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post #1 of 8 (permalink) Old 10-02-2011, 06:36 PM Thread Starter
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SC ignition question

I've got an ignition problem with my '89 SC... I went through right when I bought it last December and put in new plug wires, coil pack and plugs. Earlier this summer the car started jerking violently like the ignition was cutting out. Whenever it would jerk, the tach also drops off and is non-operational there's really no pattern to it but it won't happen on a cold engine. Sometimes it'll continue for 3-4 minutes, sometimes I'll take the car out and it won't do it at all.
I replaced the ignition control module yesterday but the problem is still there.

Has anyone ever experienced symptoms like this?



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post #2 of 8 (permalink) Old 10-02-2011, 06:41 PM
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Could be the camshaft or crankshaft sensor going bad, Just a thought .

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post #3 of 8 (permalink) Old 10-02-2011, 11:08 PM Thread Starter
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Ran to Autozone and grabbed a cam position sensor. Swapped it out and went for a drive, got it up to temp and the problem never showed up.
Thanks for the suggestion Thunder Checken!



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post #4 of 8 (permalink) Old 06-21-2013, 11:47 AM
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I have a similar problem, It jerked badly and died once, jerked badly again and now its cut out and wont start at all. I remember seing the Crank pulley wobbling at idle back when it ran so i beleive it is the CKP sensor. I have disasembled the CMP and everything looks fine even new. have not checked the DIS.

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post #5 of 8 (permalink) Old 06-21-2013, 12:40 PM
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Originally Posted by Josh52894 View Post
I have a similar problem, It jerked badly and died once, jerked badly again and now its cut out and wont start at all. I remember seing the Crank pulley wobbling at idle back when it ran so i beleive it is the CKP sensor. I have disasembled the CMP and everything looks fine even new. have not checked the DIS.
May not actually be the CKP sensor - the crank pulley wobbling means the dampener has failed. It's time to buy a BJP (?) balancer, and while it's off, go ahead and replace the CKP sensor in case the failing balancer damaged it.

But the key note is, you'll need a new balancer.

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post #6 of 8 (permalink) Old 06-21-2013, 01:09 PM
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Quote:
Originally Posted by Josh52894 View Post
I have a similar problem, It jerked badly and died once, jerked badly again and now its cut out and wont start at all. I remember seing the Crank pulley wobbling at idle back when it ran so i beleive it is the CKP sensor. I have disasembled the CMP and everything looks fine even new. have not checked the DIS.
Yup, wobbling crank pulley means the balancer failed. The replacement one to get is made by BHJ. If the car won't start at all, the failing balancer probably damaged the crank sensor, so replace that at the same time. Also the factory balancer and crank pulley are matched and neutral balanced together. The BHJ will be neutral balance on its own, and if the crank pulley itself is out of balance, it could cause damage to your engine, so you will need to at the very least have the crank pulley checked for neutral balance, or now would be a good time to order a set of underdrive pulleys and install them at the same time.

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post #7 of 8 (permalink) Old 06-23-2013, 08:46 AM
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fyi if you keep running it the ballance bolt WILL break off in the crank,i know for a fact.Been there.
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post #8 of 8 (permalink) Old 11-08-2013, 12:43 PM
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im through it now, I went stock replacement crank pully and balencer because I didnt have a place to stay and couldnt get anything ordered online. oh well.... the pully vibrates ever so slightly and makes me nervous but at least if it breaks this time I will have the opurtunity to upgrade. as i could see that was the cars second balencer done with an unmatched pully.

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