94 mustang gt oil on spark plugs
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Old May 7th, 2009, 07:50 PM   #1
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94 mustang gt oil on spark plugs


Hey everyone the car has new heads, cam, upper and lower intake and all other common bolt ons. The car only starts when I hold the pedal down and there is alot of oil in the intake and on all the plugs. Did a compression test and got #1=165, #2=170, #3=155, #4=165, #5=165, #6=155, #7=155, #8=155. I have an blaster coil and ingnition box. The car will smoke bad when i get on the throttle and it lacks power . It idles terrible also once it starts. I have replaced all sensors(TPS, IAC etc...). Not sure if the piston oil rings are done and compression rings are still good or what. Any help would be appreciated. Thanks in advance
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Old May 7th, 2009, 10:44 PM   #2
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Anybody have any ideas???????????????????????
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Old May 8th, 2009, 09:34 AM   #3
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have you tried chaning your spark plugs, your compression sounds fine and how many miles are on the car
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Old May 8th, 2009, 12:16 PM   #4
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No, I will try new plugs today. Also after looking around on this site, I think my PCV line is to big and I have it all hooked up in the wrong order which may be pulling oil in. I'm thinking the PCV is the culprit because otherwise all 8 of my oil control rings failed at once. I am going to hook the lines up right and get new plugs and see what happens. Oh, will the car start if I put the cam in wrong????? It starts and idles fine but its hard to start it, so I was thinking the excess oil+fuel was throwing off the AF ratio bad.
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Old May 8th, 2009, 12:17 PM   #5
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Car has about 150,000 on it. Everything is new on it except the pistons and block. Even has a brand new C4 tranny
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Old May 8th, 2009, 01:37 PM   #6
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if you put the cam in wrong, no it will not likely start because your timing would be wayyyy to far off. the oil on your spark plugs would be the reason why its hard to start.
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Old May 8th, 2009, 11:24 PM   #7
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Ok, so I got new plugs and ran the vacuum lines the way they were originally(Found a good diagram) and the car started right away with no issues. Idled for a while then shut it down. Went to re-start and it just cranked, pulled my top line on the upper intake and it poured a bunch of oil out of it. What would cause the excessive crankcase pressure that's causing oil to be pushed in the intake? Car has no cats, but the mufflers are original equipment. Could they be clogged causing excess back pressure? I appreciate you all giving me ideas, Thanks.
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Old May 9th, 2009, 05:37 AM   #8
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maybe bad valve guides...
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Old May 9th, 2009, 08:43 AM   #9
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I guess that is possible. The heads were bought new less than a year ago from World Products. Very very low miles on them. They are the windsor jr heads. Oh my vacuum guage is only going to like 10 when the car is idling???????
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Old May 9th, 2009, 09:50 AM   #10
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Sounds like there's either something wrong with your PCV line, or the vacuum line from the passenger side valve cover oil filler neck to the intake pipe is blocked.
The compression numbers are good so there's nothing wrong with the piston rings. I don't think the valve guides in new heads will be worn either.
Check the crankcase ventilation system. I'm sure that's where you'll find the problem.
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Old May 12th, 2009, 12:35 PM   #11
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Well I am going to try to change the screen in the bottom of the PCV in the lower intake and put a air/oil separator in and see if clears things up. THen I will see how fast the separator fills up.
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Old May 12th, 2009, 09:38 PM   #12
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Ok, cleaned out the wire mesh screen under grommet for PCV, installed an air oil separator and no more smoking and so far no oil in the intake. The separator seems to still be empty also so maybe the screen was clogged causing excess crankcase pressure.
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