Well, apart from working this morning, I spent the day fitting the FSE and trying to sort out a vacuum problem on the new engine.
Dave, you remember that my #1 VRIS actuator was very sluggish compared to the others when I start the engine? I reckon this is down to an air leak somewhere. So I replaced every vacuum tube with that nice new blue stuff I picked up at Japfest, double-checking the connections against the vacuum diagram as I went.
A few of the old tubes were definitely a bit crusty and things improved slightly. But I'm sure I can hear a hiss from under the intake manifold on tickover. I can only surmise that the tubes around the vacuum chambers or the chambers themselves are leaking.
So, my next step is to remove the intake and check. I think I'll leave it until I can afford a phenolic spacer set though and do the job all together next month.
Can you foresee any problems running with a small vacuum leak? (Apart from the obvious drop in performance that is.)
If there is a vacuum leak air will be being sucked into the inlet manifold without being filtered first and without the flow rate being monitored by the flow sensor.
The greater the level of manifold vacuum the worse the problem will be. Best vacuum is usually when the engine is idling (throttle nearly closed) so you may see a slightly erratic idle.
I was asked to look at a very old Citroen AX GT about 18 months ago which misfired, overheated and didn't return good fuel economy. On this car the regular air filter had been replaced by a performance one which did not have nipples for one particular hose which went into the inlet manifold. The clown who'd actually fitted the part had simply taped up the end of the hose which had proceeded to leak. When I used a self tapping screw to seal the end instead the engine worked a little better, but still lacked acceleration because the vacuum advance hose was also disconnected. I said his best way forward would be to source an original air filter assembly.
The sensors in the exhaust will correct for the fuel / air ratio imbalance to some extent but you may still get odd effects under (say) hard acceleration. However the ECU may not register a fault. You might also get pinking / overheating but the knock sensor should detect this and retard the ignition to suit.
Four Triple Two - 198901 miles on original powertrain.
Last seen standing in line for the crusher.
Forgiven - maybe
Forgotten - not likely
Ken if it helps I have a pair of vacuum gauge's , you might need to get a "T" section adapter to use these in line to get the readings , wonder if john's books give some readings as a base to work from, but just checking the lines should show whats happening.
pm me if you need to borrow them
Why mod when you drive Perfection
UK Engine Swap Team Member if you can find us - you can hire us
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