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 Top end hesitation.

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Alex-22

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Location : Hindhead, Surrey
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PostSubject: Top end hesitation.   12th April 2012, 23:37

I've just driven my mini back from Southampton on a very empty A3 and noticed that On acceleration, there appears to be a very definite hesitation or flat spot when I get to nearing 6k. It's like it doesn't want to rev any higher.
I can't say that I've noticed it before and it normally pulls all the way round to the limiter if pressed.
I'm running 97octane fuel too so I'm a bit unsure what to check first.
Any ideas?
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Alex-22

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PostSubject: Re: Top end hesitation.   7th June 2012, 13:37

.... it was the Pressure Release Valve Big Grin
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tazman
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PostSubject: Re: Top end hesitation.   7th June 2012, 17:13

Mmmmm that's interesting,,where did you get the pressure valve from and what cost,I think I have a same issue,when in traffic the car just cuts out,and when I read the code comes up with p1688 pressure valve
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Alex-22

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PostSubject: Re: Top end hesitation.   7th June 2012, 17:23

I got it from BMW.
I think it was around £40 but i'll check that.
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tazman
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PostSubject: Re: Top end hesitation.   7th June 2012, 18:01

Alex-22 wrote:
I got it from BMW.
I think it was around £40 but i'll check that.
cheers thumbs up
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Alex-22

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PostSubject: Re: Top end hesitation.   11th July 2012, 08:22

UPDATE ON THIS.

Further to having the PRV fixed my supercharger completely failed, taking with it the thermostat, and expansion bottle.

Apparently it had no oil in the gear chamber so the teeth wore down to basically nothing, this stopped drive to the water pump with inevitably led to the coolant overheating and exploding my expansion bottle.

Car has been to 1320, now has a new supercharger (28k miles), a delivery miles cylinder head, new thermostat, expansion bottle, and the guys also kindly replaced my piston rings so those are brand spanking Very Happy

I have to do 6-700 miles running in and then i've almost got a brand new engine Very Happy

Happy days Very Happy
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Top end hesitation.

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