not code 66 yet. primary boost under-load issues

[mitchpnz]

gidday,

been a while since ive been here. been a while since ive had issues with my wagon (only about 4-6000km between warrants)

1994 gt twin turbo manual legacy wagon bg5 chassis (without the coil pack on top of the engine)

lately, for a few weeks or so, i have driven myself nuts hunting a problem that throws no codes.

low range revs, so im assuming primary turbo/primary turbo control issue (im guessing low rev range in the primary)

under load, hard acceleration, in any gear, in that lower rev range, the acceleration is incredibly jerky.

i have (for reasons unknown) changed the knock, tps, engine temp sensors

i have also cleaned out the solenoid box, including the lines, and stayed away from the MAP sensor.

i have even tried a 2nd box as well, to eliminate the possibility of a dodgy bit in the box.

partial throttle, leads to partial boost, with no issues.

2ndary turbo boost seems fine (which is odd, coz i believe the primary boosts at the same time as well, once its exhaust gas has got the 2ndary up to pace)

anyone else had or know of a similar issue?

long winded description i know just trying to get as much info out here as i can to avoid any obvious questions, keeping in mind ive had no codes

[les666]

Have you cleaned out the boost control solenoid in the passenger guard? Could the cat converter in the primary dp have crapped out?

Edited July 2, 2015 by les666

[mitchpnz]

Can't say I've checked then.

A solenoid in the passenger guard? Whereabouts is it exactly, access-wise?

I get the feeling checking the cat won't be a 5 minute job haha. Will be number 2 on the list

[les666]

Access wise either take off the front bumper or take wheel off and pull back arch liner.

[mitchpnz]

Will give it a nudge, cheers.

Definitely a Saturday job, lack of sunlight after work is getting annoying lately haha