Freelander 1 Throttle delay - low power from stop

Thanks hd3... luckily my brakes always worked well and were never solid or hard... only with the engine off, of course.

So it is a "vacuum check" valve? I thought it was some "one-way" valve or so. Why my EGR solenoid was connected there?

Besides, there is no other place to connect the EGR. Besides mine is blocked from long time already... when I blanked the EGR. The brake/retake issue is much older than that.

It's connected to the vacuum pump, it's use is to supply vacuum to the brake servo, egr valve turbo boost sensor

Well... thats is clear to me.

My question was more specific on what exactly does it do? Because if it was "only" to supply vacuum, why not use a simple T junction? Why does it has an arrow showing the direction of the air/vacuum flow?

Because it's a valve, it only flows one way - It don't supply vacuum the vacuum pump does that

Tiny1000 said:

It's connected to the vacuum pump, it's use is to supply vacuum to the brake servo, egr valve turbo boost sensor

Click to expand...

You wrote it supply vacuum.

Unplug the MAF to see if there's an improvement.
If you have sticking calipers, this could also be part of the problem.

My question was more specific on what exactly does it do?

Click to expand...

i imagine it's to keep the vacuum state as intact as possible
given there are solenoids valves in the system ..
and diaphram actuators ( egr and turbo ) ..
then there's probably times that 'vacuum' state in the line ..
becomes 'above-a-vacuum' somewhat .. on and off ..
plus the vacuum pump itself must give out 'pulses' into the system ..

don't know 100% for sure .. just a theory on why it's there

as for that connector thingy ..
i only posted the link as it seemed the poster knows what it is ..
i thought it were just some type of connector :-/

( btw: not read thru this thread to see what the issue is ..
( just jumped in .. as i'd been reading that other thread
( n' saw your last post about 'what's that part' ..

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read thread ..

Unplug the MAF to see if there's an improvement.

Click to expand...

^^^ .. +1

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So guys, today I woke up eager to unplug the MAF and see how it goes (as its a weekend "dry" and not busy)... I took half of the engine covering off... and I was freezing (as I need to work in the driveway. Well... long story short... i unplug and noticed that the high pressure fuel sensor connector was sort of "greeny" inside... signs of corrosion (possibly electro-chemical corrosion as the connector is sealed). I gave a nice a long blast of contact cleaner.. dried well... reconnect... after a quick drive around the block it looks much better... moreover, that annoying giggling/misfire/misbehaviour at 2000RPM seems to have diminish or even disappeared. I will drive to the Roaches tomorrow and see how it goes, I hope the problem is solved.

Thanks guys...

Green death in the connectors. Well spotted and hopefully you've got it sorted. Might be an idea to put some dielectric grease in the connector to keep the corrosion at bay.

http://contralube.com/contralube-770/

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The valve is one way so that it holds vacuum. For cases where your engine cuts out say in the second lane of the motorway, you will retain servo assistance for one maybe two pushes of the pedal.