Oil at the throttle body

[jimmylightning]

In response to another message posted I recently remove the rubber boot from the stock air box to the fenderwell. In doing so to lift the box off I took off the connection at the throttle body. I then noticed oil at the throttle body. I called SVT nad they said I had put too much oil in the truck when I had changed it, but I have my oil changed at the Ford dealer where I bought it. Does any one no of a way besides the oil thing as to how to prevent this. Also I've noticed what seems to be a miss in the truck when it sits at idle. My dealer said that was something inherant in the truck. SVT said he was full of bull. Should I have the dealer pull all the plugs and look for ones that may be fouled and is the oil problem connected with this.

Thanks

Jim

[Jstas]

Its really hard to say without actually seeing the problem first hand. However, oil in the intake system could cause a misfire in a cylinder or two at idle. When under load though, the chamber temperatures would be significantly high enough to burn all the oil in the chamber without issue.

I do not see how blow by caused by over-filling the crank-case could work its way into the intake system all the way up to throttle body. It would have to get past the combustion chamber. Since the engine only pumps oil when it is running, blow-by would be burned and blown out the exhaust before it could ever work its way past the intake valves, against the flow of the intake charge and past the super charger. If it did, thats pretty impressive oil and I'd like to know where I could get some!

What may be your problem is one of two things. One, you have an intake gasket leak. Two, the seals in the blower have gone bad and the oil you are seeing is oil from the blower which, if I remember correctly, is independant of the crank case.

To figure out the misfire problem, you can pull the plugs yourself and check. Just do one at a time. Check each plug by pulling it, examining the electrode and putting it back in. Make sure you keep track of your findings. To find a mis-firing cylinder, the plug will have sooty, black deposits. It may also be discoloerd. That would be evidence of a rich condition if it is a mis-fire due to oil. If the plug is a dark-brownish color and the electrode looks discolored or chalky, you have a lean condition and it may be due to a malfunctioning injector.

If your current dealer is unwilling to assisst with your concerns in a manner that is satisfactory to you then take it someplace else. You may want to even try taking it to a tuner like JDM Enginering or what have you. They are much more likely to do you right because they want you to come back and buy thier stuff and get you to let them put it on.

It would suck if it came to that but, if you have to diagnose a problem and your local dealer is a dead end, you go where you need to go and do what you have to do to get the job done and done right. Good luck and don't be afraid of your truck. Don't be afraid to check things out yourself. Checking plugs is a simple deal and shouldn't take more than 20 minutes.

[BlueOvalBolt]

This has unfortunely been a problem since 99 and has been the topic of many posts on NLOC and F150online. I am by no means an expert but is a problem I have had and have read about this for quite sometime. Under boost conditions, vacuum causes oil to collect in the intake. Some have found a direct correlation between the how many times boost is used to the amount of oil being sucked in. No one has come up with a definitive cause/solution to this problem yet but there have been experimental devices developed to stop it.

Ford's answer has always been that Lightnings should only read one half between add and fill on the dipstick to prevent this from happening and will typically blame overfilling as they did with you. They will also tell you it is normal to use a quart of oil every 3,000 miles as they did with me. That's hard to swallow.

Oil breathers have been used but with limited success as they present their own set of problems.

The most recent development by some tuners and inventive L owners has been the oil separators in line with the PCV. This collects the excess oil before being sucked into the motor further. It would appear this device stops oil collecting in the intake resulting in constant dipstick readings.

Here are some links discussing the problem and the use of oil separators.

http://www.f150online.com/forums/showthread.php?s=&threadid=94480
http://www.f150online.com/galleries/albumview.cfm?num=1498
http://www.nloc.net/forum/showthread.php?s=&threadid=19681
http://www.f150online.com/forums/showthread.php?s=&threadid=94792
http://www.f150online.com/forums/showthread.php?s=&threadid=94892

[I1AGAIN]

What you have is positive crankcase pressure apon deceleration. A very simple cure is to run a oil breather cap in place of your oil cap. I know of no adverse effects of running one as someone else had said above. I reccomend them and have had one on my truck for the last 30,000 miles. Cost is around $30.:spinem:

Dave

[Jstas]

How do you deal with the oil that will inherently be expelled from the cap?

[BlownSVT]

I have the same prob.......I had to have my whole ducting assembly replaced because the darn thing got oil SOAKED and caused all of my vac lines to not be able to stay in.....causing a serious idle and startup prob........thank god for warranty.....I thought that it had to do with the intercooler recall.....anyone know?:mad:

[jimmylightning]

I had a good conversation with Dave at JDM in Charolette today and ordered the oil cap breather. His experience with Lightnings convinced me this will take care of my problems.

Thanks for the replys

Jim

I put some photos in my gallery of my truck. I was trying to show my new chrome SVT wheels and my stainless tips with my catback magna flow exhaust!!

[lightningdt]

But don't you have to have a chip to run a breather??? If not I will buy one today. I'm bone stock.

:knock:

[jimmylightning]

No, I talked to Dave at JDM nad there is a slight possibility of having a problem when you come down hard off of a high speed run, but he's run on in his for more then $30,000 miles with no problems. I haven't had any problem with mine either.

Jim

[lightningdt]

So your saying I can run a breather with little to no problems??? What about one on the Driver side and Passenger side or both.

Thanks.

[jimmylightning]

Here's the guy you need to talk to. He works for JDM out of Char. NC. The number is:

1-704-333-5821 ask for Dave he can handle all your questions plus you can order it through him and have it in a couple of days.

Jim