Stuck in VOD for 30sec +

[Rosssub]

Yes BBOD holds vacuum, I\'ve had it out 3 times now and always reconnect and double check the vac feed hose. Everything works fine with the green diagnostic plug connected and ignition on.

[Eight_dollar]

if everything works fine - ie ICV , ECV etc while in "D" check

Then you must have a mechanical issue

[Rosssub]

I\'ve been using D check with ignition on but engine off, all solenoid are switching, ICV is opening and closing and I can hear the vacuum/pressure switching from top to bottom hose on the ECV acuator. Should the ECV rod move from open to closed in D mode with the engine off?

[telemekas]

Yes.

D check mode cycles the stored vacuum (vacuum tank) to move IACV via line No:1 (vacuum to close it) and move the ECV (bottom port) via line No:6 (vacuum to open it)

[Rosssub]

Just tripple checked the ECV in \'D\' mode, is working correctly. Opens about 30mm with initial, then less and less each time it switches as the vac tank loses vacuum.

[Marky]

im out of ideas

lock it in parallel - literally takes 10 mins, i put a how to in the faq - should make full boost around 4500 "ish"

anything later - like the 6k you have - and id think sick turbo

This is a weird one, best bet could be trying a second bbod if you can find one - might be a solenoid in there like you said not seating right or only failing when theres heat / pressure involved

[Rosssub]

Just been reading your how to on the parallel thing Marky. If hose 6 partially opens the ECV for prespool then hose 5 positive pressure opens it fully, maybe my ECV positive pressure solenoid in the BBOD is faulty (not opening fully) and not letting boost pressure through to the top of the ECV actuator. So therefore under full boost on secondary my ECV is only partially opening?

Inside the BBOD:

Hose 2 feeds positive pressure to the ECV positive pressure solenoid, which then bleeds through the ECV duty solenoid into hose 10. Between the two solenoids is a \'T\' which feeds to hose 5, to the top of ECV actuator.

So today I\'ll borrow a mates compressor again, I will block off the ECV duty solenoid. While in \'D\' mode I\'ll put compressor (15psi?) through hose 2 into BBOD to see if the ECV positive pressure solenoid is working properly.

[Eight_dollar]

100% sure the ECV rod and lever are actually moving the valve ?

These arent uncommon to part company and not work internally

system opens ECV ( but it doesnt internally operate even tho the rod moves ) at which time the IC inlet valve opens

= no sec boost, all primay boost on the twin stage is lost thru IC and out sec turbo

[Rosssub]

 Eight dollar said:

100% sure the ECV rod and lever are actually moving the valve ?

These arent uncommon to part company and not work internally

system opens ECV ( but it doesnt internally operate even tho the rod moves ) at which time the IC inlet valve opens

= no sec boost, all primay boost on the twin stage is lost thru IC and out sec turbo

Yes, I can hear the valve slapping shut when I move the rod with it disconnected from the actuator.

My primary boost is responsive and stable at 12psi, if the ECV valve was loose/open on primary my boost would be slow to rise and unresponsive.

[Eight_dollar]

yes if partially open ECV during primary boost the slow spool would result

I was asking if it was opening - you can hold it open and feel the heat warm the sec turbo in the shop as a good test

Also when in D check is the IC intake control valve operating?

You can run in D check with car idling - so have good vac source to keep systems operaing while you check them

Is pressure being applied to hose 8 while in extended VOD period?

[Rosssub]

 Eight dollar said:

yes if partially open ECV during primary boost the slow spool would result

I was asking if it was opening - you can hold it open and feel the heat warm the sec turbo in the shop as a good test

Also when in D check is the IC intake control valve operating?

You can run in D check with car idling - so have good vac source to keep systems operaing while you check them

Is pressure being applied to hose 8 while in extended VOD period?

No I haven\'t tried holding the flap open with car running, spose I could put vac to bottom of actuator (hose 6) to open it to see if the secondary turbo warms up?

While in \'D\' check the ICV valve is operating properly.

Hose 8: vacuum opens the secondary relief valve, tested it yesterday. I could hook a vacuum gauge in line 8 to see if its doing anything?

[Eight_dollar]

hose 8 - vac opens for pre spool and then pressure shuts it like any BOV to hold it closed under boost.

You tried blocking the boost side ot the BOV alrewady so wont be an issue here

Thinking about it

t can only be one of few items to be as bad as you say it is

Primary gate being held open during twin stage? siezed or plumbing issue

Sec turbo not making any huff

or massive boost leak

[Rosssub]

Ah of course, hose 8 is controlled by \'supercharger pressure relief valve#1 solenoid which can switch from boost to vacuum.

