Number 8 dead
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Number 8 dead
I have a 93 f-150 4 wheel drive. 302 engine 5 speed manual. Was pulling a light load and lost some power. After futher investigation I found it had blown alot of oil out of the engine most on drivers side. Couldn't tell where it was comming from. The number 8 plug was oil soaked and I did a compression check and found it has no compression. I mean 0. I took the valve cover off and the springs seem to be ok. Any ideas on what the problem is.
Thanks Dwain
Thanks Dwain
Senior User
Joined: Jul 2004
Posts: 141
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From: Il.
crank the engine over and be sure valves are opening and closing. best way to check out more is be sure both valves on #8 are closed & put air pressure in the cyl. & see if it comes out intake,exhaust or from crankcase.but it sounds like you have bad rings or hole in piston.
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Joined: Oct 2004
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From: Grove City, Pa.
Remove the top of the airbox, Remove the air filter, and see if there is engine oil in the bottom of the airbox. This comes from blowby through the PCV tube. If so you may have a hole in the piston. (mine did)
Post Fiend
Joined: Nov 2001
Posts: 14,947
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From: Topsfield, MA
The #8 is known for problems....
The PCV position is at the back of the upper intake manifold, and the #8 cyl gets the majority of it. It doesn't get the right mixture and over many many many miles it finally catches up to some of us.
This could very well be whats wrong. It's a good idea to plug the back hole and run the PCV in a different port.
Sounds like a teardown is necessary to find the problem.
The PCV position is at the back of the upper intake manifold, and the #8 cyl gets the majority of it. It doesn't get the right mixture and over many many many miles it finally catches up to some of us.
This could very well be whats wrong. It's a good idea to plug the back hole and run the PCV in a different port.
Sounds like a teardown is necessary to find the problem.
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Joined: Oct 2004
Posts: 14
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From: Grove City, Pa.
How can a PCV valve in the wrong location cause a lean condition? This is a dry Intake Manifold (air only no fuel). Fuel is injected into the cyl. This makes no sense to me. Mine went bad at 62,000. this is not a lot of miles.
What I mean to say is the PCV is upstream from the fuel mixture in the manifold. the Injector is located in the intake runner just prior to it entering the Cyl. a intake leak can cause this problem, a PCV can not. Sorry, I have been looking at Diesels every day lately
What I mean to say is the PCV is upstream from the fuel mixture in the manifold. the Injector is located in the intake runner just prior to it entering the Cyl. a intake leak can cause this problem, a PCV can not. Sorry, I have been looking at Diesels every day lately
Last edited by TigerDan; Mar 20, 2006 at 09:26 AM. Reason: Condensed posts
Post Fiend
Joined: Apr 2004
Posts: 6,473
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From: Lafayette, IN
The PCV pulls oil vapors out of the valve covers, and with its location on the back of the upper intake manifold (plenum), all those vapors get dumped right into the #8 cylinder (rear cyl on driver's side). I lost a 302 to it, my wife's cousin lost one to it, and I've heard of several others. Anecdotal, yes, but way too common of a problem. The typical solution is plug the hole in the back of the manifold and re-route the PCV hose to the vacuum tree on top of the plenum.
Sorry, Dwain, but it sounds like you've got an expensively sick 302 there.
Jason
Sorry, Dwain, but it sounds like you've got an expensively sick 302 there.
Jason
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New User
Joined: Oct 2004
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From: Grove City, Pa.
These engines do have their problems, the most serious of witch is crossfiring of the number 8 plug and there is a TSB on this...Here is a article:
http://www.findarticles.com/p/articl...09/ai_n8855470
http://www.findarticles.com/p/articl...09/ai_n8855470
Last edited by TigerDan; Mar 20, 2006 at 09:27 AM. Reason: Fixed link
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Post Fiend
Joined: Nov 2001
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From: Topsfield, MA
Originally Posted by jroehl
The PCV pulls oil vapors out of the valve covers, and with its location on the back of the upper intake manifold (plenum), all those vapors get dumped right into the #8 cylinder (rear cyl on driver's side). I lost a 302 to it, my wife's cousin lost one to it, and I've heard of several others. Anecdotal, yes, but way too common of a problem. The typical solution is plug the hole in the back of the manifold and re-route the PCV hose to the vacuum tree on top of the plenum.
Sorry, Dwain, but it sounds like you've got an expensively sick 302 there.
Jason
Sorry, Dwain, but it sounds like you've got an expensively sick 302 there.
Jason
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