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electronic ignition system

You will need to have the engine ignition spark checked to see if there is spark when it stalls and will not start. The most common cause is oil leaking into the distributor and shorting out the igniter and coil...

There is a number of tests that would need to be done on this vehicle to narrow the problem down to an ignition, computer or fuel system problem. Have a mechanic like one from YourMechanic come and test the computer...

If you are getting fuel pressure then you may not be getting spark. This is usually caused by the distributor module and coil. You should check for spark at spark plugs and if not then replace distributor.

There is a possibility that a coil can fail close to the same time as each other but not likely. The computer will set a code for each failed coil or cylinder. If a different coil fails then you will...

Hi - GM V8 ignition control modules from 1987 to 1995 should interchange with your '91 5.7L. For assistance, I recommend a ignition control module replacement (https://www.yourmechanic.com/services/ignition-ignitor-replacement) performed by a mobile, professional mechanic, such as one from YourMechanic, who will...

There are many causes of hard starting but illustrative ones are a faulty engine coolant temperature switch (sensor), worn spark plugs, inadequate fuel delivery or pressure (caused by other than fuel filter in your case), and contaminated or old gasoline....

The engine ignition system should be checked for misfires and fouled spark plugs and shorting plug wires. Have the engine computer scanned for any stored codes for the MAP sensor on the engine intake. These are know to fail and...

Prior to performing diagnostics be sure you have a fully charged battery that passes a load test (https://www.yourmechanic.com/services/battery-is-dead-inspection). Then, confirm that the engine immobilizer system (security system) is not activated thus preventing the car from starting. Basically, if a fully...

Hi there. The distributor rotor should face the number one on the distributor with the number one cylinder on the compression stroke with both the rocker arms for the intake and exhaust valves shut. The back of the distributor has...

In order to isolate the problem you should have the fuel pressure monitored with a pressure gauge hooked up to the fuel rail. As the engine is running monitor fuel pressure when it stalls out to see if pressure drops...

Hi There, This may be related to many different possibilities that may be contributing to a lack of spark. Things like ignition coils, crankshaft position sensor, spark plugs, spark plug wires or ignition module are all components that help to...

The most common cause of the engine crank no start (https://www.yourmechanic.com/services/car-is-not-starting-inspection) is loss of ignition spark from the ignition system. The distributor is known to have internal shaft oil leaks that will short out the internal cam and crankshaft sensors...

You have a problem with the distributor assembly. I recommend replacing the distributor assembly. This will replace all the possible sensors and coil for the ignition and fix the problem you have.

The engine is very common to have an intermittent cam or crankshaft sensor. You can have the computer scanned for codes to one of the sensors and replace them as codes are stored. If you have codes for both then...

The problem sounds like you may be losing spark signal to the ignition system. When the engine will not start you need to verify you are losing spark. If it is then you most likely have a failed ignition module...

Hi there - the fact that the vehicle has this stumbling problem (https://www.yourmechanic.com/question/hesitation-stumble-and-lack-of-power-at-low-rooms-and-speeds-by-michael-w) at the same speed (more or less) repeatedly suggests things that are dependent on that speed. These include the torque converter locking up (or trying to), or...

Your vehicle is equipped with a crankshaft position sensor (https://www.yourmechanic.com/services/crankshaft-position-sensor-replacement). That sensor is on the primary side of the ignition circuit and consequently you should test the sensor and all wiring to the distributor to be sure it is functioning....

Prior to performing diagnostics be sure you have a fully charged battery that passes a load test (https://www.yourmechanic.com/services/battery-is-dead-inspection). Then, confirm that the engine immobilizer system (security system) is not activated thus preventing the car from starting. Basically, if a fully...

Hello. It sounds like you have a fuel system issue. If the vehicle was running with bad fuel in it then that fuel may have caused the fuel pump to fail or it may have clogged the fuel filter or...

Hello. A no spark condition can be caused by a wide variety of issues. If the issues appear to be affecting an entire bank, that is an entire side of the engine, then it may be possible that there is...