What Is It (box On Bulkhead)?

[geomowat]

Hallo all, just returned from being away for the last month and trying to get the 4.1 to idle properly again. When looking under the bonnnet I wondered what is the gizzmo that is fitted to a bracket that is screwed to the bulkhead/firewall above and behind (looking from the front) the engine. It does not seem to appear in the Chilton manual.

The object I am querying (is it the manifold absolute pressure sensor — MAP?) comprises two parts running horizontallly. The one closet to the bulkhead (looking from the front left to right) has two markings: a dot on the left and the figure 1 on the right where it also has an electrical connection and a small black cylinder sticking out to the right.

The front half of the object has (from the left) a vacuum hose, electrical connection, then the figures 3 and 2. This part looks to have a broken-off nozzel at the far right that could take a push on cylinder like the one behind it, but that is missing.

My three questions therefore:

What is this?

Can it affect the high tickover when the engine is warm?

Should it have some cylinder on its end?

In my absence, I note that no one has followed up Bothwell_buyer in telling me where I can find the details of which vacuum hose goes where ('vacuum hoses' posting).

Thanks in advance,

George

[anchorman]

I'm afraid I'm not very familiar with 4.1s.

Can you post a photo? Also describe where the vac pipes go to.

[bothwell_buyer]

Miserable swines. Ye cannae expect any mair frae a bunch o 5 door addicts but.

I'll hae a look later and see, an have a word wi ma friends at The Garage.

[geomowat]

Can you post a photo? Also describe where the vac pipes go to.

Thanks, I shall try to take one today; where on the site does it tell one levels of resolution to use when posting etc.?

I did try clamping lots of the vacuum pipes one by one as well as blocking the hole at the end of the anonymous whatever-it-is box, but the troublesome high idle (when hot) did not alter one bit.

Thanks,

George (escaped to the land that elected Boris de Pfeiffel and the sun is swealtering here)

[bothwell_buyer]

Aye ma man. The sun wis shining here so ah wis oot giein ma tan a wee boost wioot ma socks oan. never looked at ma cars an jist watered ma willows whit ah hav planted temporarily like.,

A wee run wi the auld man, her an auld John emptied the local garden centre o ice-cream an then back tae the hoose fur a sleep.

I'll tak a wee look at the manual ramoro -

[geomowat]

Bothy, jus ah wiell as a peedie bairn ah red 'Oor Wullie' or I wudnae ken whit yer on aboot!

Aye ma man. The sun wis shining here so ah wis oot giein ma tan a wee boost wioot ma socks oan.

Yer nae yun tae hae socks wir yer bauchles?

I'll tak a wee look at the manual ramoro -

Thae morn or thae morn's morn

George

[bothwell_buyer]

Bothy, jus ah wiell as a peedie bairn ah red 'Oor Wullie' or I wudnae ken whit yer on aboot!

Aye ma man. The sun wis shining here so ah wis oot giein ma tan a wee boost wioot ma socks oan.

Yer nae yun tae hae socks wir yer bauchles?

I'll tak a wee look at the manual ramoro -

Thae morn or thae morn's morn

George

Ah wis brocht up wi the Broons an Oor Wullie as ma maw gies the annual fur 50 years.

See aifter gettin yur varicose veins dun - they dinna tell ye that the blood vessels cut aff affect yer skin moisture - basssssttiddds. Leg swelling is noo the norm.

The morn owr thew morns morn....weel ahm still up haein a wee swally o the amber nectar so ah'll be up at 8am but ah need tae get the RAV nummer wan tae the garage, an ah need tae pick up ma trailer frae there tae get rid o ma auld XJS which is beyond ma lifetime tae repair it. So ah micht jist pick up the trailer furst an shift ther jag then shift the rav aifeter......depends if its sunny an ah can be bothered. ma motivation is low the noo haeing come aff the antidepressants, an no achieving ma regulation high intake o amber nectar ye ken. then ma youngest (28) daughter gets amrried oan the 16th.

Nae much bother as ah pamped them oot 7 years ago,.

A wee toss o thre caber as whether ah gae alang tae the wedding oar jist stay at home wi ma remaqins o the cask strengthy whisky - noo which wid ye dae???

[anchorman]

See her off (in case she changes her mind!!!) then finish the cask.

[Parts-King]

It's another world..........I'm still deciphering the lingo :D:

kingo

[geomowat]

My three questions therefore:

What is this?

Can it affect the high tickover when the engine is warm?

Should it have some cylinder on its end?

Well, having been nattering to a Toyota mechanic today and noticing that the reluctance to supply a answer by the usual TOC culprits was shared by the person in charge of the local (doon sooth) dealer, I at last can answer the three questions:

They are Vacuum Valves (true function unspecified) suspected part number either 17630 or 25860

Their malfunction "plays havoc with all sorts of tickover situations"

Yes, there should be a black cylinder on the end of both of them.

So, if the mechanic is to be believed and it is pointless trying to get to the bottom of the fast tickover before the damaged vacuum valve is replaced, I just dig into the pocket and do this next! Strange culture down here, people seem to think one is eager to spend money — must be all those personal-tax-allowance bribes?

(I tried to post a photograph as requested, but my ISP does not host such things and it was too large to upload to this site.)

Any further comments appreciated,

George

[Nettie McKenzie]

My three questions therefore:

What is this?

Can it affect the high tickover when the engine is warm?

Should it have some cylinder on its end?

