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post #1 of (permalink) Old 09-14-2001, 05:01 PM Thread Starter
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Crud on #4 spark plug?

Get this, I was doing a compression test on the zook (1:160,2:154,3:153:4:150) and noticed ONLY on # 4 spark there was a lot of crud on the electrode. No nono, not just oil, there was like a glob of this gunk on there (I think it had shorted the plug). I have read something pertanant to the egr system fowling #4 plug. I am thinking on removing the egr valve and capping the intake holes it leaves. I am running a stock carb. Can I do this?! Many thanx goes to all..

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post #2 of (permalink) Old 09-14-2001, 09:21 PM
 
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Re: Crud on #4 spark plug?

Nowhere,
If you have a catalytic converter that is working and you disconnect the egr valve it will eventually burn out the catalyst and clog the convertor. The cat needs this valve to allow intake air into the exhaust stream to reduce NoX emissions and cool the cat operation. I would recommend removing the egr and soaking only the pintle side in carb cleaner and cleaning all the passages of carbon deposits and reinstalling. Also, zooks are known for pistons melting down due to running hot spots related to stuck open egr's. Broken piston skirts are also a problem with these engines.. Maybe the deposits are aluminum?? If it is black mush & gooey you are mixing oil usage with carbon deposits. Possible engine rebuild coming up in the near future...
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post #3 of (permalink) Old 09-14-2001, 09:22 PM
 
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Re: Crud on #4 spark plug?

Nowhere,
If you have a catalytic converter that is working and you disconnect the egr valve it will eventually burn out the catalyst and clog the convertor. The cat needs this valve to allow intake air into the exhaust stream to reduce NoX emissions and cool the cat operation. I would recommend removing the egr and soaking only the pintle side in carb cleaner and cleaning all the passages of carbon deposits and reinstalling. Also, zooks are known for pistons melting down due to running hot spots related to stuck open egr's. Broken piston skirts are also a problem with these engines.. Maybe the deposits are aluminum?? If it is black mush & gooey you are mixing oil usage with carbon deposits. Possible engine rebuild coming up in the near future...
rodnee

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post #4 of (permalink) Old 09-15-2001, 08:15 AM
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Re: Crud on #4 spark plug?

EGR operation- Exhaust gas recirculation right? whet happens is some of the exhaust from number 4 cly is ducted to the intake via the EGR valve. My understanding is that
this is supposed to help with emmisions, I will do some eading on this now I am curious. Note this is not A.I.R.
injection as chevy etc use. so Rodnee i think you are incorrect. The egr does not add air to the exhaust stream.
the old A.I.R. pumps used to do this (My suburban has this)
which do as you describe. Just wanted to clear this up/ Not slam you BTW.

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post #5 of (permalink) Old 09-16-2001, 09:11 PM Thread Starter
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Re: Crud on #4 spark plug?

My cat converter is long gone. Is it possible to completly remove the egr and have a functional stock suzuki? And yes, the egr does regulate exhaust gasses... I did not find any plumbing from the old cat converter when I removed it.?! hmmmmm

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post #6 of (permalink) Old 09-17-2001, 12:34 PM
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Re: Crud on #4 spark plug?

Make sure your plug wires are all good, and the dist cap is
clean. that may cause the glop of stuff on the plug.

Glenn
87' Zook Spoa,M/L 33's, 4.16 tcase,4.62 gears Camo,Header,2"exhuast, Cam.
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post #7 of (permalink) Old 09-18-2001, 12:29 PM Thread Starter
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Re: Crud on #4 spark plug?

Both checked out ok (recent replacement too, about 2 or so months on both plugs cap and rotor). I'm going to take the egr valve off and clean it out (it is frozen solid now).

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