Bad number 8 cylinder??? - Mustang Evolution

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Old 03-26-2013, 06:18 PM   #1
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Bad number 8 cylinder???

I may have a bad #8 cylinder It smokes under acceleration. I pulled the #8 plug and found oil on it I haven't checked the others yet. I'm thinking bad rings but someone told me it could be a plugged pcv valve and the pressure is causing oil to go through my valves into my cylinders. Ever heard of this?
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Old 03-26-2013, 06:39 PM   #2
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Its possible but if it was the pcv then it would most likely be more than one cylinder. Pull it off and check it. Make sure the check valve isn't froze up. But more importantly I would do a compression test. All cylinders should be with in 5 to 10 lbs. ..
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Old 03-26-2013, 06:43 PM   #3
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I'll pull the other plugs and check. I was told the car sat for about 5 years before I picked it up so anything is possible. It runs good and doesn't smoke when you start it or let it idle but it is old with 104k on the clock.
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Old 03-26-2013, 06:49 PM   #4
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When you pull the pcv make sure it has a screen on it to. Some times those get left off and will allow oil to get into the intake.

In your first post you say #8 is smoking but them you said the car doesn't smoke? So what exactly are you getting smoking, and what color is the smoke.
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Old 03-26-2013, 06:50 PM   #5
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Quote:
Originally Posted by 67mustang97 View Post
I'll pull the other plugs and check. I was told the car sat for about 5 years before I picked it up so anything is possible. It runs good and doesn't smoke when you start it or let it idle but it is old with 104k on the clock.
Check the hose between the oil fill on the valve cover and air intake.. If it's clogged it will smoke under acceleration.
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Old 03-26-2013, 07:04 PM   #6
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The smoke looks gray only under acceleration.

---------- Post added at 08:04 PM ---------- Previous post was at 08:02 PM ----------

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Originally Posted by dreamstang View Post
When you pull the pcv make sure it has a screen on it to. Some times those get left off and will allow oil to get into the intake.

In your first post you say #8 is smoking but them you said the car doesn't smoke? So what exactly are you getting smoking, and what color is the smoke.
I've never seen a screen is it in the pcv valve?
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Old 03-26-2013, 07:07 PM   #7
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The smoke looks gray only under acceleration.
Yup definitely getting oil in there some how. hopefully u get lucky and is just the pcv but usually that means time for rebuild. Do the test and let us know what you find.
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Old 03-26-2013, 07:09 PM   #8
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The smoke looks gray only under acceleration.

---------- Post added at 08:04 PM ---------- Previous post was at 08:02 PM ----------



I've never seen a screen is it in the pcv valve?
It should be right before it. It will look something like this.
http://www.latemodelrestoration.com/...ehicle=Mustang
If this is your problem you will have oil on more than one plug and oil in your intake.
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Old 03-26-2013, 07:10 PM   #9
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Yeah I will, thanks for the help guys. My luck I'll need to do the engine tranny and diff.
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Old 03-26-2013, 10:57 PM   #10
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The smoke looks gray only under acceleration.

---------- Post added at 08:04 PM ---------- Previous post was at 08:02 PM ----------



I've never seen a screen is it in the pcv valve?
It is a Breather Filter, an element found inside the lower intake manifold inside the hole that you pull the pcv valve out of. You can extract it w/ a hook tool or by using a long screw 4-5 inches long. A replacement can be purchased for about $10.
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Old 03-27-2013, 01:33 AM   #11
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It is a Breather Filter, an element found inside the lower intake manifold inside the hole that you pull the pcv valve out of. You can extract it w/ a hook tool or by using a long screw 4-5 inches long. A replacement can be purchased for about $10.
I just cleaned mine with brake cleaner last time i rebuilt my top end, don't know if that was good lol

Could be part of my oil leak problems, figured it was my old oil pan gasket/leak at the drain plug which is minor
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