Boost from hose 3 through \'supercharger pressure relief valve #2 solenoid

Vacuum through vac hoses from vac tank.

But yeah, tried blocking secondary relief valve shut yesterday so not my issue.

I\'m still thinking ECV only slightly opening due to no positive pressure hose 5 from the ECV positive pressure solenoid being stuck or sticky,

[Rosssub]

 Eight dollar said:

hose 8 - vac opens for pre spool and then pressure shuts it like any BOV to hold it closed under boost.

You tried blocking the boost side ot the BOV alrewady so wont be an issue here

Thinking about it

t can only be one of few items to be as bad as you say it is

Primary gate being held open during twin stage? siezed or plumbing issue

Sec turbo not making any huff

or massive boost leak

If the primary gate was held open (seized or plumbing issue) would I still get 12psi Primary and eventually 16psi secondary?

I\'ve blocked the air intake with a vegemite jar and put compressor into BOV hose and the system is holding pressure, is there another way to test for boost leaks?

So it\'s starting to look like the secondary turbo is nackered right?

[Marky]

sort of, buuuut that wont explain why it gets "stuck" in parallel mode either

thats the part i keep getting stuck on, just been under my bonnet trying to think of what could cause what you have - i just come back to a solenoid sticking making ecv stay open or partly open at least

when it gets stuck in vod land, and it takes ages to switch back - if you just turn the car off outright, does it come right when started again? does it stay parallel right down to idle rpm?

theres only a limited number of components which can cause this issue and youre ruling them out one by one at least

[Rosssub]

I\'ve just tested my theory on the ECV positive pressure solenoid by \'T\'ing a compressor and a boost/vac guage through hose 2 into BBOD then blocking hose to ECV duty solenoid, while in \'D\' mode. The ECV positive pressure solenoid is definitly opening, closing and sealing.

If I change from 1st gear near 4000rpm I lose all boost, boost wont come back till I get through to late 4th gear.

If I near red line it in every gear, boost is instant and stable till 4000rpm then drops to 0-3psi. At 5000rpm boost slowly rises till 16psi at around 6500rpm. Same in every gear.

[funkytown]

id be doing the 0-3500rpm test and after a while checking the temp on the 2ndary turbine. easy to do and rule more things out

[Rosssub]

Just did the 0-3500 test, boosting on pirmary for 5 minutes. Primary turbo burnt my hand, but the secondary turbo is cooler than the engine. So ECV is definitely closing.

[Marky]

so... when it switches to vod - and you shift - if you just leave your foot off the pedal, or drive sedately, does it switch straight back? normally theres 3 sec delay or so unless you keep your foot down

Its not just that it is staying in twin cause youre at full throttle is it?

sorry if its a dumb question but ive seen some ecus that are especially "bad" and will err towards always keeping it in twin basically from when it goes vod until you back riiiiight off the loud pedal for a couple seconds and/or get under 3k ish

[Rosssub]

Nah either way it still gets stuck in VOD, full throttle or back on with light throttle makes no difference. I\'ve been watching the boost gauge like a hawk and when it hit\'s vod the boost is dropping right to 0 before it starts climbing again.

[Rosssub]

Inside BBOD hose 11 goes to MAP sensor, hose 12 is vac feed for vacuum tank/ECV/ICV etc.

If I\'ve got 11 & 12 the wrong way and that is a one way valve (because its not working), Then all my BBOD vac accessories will be getting boost instead of vac during/after VOD, because hose 12 (vac feed) is going straight to manifold.

I know I\'m clutching at straws but does that make sense?

[Rosssub]

No, found the one way valve lol.

[Eight_dollar]

Wind the clock back - when did this fault start or first noticed?

What had been done to the car prior?

[Rosssub]

I brought the car just over a month ago, HKS sequential BOV and sard vac hose kit. Drove it 300km home no worries. Joined this forum and realised it was boosting low on primary and secondary. I cleaned out the primary duty solenoid (full of sludge) and boost went up to 12psi primary and 16psi secondary. It lasted maybe a week going strong, then out of nowhere secondary boost was lacking again.

Since loosing secondary power the HKS BOV started leaking under primary boost, So I removed the sard double \'T\' hoses from manifold to BOV to hose 10, and fitted a straight hose with restrictor pill from manifold to BOV (hose 10 mod)

[Eight_dollar]

Put it all back to OEM

Recheck restrictor pills

Apart from that your sec turbo sounds FUBAR, But you have checked it ?!?

Drop the down pipe and check the turbo