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weak or no spark sometimes
Topic Started: Sep 4 2012, 12:35 PM (615 Views)
aed3
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Hi I just joined the forum. I bought the car like this its a 98 metro lsi 1.3 the story is that the timing belt broke and was replaced and it wouldn't run so I bought it, the timing is right, it has fuel, compression is 150 on all 4. But It only has good spark sometimes on the 1,4 coil and a weak spark on 2,3 coil, sometimes it has no spark on either it also has a new 2,3 coil, cam and crank sensor and I have 2 computers for it, I just can't figure out why it only sparks sometimes . Thanks for any input. My name is andrew
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Woodie
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I suspect the crank sensor, does it have an oil pan gasket on it? If so, that's your problem, take it off and replace the oil pan with RTV only as a seal.
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aed3
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Ok ill check I don't think it has one but I hope it does cause that would solve a lot. Thanks and ill tell you if it does when I get home and can look at it
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Bad Bent
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Facetious Educated Donkey

What Woodie said and if you want to go looking for errant spark you can get some Windex as Jittney suggested and try this:


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Oddmodman


Hey did you ever figure this out? I'm having the same issue.
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2000Firefly1.3L
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try taking apart the plug towers attached to the coil #2 pack. unset the screw at the bootom of the coil, rough it with sandpaper and apply dielectric grease back on. rough all electrical contacts with sandpaper and grease. re-assemble. you can also measure the resistance of the secondary coil. measure from between

4) Measure secondary coil for resistance.
Secondary coil resistance (“a” – “b”):
11.1 – 15.0 kat 20C, 68F
If resistance is out of specification, replace ignition coil assembly.

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