Question about 1998 Isuzu Trooper

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No start but cranks, where should I check has fuel and compression, no spark?

Getting fuel and has good compression no spark from plugs. Could all coil overs be bad? Could it be bad crank sensor or bad alternator?

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  • Isuzu Master
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Coil on plugs? not that. Crank sensor? could be, but check the wires also. They break close to the plug.

Posted on Mar 27, 2015

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If it cranks good but won't start, and it doesn't make any horrible noises when cranking, like internal engine issues, have a helper crank it while you visually check for spark at the spark plugs. If you have spark everywhere, use a gage and check fuel pressure.

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1 Answer

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Check gas and spark. Check if fuel pump is still working. Do you have fuel pressure? Or can you check the fuel pressure? With key on, the pump should have put fuel under pressure in the lines and up to the injectors.
Check ignition system by checking for spark at one of the spark plug wires, with the engine cranking over. You need to see a blue, snapping spark to know the ignition system is good. If no spark on one wire, check another or all of them. If no spark, and no trouble codes-could be a bad crank position sensor. This sensor helps the computer calculate the timing of the spark, the main sensor the computer uses to signal for spark. It signals to the ignition control module (which controls the coils and the primary current to the coils ((the coils-where high voltage is created to cause spark at the plug)) ). So no spark? Could be a bad crank sensor...or a bad ignition control module...
If you have a single coil and not a coil pack, you might want to test that coil, but if shut down while driving, sounds like computer related, so check ignition controls: that would be crank sensor or ignition control module, or in worst case a bad PCM.

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1 Answer

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1 Answer

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In this case, if the timing belt is damaged, you might not have compression or spark at the right time.
A faulty crank or cam sensor could cause you not to have spark at the right time.
The spark plugs could be worn out or fuel fouled and not able to fire under compression.
Did the car die or just not start ?

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