5.0 timing

black V8 · 10-25-2009, 09:19 PM

I think my timing might be off. A couple of years ago I had my timing changed to 14BTDC. These days when I put my foot into it on the highway it sounds kind of like a diesel, also when I go up a long hill if I don't kick it down a gear it will seam to miss. I always run Sunoco 94, so does this sound like a timing issue.

Thanks Tom

decipha · 10-25-2009, 10:14 PM

not usually, 4 degress is safe with 94 octane

probably the pcv screen thats clogged up, its on the back of the intake manifold beneath the cowl closer to the driver side but pretty much center in the back. Pull put the pcv valve and you'll need some tweezers or the like to remove the screen. I just removed mine and tossed it, that made me realize how nice my old 5.0 could idle, even though prior to that it idle'd as i thought beautifully

black V8 · 10-26-2009, 12:02 AM

Thanks decipha,
I new I was having an issue with this screen but didn't realize it would cause those symptoms as well, I'm gonna pull that thing out and chuck it this weekend.
Tom

joker77_2005 · 10-26-2009, 02:15 PM

dont chuck it,clean it and put it back in.that screen filters out any large particles that maybe in the lifter valley
kinda like running ur car without a airfilter
mike

MadMikeyL · 10-26-2009, 02:27 PM

Quote:

Originally Posted by joker77_2005

dont chuck it,clean it and put it back in.that screen filters out any large particles that maybe in the lifter valley
kinda like running ur car without a airfilter
mike

If there are large particles in the lifter valley, your engine is about to die anyway and the PCV system is the least of your worries. If you clean it and put it back, it can just get clogged up again. I would also just throw it away.

joker77_2005 · 10-27-2009, 01:04 PM

Quote:

Originally Posted by MadMikeyL

If there are large particles in the lifter valley, your engine is about to die anyway and the PCV system is the least of your worries. If you clean it and put it back, it can just get clogged up again. I would also just throw it away.

wrong,the egr passages are under the intake ,and do cook the oil and turn it into sludge grit and gunk,and the pcv screen filters out those particles from entering the intake and causing hung/broken valves and also carbon buildup in the intake
do the right thing and clean it ,then put it back in
or just take that filter out and suffer down the road
i guesss ford didnt know what they were doing

MadMikeyL · 10-27-2009, 02:53 PM

Well certainly nothing big enough to damage your valvetrain is going to make it through the PCV valve. At worst you could say that something could get in there and make you have to replace the PCV valve, but it won't damage the engine. Also, if you have sludge, you don't change your oil frequently enough. There should not be any sludge, grit, or gunk, anywhere in the oiling system. If there were sludge in the valley, it would cause one of 2 things, either it would drip down and clog up the oil pump pickup and you would lose oil pressure, or it would block the passages and oil would not be able to drain back to the pan, and you would lose oil pressure. Like I said, if there are any particles in the valley large enough to be filtered out by that screen, then your motor has other issues and a PCV valve is the least of your worries. Now as for the screen, I have seen many 5.0s with that screen gummed up causing the PCV system not to work properly, and I have seen many 5.0s with that screen removed that have never had any issue. I have never seen one motor where it sucked something up through the PCV valve and damaged the valvetrain. That simply does not happen.

tomnh · 11-04-2009, 07:33 PM

Quote:

Originally Posted by black V8

Thanks decipha,
I new I was having an issue with this screen but didn't realize it would cause those symptoms as well, I'm gonna pull that thing out and chuck it this weekend.
Tom

Please don't just throw it out. You will just be sucking oil into your your engine. Replace it instead. That screen acts as a filter and oil seperator.

decipha · 11-06-2009, 01:15 PM

its a screen not a filter, as stated it can do more harm than good

if it clogs and the pcv can't evacuate excessive crankcase pressure your rings will wear more and thus cause more engine wear than needed.

do your engine a favor and chunk it, its a bad design just like ford does with many things. I'm sure if it was that important they wouldn't have eliminated that screen in the 95+ 5.0 explorers and 351 equipped f series trucks

