Hi guys -probably another dumb question, but after I get the 2 bolts out of the IMT valve, what is the trick to breaking loose the plastic housing from the manifold? Mine seems to have melted itself on there. I hate to pry around or beat on it too much as I don't want to break it.

Thanks, Tim

 

Tim: Not a dumb question at all. The real dummy is the prior owner / mechanic who probably glued the IMT valve with liquid gasket. This thread may help you: https://www.jaguarforums.com/forum/x...t-seals-35784/

After loosening the lower IMT valve, you won't be able to fully remove it because the valve cover blocks the path. If you're simply installing a new IMT o-ring, no worries. The old o-ring will probably tear and break when you remove it. But the new o-ring is flexible enough to stretch over the electrical connector side of the IMT valve and into place.

If the IMT valve breaks, worst case is ~$26 for a used replacement. If the lower valve breaks, loosen the intake manifold to replace it (do this with the engine cold): Jaguar x Type 02 08 Intake Manifold Air Valve XW4E 9L490 Ad | eBay

 

My lower was INSANELY tight, even though it had no additional sealant. I just had to apply an insane amount of very careful leverage by hand. After tremendous force, it finally came apart. It didn't break or become damaged in the slightest.

 

The IMT o-rings are made of rubber and in some cases, the rubber will get soft when it gets warm and will fuse itself with the surrounding material. This is what makes the IMT valve appear stuck. I have found that if you twist the IMT valve slightly in its hole, you can get the o-ring to break loose and once you can turn it slightly, the valve will slide out with minimal effort.

 

Well dwclapp you were right: some previous moron had saturated those old o rings with gasket sealant. They were the original yellow ones and in bad shape, but they were buried in an unbelievable mess of sealant, which had pretty much glued the valve to the manifold. Thermo, your suggestion about "twisting the valve in it's hole" was what did the trick. By hand they wouldn't budge, so I got a big ol' set of vice grips and grabbed hold of the little housing where the wires connect and gently cranked it back and forth until it started to move. Eventually I was able to pull them out. The biggest part of the job was cleaning off the gasket sealant. But, thanks to you guys, the O rings are in and it runs smooth as can be. Of course it's 60 degrees now. In the morning it will be in the 20's, so we will see how it runs then. It's been running really rough on cold startups when temps are at 30 degrees or lower.

 

fox: Glad you worked it out, so to speak. I bet it now runs smoother in cold weather, not just because the new green O-rings are thicker than the factory yellow O-rings, but the new 0-rings are also more flexible.

Recall the Challenger shuttle disaster? Rocket gas leaked by O-rings that had become rigid on an unusually cold Florida night. Likewise, your old, factory yellow O-rings were stiff from age, and cold weather made the old rubber even more rigid. The flexible green O-rings should continue to seal well even when cold.

If you discover that your engine still runs rough when it's cold, let us know and will help you pinpoint the likely vacuum leak.

 

s

 

I have a question my car was having issues I read The Forum and you guys suggested that the O-rings for the IMT were could be faulty. So I tried that I went to AutoZone and got these old rings and they almost look too thin but I said it was for the vehicle so I put them on. After replacing the gaskets I go to try to start the car car will not start it tries but it can't turn over it's cranking but not turning over does anyone know what happened with this card do I need a throttle body?

 

[QUOTE=Sunshine47;2674009]I have a question my car was having issues I read The Forum and you guys suggested that the O-rings for the IMT were could be faulty. So I tried that I went to AutoZone and got these old rings and they almost look too thin but I said it was for the vehicle so I put them on. After replacing the gaskets I go to try to start the car car will not start it tries but it can't turn over it's cranking but not turning over does anyone know what happened does it need a throttle body. The original code that I got was p 01582 I believe stating that it was too lean. So I've already replaced the catalytic converter the oxygen sensors and injection sensors and now the IMT O-rings. The throttle body is original to the car I believe I don't remember ever changing it just curious if it's that or could it be the fuel injectors I have no idea can someone please help me out?