My 1997 4.6 bird was fine last night,today:no spark. - TCCoA Forums
 
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post #1 of 7 (permalink) Old 01-22-2011, 02:40 PM Thread Starter
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My 1997 4.6 bird was fine last night,today:no spark.

I have been trying to start the car this morning with no success. The engine turns over without any firings.The pump runs and fuel sprays from the schraeder valve quite well. I pulled one plug wire from the coil,possitioned it over the terminal,and when cranking the engine,there's no spark. What are the possible problems? The ignition switch has never ever acted up, but could there be something there? How about the crank position sensor? Any other possibilities? thanks, edman
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post #2 of 7 (permalink) Old 01-22-2011, 03:17 PM
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I'd check the crank sensor. It's by the a/c compressor; unhook the harness and plug it back in, it's possible the connection is just corroded/loose.

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post #3 of 7 (permalink) Old 01-22-2011, 03:35 PM Thread Starter
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1997 no ignition.

My car's parked in front of my house along the curb, so I will have to jack it up pretty high to pull and reconnect the terminal,but I will do it by day's end. The engine has been leaking a little from the front seals for years, and there's a good coating of oil/grime over the lower end,including the sensor and terminal. Would a faulty sensor or bad connection set a code? Is this the only thing that would cause a lack of spark? If not, what else would? thanks , edman
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post #4 of 7 (permalink) Old 01-22-2011, 04:51 PM
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I had the same issue, cleaned the connector and it took care of it.

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post #5 of 7 (permalink) Old 01-23-2011, 12:47 AM
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The crank sensor is the only sensor on the car that could cause a no-spark condition. The wires are twisted pair and shielded, and often times the insulation near the connector wears away and the wires short to each other (because they are twisted).

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post #6 of 7 (permalink) Old 02-10-2011, 11:29 PM Thread Starter
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I pressure washed the crank sensor,now this. . .

I was going to crawl under and look at the sensor's connection,so I cleaned it first.Just for fun,I got in and tried starting it.It started right up.I drove around,and it re-started just fine too.This worked for seveal weeks until today! Now it cranks well,the tach does not move as it cranks,and it won't start (exactly as the original symptoms).In the last few days,I had to jiggle the key in the ignition before it would start.So now, yes I will pull the leads of the crank sensor,clean and inspect them,and re-attach too. But,if this does nothing,then is the ignition lock a source of no spark,even though it runs the starter? Or, is it just the T-bird Curse? By the way, three years ago, my "no-start" problem at that time was a multi-wire short in the actual under hood harness. It was corrected by separating them out, re-insulating them (three wires), and then carefully wrapping them away from the others.At that time,the fans would come on when the ignition switch was turned,but with a no start condition.Hand jiggling the harness with the key on would suddenly cause the starter to run and engine to fire.Your forum alerted me to possible harness shorts,which was repaired.And this cannot be "it" again?
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post #7 of 7 (permalink) Old 02-10-2011, 11:51 PM
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If the SES light goes out when you turn the key to START, then the PCM is receiving the start signal and you can rule out the ignition switch.

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