jaj1

I'm hoping someone on the forum can answer this question.
According to DVinitmars turbo troubleshooting site he has a simple
test for the charge control actuator.

"A simple test for the Charge Control Actuator is to start the engine and let it idle, the actuator rod will be pulled in. Stop the engine and remove the hose from Chamber A and the actuator rod will be out."

My problem is after I turn off the engine my actuator rod is out! I do not have to
unplug the hose from "Chamber A" to move the actuator rod out.

When the engine is running the charge control actuator rod is in as it should be.
I have both pressure and vacum holding in their respective chambers after shutting
down the engine.

So, does the charge control actuator rod move out after turning the engine off or
should it be in after shutting the engine off and only move out upon removing
the hose to chamber A on the charge control actuator?
Now, if the actuator rod does infact move out after turning off the engine, what could be some of the possible causes to look at?

Thanks
Any and all feedback welcome.

John
93 Blk Touring 97,000 mil, 7,000 of that on reman engine.
DP, RB Dual CB, Light Flywheel and Clutch upgrade, Eibach Springs, Tokico 5 way

jaj1

Can someone with a working stock sequential turbo setup verify if the charge control actuator rod is "in" after the engine is shut off?

Thanks

speeddemon7

Im not sure which way its supposed to be.More importantly what problems are you having? are you losing all or most of your boost at transition?

jaj1

Speeddemon,

I have been working on a few turbo boost problems.
I have the classic problem of low secondary boost in 1st and 2nd gears
and normal boost in third gear. My vacum chamber was not holding vacum
after a turn the engine off also.
Yesterday I pulled the UIM to investigate. I found a cracked silicon hose
that leads from the charge relief solenoid on top off the rats nest.
I replaced the hose and put it back together. I then tested to see if my
vacum chamber would hold vacum after turning off the engine and it did,
but my charge control actuator rod still moves out when I shut off the engine.
Today I have remove the UIM again and I am in the process of replacing both
turbo control solenoids. So I am still wondering if the charge control actuator rod
is suppose to stay in after turning the engine off or not.

Thanks for the input

John

jaj1

Well, I have replaced both turbo control solenoids and the charge relief solenoid.
I am still having low secondary boost in 1st and 2nd gears.

Does someone know a test proceedure for the turbo control actuator?
If I "T" into the vacum and pressure lines at the actuator and take it
for a drive what readings should I see? Also is there a test proceedure for
the turbo control actuator using a Mityvac?

BTW I am now of the opinon that the charge control actuator rod does move out when you shut off the engine. I preformed the 6 times KOKO test and the charge control actuator rod moved in and out each time.

I hope someone out there can help.

Thanks

jaj1

dgeesaman

iTrader: (7)

The test for the TCA and CCA can be found in the Mazda service manual. The section is titled 'Emissions control' or something like that.

Download from
www.iluvmyrx7.com

jaj1

dgeesaman,

The test in the service manual for the turbo control actuator seems
very incomplete to me. All it seems to test is the pressure side and
not the vacum side of the actuator. That is way I was wondering if someone
on the forum could tell me what readings I should see if I "T" into the vacum
side of the acuator and take the car for a drive and do the same on the pressure side.
There needs to be a balance between the vacum and pressure sides of this actuator
for it to work quicly enough to allow secondary boost in the lower gears.
So I will ask again if someone knows what pressure and vacum reading should
I see from the turbo control actuator at transition?

thanks

jaj1

thestaton

I am currently diagnosing a similar problem. However I did get to observe a stock 93 the other night just for this reason. And on his car the rod pulled in on KO. And when he did KOff the rod moved back out and his car was driving just fine. So I to am wondering the same thing.

dgeesaman

iTrader: (7)

Well pressure on one side = vacuum on the other. Testing one tests both. However, I agree it's not a very precise test.

I believe you're looking at around 10-12psi on the pressure end, and the equivalent (15inHg?) vacuum on the other. I believe that's the full values for the pressure and vacuum systems. At 4500 both should be full value. Based on my reading though, I can't confirm that.

I will look into it if I have the chance, but I think the answer lies in a search or get one of the experts to chime in.

dgeesaman

iTrader: (7)

That's what it's supposed to do. From the Vanditmar's site:
"A simple test for the Charge Control Actuator is to start the engine and let it idle, the actuator rod will be pulled in. Stop the engine and remove the hose from Chamber A and the actuator rod will be out, see also Boost Test Step 5."

Dave

jaj1

Dave,

I believe the confusion with the simple CCA test on Vinitmars troobleshooting site
is this.
When you turn the engine off with the key in the off position the charge control
actuator rod moves out you do not have to pull the vacuum hose off "chamber A"
for the rod to move out. Now if you turn the engine off and have the key in the
"on position" the rod is "in" and now if you remove the vacuum hose from "chamber
A" the rod will move out and you will hear air rushing in to fill the vacuum.
I don't think that the rod will stay in with the key in the off position.
If I am wrong someone please tell me.

Thanks

jaj1