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Old 09-08-2017, 05:22 PM   #41
OldNuc
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1998 SC2
Default Re: Spark plug ceramic tip broken in engine

You are burning a lot of oil in #3 and that should be investigated. How long ago was that engine rebuilt? Looking in there with a borescope would be a good idea. A compression test on #3 would be interesting.

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Old 09-08-2017, 05:37 PM   #42
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Default Re: Spark plug ceramic tip broken in engine

Quote:
Originally Posted by OldNuc View Post
You are burning a lot of oil in #3 and that should be investigated. How long ago was that engine rebuilt? Looking in there with a borescope would be a good idea. A compression test on #3 would be interesting.
Had this done to the engine about 3 1/2 years ago-----
Piston ring set (Piston ring set, Rod bearing set, main bearing set)
Bored upper cyl.
New oil, filter and air filter
Spark plugs
Anti-freeze
Thermostat
Timing chain set
Engine gasket set including head gasket
Head resurfaced, valve guide, seal

What could be done to correct this?

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Old 09-08-2017, 06:05 PM   #43
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Default Re: Spark plug ceramic tip broken in engine

Need to run a proper compression test, see below. Then get a look in there with a borescope.

*COMPRESSION TESTING*
To prevent washing the cylinders down with fuel remove the PCM B fuse to shut off the fuel pump, injectors, and ignition before starting the test. Remove all spark plugs and block the throttle open. Use a low charge rate battery charger to fully charge the battery before conducting the test.

Crank the engine until the gauge quits increasing and compare both the final pressure and number of compression strokes to reach the max pressure, cylinder to cylinder. You can do this test either cold or hot or warm just mention it when stating results.

For example if you find all cylinders produce a final reading of 200psi but the compression cycles are as follows: 1-8, 2-6, 3-8, 4-14 then it should be obvious that cylinder #4 has a serious problem with leakage past either the valves or compression rings.

FSM states the MINIMUM number of compression cycles is 10 and a Fully charged battery is required to obtain the full 250RPM cranking speed.

Nominal compression for a high mileage good condition DOHC is 190-220psi and SOHC is 175-205psi.

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Old 09-08-2017, 06:15 PM   #44
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Default Re: Spark plug ceramic tip broken in engine

Quote:
Originally Posted by OldNuc View Post
Need to run a proper compression test, see below. Then get a look in there with a borescope.

*COMPRESSION TESTING*
To prevent washing the cylinders down with fuel remove the PCM B fuse to shut off the fuel pump, injectors, and ignition before starting the test. Remove all spark plugs and block the throttle open. Use a low charge rate battery charger to fully charge the battery before conducting the test.

Crank the engine until the gauge quits increasing and compare both the final pressure and number of compression strokes to reach the max pressure, cylinder to cylinder. You can do this test either cold or hot or warm just mention it when stating results.

For example if you find all cylinders produce a final reading of 200psi but the compression cycles are as follows: 1-8, 2-6, 3-8, 4-14 then it should be obvious that cylinder #4 has a serious problem with leakage past either the valves or compression rings.

FSM states the MINIMUM number of compression cycles is 10 and a Fully charged battery is required to obtain the full 250RPM cranking speed.

Nominal compression for a high mileage good condition DOHC is 190-220psi and SOHC is 175-205psi.
I'll have to get or borrow a compression tester from somewhere. I did buy one, years ago, off Ebay but it was no good. (cost more to ship it back than it was worth so I ate it) This going to be expensive, I'll bet. Ugg.

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Old 09-08-2017, 06:25 PM   #45
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Default Re: Spark plug ceramic tip broken in engine

Quote:
Originally Posted by JerryHughes View Post
Had this done to the engine about 3 1/2 years ago-----
Piston ring set (Piston ring set, Rod bearing set, main bearing set)
Bored upper cyl.
New oil, filter and air filter
Spark plugs
Anti-freeze
Thermostat
Timing chain set
Engine gasket set including head gasket
Head resurfaced, valve guide, seal

What could be done to correct this?
Hey, seeing above, what was done to the car 3 1/2 years ago, is there an indication what might be wrong??? And the fact that the cylinder with the chipped ceramic plug is the same with the worst oil problem, could that broken ceramic had anything to do with that???

Last edited by JerryHughes; 09-08-2017 at 06:39 PM..

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Old 09-08-2017, 06:49 PM   #46
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Default Re: Spark plug ceramic tip broken in engine

Hey, anyone see any good sets for sale here? A lot of "deals" but I don't know if any of those brands are any good. Any feedback on these???
https://www.walmart.com/search/?page...hProductResult

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Old 09-08-2017, 06:50 PM   #47
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Default Re: Spark plug ceramic tip broken in engine

Autozone/Advance Auto near you to borrow tools charged against your credit card but not charged when the tool(s) are returned?

If the new plug(s) don't show any dents like the damaged plug, the ceramic piece is gone. Whether or not it damaged the cylinder wall, piston or rings remains a mystery until a compression test is performed........

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Old 09-08-2017, 06:54 PM   #48
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Default Re: Spark plug ceramic tip broken in engine

Quote:
Originally Posted by fdryer View Post
Autozone/Advance Auto near you to borrow tools charged against your credit card but not charged when the tool(s) are returned?

