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Old 03-23-2010, 09:12 PM   #1
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Engine runs like Cr@P? Check the plugs!

My 1.6 8-valve has been running worse over the winter.

At first I thought that it just needed the "cobwebs" blown out.

Unfortunately, the following problems did not go away after a bit of driving:

Rough running, mild backfires, poor performance.

I checked the sparkplug wires and although reseating the sparkplug wire connections at both ends did seem to help a little, the problem was still there.

So I removed the sparkplugs for inspection.

All four of them had heavy tan deposits on them!

Here is basically what my plugs looked like:


(courtesy http://www.verrill.com)

This type of deposit is caused by "the burning of oil and/or fuel additives during normal combustion ... normally non-conductive. When heavier deposits are allowed to accumulate over a longer mileage period, they can 'mask' the spark, resulting in a plug misfire condition."

A quick trip the O'Reilly's for a new set of NGKs and a bit of wrenching had the engine running MUCH better! Apparently the tan buildup WAS masking the spark path as described above - causing a lot of fuel to end up detonating in the warmed-up exhaust pipe instead of inside the cylinder.

So, it looks like maybe I am burning a bit of oil through the valve seals as I do not use any fuel additives... Though occasionally, I do buy cr@p gasoline.

I hope that this helps!
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Old 06-15-2013, 03:18 PM   #2
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What number ngk are you running Ack ? I just changed my plugs,and went from a bpr5egp to a bpr6es. Mine seems to be running a tad rougher with the new plugs.

I know you changed them since 2010, but still a relevant thread to my questions
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Old 06-15-2013, 04:33 PM   #3
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spark plugs...

Dang, Mullet! It's raining like it's the 'effin End Of The World right now!

You don't want me to MELT, do you?



I should have indicated exactly what plugs I bought, eh?


I'll find out and get back to you on this in a bit...


June 15, 2013 4:31pm
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Old 06-15-2013, 05:17 PM   #4
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Well alcohol is a fuel additive, even though it is the refinery doing it. Wait until E15 becomes a standard fuel....that mixed with a little oil blowby is what probably created the interesting growths on your plugs.

thanks for the reminder to check mine!
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Old 06-15-2013, 07:15 PM   #5
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Quote:
Originally Posted by ack View Post
Dang, Mullet! It's raining like it's the 'effin End Of The World right now!

You don't want me to MELT, do you?



I should have indicated exactly what plugs I bought, eh?


I'll find out and get back to you on this in a bit...


June 15, 2013 4:31pm
Melt ??? I'd just have to worry bout floating off

I'm pissed with my new plugs. First time in my life I changed the plugs and it runs worse than with the new ones. I reckon I could change them back. I did change the wires and cap and button too, and I already rechecked to be sure everything is good. Maybe I got a bad part ?
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Old 06-16-2013, 04:37 AM   #6
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Mullet check the gap well. we've seen a lot of the ngk's that have a softer tip on them, slightly bump them installing them and they bend.
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Old 06-16-2013, 09:15 AM   #7
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Here is a link to NGK spark plugs, the higher the number the "colder" the plug, if you want hotter than a 5 you need a 4.

Ack, throw a little HEET or Seafoam in the tank.

http://www.ngksparkplugs.com/tech_su...k_plugs/p2.asp
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Old 06-16-2013, 01:15 PM   #8
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So I went from a hotter plug to a cooler plug. I cant believe it made that much of a difference. Im going back to a 5 instead of the 6 and that should fix my problem.
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