Contour Enthusiasts Group Archives Forums Modifications Duratec Maintenance LIM/UIM cleaning

how long does it take to do the LIM/UIM cleaning/rebuild? I am just trying to plan it out so I can figure out the best way to go about it. Thanks.

on a good day.. the whole day.. usually a weekend project though.

You might want to split it up into two projects. First the UIM, then the LIM.

It took me two days, since I grossly underestimated the time required to clean up all the crud baked onto the LIM.

I should add that to the howto.

-Lance

Lance:

Just how much open should the secondaries stop screw be adjusted. I might be (am) a little thick in the head and didn't understand what you meant by "¾ of the travel on the screw".

Is there a measurement you can assign say to the gap between the edge of the butterfly and the bore of the port, like using the diameter of a drill bit as a gauge?

Kurt

About 4 hours if you use lots of spray cleaner B-12 chemtool spray works great, but you need to use an old toothbrush to speed it up. I could see it taking all day if you soak them, but I'm most concerned where the ports become smaller. Oh yeah, a whole role of good blue paper shop towels is good to have on hand.

thanks for the info.

took me about 10 hours to do a friends.
and that involved a trip to the parts store for the EGR gasket.
i used a soft stainless steel cup brush and flat round brush in a dremel to speed things up.

May I strongly suggest another easier way to clean the intake manifolds?

It involves using injector cleaner fed directly into the intake manifold with the engine running.

Materials and tools needed. One or two cans of your favorite injector cleaner. A three foot length of vacuum hose that is just the right diameter to fit snugly into the intake vacuum ports on the top of the intake manifild just behind the throttle body. A pair of vice grip pliers to use as a metering device (I like the long nose type). An ordinary screwdriver or two.

Remove one of the two vacuum lines from the intake manifold by hold the retainer ring against the manifild with a screw driver while gently pulling or prying the fitting up and out. If you do this correctly the fitting should slide right out. Fit your cleaner vacuum hose into the hole and make sure it is a snug fit. Open the cleaner and drop the other end of the hose into the open container of cleaner. I like to sort of wedge the bottle of cleaner between the battery and the headlight support to keep it steady. Clamp the hose with the vice grips. Start the engine and allow it to stabize. Gently open the screw on the vice grip to meter the flow of the cleaner (it is a little tricky to keep the flow from getting too heavy). Gently increase the throttle if needed to keep the engine running. Don't allow the cleaner to go through too fast. Slower is better. When the bottle is half empty, shut off the engine and move the vacuum hose to the other port in the intake manifold and repeat the process until the cleaner is gone. Reinstall the original vacuum hoses.

If you want to see how well this is cleaning, before you start, pull the air intake tube off the throttle body and open the throttle and look at what you can see of the inner part of the manifold. After you are done, look again. And while you are there the second time, clean the throttle body. Follow up with another bottle of injector cleaner in the gas tank.

You will be amazed at how much better the engine runs.

If you still feel that you need to pull the manifold off for cleaning, try doing this first. It will most definitely make the job much easier.

hey david, I need to do this real bad i got 73k miles on mine, So im sure there pretty nasty. Maybe we could get together and do it on a weekend, Might make things faster if there are two of us.