If the new plug(s) don't show any dents like the damaged plug, the ceramic piece is gone. Whether or not it damaged the cylinder wall, piston or rings remains a mystery until a compression test is performed........
Yeah, Autozone not far from me. I'll see if they "rent" or lend out, sets. If the compression is okay, what else could be wrong?

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Old 09-08-2017, 09:43 PM   #49
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Default Re: Spark plug ceramic tip broken in engine

Quote:
Originally Posted by JerryHughes View Post
Hey, seeing above, what was done to the car 3 1/2 years ago, is there an indication what might be wrong??? And the fact that the cylinder with the chipped ceramic plug is the same with the worst oil problem, could that broken ceramic had anything to do with that???
To answer that question is why the compression test and borescope inspection is required.


I am sure there will be lots of guesses but this is how you actually find out what is going on. This is impacting both #3 and #4.

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Old 09-08-2017, 09:46 PM   #50
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1998 SC2
Default Re: Spark plug ceramic tip broken in engine

Quote:
Originally Posted by JerryHughes View Post
Yeah, Autozone not far from me. I'll see if they "rent" or lend out, sets. If the compression is okay, what else could be wrong?
Scored cylinder wall from ceramic missile in there.

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Old 09-08-2017, 09:48 PM   #51
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Default Re: Spark plug ceramic tip broken in engine

Quote:
Originally Posted by OldNuc View Post
To answer that question is why the compression test and borescope inspection is required.


I am sure there will be lots of guesses but this is how you actually find out what is going on. This is impacting both #3 and #4.
Yes, affecting #3 and, not so much #4 so that may be a bright spot in the problem because if it was only the one with the broken ceramic tip, a damaged cylinder wall might be the problem. Maybe something less "scary". I will test the compression soon. Thank you, OldNuc.

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Old 09-08-2017, 09:53 PM   #52
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Default Re: Spark plug ceramic tip broken in engine

When looking back, I noticed an unusual noise coming from the engine but didn't know what it was. Pretty sure it's connected to this. Not so bad if it was "meant to be" through time but when I'm the cause, to what's going to be an expensive fix, that makes it even worse. Compression test coming.

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Old 09-08-2017, 10:46 PM   #53
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Default Re: Spark plug ceramic tip broken in engine

Jerry: This will work: https://www.walmart.com/ip/GZYF-Mult...0psi/155016316 Use the screw in adapters and only screw it until the o-ring contacts the head lightly, do not squash o-ring as it will leak.

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Old 09-08-2017, 11:07 PM   #54
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Default Re: Spark plug ceramic tip broken in engine

Quote:
Originally Posted by OldNuc View Post
Jerry: This will work: https://www.walmart.com/ip/GZYF-Mult...0psi/155016316 Use the screw in adapters and only screw it until the o-ring contacts the head lightly, do not squash o-ring as it will leak.
Thanks, OldNuc, I just bought it! Will take about two weeks to get here.

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Old 09-08-2017, 11:15 PM   #55
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Default Re: Spark plug ceramic tip broken in engine

OK, In the meantime just change out that #3 plug so that cylinder keeps firing.

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Old 09-08-2017, 11:28 PM   #56
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Default Re: Spark plug ceramic tip broken in engine

Quote:
Originally Posted by OldNuc View Post
Use the screw in adapters and only screw it until the o-ring contacts the head lightly, do not squash o-ring as it will leak.
And thanks---(I would have cranked it down as tight as I could have.)

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Old 09-08-2017, 11:31 PM   #57
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Default Re: Spark plug ceramic tip broken in engine

With that #3 plug do not do any more than get it just past hand tight as it will not be in there long. If you keep that cylinder firing you may get it to straighten out.

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Old 09-08-2017, 11:36 PM   #58
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Default Re: Spark plug ceramic tip broken in engine

Quote:
Originally Posted by OldNuc View Post
With that #3 plug do not do any more than get it just past hand tight as it will not be in there long. If you keep that cylinder firing you may get it to straighten out.
You mean to keep checking it to make sure it looks good and is not all fouled out with oil, etc.? And I should go back and make sure the other plugs are "lightly tightened" too because they'll be coming out for the test too. And if that one plug is all oiled, can I just spray clean it with throttle body cleaner and reuse?

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Old 09-08-2017, 11:48 PM   #59
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Default Re: Spark plug ceramic tip broken in engine

The other plugs are fine. It is #3 and maybe #4 that are going to foul out and as you will be changing them often there is no point of cranking them in to 18ft-lb. The #3 will last several days at best.

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Old 09-08-2017, 11:54 PM   #60
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Default Re: Spark plug ceramic tip broken in engine

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The other plugs are fine. It is #3 and maybe #4 that are going to foul out and as you will be changing them often there is no point of cranking them in to 18ft-lb. The #3 will last several days at best.
Yes, but I mean that when I check the compression in two weeks or so, I'll have to take all four plugs out anyway. So I won't crank them down harder until after the compression check. Now, as long as I can get the wires off without ripping them apart-----. I'm going to grease the bodies of the plugs up, some more so I can get them off easier. They did come off easier this time, because of being just newly installed. Oh, and when the #3 and #4 plugs are getting to that fouled stage, can I use the throttle body spray to clean and reinsert?

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