Oil under coil covers - 2003-04 Mach 1 Registry Owners Club

stangmach104 · 05-28-2010, 06:22 PM

Hey guys... I problem but I'm pretty sure I know what it is just wanted to get some input first. I noticed a couple days ago that my mach hasn't been making as much power under boost as it has been but it still makes boost fine. So I've been trying to figure out why... Today I noticed oil leaking down the side driver side valve cover. So i took off the coil cover and the spark plug all the way to the back is covered in oil. The spark plug is still tight and the engine is running fine. So I'm thinking its just the seal under the valve cover that went bad even though it looks fine. I don't know what else would cause this over one spark plug. And could this be why I'm loosing power under boost?

ponygt65 · 05-28-2010, 09:38 PM

Quote:

Originally Posted by Mach1Marauder

Think about it. You are correct about where the oil is coming from(the round gaskets that you install under the cam covers), but WHY is it leaking? Is it leaking because you have too much crankcase pressures or is it a simple gasket leak?

Check you catchcan and crankcase ventilation system.

I had the same problem. OIl under the coil covers and had excessive oil (dumping out every day or two 1/3 full) in the catchcan/seperator (switched to a catch can after a while).

Checked CR and #8 was low. smoke puff, pause, smoke puff, pause. Without tearing apart the motor (no Mulah), we guessed it was a fried piston ring.

stangmach104 · 05-29-2010, 12:16 AM

got the valve cover out already. Going to replace the seals tomorrow. Catch can is fine same with ventilation. Could this leak also be the power loss during WOT?

stangmach104 · 05-29-2010, 12:35 AM

ok thanks for the help!

05-28-2010, 06:22 PM	#1
stangmach104 Registered User Join Date: Jun 2005 Location: Minneapolis, MN Posts: 120	Oil under coil covers Hey guys... I problem but I'm pretty sure I know what it is just wanted to get some input first. I noticed a couple days ago that my mach hasn't been making as much power under boost as it has been but it still makes boost fine. So I've been trying to figure out why... Today I noticed oil leaking down the side driver side valve cover. So i took off the coil cover and the spark plug all the way to the back is covered in oil. The spark plug is still tight and the engine is running fine. So I'm thinking its just the seal under the valve cover that went bad even though it looks fine. I don't know what else would cause this over one spark plug. And could this be why I'm loosing power under boost? __________________ #6690 Forged Short Block built by myself, Procharger D1SC Stage 2 s/c cams, Custom o/r x-pipe Flowmaster Cat Back, Mid-Length Headers 2 Walbro 400lph pumps on return style system 95# Fuel Injectors 10% O/D Balancer, AFM Power Pipe 630 rwhp 531 rwtq

05-29-2010, 12:16 AM	#3
stangmach104 Registered User Join Date: Jun 2005 Location: Minneapolis, MN Posts: 120	Re: Oil under coil covers got the valve cover out already. Going to replace the seals tomorrow. Catch can is fine same with ventilation. Could this leak also be the power loss during WOT? __________________ #6690 Forged Short Block built by myself, Procharger D1SC Stage 2 s/c cams, Custom o/r x-pipe Flowmaster Cat Back, Mid-Length Headers 2 Walbro 400lph pumps on return style system 95# Fuel Injectors 10% O/D Balancer, AFM Power Pipe 630 rwhp 531 rwtq

05-29-2010, 12:35 AM	#4
stangmach104 Registered User Join Date: Jun 2005 Location: Minneapolis, MN Posts: 120	Re: Oil under coil covers ok thanks for the help! __________________ #6690 Forged Short Block built by myself, Procharger D1SC Stage 2 s/c cams, Custom o/r x-pipe Flowmaster Cat Back, Mid-Length Headers 2 Walbro 400lph pumps on return style system 95# Fuel Injectors 10% O/D Balancer, AFM Power Pipe 630 rwhp 531 rwtq

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