turbo help needed

[MadcapMagician]

My turbo doesn't seem to be doing what it should. I don't think there's any boost.

The green light comes on when I start the engine but it never comes on whilst driving. I lose power in a big way when going up hills on the motorway - I have a top speed somewhere between 40 and 60mph depending on the steepness of the hill.

I'm fairly sure the turbo itself is working because you can see the actuator arm working.

There are no split pipes.

Before I spend lots of money on diagnostic tests etc, is there anyone near Letchworth that would let me try their turbo switch in my vehicle so that I can try and narrow down exactly where the problem lies? If it is the switch that's faulty I'll be the happiest man alive - I'd far rather spend a few quid on a switch than £200, £300 or £500 at Turbo Technics.

Can anyone help?

[BUSHWHACKER]

Check the short rubber pipe indicated in this pic, is still attatched, it can get covered in oil, swell and drop off causing loss of boost pressure.

[MadcapMagician]

Already changed it to no avail.

[NiftyNev]

Is the hose to Turbo Pressure Sensor connected?

Nev

[MadcapMagician]

Woohooooo!!!!

I've sorted it!

I was looking at both your photos and it suddenly struck me that the layout of your vacuum pipes was different to mine. Clearly, the plonker that had the beast before me had done something - three of the pipes were connected up wrong!

I changed them all round to match your photos and bingo! I now have turbo boost! It's like driving a different car!

Thanks guys.

[NiftyNev]

Here's a diagram of the 2L-TE Vacuum Hoses so you can check for sure that you got them all right.





1 - EGR Valve
2 - Vacuum Diaphragm
3 - Small Butterfly
4 - Bottom VSV Under Manifold
5 - Top VSV Under Manifold
6 - VSV on throttle Body
7 - Vacuum Supply From Vacuum Pump
8 - EGR Vacuum Supply
9 - Vacuum Diaphragm - Lower Chamber Vacuum Supply Hose
10 - Vacuum Diaphragm - Upper Chamber Vacuum Supply Hose
11 - Wiring Harness.

When throttle is opened Vacuum is supplied to 8 and opens EGR Valve. Vacuum is switched via Solenoid 4. Solenoid open when throttle is open and closed when throttle is closed. TPS is probably the source of the signal for this VSV to switch on and off.

Vacuum supplied to Upper Chamber of Vacuum Diaphragm when Ignition is switched off via VSV 6 which closes the Butterfly.. This switches off automatically a couple of seconds later allowing the Butterfly to return to normal open position. The source of the switching for this is the Ignition Switch and some sort of timer somewhere behind the dash.

Lower Chamber of Vacuum Diaphragm partially closes the butterfly when Vacuum is supplied via VSV 5. This operates at partial throttle to allow the flow of exhaust gases via the EGR Valve.

Note: The above is how it comes from the factory and does not take into account blocked hoses that will alter how the system works.

Nev

[MadcapMagician]

What does this black knob (circled) on the back of the switch assembly do? It's twistable like a rheostat.

[NiftyNev]

It just a filter for the VSV. It's just a press fit onto a retaining washer type thingy. Don't twist too much or it may break off. They are fairly fragile. If you look at the others for the ADD and also the ones under manifold they should all have one. Air is expelled and draw into the VSV during operation and the filters prevent the entry of dirt, dust etc.

Nev

[chardspm]

It just a filter for the VSV. It's just a press fit onto a retaining washer type thingy. Don't twist too much or it may break off. They are fairly fragile. If you look at the others for the ADD and also the ones under manifold they should all have one. Air is expelled and draw into the VSV during operation and the filters prevent the entry of dirt, dust etc.

Nev

My 1992 Surf was overhauled 5 months ago. I found out lately that this press fit was already missing. What will be the effect? How will i remedy this. Additionally, the turbo lamp does not light on though i hear the turbo whistling, is it related to the missing press fit?

[MadcapMagician]

Additionally, the turbo lamp does not light on though i hear the turbo whistling, is it related to the missing press fit?

Does the turbo light come on for a few seconds when you first turn the ignition key, or does it not come on under any circumstances?

[chardspm]

Yes, it come for few secs (same with engine red lamp) then off during ignition.
Also I want to add...the engine lamp is always on while i'm running.

[MadcapMagician]

the engine lamp is always on while i'm running.

Er.....I think you have problems!

[chardspm]

Er.....I think you have problems!

Any further advise what to do? Can I just leave the Engine Red Lamp that way?

[gmoncrag]

vsv filter

hey guys
just reading about turbo,s ect ect and come across a thread that shows a black knob, on the back of the switch assembly,
now some one has said its a vsv filter,
ive had a quick gander at mine and its not there just a pipe sticking out?!?!?
my question to you guys is.....
is it improtant?? (i do have loss of power goin up hills, thats why i was reading the thread)
where can i get a new one from??
is there a knack of fitting em ?? (just looks like you push it on)

cheers :@)

[MadcapMagician]

i do have loss of power goin up hills

Sounds familiar!