The intercooler pipe that comes off the y pipe has dark residue(probably oil) around the coupling and the intercooler part. Is this normal for it to get that dirty. I do has some very very light to no smoke during idle. Greyish blask,barely see it. I also have had some metal on metal sound from shifting from 2nd to 3rd on a hard shift. Not everytime though. Today i noticed that intercooler pipe that connects to the y pipe was sticking up a bit,so i just pushed it back down,and it went down a 1/4 of a inch maybe. I have weird boost problems. No boost in first unless i get on it hard. all the other gears are fine execpt the secondary turbo doesn't kick on till 5,000 rpms is this normal. Ithought 4,500 was !

 

A little bit of oil on the inside of the intercooler piping is normal, just cus of oil spewing from the turbos. So I guess if the coupler is loose, maybe oil could come out of it? Clean it up, and reinstall it tightly, then see if more appears.

Do you have a digicam? Can you take pics of it?

As for the "wierd" boost problems, what's the pattern? The secondary should kick in at exactly 4500 rpm, and slow kick-in is usually indicative of a non-functioning TCA (turbo control actuator) or one of the vacuum/pressure solenoids/chambers that control it. Best thing to do is go piece by piece and figure out what it is, good troubleshooting link here http://www.autosportracetech.com/RX-...leshooting.htm

 

I had the same problem and yes is was leaking out of the coupler and then dripping down and causing quite a bit of smoke after hard driving. after going through 3 factory couplers in a short period of time (all of them used but in very good condition), i switched to the silicon couplers from the rx-7store. they fit perfectly, are $14 a piece (less than i paid for the used couplers) and haven't failed yet and they've been on there longer than the time it took for 2 couplers to fail. oh yeah, the oil leak is gone now too.
andy

 

Sounds to me like thats your issue Silverflash. Give it a shot.

 

Thanks for the replys i'll definately get some silicon couplers and give that a try.

 

Solve the problem completely and switch to an Efini Yipe. The rubber coupler is eliminated, and the crossover pipe is bolted to the Y-pipe via two flange bolts. This is guaranteed not to fail. Although the $14 Samco coupler might do the trick for the stock US spec FD Y-pipe. You just need to torque the **** out of it to be sure you've got the silicone coupler on TIGHT!