Strange but true.

As seems common the car has run at 7psi from the day I picked her up. ECU check gave code 34 and a relocated Det Sensor fix that. Still code 55 and still 7psi. Have checked all the pipes around the battery etc all fine...

Any other ideas chaps...

She goes in for an overhaul soon, time belt, water pump etc..so if I can not sort by then will ask Phil at C & S wood to sort...

Have you checked for boost leaks ? :smw:

First off, what are you using to measure the boost - the stock guage isn't exactly accurate ;) If you ARE using an aftermarket guage to read the boost, its possible that your temp sender is faulty. Even simpler would be that the car had been previously fitted with a boost controller which has now been removed. When you fit an aftermarket boost controller you disconnect the stock boost solenoid valves, which are what the ecu uses to increase the boost to 9psi from 7psi(safety boost/warm up boost). The stock solenoid connectors are down the sides of the engine pretty much directly above the turbos. The passenger side one is attached to the high pressure pipe off the turbo as it runs alongside the engine (look next to the dipstick) and the drivers side is the same but on the vertical part of the pipe (although when they are disconnected they are not usually put back on their mounts). The connectors are square in shape and black.

 

CheerZ,

 

Andy

Grab a hold of each boost hose at the ends when the engine is well warmed up and twist it a little to see if it moves on the pipe connection. You might find one not totally tight and this can be enough to let go the extra few lbs of boost.

 

Think of that extra oomph you've yet to experience!

Thanks, few things for me to check tonight.

I have gone over all the pipes etc so the favourite is that it may have had an aftermaket controller. I'll check this first. Thanks chaps.

Oh and I have an aftermaket Guage. Reads bang on 7psi until she's realy wound up then creaps to 7.5/8psi but never reads 9. Does sound like a leak somwhere, its just finding the f-er!

if you had a leak my guess is that when the car is cold it would be reading a little under 7psi.

Wouldn't know that, never thash her till she's wet.

 

Sorry I mean warm.

 

:D

hmmm, a relocated det sensor - just a thought.

 

if the sensor is relocated, it *could* be picking up false signals, it may be thinking its detting & lower the boost.

 

this wont give an error code as the det sensor circuit is good.

 

like i said - just a thought :)

Originally posted by Paul C

hmmm, a relocated det sensor - just a thought.

 

if the sensor is relocated, it *could* be picking up false signals, it may be thinking its detting & lower the boost.

 

this wont give an error code as the det sensor circuit is good.

 

like i said - just a thought :)

 

.....and a damn good thought at that!!! This is probably what the problem is - you need to see if the stock solenoids are getting the signal to open for full boost.

Do the solenoids pulse or stay open for full boost, just a thought but could you bypass them?

 

Anyway, going looking at her to see if there's signs of her having boost controllers in the past...

They stay open - Just get a volt meter across the connector and go for a drive. Full working temperature, foot down, does the voltage go to 12v?

Cant you verify the sensor by taking it out of the equation and shorting with the 1 megohm resistor or whatever the det healthy resistance is?

 

At least if the boost goes up higher you'll know you have a det problem or a det sensor problem

The Det sensor is ok. Code 55 still.

I found a black plug (near the dip stick) like the brown and black ones, that was unplugged. I've put this back but still 7psi. Not had chance to check the ECU for error codes sinse. I'm at C&S tomoz so will let them sort mi thinks. May cost me but at least she'll be sorted once and for all. I just wanna drive her standard for a bit before I start tweaking anything. Beleave the best way.

 

Cheers for all yeh help and I'll post any relivant info re outcome.

 

CarCrazyDave

LOL you found the problem!!! You were so close to sorting it - you just need to find the other black connector on the other side and plug it back in! That is the connector for the stock boost solenoid - there's one on each side, unless they are both connected, the turbos will still only achieve around 7psi ;)

 

HTH

 

CheerZ,

 

Andy

The one on the other side is already connected............

 

Boo hoo:confused:

 

Still 7 P igin S odall I nduction (PSI)