Hesitation / Missfire under mid to hard acceleration only

[SkoomaD]

Once I've rebuilt and tested i'll report back if it's cleared up my issue, you would think it can't be helping anyway!

[tomrdy]

My DISA was like that too. Free spinning pretty much so non operational.

That caused idle lumpiness for me occasionally - so perhaps you're getting the lumpiness on throttle.

Fingers crossed the rebuild kit solves this!

You'll be able to test the operation after rebuild by plugging it in (leave out if motor) and turning to ignition (don't start the motor).

The probe should create a vacuum and you'll see the flap close (or open I can't remember which). Either way it will move and when you turn off, it should revert and there may be an audible "thaaack" sound from the rubber vaccuum/plunger bit retreating.

[SkoomaD]

Ok so i've rebuilt the DISA with the kit suggested and the car is much much happier. Took it for a short blast tonight and It pulls a lot stronger than it did and my issue seems to have almost entirely gone

I say almost entirely as It did seems to stutter a little at one stage on part throttle for a few seconds but other than that it was much much better so thank you for all the advice.

I'm wondering if perhaps the slight hint of the issue I had before is simply it either it learning as it's had the DME reflashed on a bad DISA valve and now its fixed its wondering what the hell is going on. Or perhaps things are a little sooted up still from it running poorly. Do you think there is any value in running some sort of fuel additive through it or is it more likely to do more harm than good?

I'm fairly certain it can't be coil related so I think I'll return the new coils I bought and just keep the two original ones I bought as spares.

Again thanks for all the input.

[AveZ4coop]

Glad you got it sorted.

[wonkydonkey]

Hurrah! I reckon just give it some miles and some beans

[ph001]