richie0270

Suddenly my 99 uk turbo has too much boost.
The boost gauge used to stop at 1.2 but suddenly it went to 2..?
Noticed it yesterday, all of a sudden?
I have not pushed it hard as I dont want to do any damage.
Any ideas or advice, I live on the Wirral, ch63.

Cheers, Richie.

mr_D

iTrader: (12)

over boost. check all vac lines and also try and give the boost solinoid a clean out. this may help

jr758774c

iTrader: (21)

Are you sure the gauge reads in Bar rather than PSI, as 12 psi is about right. Either way, you don't want to be hiting any higher boost without the relevant fuelling and ignition changes. Check all the pipes from your turbo nipple to your boost solenoid and then the pipe back to your actuator - Make sure they are all on tight and check them all for splits or leaks. If you continue to drive it hard with that boost, it will inevitably go boom!

richie0270

Thanks, Mr D, any pointers as to where the boost solonoid is?? And how do you clean it out?

scooby87

iTrader: (5)

Boost solenoid is on the drivers side suspension turret, it has 3 hoses going to it.

Clean with carb cleaner or similar.

richie0270

Thanks, just checked and I have what looks like an electrical control thing with a hose from the actuator and one from the inlet pipe. There are no leaks in the pipe work that I can find and also when I try to force air into the actuator there are ni signs of leaks. Is there a check for the boost controller? Could I disconect if and fit a manual boost controller??

Darc174

iTrader: (13)

Seems like a split VAC hose

darc

Splitpin

Something doesn't add up here. Boost cut on your car is 1.21 bar so there's no way you'll get to 2.something. If the wastegate actuator vac line had come off it'd just kangaroo around off the fuel cut threshold at 1.2 or so.

Unlesss... have you had a remap, or running a fuel cut defender or something like that? Tell us more about your car and it'll be easier for us to help you.

Also - can you post us some pictures of the turbo boost pipework and this "electrical control thing" you refer to? There certainly are more checks you could go through at the moment - now's not the time to be fitting a manual boost controller.

When the boost gauge started reading funny, did the car actually feel a sh*tload faster (and/or cut out suddenly)? If not, chances are your boost gauge has bust and is reading the wrong values.

richie0270

Trust me it goes up to 2...!!! and yes it went like **** off a shovel.! I did notice that it kind of cut out momentarily when it hit 2, but then it boosted up again straight away. There are no other mods to the car apart from boost gauge and dump valve and it has been running great for the last 18 months. I have looked for split hoses all over the engine bay but couldn't find any. It all runs fine at the moment so I am just taking it easy for now till I can sort it.
Thanks Richie.

andyxros

my99 should have a 2 port solinoid so if blocked it will just send air from outlet nipple to the actuator and run actuator boost depending what it is some one will know,,....id take of the small pipe from turbo outlet nipple to the tee piece and push the brass oriface out and cheak this for blockage as if air not passing this it will overboost, the hole is only 1.2 mm and can block up with oil

Splitpin

Okay, strange things going on here so a couple of questions to help us understand what you've got.

First of all you say the car's standard apart from the boost gauge and DV - yet in your first post you say the boost "used to stop at 1.2". Your car is an MY99, yes? Are you saying that before this recent weirdness started, the needle was holding at 1.2 bar under WOT acceleration?

If so the standard boost target on these is 0.94 bar with fuel cut at 1.22 so either way, at the outset, something wasn't "right". Either the gauge was over-reading or the car is running non-standard boost - or possibly a little of both. If it's running non-standard boost the question then turns to how this is/was being achieved, and secondarily whether any aftermarket gear in there might have gone wrong, causing what you're experiencing now.

The only pipes that should be significant to this are the ones between the turbo compressor outlet, the solenoid and the wastegate actuator, and, possibly, the ones between the inlet manifold and the pressure sources change solenoid, and the MAP sensor.

How long have you had this car and how much do you know about its history? Is it possible, for example, that it might have a piggyback boost controller and/or FCD fitted? Do you know which type of ECU it's got, or at least what colour the label on it is?

Oh - that "electrical control thing" - any chance of a photo or at least a description?

tjmatt

iTrader: (1)

What boost do you get if you put a new pipe between the compressor nipple and the actuator (i.e. without a T in it for the solenoid, but block up that spare pipe to the solenoid).

This should run actuator boost which is about 0.5 bar, and will tell you that the actuator isn't stuck/broken.

mr_D

iTrader: (12)

Splitpin it maybe what they are set at but sometimes this dont work. about 3 months ago i had an issue where i was going well over 2.5bar of boost! and i have a v3 sti. yet recently when i had a problem i was getting fuel cut at around 1.5-1.7.

i know what your saying and agree with you but it sometimes just dont matter.

there is a guide somewhere for cleaning the boost solinoid. in the faq part i believe.

tjmatt

iTrader: (1)

Also - if everything is standard even if the solenoid is stuck open the standard solenoid shouldn't be able to bleed enough air to boost to more than about 1.2 - 1.3 bar.

Splitpin

I know Mr D. Thing is, when they don't work, there will be a reason, and it's that we're trying to help Richie find and fix. Same with your car - there's a reason why the boost would have jumped like that.

richie0270

Sorry guys, it was reading 12 PSI not 1.2 bar, my fault. It suddenly jumped up to 18-20 psi. The car is totally standard as it was owned by a farmer since new and has more service history than your average library, and yes it stunk of cow **** for the first few weeks....!
I have driven it today and all seems weel apart from if I boot it the boost goes way up and the car cuts out momentarily, jerks violently, then comes back on, I only did this a couple of times as I dont want to wreck it but more to see what was happening. I'll go and check the hoses again and see if diverting the wastegate soleniod will do as tjmatt says.
I'll let you know.

Cheers guys.

dandruffe

iTrader: (1)

sounds like its doing the exact same thing as mine mate and i have no idea what is causing it.... keep us posted!!

Splitpin

Doh, knew 2 bar had to be wrong. Not to worry - at least we know now. These figures make sense - the standard boost target is just over 13psi so your gauge sounds reasonably accurate. Similarly the fuel cut is 17.8psi so again this fits what you're seeing.

That's fuel cut alright -and it's happening at the "right" pressure too so no big mysteries anymore. Your plan's the right way to go. If all the pipes check out and the direct connection between compressor and actuator gives you reduced boost as Matt suggests, give the solenoid a good clean and see where you get.

mr_D

iTrader: (12)

my bet is on the solinoid.

ay your right there is an issue! like the pipe with the pill in it was split on mine. but i still managed to hit 2.5+ bar of boost. put a smile on my face though

richie0270

Fantastic day today, took it to local scooby specialist where he diagnosed it to be excessive oil in the engine, clogged pipes and also the wastegate actuator solonoid was not working properly.
An hour later, some new pipes and a second hand solonoid valve and job done, fixed.
By the way he drained some oil and put it to the correct level.
And it only cost me £70.
Thank god for that and thanks guy's.

Richie.

DeanF

iTrader: (1)

I thought you were doing well to get 2.0 bar form a TD04

Dean