Hey guys,

just taking the car for a drive when the engine starts over revving. When I mean over revving I mean to redline and beyond so that I could hear valve bounce.

I checked the throttle cable: all ok, not staying open.

The only other thing I thought it could be was a broken fuel regulator.

It wouldn't stop revving until I turned the ignition off. It did puzzle me that it didn't run out of air even though the throttle was closed.

any ideas?

Aftermarket ecu? Ecu stock should have rev limiter shouldnt it- stoping this

The engine won't rev unless the throttle is opened. It won't overrev unless the throttle is opened a lot + load is light. Sometimes this occurs when the clutch is slipping.

Well the throttle was closed, my foot was off the accelerator. Still went to red line - should have been idling.
Every time I turn the engine on, straight to redline.

Stock or after market ecu??? Manual I take it too

You must have a massive air leak. It doesn't matter about the ECU -- the ECU can't supply air to the engine.

Maybe the IAC is stuck open or something.

Heard of electrical issues with aftermarket installs where they remove rev limiter and as older ecu had no cold start some have issues due to faulty sensors

It is an aftermarket ecu, so I'll replace that. My feeling was that it would be an air rather than fuel leak, so perhaps the intake manifold gasket has blown a hole or as you say the IAC is stuck.
Thanks

ECU cannot cause the engine to rev over redline -- so why are you replacing it? The ECU can only limit the redline -- it can't exceed it.

If your throttles are actually closed, air is getting to the engine elsewhere.

Is it a DET or just a DE?