Boost Solenoid

Hi guys im having problems with the boost solenoid, somedays i can get full boost no probs go back out later and get what feels like fuel cut at around 3500/4000 rpm and check engine light comes. it throws up code 45, ive changed the solenoid with a spare i had still the problem remains, ive also cleaned the solenoid still no better, also each time resetting the ecu. The solenoid clicks when you start to open the throttle which i believe is normal so well confused now.

Cheers Andy

code 45 is map sensor bud, manifold absolute pressure
next to the solenoid, has small aprox 4 inch long piece of vacum tubing going to it
Andy

You haven't changed the hose that comes out of the bottom of the solenoid to the resinator box have you?

This pipe has a restrictor pill in it, if you remove it you will get this problem, it can also get blocked so give that pipe a clean out with some brake cleaner too.

Good point Andy!

Cheers lads, ive had a look on a couple of sites 2 say solenoid and 2 said map so went back out and changed that aswell the bottom pipe has the restrictor in it but havent yet cleaned it.
After changing it i resett the ecu again took it for a blast the light had'nt come on but checked for any codes when i got back and 45 was still there.

Andy

ya mte not of cleared ecu memory properly, leave battery disconnected couple hours should sort it

Ok cheers Andy will try that, but did get the constant flashing after about quarter of a mile.

Cheers Andy

Jonny Gav wrote:

You haven't changed the hose that comes out of the bottom of the solenoid to the resinator box have you?

This pipe has a restrictor pill in it, if you remove it you will get this problem, it can also get blocked so give that pipe a clean out with some brake cleaner too.

Do you know where can i buy a restrictor pill jonny as mine doesnt have one, It may be worth a try as mine is still not boosting properly.

Well after 2 weeks the em light has not returned, it was the thingy that sits on top of the boost solenoid bracket, the pipe from the map sensor goes to it. It was blocked.

Cheers Andy

warwicked try mine if you like mate or see finn

I had a spare which was clear when blowing through it, so fitted the spare and it is ok now cheers Drew.

Andy

drew160387 wrote:

warwicked try mine if you like mate or see finn

mite take you up on the offer m8

It only a two sec job nd al bring the z4 if u want. Just drops a text am in nights this week