2 things.

 

A. What sort of running probs would a faulty 02 sensor give you - would it cause car to run slower?

 

B. I have an aftermarket guage and a HKS EVC Boost controller.

On Idle the guage reads -21 INhg but the boost controller reads -478 mmHg

 

Just wondering whether boost controller may need recalibrating or would a calibration not change the vacuum strength?

 

Basically, Im just looking for other ideas for a problem whereas when revved and let go revs drop to 200 and sometimes stalls - it normally does this when coming down from high speed to a stop and the car just stalls.

Could a battery problem cause this as I notice a fair drop in revs when switching off heater etc at tickover.

 

If Not - I'll be off to see someone on this group who can wave a magic wand and make all my problems go away.

-478mmHG is pretty low...normally it should be around -520mmHG for an engine in good shape and no vacuum leaks.

So my fist suggestion: check for vacuum leaks (listen for hissing sounds during idle...normally at the back of the engine or near the throttle bodies)

My bet is the dump valves being slightly open. Are these the same ones VinZ has? Revs dropping sounds like classic leaky DVs...

Hmm, John Dixon told me this too, Its not I was ignoring him its just I spent an entire day cutting my fingers apart trying to fit them and the thought of doing it all over again pains me.

 

They are the Turbo XS Dump valves in place of std recircs. I can make them into recircs I think as the trumpet pipe look same diameter as a recirc pipe. I should be able to do this ok. Would this cure the "Leaky dv"?

 

 

Would doing that increase vacuum.?

Is has seemed to be getting progressively worse.

 

I just checked vaccum again and HKS is actually reporting -430.

 

see. the other thing is my boosy guage is now reporting 10psi and seems slower than when I had my 1mm boost jets in (running at 14.5psi) but my HKS is reporting 1BAR (which I believe 14.5psi)!!! ???

 

 

Thanks

O2 sensor would probably make you run a little rich, you will also get a sligh lumpy feel between 2k-3krpm when the car is warm. You won't really feel much of a difference performance wise though.

 

I would agree with Duffer, antf has just fitted dump valves and the spings were not firm enough therefore he was stalling everytime he came to a stop.

O2 sensor would probably make you run a little rich, you will also get a sligh lumpy feel between 2k-3krpm when the car is warm. You won't really feel much of a difference performance wise though.

 

I would agree with Duffer, antf has just fitted dump valves and the spings were not firm enough therefore he was stalling everytime he came to a stop.

 

so is it worth putting on my original recircs - or converting Turbo XS's into recircs -

or can i tighten the spring?

 

Thanks

The Turbo XS ones come with packing washers and it tells you in the instructions how to install them to give a stronger spring...

Mine were 2nd hand - no packing washers.

I think I may bang my original recircs back on to prove fault.

They are just standard large washers you can get from any DIY shop.

I'll type out the instructions tonight if I get chance.