XJ XJ8 / XJR ( X308 ) 1997 - 2003

spark..but no injector pulse

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Old 06-28-2011, 08:48 AM
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Default spark..but no injector pulse

car sat all winter, charged the batt, car won't start.

Has fuel, has fuel pressure, has spark, noid light shows no injector pulse.

Only code is 1111.

Ran perfect when parked.
 
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Old 06-28-2011, 08:50 AM
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Car is a 98 xj8 with all updates.
 
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Old 06-28-2011, 11:45 AM
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Wes, I would be looking at the crankshaft position sensor and the associated wiring. It is possible that an animal got under the car and chewed on the wiring, leading to the failure of the sensor. This sensor tells the computer the position of the crankshaft and therefore the computer will know which injector to signal next to apply fuel to the correct cylinder. If you get under the car, locate the harmonic balancer on the front of the engine. Now, look just behind the balancer and you will see a small plastic piece sticking out the side of the block. This is the crankshaft sensor. Check the wiring in the area and you can test the sensor by removing it from the engine, connecting a multimeter across the 2 pins of the sensor and then passing a large screw driver near the end of the sensor. You should see the multimeter jump about 1-2 volts (depending on the size of the screw driver, how close the screw driver passes to the sensor, and how fast you move the screw driver). If you don't see the multimeter jump, then the sensor is bad.

You may want to also check to make sure that for some reason the fuse for the injectors is not failed. I don't have my schematics for your car with me, but I seem to recall that they do have a fuse. So, look around and hopefully some one else can help you out with the number of the fuse.

If you need more info, let me know. I will do what I can.
 
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Old 06-28-2011, 01:28 PM
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thanks, fuse is good. I didin't know how to test the crank sensor..I'll let you know how it goes.
 
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