10-25-2009, 09:19 PM	#1
black V8 1st Gear Poster Join Date: Mar 2008 Location: Toronto,ON,Can. Car: 1991 Thunderbird Sport Engine: 5.0 litre V8 Posts: 53	5.0 timing I think my timing might be off. A couple of years ago I had my timing changed to 14BTDC. These days when I put my foot into it on the highway it sounds kind of like a diesel, also when I go up a long hill if I don't kick it down a gear it will seam to miss. I always run Sunoco 94, so does this sound like a timing issue. Thanks Tom

10-25-2009, 10:14 PM	#2
decipha PostWhore Join Date: May 2007 Location: New Orleans, LA Car: 92 Tbird Engine: 6.7 Age: 21 Posts: 1,034	not usually, 4 degress is safe with 94 octane probably the pcv screen thats clogged up, its on the back of the intake manifold beneath the cowl closer to the driver side but pretty much center in the back. Pull put the pcv valve and you'll need some tweezers or the like to remove the screen. I just removed mine and tossed it, that made me realize how nice my old 5.0 could idle, even though prior to that it idle'd as i thought beautifully __________________ black 90 5spd sc - 10% & exhaust red 90 5spd sc - 10% & exhaust titanium 91 auto sc - 100% stock black 94 5spd sc - heads 92 5spd 408 turbo

10-26-2009, 02:15 PM	#4
joker77_2005 5th Gear Poster *Membership Expired* Join Date: Nov 2005 Location: WV Car: 1994 XR7 Engine: 4.6 Age: 32 Posts: 359	dont chuck it,clean it and put it back in.that screen filters out any large particles that maybe in the lifter valley kinda like running ur car without a airfilter mike __________________ 1990 ford f150 5.0 1990 cougar xr-7 5spd 5.0 1989 mustang gt 10.68@126.97 1984 tbird 5.0 auto

10-27-2009, 02:53 PM	#7
MadMikeyL Seasoned PostWhore Join Date: May 2003 Location: Tinton Falls, NJ Car: 8991 Cougars Engine: 3.8SC, 393 Age: 27 Posts: 3,906 MadMikeyL's Arcade Awards Snake Ms Pacman	Well certainly nothing big enough to damage your valvetrain is going to make it through the PCV valve. At worst you could say that something could get in there and make you have to replace the PCV valve, but it won't damage the engine. Also, if you have sludge, you don't change your oil frequently enough. There should not be any sludge, grit, or gunk, anywhere in the oiling system. If there were sludge in the valley, it would cause one of 2 things, either it would drip down and clog up the oil pump pickup and you would lose oil pressure, or it would block the passages and oil would not be able to drain back to the pan, and you would lose oil pressure. Like I said, if there are any particles in the valley large enough to be filtered out by that screen, then your motor has other issues and a PCV valve is the least of your worries. Now as for the screen, I have seen many 5.0s with that screen gummed up causing the PCV system not to work properly, and I have seen many 5.0s with that screen removed that have never had any issue. I have never seen one motor where it sucked something up through the PCV valve and damaged the valvetrain. That simply does not happen. __________________ 91 Cougar LS 393, ported holley systemax 2 heads, typhoon intake, 1 3/4 longtube headers, 70mm halfshafted throttle body, more cowbell, M5R2 trans, aluminum driveshaft, engine lowered and moved back 1". 89 XR7 3.8SC 5-speed, under restoration/modification. 98 Mark VIII LSC, T45 swap and 3.73s. Soon to come, C-heads. "Your buddy Mike is INSANE" -ClintD's dad

10-26-2009, 12:02 AM	#3
black V8 1st Gear Poster Join Date: Mar 2008 Location: Toronto,ON,Can. Car: 1991 Thunderbird Sport Engine: 5.0 litre V8 Posts: 53	Thanks decipha, I new I was having an issue with this screen but didn't realize it would cause those symptoms as well, I'm gonna pull that thing out and chuck it this weekend. Tom

11-06-2009, 01:15 PM	#9
decipha PostWhore Join Date: May 2007 Location: New Orleans, LA Car: 92 Tbird Engine: 6.7 Age: 21 Posts: 1,034	its a screen not a filter, as stated it can do more harm than good if it clogs and the pcv can't evacuate excessive crankcase pressure your rings will wear more and thus cause more engine wear than needed. do your engine a favor and chunk it, its a bad design just like ford does with many things. I'm sure if it was that important they wouldn't have eliminated that screen in the 95+ 5.0 explorers and 351 equipped f series trucks

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