Well, having been nattering to a Toyota mechanic today and noticing that the reluctance to supply a answer by the usual TOC culprits was shared by the person in charge of the local (doon sooth) dealer, I at last can answer the three questions:

They are Vacuum Valves (true function unspecified) suspected part number either 17630 or 25860

Their malfunction "plays havoc with all sorts of tickover situations"

Yes, there should be a black cylinder on the end of both of them.

So, if the mechanic is to be believed and it is pointless trying to get to the bottom of the fast tickover before the damaged vacuum valve is replaced, I just dig into the pocket and do this next! Strange culture down here, people seem to think one is eager to spend money — must be all those personal-tax-allowance bribes?

(I tried to post a photograph as requested, but my ISP does not host such things and it was too large to upload to this site.)

Any further comments appreciated,

George

Dear George

If you are still struggling, try speaking to Marc or dennis at The Garage - 01698 265303 and say that big Ian suggested you phone them for an opinion. Only 1 in the garage went down to witness Rangers getting cuffed so all will be well.

I have re-generated my relationship with Ian who lives locally. Unfortunately he has been diagnosed with ingrowing toenails and is away getting treatment.

[geomowat]

If you are still struggling, try speaking to Marc or dennis at The Garage - 01698 265303 and say that big Ian suggested you phone them for an opinion.

Thanks Nettie, but I do wonder if that whole part of Scotland is crawling with RAV4s?

Only 1 in the garage went down to witness Rangers getting cuffed so all will be well.

It would be cruel to mention the SPL . . !

Unfortunately he has been diagnosed with ingrowing toenails and is away getting treatment.

No known cure, but anyway, I should pause for breath before meeting Mrs.A. in a Glaswegian hospital!

George

[geomowat]

I at last can answer the three questions:

They are Vacuum Valves (true function unspecified) suspected part number either 17630 or 25860

Their malfunction "plays havoc with all sorts of tickover situations"

Yes, there should be a black cylinder on the end of both of them.

The answer is no I could not! Having spent a considerable amount of time at the local parts dept., the mistery object is neither of the above valves, but the Four Wheel Drive Solenoid (85440A), which is no longer available and as the last price was close to £300, that in some ways is a (financial) blessing! Anyone know where there is a 4.1 being broken as there is not likely to be much call for these solenoids (and why, apparently, they are no longer available)?

I am told that the missing cylindrical filtre is unlikely to have any affect on the fast tickover, which was my thought as blocking the vacuum pipes did not alter the tickover.

George

[anchorman]

You should find one at a breakers. Did you try blocking the broken outlet as well?

This is the valve that works the 4WD buzzer and servo. Unfortunately the info on the 4.1s is very limited hence the silence when you post your questions.

[geomowat]

You should find one at a breakers.

Have not managed to find a breaker with a 4.1 near West London yet, but will continue the search.

Did you try blocking the broken outlet as well?

Yes, no difference when the car was idling. the black cylinder that is broken off looks like the same sort as on other solenoids, is it only a filter?

This is the valve that works the 4WD buzzer and servo.

So, does this filter (?) have any effect? It would seem to be unconnected with my high idle problem.

Unfortunately the info on the 4.1s is very limited hence the silence when you post your questions.

Ah, actually, a couple of you have been extremely helpful, for which, many thanks. I just wish I had a greater understanding (or could get hold of a proper manual) myself. I am used to old cars where everything is obvious and I know how to diagnose things. The most modern system I have dealt with is the old Bosch D-Jetronic FI system, as this comprises discrete components, anything is possible (and the makers made all the technical stuff freely available).

I do have to say that I am really wondering if the old RAV4.1 is a suitable workhorse for the farm track as nearly everything I have tried to buy for it has been discontinued. A tale that makes them (and the pick-ups) not very popular with my Scottish neighbours — someone said that it was the first car they had had that was scrapped because of parts not being available (or being more expensive than the value of the vehicle) rather than it rusting away!

George

[anchorman]

It is a kind of EP (Electro Pneumatic) valve. If you press the 4WD button on the dashboard it opens the valve and that in turn opens a servo on the gearbox to inlet manifold vacuum. The servo then pulls (sucks) the 4WD selector into engagement on the gearbox. If you turn it off the vacuum is exhausted (opened to atmosphere) and the selector disengages. During this time a buzzer sounds to tell you that the selector is disengaging. This is because the selector can hang up on the gears if under load (the same as you will struggle to push the gear stick into neutral while the engine is pulling) and leave you driving on a hard road surface while in gear and could damage the box. The solution is to stop and wait or even rock the car gently back and forth to ease the load on the gears and allow it to drop out and the buzzer stops.

I've not seen the valve but there is almost certainly a filter to stop debris from being drawn into the valve and servo when it is energised. If there was an internal leak to atmosphere it could alter your idle speed.

I know you are frustrated with the vehicle but if you are only using it as a hack around the farm I would have said it was ideal as they are generally bomb proof (once you have ironed out the niggles). There are loads of them about and in scrap yards so I would persevere with it. Have you tried;

http://www.findapart.co.uk/home.asp

They are an online agent for many scrap yards. The problem you will have is getting them to understand what the part is so that is why I would urge you to take a photo. If you have trouble posting photos let me know and you can send it to me and I will post it for you.

This one on eBay is being broken but beware the price is for a wheel nut! You need to enquire for your valve;

http://cgi.ebay.co.uk/DARK-BLUE-TOYOTA-RAV...id=p3286.c0.m14

Regards