Boost stops at 1.4bar - N75?

[220bhp]

Did you clear the codes after fitting the knock sensor

[UrS4boy]

I can't do boost leak test, as i don't know how exactly and don't have access to air line.

Come on!! That is BS. I have given you enough how to info including pointing you at a little 12V air compressor that would work and you still are AFRAID of doing this? Makes no sense.

[Rikki Kitto]

Have you ever watched a dog chasing it's tail for hours and hours, it's the same as boost leaks without a test, nightmare I've been doing it for about a year now since my engine swap😳😣😔

[geneandbolly]

Come on!! That is BS. I have given you enough how to info including pointing you at a little 12V air compressor that would work and you still are AFRAID of doing this? Makes no sense.

hey professor plum, give the guy a break! just because you've been into this stuff for years, don't go bursting his chops because he's a novice!

some teacher you are!

[hunker7]

Come on!! That is BS. I have given you enough how to info including pointing
you at a little 12V air compressor that would work and you still are AFRAID of doing this? Makes no sense.

Yes maybe i am afraid, but i do not know if i am doing it righ, i might be doing it wrong, and think oh look no leaks. You told me there ahould be judder or power loss if there is a boost leak. And boost leak won't just appear over night, cos that's what happened.

Did you clear the codes after fitting the knock sensor

Knock sensor didn't come up, i just wanted to re torque them, and then noticed it's gone. I'll check for errors.

[Rikki Kitto]

Any fault can appear over night including boost leaks The joys of running 20 year old motors

[220bhp]

Beg borrow or steal a compressor of some sort. then try and do a leak test, using some soapy water spray . If at first you don't succeed Try again, preferably using Daves detailed instructions. At first it may seems a task, but when you have the mind set it becomes easier. One thing is for sure, and trust me hear. If you do not work through things in a systematic way you will never solve your problem.
These cars Can be a pain to get right, but the reward when they run right is worth it.
So don't loose hart, just bight the bullet and do as people advise. and you will get there.
Best of luck and keep at it.

[K Simmonds]

Beg borrow or steal a compressor of some sort. then try and do a leak test, using some soapy water spray . If at first you don't succeed Try again, preferably using Daves detailed instructions. At first it may seems a task, but when you have the mind set it becomes easier. One thing is for sure, and trust me hear. If you do not work through things in a systematic way you will never solve your problem.
These cars Can be a pain to get right, but the reward when they run right is worth it.
So don't loose hart, just bight the bullet and do as people advise. and you will get there.
Best of luck and keep at it.

That's some really good advice, as long as you don't throw stones/tools into your pipe work or try to make the system hold over 1.5 bar your really can't go wrong. Hell, even if your leave the PCV system connected by mistake the worst that can happen is that it smokes for a couple of miles.

I put mine back together very carefully with new parts where appropriate and I thought I had no leaks till I tested it properly and discovered a few small ones. Tweeked a couple of clips and hoses and the car felt all the better for it, it's now holding 1.9 bar and I'm going to test it again very soon due to the extra pressure on the system.

[newsh]

Shame the knock sensor didn't fix it but it would have given you problems so good that it was found!

Here's another quick friday night thought for you. Get a fried to sit in the car and push the throttle down, then look at the throttle body and see if there's any slack in the cable, can you open the throttle any more by hand? Maybe the throttle is not opening all the way so you're not getting full throttle and therefore not getting full boost. You can adjust the slack out with the clip on the cable, at the bracket on the inlet manifold.

If you could get your car to me here I would leak test it for you.

[gavs20v]

I have a compressor , air line and boost test kit and work in Edmonton ( nth London ) only problem is I'm on holiday for a week from Tuesday .
I f you want to borrow it let me know , failing that wait till
I'm back and I'll do it with you
Gav

[AndyP]

If you ever come back up to Leeds, give me a shout and I'll help you leak test it

[hunker7]

It does seem like a boost leak, as yesterday managed to squeeze 0.8 bar at 100mph. gavs20v you got a PM

[mike74]

Have you checked the altitude sensor yet? My boost went from 14psi up to 19/20psi just by adjusting that alone

[hunker7]

Have you checked the altitude sensor yet? My boost went from 14psi up to 19/20psi just by adjusting that alone

Where is that monster? Also when i rev it and let it go the inlet pipe pulses if you know what i mean.

[Val]

Under the carpet near ECU.

https://www.google.lv/url?sa=t&source=web&cd=2&ved=0CCMQFjAB&url=http%3A%2F%2F12v.org%2Furs%2FAANEngineHarnessPassengerSideV2.pdf&rct=j&q=aan%20altitude%20sensor&ei=qwDxU8gp6_jJA7rAgIgB&usg=AFQjCNGub8IAq1mZ0EK9fhCg7tKS67hW_w&sig2=CsU-HVXppZkc7sd_CXUQwQ&bvm=bv.73231344,d.bGQ