just a quick question guys
i was experiencing real sluggish boost in the first turbo and none in the second so i decided to replace all the hoses with new silicone ones.i checked all the solenoids with a 9 volt battery while i had the rack out they all clicked open properly except the third one in from the bumper i think its the turbo control solenoid,i i gave it a hard tap with my pliers and it came unstuck and worked fine,is it ok to put it back in the car and would that have been the cause of my boost problem??thanks

 

here is a diagram of the soleniods in the rack...

 

I would replace that one and the other turbo control solenoid that's mounted on the ACV. If either or both is sticking that will cause the symptoms you describe.

Also check on your check valves and make sure they aren't leaking.

Dave

 

sounds good thanks for your help man

 

I probably have an extra one if you need it.

 

I've got an entire rack of solenoids if you need them, too.

Also, I would do a heat/pressure test on them. The solenoids may operate just fine at room temperature at atmospheric temperature, but under heavy heat and pressure, they will either fail or react very poorly.

Heat them up by baking them. Then apply a fixed amount of pressure, based on whatever the drop pressure of your IC is (ex: Stock IC @ 10psi is around 2psi, thus 10+2 = 12PSI). This will basically simulate the actual conditions that it will see in the engine bay, thus saving you the headache of having to remove the UIM incase it fails at operating conditions.

EDIT:
One question though: How much turbo pressure are you running at the manifold? In my experience, even some new solenoids fail at turbo pressures which are more than stock.

 

You might want to look into Rob's (Saxyman990) solenoid kits that allow you to replace and move the turbo control solenoids from under the manifold. you end up with better solenoids that are very easy to get to for testing, tying in with gauges, etc.