problem please help me???

[JohnP]

thanks bobbit, i\'ve had a natter about it with hurley rotary and they think and hope it\'ll be a solenoid. trouble is theres more solenoids on this car than i have pairs of underpants... so i have a feeling it\'ll end up with hurley anyway

[Bobbit]

I had a similar prob and it turned out to be the 2nd solenoid back, £15 for a replacement solenoid (did a test to make sure it would work up to 15psi to be sure) and 2hr of work and i was done. My 2nd turob was hesitant and then stopped working altogether, this fixed it for me and i\'m delighted

[JohnP]

oh, and when i mean trouble boosting on the second turbo, it feels like the cars holding back/hesitent. it still revs smoothly and consistently upto 7.5k, but boost pressure drops back to bang on zero at around 4.5k. this is an intermitent fault, but when the car is really hot it has this problem more times than not.
 
and sorry for the triple post

[leon]

if your handy with a spanner and its not a daily car its a reasonable job to do yourself :Thumbs-up  pop the uim off and the dreaded rats nest stands before you:Laugh - as for the after 4.5k rmp that sounds like the 2nd turbo not kicking in what so ever! as bobbit did i replaced the solenoids and also the vac lines on mine as they were a little worse for wear (touched them and they crumbled)

[JohnP]

how do u diagnose which solenoid it is?

[Bobbit]

my diagnosis was to disconnect the CRV from the air intake and feed a hose from the disconnected end in through the passengers window. This let me know if it was venting boost when the 2nd tubby came online, it was and so i could tell the crv was not working. The 2nd solenoid back controls the crv and hey presto!

[JohnP]

i\'m a noob. whats a CRV?

[leon]

Charge Release valve.

[JohnP]

thankyou very much
 
are the 2 crv\'s identical?

[Bobbit]

No, one the ARV, Air relief valve and is different to the CRV, the crv is furthest back in the engine bay of the 2
have a look here for more info bud: clicky

[JohnP]

From 0 to 4,500 RPM with a vacuum applied to Chamber A, the Charge Control Valve stays closed, as Primary boost is always greater than a vacuum. Note, that the vacuum supply is from the Vacuum Chamber, thus leakage of the one-way check valve for the Vacuum Chamber will result in Primary boost applied on both sides of the actuator resulting in this valve opening when it should not, dumping Primary boost through the Charge Relief , Secondary Turbo and out the Charge Relief Valve. Another symptom of a leaky Vacuum Chamber one-way check valve is a loss of boost that is restored if the throttle is let off, (re-charging the Vacuum Chamber from engine vacuum) then quickly re-applying throttle results in boost.
 
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useful page, thanks

[Bobbit]

Nee bother!