Autolites cracking - Page 6 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-16-2006, 12:05 PM   #51
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The whole thing is rather strange. I wouldn't expect those temperatures to crack the plugs. Are there any other issues that may be involved that may be getting the exhaust manifold'* temperature a lot higher than normal?
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Old 05-16-2006, 12:16 PM   #52
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Before reading this post from me..understand this is total speculation and I'm putting it out there for ideas only.

Thinking more and more about this..... the plugs are cracking in this car too consistently to be a fluke. We haven't seen others with this type of issue, with this consistency.

I'm starting to wonder..if voltage through the plug wire is too high or too low...could that heat up and crack the plugs?

Say either battery/battery cable or coils/icm somewhere has an issue and is off.
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Old 05-16-2006, 12:33 PM   #53
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Quote:
Originally Posted by BillBoost37
Before reading this post from me..understand this is total speculation and I'm putting it out there for ideas only.

Thinking more and more about this..... the plugs are cracking in this car too consistently to be a fluke. We haven't seen others with this type of issue, with this consistency.

I'm starting to wonder..if voltage through the plug wire is too high or too low...could that heat up and crack the plugs?

Say either battery/battery cable or coils/icm somewhere has an issue and is off.
After seeing the condition of the wires this weekend, I have been considering them as a cause as well, although I'm not sure what they could be doing to cause this. I haven't had any electrical issues for a few months (turned out to be a bad postive battery terminal connection) that would indicate a charging system problem. If there were, I would expect voltage spikes and blown fuses. I'm not ruling it out, I just don't know where to look for the gremlin off the top of my head.

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The whole thing is rather strange. I wouldn't expect those temperatures to crack the plugs. Are there any other issues that may be involved that may be getting the exhaust manifold'* temperature a lot higher than normal?
A clogged cat could cause the manifolds to overheat, but I have seen no signs of that from the computer, emissions tests, or any running issues that might indicate a bad cat. I have also never seen the manifolds glow red as would be expected if they were hot enough to cause damage.
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Old 05-16-2006, 01:49 PM   #54
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Having recently run some electrical gremlins out of my car..I can say. It'* not that bad to follow the battery cables and clean all the ends and connections. That'* step 1.
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Old 05-16-2006, 03:32 PM   #55
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I tried to find a similar thread over at CGP about one guy having the same problem. The problem was supposed to be cured when the plug wires were replaced.
I hate it when I canít find something that was there earlier.


Her is what I got.
http://www.clubgp.com/newforum/tm.as...de=&*=#3051569

Maybe it was over at the Regal forum I donít know but I wish I could find it. Gurr

If you are good with SEARCH please see if you can find that old post.
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Old 05-16-2006, 03:46 PM   #56
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Thanks Ron...glad to have more input. This is a stumper of a problem.
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Old 05-16-2006, 10:56 PM   #57
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This link is to a page showing the spark end of the plug, and what it means. Anything look similar to what you found with the plugs?

http://www.gnttype.org/techarea/engine/plugs.html

Other searches didn't find a lot. Here'* a good page on knocking and pinging, which can cause the plugs to crack.

http://www.cars.com/carsapp/usatoday...knockping.tmpl

The only other thing I could find was on using too hot of plug. The plugs would retain too much heat, and also lead to detonation, which would contribute again to the cracking.
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Old 05-18-2006, 01:19 AM   #58
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This is not the post I was looking for but it talks about plug wires and cracked porcelain.

http://www.clubgp.com/newforum/tm.as...heck=500070287
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Old 05-18-2006, 05:17 AM   #59
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Quote:
Originally Posted by Archon
This link is to a page showing the spark end of the plug, and what it means. Anything look similar to what you found with the plugs?

http://www.gnttype.org/techarea/engine/plugs.html

Other searches didn't find a lot. Here'* a good page on knocking and pinging, which can cause the plugs to crack.

http://www.cars.com/carsapp/usatoday...knockping.tmpl

The only other thing I could find was on using too hot of plug. The plugs would retain too much heat, and also lead to detonation, which would contribute again to the cracking.
Those pictures are all showing the business end of the plug. The cracks I am getting are on the insulator at the top of the plug. Detonation is a possibility though. I wonder if a properly located knock could shock the plug enough to crack the insulator near the wire. That combined with excess heat may do the trick.
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Old 05-18-2006, 05:23 AM   #60
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Quote:
Originally Posted by ron350
This is not the post I was looking for but it talks about plug wires and cracked porcelain.

http://www.clubgp.com/newforum/tm.as...heck=500070287
So a bad coil can cause this? That'* worth a look too, although my problem seems to be wandering around the engine. That guy had the same cylinder every time. And he could reproduce it on demand.
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