Hi all.

I have a 03 XR6T and im having this no boost problem....well kind off. With a boost gauge connected it struggles to make 4psi. With a 10 psi capa flash tune it still only makes 4 psi. This is the strange thing. We were trying to rull out weather there was an isuse with the boost control solanoid so we disconnected the actuator vac line to see if it would free boost over 4 psi. With the hose disconnected it only made 2 psi....strange u think it would make more?? We have checked for boost leaks and its all good. Im thinking the actuator might be stuffed but I was just reading about blocked cats causing the same problem. I dono where to go from here so any help would be appreciated.

thanks

regards ben

Have a chat to the tuner / supplier of the Capa Flash box ... They should be able to help.

Welcome to the forum Ben

I'm having similar issues with mine at the moment, best thing to do is to take it to a tuner and have them diagnose what's going on. we could rattle off a few things that it could be, but a tuner will be able to tell you definately what it is.

where are you located Ben?

Dan

check the boost gauge set up

I thought this things still put a flat 41/2 psi in when the actuator was disconected

how many km's on the car could be the usuall suspects coils or plugs

Welcome to the forum Ben

I'm having similar issues with mine at the moment, best thing to do is to take it to a tuner and have them diagnose what's going on. we could rattle off a few things that it could be, but a tuner will be able to tell you definately what it is.

where are you located Ben?

Dan

Im located in albury/wodonga so theres no tuners around here that would have any idea about these. Im suspecting an actuator issue as the guy I brought it off took it to dealer ship and had all the manifold/tubo gaskets replaced and ever since then it has been like this. I went for a drive in this car long before I brought it and u could here the turbo start to spool and suck when it was on full boost. Now it wont even do that, it just sounds restricted. The fact that it runs less boost with the acuator hose disconnected makes me lean towards an actuator or cat probem. With the hose disconected theres nothing from stopping the turbo making whatever boost it wants. Today Im going to see if I can un bolt the cat and see if it makes a difference.

check the boost gauge set up

I thought this things still put a flat 41/2 psi in when the actuator was disconected

how many km's on the car could be the usuall suspects coils or plugs

Checked all the connections and tried two different boost gauges ( electronic and analog).

Dont think it would be coil or plugs as I think they were replaced under warrenty by the previous owner but ill have to check.

I had the same problem mate and couldnt work it out...

in the end it was my capa box...got a new one and the car makes boost and holds it

Had the same issue with my CAPA flash tuner that was supplied from KPM with Generic tunes. Initially I flashed in the 8psi tune and it still only made about 5psi. Then I tried the 10psi tune and the ute wouldnt even start. I went back to the 8psi tune, still no start. Went back to stock and it was all ok.

Once I contacted KPM they advised to send it back to them with the info of the ECU (stack of numbers on the ECU)

They worked there magic and it all worked. However, ive still kept my ute running on the stock tune. I didnt bother about using generic tunes.

Mine is a 03 BA.

I took the exhaust off at the dump pipe today and took it for a drive. With the 10 psi tune it boosts all the way to 15 psi, im guessing this is because there is no restrcition?? looks like a blocked cat is the problem but it comes on boost at about 4500 rpm and is really laggy where before when it was running right it came on at about 3500 rpm. Do u think this could be an actuator/waste gate problem or something to with the ignition side of things?? it breaks down sometimes when coming on boost so that could have something to do with it?? Im going to take the dump pipe off tomorow and clean up around the watse gate flap and and arm as it might be gummed up. any more ideas

Edited 23/05/08 10:57 AM23/05/08 10:57 AM by ENV-355

I took the exhaust off at the dump pipe today and took it for a drive. With the 10 psi tune it boosts all the way to 15 psi, im guessing this is because there is no restrcition?? looks like a blocked cat is the problem but it comes on boost at about 4500 rpm and is really laggy where before when it was running right it came on at about 3500 rpm. Do u think this could be an actuator/waste gate problem or something to with the ignition side of things?? it breaks down sometimes when coming on boost so that could have something to do with it?? Im going to take the dump pipe off tomorow and clean up around the watse gate flap and and arm as it might be gummed up. any more ideas

I would bet its the tune allowing the boost to come on.

I have seen a wastegate flap, drop out of its sleve, and was open all the time, this sounds like the same thing to me, the reason you saw 15 psi, with no exhaust is even when the flap is open, these cars can over boost with no restriction, so I think you will find,

a bent actuator rod

or the flap is not covering the hole properly.

or could have came off the actuator completely.

David