agu boost problem

[jake-w07]

Hi my mate has bought a golf gti engine code agu and the car has never boosted since he bought it. Hes changed turbo for a recon turbo checked actuator and has changed a couple sensors and pipes but car still doesnt boost over 5 psi

Anybody got any ideas

Cheers jake

[jake-w07]

Hes also put a new maf on it

[beppe2672]

Get it scanned for fault codes! Will help point you in the right direction hopefully.

[joshstanvw]

Could be the n75 valve goosed and also check for boost leaks I had an inter cooler pipe come off lol not good

[Jin_C]

Have you checked for a blocked cat? Or disintegrated cat that has blocked the rest of the exhaust system? Excessive back pressure will cause the ECU to fall into temporary limp mode and not boost over a set amount

[jake-w07]

Car has decat and straight through so dont think that will be the problem ? Could exhaust be blocked some how? Hes checked for boost leaks n also plugged into computer, I think car may have had n75 deleted but will check with him

Cheers jake

[leigh_harty]

Car has decat and straight through so dont think that will be the problem ? Could exhaust be blocked some how? Hes checked for boost leaks n also plugged into computer, I think car may have had n75 deleted but will check with him

Cheers jake

N75 is the boost control and should be left as is. If its faulty it will run about 5psi actuator pressure if I remember correctly

[jake-w07]

Okay mate ive read up that theres no way of testing it other than swapping it, will it be the same n75 on my auq? Could try swapping it over n clearing faults see if that makes a difference

[Chris.]

The valve off your AUQ will work.  Remember to plumb it up right.

[jake-w07]

okay will try giv it a go over christmas