HenkeLindbom

Hi!

I'm from Sweden so excuse me if my spelling is bad or if you have trouble understanding what I mean!

Anyway, I have a boost problem with my FD. From 0-4500rpm I have no boost. I can hear my turbos boosting by the sound. It starts at about 2500rpm and gets louder and sounds as eihter one of the turbos is boosting way too much! At 4500rpm the sounds stops and the car shoots away like it should!

I guess the boost is escaping through the charge relief valve but why? I have changed all the vacuum hoses, check valves and the solenoids for Charge Control & Turbo Control.

If I do a KOKO test my charge control actuator pulls in and out like it should but my turbo control actuator stays in!

A while ago I could remove the check valve for the Charge Control solenoid so I could hear air going in and then put it back togheter. The car would then run like it should and the primary turbo boosted OK and I could hear the Air Bypass valve opening when I let off the gas.

But when I went pass 4500rpm the secondary turbo came in just as it should and after that the car was just the same as before, boost leak from 0-4500rpm!

I'm also having trouble with my idle as it has problems staying alive if I rev it up a bit. After a couple of seconds it stabilizes..

What do I do next?

//Henrik

HenkeLindbom

Maybe my turbo control is flowing my exhausts to the secondary turbo causing it to spool up too quick and too much making primary loose boost?

HenkeLindbom

When my car is on idle the Turbo Control Actuator rod is in and stays in even if I turn of the engine. When I taka away the check valve for the Turbo Control Solenoid #2 on the LIM air gets sucked in and the rod is out! Is my TCS#2 failing?

dgeesaman

iTrader: (7)

On KOKO the TCA actually changes position for a split second only. You need a helper to see it. Are you seeing good vacuum and pressure stored in the pressure and vacuum tanks?

I would also take every opportunity to make sure things are plumbed correctly.

It's possible your turbo control solenoid (or solenoids) are leaving the TCA suck wide open. This would prevent the primary turbo from getting enough exhaust to charge up fully until both are working together. Or you could simply be seeing the charge control valve hanging open. But I don't want to spin too elaborate of a theory without a little more evidence.

BTW your english is much better than average here. Much better.

HenkeLindbom

I did had a helper who turned the key while I was under the car but I couldn't see any movement.

I've got an European FD so my vacuum doesn't look the same as on the pictures I find on the web, don't know where to look next as my Mazda dealer didn't have anything either.. That's why I'm not sure if everything is is connected the way it should be..

My vacuum tank can hold vacuum over night but my pressure tank doesn't! I have changed all the one-way check valves multiple times but it doesn't help.

I have already changed the Charge Control solenoid and the Turbo control #1solenoid that sits next to each other but that didn't help either.

I guess I just have to remove the UIM again and this time check the TCS #2.

backwood

Hey I have the same problem and like you say the diagrams are different here to what I have under the bonnet. So at the minute I'm just taking everything out and replacing all the hoses. I have one solenoid that is defo down, so that was a good start. I'm also taking the turbos out cos I have an oil leak that I need to get a look at. So hopefully I can check most stuff on the bench and then I'm gonna check the wiring looms as I think I might have a few problems there too.

HenkeLindbom

When the Turbo control actuator rod is pulled in, is it closed or open? Mine is always pulled in. I have changed charge control, turbo control & charge relief solenoids but there is no change. I would like to change the turbo control solenoid #1 on the LIM but I haven't got anyone right now.

Also my idle screw, the one under the elbow, was fully in so I turned it out 1 turn but that didn't do anything to my idle problem..

rossc

You may have to turn your idle screw out many times. Keep on turning it until you hear (or see) your RPMs start to rise just a little. Don't be afraid to turn it out up to 10 full times (you can always turn it back in after).

If your turbo control actuator is in (aka into the turbos) then that means it is open and exhaust is allowed to flow to the second turbo. This is most likely your problem. I bet if you test the solenoid, it will fail. If you disconnect the pressure or vacuum lines from the turbo control actuator, you will notice at least one of them is holding pressure or vacuum after the car is turned off. If you then hook them back up and take it for a spin, you will probably have normal boost on the first run through the entire RPM range, but the next pull you will likely get little to no boost.

gracer7-rx7

iTrader: (16)

Did you check the rubber hose from the turbo to the ACV/BOV? They sometimes split open.

As for the idle screw, if all of the throttle body mechanical settings are all adjusted properly you should not need to go much beyond 1-2 turns.

HenkeLindbom

I disconnected both hoses to the turbo actuator and then hooked them back but the problem was the same even on the first run.

If I hold hold it at aprox 2000rpm the engine sound changes from smooth to rough every 1.5 second or something..

I have tried to put 12v on the solenoids and they open and close as they should..

HenkeLindbom

I'm not sure how to set the idle.. Is there any how-to anywhere?

If I go past 4500rpm the secondary turbo kicks in as it should and if I then let of the gas and cruise down to about 3500rpm and then floor it again I have boost but I think it's just the secondary because I can't feel any transition between first and second turbo.

When in neutral and WOT up to 5000rpm, should either of the turbo control or pre-control rod move? Mine doesn't..

HenkeLindbom

Today I got a 2-8-10 run så the primary is boosting but not much! After a run I waited about 5 minutes and then disconnected the check valve from the pressure chamber, it was empty! I have tried 3 different checkvalves and 2 different solenoids for the Turbo control, maybe I'm so lucky that all of them was failing?

Last time I checked, the Turbo control actuator rod was pulled in even with the ignition off and the day after it was half-way out event though I haven't touched the car..

I'm going to get another check valve and another solenoid tomorrow and change them AGAIN and hope for the best!

Now I'm going home to have a beer and drown my sorrows! Cheers!

dgeesaman

iTrader: (7)

I would find a mityvac and tee fitting and use it to find the source of the leak.

You do have the check valve set so the arrow points toward the pressure chamber, right?

Dave

HenkeLindbom

Yes I've tried to get hold of one of those but haven't found one yet.. The check valves are flowing in the right direction, trust me I've checked them many many times!

Funny thing is that 3 of the check valves are brand new and that's why I tought they would be fine but you can never be sure.

dgeesaman

iTrader: (7)

There are many places other than the check valve where things can leak.

Dave

HenkeLindbom

I tought so too and I've checked the pressure chamber and it doesn't leak, I've tried 3 different turbo control solenoids.. When the ignition is off, the solenoid should be closed right? If so, there could only be the pressure chamber, check valve, hose or solenoid that's leaking? All new hoses..

Going to sleep now so I can get up in the morning to work on the car.. Close call between Canada-Sweden..

HenkeLindbom

Now I think I can be sure that it is my Turbo control soleniod #1 on the LIM that's failing! I put screws in the hoses for the Turbo Control Actuator and my primary turbo boost just as it's should! That's the only solenoid I haven't changed and I don't have another right now but next week I'm going to get one! I hope this will fix my problems!

kiwi fd3s rs

Did you sort your problem out? Im having similar issues but my primary turbo is boosting about 5 or 6 psi then takes of at 4500 rpm to 10 and hauls ***. What solenoid was faulty?

HenkeLindbom

Yes it was the Turbo Control solenoid #1 that sits alone on the LIM. Previous owner had mounted a Purge Control solenoid there and they aren't the same.

kiwi fd3s rs

Sweet, think ill try going down that path first cheers

grego7

iTrader: (3)

Do you have a part number for the solenoid you replaced? There are so many, I don't want to get the wrong one.