I have heard that the 5.0 in the trucks have a nasty problem of sucking all the PCV oil vaper into the #8 cylinder causing detonation problems ETC. i saw a artical once on the subject but i cant seem to find it. i got the intake off and just need to know were the best to pop a new hole in the intake.

 

The best solution I read was putting a oil separator in the line. Then from time to time drain the bowl, after a short time you'll know how often to do it.

 

On my truck, I hooked the PCV valve to where the brake booster line normally connects, then connected the brake booster to the vacuum port on the rear of the manifold. It's been a couple years now, and no problems.

 

I too remember reading about it, but don't know for sure where. One other option is to find a newer style (my 95's have it) upper intake where Ford routed it correctly.

 

well if you are sucking oil vapor like that, then you have ring problems.

however.....the Ford engines with the 1-5-4-etc timing have the exact same firing order as the chevy small block.

meaning instead of crossfiring 5-7 in a chevy, you have 7-8 crossfire in the ford. This was TSB'd about 18 years ago - route the #8 plug wire out of the harness, back along the intake, then over the solenoid pack and report back.

 

It was also reported that the PCV dumping into the #8 cylinder can cause premature engine failure. At least one manufacturer of rebuilt engines requires PCV relocation for the warranty to be valid. The 7-8 crossfire is certainly an issue, but so is the PCV location.

 

[QUOTE=quaddriver;6372968]well if you are sucking oil vapor like that, then you have ring problems.

I rebuilt the engine 15,000 miles ago. It pulls nearly 20 inches of vaccum at idle and i have no oil in the airbox. Just to see what would happen i stuck a vaccum gauge on the end of the pipe going to the air box from the oil filler neck and it was pulling 15 inches of vaccum. If anything it sucking so hard its pulling oil into the upper plentum.

 

it reminds me i just put in a new PCV valve today maybe it was goofed up

 

Its a pain to replace one

I replaced mine for the second time at 120,000 the valve looked brand new (clean) that made me feal good!

 

go to Ford Fuel Injection
look in the down load files for he pcv relocate article