1996 Subaru Legacy Won't Start - Engine


Question: Hi: I've had this problem 6 times in the last month. When I try to restart after short trips of only a couple of miles, my Subaru ('96 2.2 ) cranks fine but won't start. I let it sit a few minutes and it starts fine. Happened today, and I plulled one wire from the coil to see if I had spark and bingo, it started and runs great after replacing the wire. So that told me nothing. Can't put up with this off and on problem. I'm afraid my wife will get stranded. I tried new plugs, wires, and fuel filter. My mechanic hinted towards the crank sensor, but can't be certain since there are no codes, and of course the problem never happens for him. Thanks alot, Bill


 
Technican: The very best chance you'll get is to catch the condition present long enough to monitor the sensors (with a scanner) for their output values. Should the crankshaft sensor show to be good but there is no spark you can look toward the Ignition Control Module (ICM) or pehaps an ignition coil. Do you have a friend who has access to a scanner? Are there VO-TECH programs in your area that have automotive teaching programs who might help? Many body shops have scanners too. Anyone in that area?
Owner: : That's basically what I was thinking too. Do you have any other things I should try if the crank sensor doesn't solve the problem? I may need to try other solutions.
Technican: Hello, A crank sensor typically can "drop out" intermittanly from radiant heat. After it cools down it may work again and allow the engine to start. They do not always set a code for this behavior. It would be your good fortune to be able to monitor the sensor with a good diagnostic scanner connected when the condition is present. Some owners opt to have the sensor replaced (as an educated guess) based on experiences mechanics have had with other cars. If you find the sensor both affordable and accessable for a "try" you need only to decide your willingness to gamble. Of course the best way is to duplicate the complaint/condition and determine the fault using a scanner to eliminate a guess.
Technican: Hello, May I hear from you concerning the status of this question, please?

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