My car usually makes 1.5'ish bar of boost, but since the day before yesterday it only makes base boost.

The car is mapped for vpower+E85, but the other day i ran out of E85 (thought I had one fill left, but no), and since then it's not making more than base boost (I've filled it up with the correct amount of E85, of course).

The car drives fine off boost, and the boost comes in as it should, it's just that it doesn't go higher than 0.8(ish) bar. It holds this 0.8bar to the red line too. Feels like it's massively down on power, obviously.

I've had the bonnet up, and all boost control hoses are connected and the boost solenoid etc seems to be attached to the wiring harness. Also no CEL.

Still to connect my odb2-reader, but anything obvious I could try first?

 

Do you have low boost swiching on your model using the rear heated screen switch and the throttle pedal. If so it will only give base boost when switched.

 

Hmm, no, I don't think so :-) Either way, tried full throttle and pressing the rear screen demister button, and no change (tried a couple of times)

Annoying, the car runs so nice and sweet, just doesn't boost

It's got a perrin 3 port boost solenoid - anyone know if it's possible to test these on a new-age car somehow?

 

Problem solved by disconnecting the battery for a couple of hours - phew!