i have a 95 wrx with td06 16g, pp chip, IK, 3 inch system with decat. all was running well until today. in all gears with foot down, i get boost to 1.1bar and car pulls well. i was in 4th gear and put the foot down when boost dropped off to 0.5bar.

After say 20minutes driving on 0.5 bar suddenly i get 1.1 bar again. 1st, 2nd 3rd 4th was fine then i boot in 5th and it cuts back to 0.5 bar. I had this problem briefly a week or 2 ago and reset ecu and all was fine.

took it for a drive tonight and im on 0.5 bar. what is going on.

No ecu codes when black and greens are connected. Boost solenoid cleaned out no black stuff coming out. 2.0mm restrictor in bottom port also fitted.

When i turn the key on you can hear fuel pump priming as normal, what should I be checking as i still get all the revs but just wastegate pressure 0.5 bar on boost.

Could my fuel pump need upgrading?
lambda sensors?
im starting to go insane - i gather the car must be sensing trouble hence dropping boost to 0.5 bar?

its not fuel cut where the car feels like its hit a wall the boost just drops really.

Thanks in advance lads

 

I have exactly same problem let me know if you've cured it iv also a 95 wrx with pp chip cleaned solenoid checked hoses but all symptoms are exactly same as what youve described Cheers pete

 

hmmm it seems like it a common problem but search is turning up the same threads.
any experts out there?

 

Yeah I noticed quite a few with similar symptoms but no answers come on experts please help

 

Evening Peter,
Did you fully delete the dodgy DV last time or have you still got it on but jammed shut?

You checked all the boost/vacuum pipes for splits and security?

Do you have any sucking/blowing noises?

If the restricor in the bottom BCS pipe has become blocked, that will cause issues, you could just remove the pipe as a test. (may cause over boost or spike)
Steve.

 

Sounds like it's just running actuator pressure

 

it's the fact that its intermittent thats what is doing my head in. I did notice a kink in the bottom hose out of the bcs and have rectified, within 10 miles or so back to full boost - again all was well when it happened again!!
i have connected the greens under the wheel and the bcs is clicking rapidly along with fans cylcing, is this normal?
I am going to try cleaning with carb cleaner in test mode see if that helps.

 

YYYEESSSS!!!!!!! a code came up.

4 long, 5 short. i gather its code 45 MAP sensor??

please please tell me all i need to do is replace it.

 

Yes it is actuator pressure.

Same as Peter, it's almost like an obstuction moving around the system, or a loose/split pipe that moves around under pressure.

Yes, when in 'test mode' most of the relays etc come in and the fans run.

Do you still have the original black boost/vacuum hoses to and from the BCS or have replaced them, and did you fully delete that DV?

Steve.


edit. Code 45 can be any of the 3 on that mounting plate, BCS, MAP or PES. The choice my friend, is yours.

 

steve.....read...the previous post quick!! i cant believe how excited im getting about seeing a fault code. good god why are motor factors open at this time on a friday night

 

45 is bgs map or pes matey

 

^^^^^^^^rofl

Yeah i see it, have edited my previous post.

The extra boost/power seem to see the weaker sensors off pretty quick. Pleased you got a code. Not as pleased as you though, obviously.

 

OK going to replace all 3. but what the hell is PES?

Must go and PM Mattybr5

 

This one

or

this one

Both the same seller but cheap at that price.

Might be worth PM'ing mattybr5, he has broken more classics than i've done miles.

 

How spooky is that, both post matty at the same time.

The Pressure Exchange Solenoid, it's the brown thing that sits on top of the assembly, the pipe comes off the MAP and joins to it.

 

a -ha.
hmmm spookiness between you and me seems to be cropping up quite a lot of late. what with you copying my engine bay and catch can set-up, now my thoughts. lol

 

 

the second one is no good as it uses a different map sensor and boost control solenoid, for a v3 onwards

 

Good job your here.

Yeah as my94wrx says Peter.

Please feel free to ignore.

 

Sounds to me as if the actuator is staying open and not closing properly?

I had the same symptoms on mine (well the boost never came back) found the actuator rod had actually come off the actuator leaving the actuator open all the time which only produced .5 bar

 

no probs

 

searched for answers to this for ages this should be made sticky lol or faq matty goin to get a few pms now cheers pete

 

are you sorted out now as well? or are you going to just buy all 3 as well.

I know what you mean about the search, you would think its a black art or something i even searched on sidc and nasioc

 

think im goin for all 3 aswell mate get it done all in one is the boost/map pack everything needed sorry if i sound thick car still throws things up i know nothing about after 4 years lol