits checked. computer is shutting down injectors after engine starts

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Posted on Jan 02, 2017

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SOURCE: 99 olds alero no injector pulse. ignation module

Check your throttle position sensor if it is bad and reading wide open it might be cutting out the injector.

Posted on Sep 22, 2010

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Fuel injectors not working


Check voltage at the injectors with key on. Voltage should always be available to injectors with key on. When the ecu grounds the injector circuit internally, for a split second, the injector will pulse, spraying fuel. You can buy a "noid" light to test injector circuit, one that fits your injector connector. To test, you crank the engine over, noid light should be blinking.
Or, use a test light and check injector drive circuit. With key on, one injector terminal should have constant battery voltage-test light should be lit bright. Now move ground clip of test light to the POSITIVE battery post, and probe the other injector terminal, the one that did not light the test light. Have someone crank the engine-if injector circuit is working, the test light will be blinking, indicating the ecu is grounding the injector circuit.
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Still need an answer to why my 98 explorer wont start ,started just fine 3 minutes prior spins but no start get spark compression fuel but no start if i wait a day or two it almost starts but dies qi


Check if the injectors are pulsing when cranking the engine over. Listen for the tick, or feel for the pulse with your fingertips, or buy a cheap "noid light"-an injector circuit tester- one that fits your injector harness connectors-plug it into an injector connector and crank the car. If circuit is working the noid light will be flashing.
Some anti-theft systems immobilize the injector circuit when they are activated. So you have spark, compression, and fuel to the engine, check the injector circuit.

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1 Answer

I have a 1991 Oldsmobile Cutlass Ciera the car starts right up then dies immediately, it has 41 lbs at the fuel rail and obvious spark. it shows no trouble codes on the scan tool but shows communication...


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Hi, i recently had my transmission replaced on my 94 cadillac deville, and now my car will not crank. It had been sitting for about a year after it broke down. i chked to make sure the fuel pump is working...


first check that all the battery connections are clean and tight, also check to see if it starts in neutral. Play with the gear shift lever,pulling up or down the neutral safety switch may be out of adjustment If you need more help get back to me. Thanks Ray

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check on the wires to the automatic shut down relay are not shorting and also check out the Start relay circuit.

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That sounds like a bad grounding wire, or possible PCM malfunction. Check all engine wiring harness locations for any corrosion or damage. let me know what engine type you have, and I could look up the wiring schematics

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