Legacy gtb boost hesitation

[neodowd]

Hi Guys

I have a problem with my 1999 GTB legacy. The car boosts well at low rpm but when I put my foot down and the secondary turbo kicks in it hesitates big time and Doesn't seem to boost. The check engine light has not come on and I have checked the vacuum hoses and nothing seems wrong. Does any one have any advice? could it be a boost leak, and what symptoms will the car show if the secondary turbo is stuffed. Any advice would be awesome

Thanks

[DRFVDR]

Welcome to Twin Turbo Subaru Ownership, I think what you have found is the Valley of Death between the 2 turbos

[neodowd]

thanks, I dont think its the lag between turbos, the second turbo is not boosting and hesitating in a major way that I have to slow down. It feels like its hitting the boost cut in quick succession.

[neodowd]

Sorry I should of put car lurches repeatedly instead of hesitates

[ben-jamminn]

Try changing sparkplugs? I used to have something similar happen with my wrx, new plugs fixed it

[neodowd]

Plugs have been changed by previous owner, Have only owned for two weeks problem started today.

Looking over other posts I'm thinking it could be a solenoid or sticky actuator problem. Problem only starts when secondary turbo comes into play.

[Guest]

these arent a 5min fix usually, there are many different components to the Twin system

hesistation sounds more like an ignition issue

Time for someone who knows what they are doing to look at it for you

(As per all cars bad diagnosis costs plenty and even more on Twins as there is so much to them)

[DRFVDR]

 Ichi Ban said:

these arent a 5min fix usually, there are many different components to the Twin system

hesistation sounds more like an ignition issue

Time for someone who knows what they are doing to look at it for you

(As per all cars bad diagnosis costs plenty and even more on Twins as there is so much to them)

+1

You really have to take to a subaru specialist,not sure who is the best in ch ch, but i am sure some one on here will know.

[maserati mick]

A mate of mine had exact problem with his 99 b4 even went for a cruise in it and had same symptoms felt like boost cut took to subarts and surely enough had to replace secondary and the tight arse replaced it with a primary turbo so hez runing two primary model vfs

[neodowd]

Thank for everyone's input, going to take it to my mechanic sometime this week. Just out of curiosity does any one Know what turbos

are in a 1999 Gtb Legacy? Im sure there are a few different variations, but what are the most common ones thanks.

[ADIKT]

 maserati mick said:

A mate of mine had exact problem with his 99 b4 even went for a cruise in it and had same symptoms felt like boost cut took to subarts and surely enough had to replace secondary and the tight arse replaced it with a primary turbo so hez runing two primary model vfs

lol

[neodowd]

*update* took to the mechanic today, he thinks it might be a faulty coil and the hesitation and surging is the car running between3 and 4 cylinders.

He is going to put some new coils in tomorrow ( fingers crossed it works)

[evoeater99]

Hope all goes well with it tomorrow mate! same think happened in my 00' GTB was and intake issue from having a pod filter on, which was sucking hot air and shaking round as it wasn't properly fixed in place. ended up putting in factory air box, new air flow meter and everything was sweeeeeet

[neodowd]

Yay all fixed, it was the plugs after all that. The previous owner had advertised the plugs had been changed but obviously not.

Now I gotta get the problem fixed with my forester its throwing a p0171 code system lean on bank one...subaru's you gotta love them

[ben-jamminn]

Yussss was right with the plugs after all

[Joker]

 maserati mick said:

A mate of mine had exact problem with his 99 b4 even went for a cruise in it and had same symptoms felt like boost cut took to subarts and surely enough had to replace secondary and the tight arse replaced it with a primary turbo so hez runing two primary model vfs

 

you can't physically fit a primary on the secondary side...