Need help in diagnosing Charge Control Actuator
 

Have a quick question as I am missing my primary boost. My Charge Control Actuator is not pulling the rod in when the car is on. I am guessing I have a leak towards the vacuum chamber.

I have a spare and when I push the chamber rod in, it says in. My question is should the rod be pushed out until the car is turned on then gets pulled in, or should the rod be pulled in from being off until 4,500 rpm.

Also wanted to add that the rod does not pull in when the car is on, stays sticking out.

http://www.autosportracetech.com/RX-...leshooting.htm
check out the section on the CCA. I just replaced mine, it was bad. I diagnosed it while it was off the car. You should be able to give 15ibs pressure to the B chamber and the rod should move out(I think) when released it should close. I hope that helps.

Rod will not pull the actuator in until the soleniod switches vacum from the storage tank. It does this when the ignition is turned on & stays that way util 4000rpm when the 2nd turbo comes on-line.

If you physically activate the actuator & cable tie it in the "closed" position, take the car for a spin & check if 1st turbo boost comes on....

If this is done while installed in the car, make sure your check valves are pointed the right way. Or maybe you have a leak inside the actuator that prevents it from working.

Off the car, the rod should move freely and the spring pressure in the actuator should be plenty to make the valve snap shut crisply. If it moves slowly or not at all, carefully disassemble the CCA valve assembly, clean everything, and put a little grease at the pivot points.

Dave

Thanks guys. My situation is that I have no primary boost and everything looks fine as far as check valves, pressure chambers and vacuums. Only in 5th gear do I get primary (8lbs). I guess at that speed enough air is being puched in. The only problem is that I push the rod on my spare TCA and it stays stuck in. Just wondering if this is how it should be.

no the rod shouldnt stay stuck in...i think you spare is sticking...(try oil it and play about with it)
How much do you know about the turbo system mate.. sounds like you onto your problem,,, if you start your engine and the rod on the control actuator is staying out then the passage between turbo's 1 and 2 is open,,,so all your boost from primary is going straight into secondarys pipework and out of the secondary releif valve. do u understand all this ? (i cant explain why you get primary in 5th gear,,, the gear ratio doesnt affect air flow,,,engine speed and air flow are the same whatever gear)

now for what the problem is,,,, check the vacume chamber,,, run the engine switch it off,,then pull the pipe of the vacume chamber (do u know whcih chamber this is),,, should vent air,,, if this chamber vents air,,then either the acuator is broke or sticking,,,,or the control solenoid that controls the actuator is faulty.

TCA? (I think you meant CCA).

All actuators (CCA, WG, PC, TCA) have an internal spring that should snap back when you push in the rod. All of them should resist being pushed 'in'. Any actuator that doesn't, is bad.

Dave

Sorry I meant CCA. I am aware about the springs within each (CCA, TCA, WG, PC) and the boost/vacuum relationship. just have to dive into the rats nest and recheck all hoses, check valves, etc. Thanks for the info guys just struck me as odd as I have boost in 5th Gear. Battled the CCA before (many years ago), and completely hate the system. Thanks again.

Before you start messing with the UIM,i would suggest to check the solenoids by grounding the appropriate pins of the wiring harness that goes to the ECU and hear if they "click".That method helps checking the solenoids either hot or cold without the "remove UIM-COILS-ETC hassle"....

Gotta remember that your 92 models are now 13 years old & these things are going to become more common. If its a moving part, even more so.....

A quick & easy way to check if vacum storage is ok, is to pull the hose from the vacum chamber (located near the front left of the motor) around 40 seconds after shutdown. If there is still vacum there, your problem may be the CCA itself.

Another problem that pretty much all series-6's (92-95) are getting now is rock hard & brittle vacum lines from the extreme heat in the engine bay. If you are losing vacum there is a good chance its due to this problem....

.

REgards

Thanks guys. Well aware of the brittle hose problem. Just did the nastyhose replacement not too long ago. Diving in this weekend to see if any hoses are off or possible crack in the chamber. Also I am wondering if selonoid F which sits on the second tier of the rats nest is faulty. Other than that, I cant seem to find any specific item that affects primary boost. Vacuumm is just not making its way to the CCA chamber.

Ill keep you posted.