tmo

MY99 when accelerating at full throttle between say 80 and 100 (private road) engine seems to sort of surge power then hold back then surge again etc etc.

Any Idea's

David MY99

clean out the boost sollenoid

ozzy

Would a bad MAF cause that sort of problem? I noticed mine doing this quite badly on the 3hr drive back home. Majority was all motorway or dual carriageway, but sounds the same.

WOL in 4th or 5th and the car "pulses" as it's accelerating.

Stefan

tmo

Is the boost sol. the thing with denso written on it part no. 16102AA160 with two chuncky pipes (one goes to inlet manifold, 1 goes to air intake - engine side of maf) and a blue elect connector ??

tmo

http://stefanostadal.homedns.org/ima.../ground_01.jpg

Is it the blue thing under "VE" in DRIVER

Sorry Stef !!!!!

tmo

Or does anyone have a picture

APIDavid

iTrader: (4)

Found the picture, Just to confirm. YEP that's the little bugger.

Good Luck David APi Engines / APi Impreza

tmo

Thank you David

ozzy

LOL; no worries m8.

At least now I know what to try too

tmo

tmo

All sorted.
Didn't take long, apart from the amazing dissapearing nut (under the air filter assembly, soon recoverd though!!) gave all the pipes a good clean out the "joining the two green wires" works a treat.

ozzy

what's that then? do you mean green connectors as part of the ECU reset or is this something else?

What'd you use to clean the pipes?

Stefan

tmo

Yep, everything starts clicking and whiring, make sure you have removed the pipes first and have the sol. unbolted and ready. Connect the two green wires and off it goes !!!! Ensure you have a rag to soak all the **** up that comes out of the ports one you start spraying. Best to wrap the rag round your hand and sit the sol. in it. Gives a bit more control on the angle of spraying. (You will see )

What'd you use to clean the pipes?
Same thing, tin of spray brake cleaner works a treat

ozzy

Right, so let me get this straight in my little head.

You unplugged all the tubes and unbolted the sol first.
You left the lecky connector connected and started the car
Then you connected the two green connectors under the dash (inc. the black for the reset procedure ???)
Then sprayed some brake cleaner in about it and had it wrapped in an old rag so it didn't blow the cr@p all over you and the engine bay

That about it?

Stefan

tmo

Yep sounds about right, didn't connect the black wires though and didn't start the car.
As you said,
Pipes off
Sol. unbolted (bottom nut likes to go for a walk under the air filter assy.)
Connect green wires under dash
Get can of brake cleaner ready
Hold sol. in large rag
Turn on ign. DO NOT START THE ENGINE
All valves, sol. etc and fan start to cycle, so lots of clicking / whooshing going on.
At this point Sol. should be pulsing away, so holding it in the rag give it hell with the brake cleaner up both ports. Really give it a good internal soaking until you
A- get tired
B - Get completely covered in dirty fluid
C - fluid running clear out of sol. (and up arm / side of car) is clear.
Once satisfied give it a blast for luck then turn off ignition and let valve drain / dry out whilst turning your attention to the pipes.
Remove pipes one at a time (remember which one goes where!! think the bent ended one goes to the back ) and again give them hell with the brake cleaner, Let them dry out for a couple of minutes and then re-fit.
I also cleaned out the small Dia. hoses that run from the T piece to the actuator. If you have a look you will see bloody little clips that shred your fingers!!

Refit sol. (retrieve bottom nut from under air filter assy)
Complain about the ridiculous size of hand required to fit bottom nut (retrieve bottom nut from under air filter assy again) (remove air filter assy as an option - its a lot easier to get at the little bugg@r)
Re-fit pipes after routing back through adjustable cable ties

Start her up, and go for a bit of a run

And that’s about it!!!

Hope this helps

Tim

ozzy

cool, it was the starting car bit that threw me.

I'll ask my 12yr old sister to re-attach the solenoid nut

Thanks again,
Stefan

ozzy

oh, and another question.

When you had the surging, did you notice the boost actually change (assuming you have a boost gauge)??

Stefan

tmo

Yes it dropped,

Tim

TomRa

Want to do this in my 93' WRX Ra.
Is the solenoid the one that is vertical denso part 16102 etc? Mine has 3 pipes off it thats all.
Then drop oil level afterwards to proper level, is that correct?
Then ecu reset?
Thanks
Tom

ozzy

It was the MAF on mine afterall

trails

iTrader: (41)

OK so where the hell are the 'green wires'...took the solenoid off tonight and then couldn't find the wires although even half cleaned it seems to have improved it.

i have a MY00 with a SECS unit so i can reset the ecu from there...bloody annoying that i've got to do it all over again tho

trails

iTrader: (41)

bttt

Gear Head

iTrader: (2)

Where are the greens wires? Drivers side?

tmo

On the drivers side tucked up behind the trim around where your left knee would be if you where sat in a normal driving position. You will find two black and two gren wires, might be taped together in colour pairs i.e. green and green etc. They arn't the biggest things in the world !!

Tim.

trails

iTrader: (41)

they have black connectors on them, my car is back to running perfect after cleaning the thing too, so thanks all!

tmo

trails

iTrader: (41)

all seemed fine until this evening; open throttle in forth i heard a bit of a bang and then had a massive surge forward. thought i'd best check the maf (assuming it is the sensor on top of the airbox pipe), i unplugged it, car coughed a little but carried on running...I guess i’m about to be around £70 out of pocket for a new one?

tmo

Better to change it (£70 or LOADS for a re-build)

Mind you 2.5ltr

trails

iTrader: (41)

nice idea but its my daily drive so fuel and insurance would decimate me

trails

iTrader: (41)

done!!!

ta for Paul at XS for the MAF, car pulling like a good 'un again especially in top where we are back to silly speeds with no effort or surging...thanks all for advice

just a word of warning, DO NOT use a plain posi bit and try and knock the security tabs out of the middle. I did and ended up hammering an allen key into the bolt 'cause i destroyed the posi drive splines...avoid the nervous sweat and go buy a proper one