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No Spark, Ignition Coils OK. 93 Chev Lumina
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creeze
New User
Jan 14, 2010, 11:39 AM
Post #1 of 4
(5571 views)
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No Spark, Ignition Coils OK. 93 Chev Lumina
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I have a 93 Chevrolet Lumina (3.1L V6), and I'm getting no spark. I checked the spark plug wires (the old screwdriver trick), and I got nothing. I checked the ignition coils (FREAKIN HEADACHE TO GET TO THOSE THINGS), with 3 different multimeters (one of them by a guy at O'Reilly's), and they all read fine, so it's not the coils. My car cranks but it won't start. Every now and then when I try to crank it, it just clicks, and it takes about 4 or 5 times to get it to crank again. The crank is healthy when it finally happens, the battery is fine as well, no loose connections there. What else could it be?
(This post was edited by creeze on Jan 14, 2010, 11:40 AM)
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Sidom
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/ Moderator
Jan 14, 2010, 11:52 AM
Post #2 of 4
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Re: No Spark, Ignition Coils OK. 93 Chev Lumina
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Sounds like you've got a couple of things going on. one being a bad starter. Spark should really be tested with a spark tester but you gotta work with what you got..... Depending on what tools you have, you should look at the crank sensor and make sure the module is getting a signal..... On thing you could check that I've seen go wrong before. The small two wire harness coming from the crank sensor going to the module will get oil in it and take the insulation off the wires & short out. Those wires are a twisted pair & need to be twisted for shielding. If you do any repairs to the harness make sure they get twisted..........
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creeze
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Jan 14, 2010, 12:33 PM
Post #3 of 4
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Re: No Spark, Ignition Coils OK. 93 Chev Lumina
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You sure it's a bad starter and not a short somewhere? Like I said, every few tries, it will crank, so it couldn't be completely bad. When it does crank, it's a really healthy crank. The crank sensor with the oil sounds possible, because my engine has a couple leaks (it's pretty messy in there, got it from someone who didn't take care of it at all). I'll take out my manual and see if I can find that. If there is oil, it's likely the module is already shorted and needs to be replaced, correct?
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Sidom
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Jan 14, 2010, 1:08 PM
Post #4 of 4
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Re: No Spark, Ignition Coils OK. 93 Chev Lumina
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With the starter it sounds like there is a dead spot. That is the classic sign, turn the key and nothing and then it starts. After it gets bad enough, then the starter need to get a rap on it before it will turn over. My data base is down at the moment so I'm going off memory but I believe that sensor is the 2 wire a/c pulse generator type. If it has 3 wires then it's a hall effect sensor with a supplied 5v reference. The wires shorting on a a/c type won't hurt the module. It's very low voltage but it does take out the signal. No signal, no start. It's very possible the module is bad, that was a common problem on those as well but 1st you have to make sure there is a good signal 1st. I use a scope to check the signal and really haven't used anything else. If someone has a good way of checking the signal integrity with a voltmeter or something else maybe they'll jump in. As far as the wires shorting, that is easy. Just take the loom off & look at the wires, if thats the problem it would obvious. Or even easier, disconnect the harness from the module & sensor, get an ohm meter & probe both ends of the connecter. It should read open, any continuity and the wires are shorted...........
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