Question about 1999 Jeep Cherokee

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No spark 155,000 miles. Running fine until "died" a few days ago. Mechanic says "no spark." Changed the distributor pick up; tested the coil - OK. Says it's the computer. Still waiting for a reman to be delivered. Is this the problem? Most other forums say it's the crankshaft sensor.

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The CPS (Crankshaft Position Sensor) is a common reason for no starts. Sometimes the connector loses its connection. I would unplug it, check for corrosion on the leads and plug it back in with dielectric grease.

The crankshaft position sensor is mounted to the transmission bellhousing at the left/rear side of engine block

Posted on Jun 13, 2008

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Before you replace the computer have the crank sensor replace it is located between transmission and engine by the driver's side on top of transmission
most likelly your computer is ok
the distribuitor has nothign to do with spark on this cars

Posted on Jun 02, 2008

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1 Answer

Starts fine one time and then refuses to start.


If this is a conversion from old points style to HEI modern style, the problem may be the resistance wire is still in the circuit, which should have been removed from the power circuit to the distributor.
If the ignition coil reads 12 volts to its 12 volts terminal, then you should replace the ignition module, furthermore, a pickup coil and sprocket can also be replaced from under the rotor but the distributor needs to be removed and disassembled to get to the pickup coil and sprocket. Some Fords don't need to be removed but do need some disassembling to replace all of its electrical components.

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Good morning! My 1990 Toyota Corolla 2 Door Sedan has been fine until the past 3 days. The car starts fine then several minutes after driving the car will die. I pull over on the side of the road, put it...


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1 Answer

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First thing is what condition are the distributor cap, ignition rotor, and spark plug wires in?

There is the possibility that the ignition coil located in the top of the distributor cap is faulty and first check to see if full battery voltage is even getting to the "Bat" or "Pos" (+) positive side of the ignition coil when the key is in the "Run" position. Then check the secondary resistance to the ignition coil.

The ignition module and the pick-up coil/stator located inside of the distributor is what generates the signal that the ECM (Engine Control Module) uses to time and fire the fuel injectors, as well as the signal to run the fuel pump and the dwell signal timing to fire the ignition coil. A faulty ignition module can cause any one of these systems to malfunction.

That does sound like a malfunction with the ignition module inside of the distributor, and you can remove the ignition module and have it tested for free at most auto part stores. If the ignition module does test out alright then the problem could still be in the pick-up coil/stator, (it can be tested using an ohm meter by dis-connecting the wire connector from the pick-up coil/stator and the ohm reading between the two wires from the pick-up coil/stator should be between 500 and 1500 ohm's, and both of the wires from the pick-up coil/stator should show an open loop or an infinite reading between each wire and ground) and if the pick-up coil/stator is found to be faulty then replace the entire distributor, or the distributor will have to be dis-assembled to install a new pick-up coil/stator.

If you do purchase a new ignition module be sure that it does come with a silicone grease or a die-electric compound because it is a heat sink and the ignition module will burn up without it.

To install the new ignition module first clean out the mounting surface inside of the distributor. Then completely coat the metal contact surface under the ignition module with a thick coat the silicone grease or die-electric compound and do not leave any of the metal contact surface of the ignition module un-coated with the silicone grease or die-electric compound, and be very careful not to over-tighten the ignition module or it will be damaged.

Let me know if you require any further assistance.


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