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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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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Z28 LT1. Why do fuel injectors shut off?

it could be a wiring problem in the circuit or the injectors have a resistance problem or maybe even the injector drivers in the computer have a problem or are bad.

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2002 dodge ram 1500 4x4 4.7l Turns over but won't start put gas in the throttle body an it will start but shut right off getting gas to fuel rail An power to the injectors

It doesnt sound like you have sufficient fuel pressure can you hear the pump run? if so might be a pressure issue, if not probably pump

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After hot engine wont start and smells like gas

Most likely causes are bad engine coolant temp sensor OR leaking fuel injectors. Bad engine coolant temp sensor will give computer false reading and computer provides wrong air fuel mixture. Leaking fuel injectors will load the engine with raw gas--just like flooding it. Try pushing the gas pedal to the floor and holding it there when cranking when hot. That forces the computer into "clear flood" mode and it shuts off the injectors. If it starts up with pedal down, that would be a sign of leaking injectors.

Jul 21, 2017 | 1999 Dodge Intrepid

1 Answer

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.
If no voltage to injectors, the drive circuit and wiring needs checked. If no ground signal, the wiring and the ecu needs checked.

Jul 07, 2013 | Toyota Cars & Trucks

1 Answer

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.

Dec 01, 2012 | Cars & Trucks

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...

The ECM on this car will shut down the injector driver circuit if one of the six injectors has a coil out of tolerance. (Shorted coil or resistance out of parameters) Quick check. Unplug two wire cap to injector one at a time. (hold/push wire clip inwards then gently wiggle/lift cap off---careful with wires) With one unplugged try starting. If no start- plug back and use same procedure on next injector and so on.........In most cases if bad injector coil the engine will start when it is located. Replace injector. Some say the ECM shuts dirver circuit down to prevent further damage to switching circuit.

Apr 12, 2011 | 1991 Oldsmobile Cutlass Ciera

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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

Feb 27, 2011 | Cadillac DeVille Cars & Trucks

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No start no injector pulse no spark,Has new crank cam sensor and a computer,all wires have good continuaty

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

May 28, 2010 | 1991 Dodge Dynasty

1 Answer

Jeep will just die going down doad or will not start, had a code that read camchaft sensor replaced that still the same, now i have a code that reads injector circuit malfunction i mhave changed fuel

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

Apr 25, 2009 | 2000 Jeep Grand Cherokee

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