Misfire.

Evening, I'm getting serious amounts of popping and banging when booting it in all gears. The engine coughs and splutters, mifires and eventually jumps into limp mode. The car has just had a new engine fitted, with a VXR turbo replacing the std. It could be water ingress I know (will have to get her home before I can check) but I've read something about the VXR turbo unit needing some special care and attention, maybe the boost settings altered? Courtney and Thorney both say the LEH 'bo will act as a direct replacement without any futher configuration but what I've read on 't web suggests otherwise? Any thoughts? As always all input is appreciated. Cheers, Chris

somewhere you must be getting unmetered air to make the mix wrong , is the ignition timing correct , ie. exhaust cam sensor?

Evening,

I'm getting serious amounts of popping and banging when booting it in all gears. The engine coughs and splutters, mifires and eventually jumps into limp mode.

The car has just had a new engine fitted, with a VXR turbo replacing the std.

It could be water ingress I know (will have to get her home before I can check) but I've read something about the VXR turbo unit needing some special care and attention, maybe the boost settings altered? Courtney and Thorney both say the LEH 'bo will act as a direct replacement without any futher configuration but what I've read on 't web suggests otherwise?

Any thoughts?

As always all input is appreciated.

Cheers,

Chris

You NEED to adjust the actuator,the VXR unit is set up for higher levels of boost which WILL put you in limp mode. I had the same problem when I fitted mine, adjust the actuator in 5 mins & all should be fine.

Evening,

I'm getting serious amounts of popping and banging when booting it in all gears. The engine coughs and splutters, mifires and eventually jumps into limp mode.

The car has just had a new engine fitted, with a VXR turbo replacing the std.

It could be water ingress I know (will have to get her home before I can check) but I've read something about the VXR turbo unit needing some special care and attention, maybe the boost settings altered? Courtney and Thorney both say the LEH 'bo will act as a direct replacement without any futher configuration but what I've read on 't web suggests otherwise?

Any thoughts?

As always all input is appreciated.

Cheers,

Chris

You NEED to adjust the actuator,the VXR unit is set up for higher levels of boost which WILL put you in limp mode. I had the same problem when I fitted mine, adjust the actuator in 5 mins & all should be fine.

This sounds promising...

How do you go about adjusting the actuator? and to what setting? Is it a 'get it right or kill the engine' job? I assume so?

somewhere you must be getting unmetered air to make the mix wrong , is the ignition timing correct , ie. exhaust cam sensor?

Ill check this out.

Although, having absolutely no knowledge of anything to do with engines Ill have to do some digging!

Hi just fitted a VXR turbo to mine. I did not get any probs with misfiring in fact it seemed to be running very well until it kicked in to limp mode when booted. With a some help from the kind members on here I adjusted the actuator as instructed and it does not overboost now. The thread on this is a little lower down in this forum. Rds Mick

somewhere you must be getting unmetered air to make the mix wrong , is the ignition timing correct , ie. exhaust cam sensor?

Ill check this out.

Although, having absolutely no knowledge of anything to do with engines Ill have to do some digging!

Wind the actuator rod nuts down a little but as Micknw said I did'nt have any misfire just got kicked into limp mode when it boosted!

I have had the symptoms twice. The 1st was a loose crank case sensor. The second was a faulty coil pack. I suspect the others have already hit the nail on the head but if you get no joy there, then my offering might be worth checking.

Dannynewport, Micknw, How do I know how much to adjust the actuator by? I've read Micknw's thread but it doesnt mention this. The reason I have a new turbo is because the last engine munched itself. I'm worried if I adjust something wrong it'll result in another dead engine!

Dannynewport, Micknw,

How do I know how much to adjust the actuator by? I've read Micknw's thread but it doesnt mention this.

The reason I have a new turbo is because the last engine munched itself. I'm worried if I adjust something wrong it'll result in another dead engine!

Sorry to thread hijack but I'm having overboost issues too and would like advice on how best to adjust the actuator.



Assuming the far bolt is the lock nut (?) what direction would you turn the near nut to reduce boost?

Cheers,

Dave

To reduce the boost you want to loosen the nuts, ie towards the end of the actuator shaft.

I just backed the two nuts off a few threads at a time and road tested until the car stopped overboosting. Not really much of a problem on a new actuator apart from the extreme heat from the manifold. It might be more tricky on a rusty actuator rod. Maybe it's an idea to run the outer nut up and down the thread a bit while cold before adjusting when hot.

Thanks for advice