BrettC

Hi everybody

Car: MY1998 UK 2000 Turbo wagon
Green panel filter
De-catted center section
Large bore rear silencer (which I am changing soon)
It also has a horrible VTA dump valve (also in process of changing)

If I accelerate with anything more than about 50% throttle the car loses all power (not electrical). It then recovers if I back off a little.

I have done a search on here. Most common fault seems to be a faulty MAF sensor however there also seems to be an associated idle problem which I don't have.

I have checked the MAF in that if you disconnect the cable from it whilst the engine is running the engine within about a second will stall. Could this still be the problem?

Any advice. Lambda sensor perhaps? What is it and where is it?

Only had the car two weeks - it ran really well when I got with the all the mods mentioned above. The only thing I have since changed is the green replacement panel filter as it had some sort of induction kit on it instead of the standard air box.

Appreciate any help chaps.

Thanks.

Yamarashi

I'd also check the coil pack(s), plugs and HT leads as they can cause a similar problem. These are all common issues and there's loads of info with a search.

BrettC

Thanks mate. I'll look into your suggestions.

Planning to clean out the boost solenoid tomorrow as well.

Is there any chance that because I changed the induction kit (no heat shielding or anything) for a green replacement panel filter that with the increased air intake and the de-cat exhaust I am now getting an overboost problem?

Should I consider a dawes device or equivalent in order to be able to set the boost just below fuel cut off? Or should I just put the cat back on?

Obviously want as much performance as poss but definately not with the sacrifice of reliability or potential engine damage.

Cheers

wikid11

g'day ive got a 99 wrx wagon, and had a problem that sounds just like yours.
the car ran perfectly fine, no problems at all till i floored it, then after 4000rpm at full throttle there was a major stutter, tried cleaning boost hoses and solinoid ,nothing, changed leeds,coilpack,wastegate actuator still nothing.
turned out the plugs were stuffed, changed them, now its perfect

STi wanna Subaru

iTrader: (1)

Money on MAF. can be failing and the idle still be fine in my experience.

finch81

I Have a MY99 classic, it has started doing exactly the same but only when its really cold outside, so im guessing possible overboost due to cold weather

SanMan

Hi there,
Similar problems... although I had gizzmo with mbc... so mine was the fuel that I was using not good enough for the boost...
However, if ure pretty standard, I guess plugs/leads... if plugs, get plats ngk6/7 the higher the colder and gap to 0.7mm
if leads normally have a crack on them, u need to carefully glue them together and then use a high voltage silicon gel - if u know people who are paramedics, they should have some and put a little gel in there.
Hope this helps u
S

BrettC

Thanks guys for all your help. Appreciate it.

I was lucky in this instance - I cleaned the boost solenoid and all is well.

Initially when turning on the ignition there was no click from the solenoid, after the clean, you can hear the click and the overboosting has stopped.

Thanks again

Brett