Not a Quiz, But What are These Things?

[Martin Mc]

Hello folks,

Just wondered if anyone could put names / functions to the items (1-4) shown below? Knowing would certainly help make my reading of the Haynes book of confusion somewhat easier! I believe item 1 is a fuel pressure regulator (now that jay-kay-em has put me right!)



All responses gratefully devoured

[WhiteWolf]

1: Fuel pressure regulator.

2: Idle control valve..

3: Crankcase breather

4: Air temperature sensor.. Not a 100% on this.. It would make sense though

[Martin Mc]

Ok, here's another thing that is a mystery - any clues about what it is and its function?

[dcwalker]

It's the auxiliary water pump fitted to the turbo and B18EP & B18FP engines. Runs for a short time after you switch off to keep the coolant circulating and avoid hot spots.

BUT - it looks to me as if someone has by-passed it - the pipes to and from it appear to have been directly connected together and you can see the fittings on the pump with nothing attached.

Volvo deleted this on the 2.0 litre engine so I don't think it's something that you cannot safely live without...but others might know differently!

David

[Martin Mc]

Thanks David, the disconnected pipes / unused openings had me confused. I remember the auxiliary pump running on from my first ES, but since I've not actually had the current car out on the road yet, I haven't really had a chance to assess the 'normal' running of this car.

Watch this space for more mystery photos!

Martin

[dcwalker]

Yes, my 1992 ES used to drone away happily after a run, making people look and wonder...

Keep the pictures coming - I suspect you will have to work really hard to defeat the assembled experience on here!

By the way, on your previous photo, WhiteWolf wasn't 100% sure, but is totally correct about No 4 being the air intake temperature sensor.

David

[Martin Mc]

Here's another mystery part - the 4 pin connector next to the alternator (see below).

Any ideas?



Cheers!

[dcwalker]

That looks like the connection to the engine oil level/temperature sender, which is down to the bottom right of the oil filter.

Are you getting an "OK" or "Check" on the info centre when you start up? And do you get an oil temperature reading? If not, that's why...

If you are, then I'll have to think again!

BTW, you sure this isn't a quiz?

David

[Martin Mc]

Hello DC,

Thanks for your reply - my car is a 480S, so doesn't have an info centre per se, but the same dash as the 440 / 460 (rev counter, speedo, warning lights) which means I don't have an oil temp gauge or display.

I was kind of hoping it was some type of OBD connector, that I could plug a reader in and become instantly enlightened as to the root cause of the rough running my engine is experiencing... I know.. some hope!

I'll find some more things to post in my 'Not a Quiz'.. I'm sure

[jamescarruthers]

Martin, you can read many fault codes on the later cars by counting blinks of the diagnostic box in in engine bay. Nothing to plug in.

Instructions here for the important stuff (engine): http://www.am.torun.pl/~ja/volvo/diagno ... stem.shtml
and here: http://www.volvo-480-europe.org/volvo48 ... flashcodes for CEM III (position 5, missing from the Polish site.

I have never done it myself as I seem to be an early 480 masochist who enjoys the difficult life.

According to this post, http://www.volvo-480-europe.org/forum/v ... =12&t=3548 , you can ignore 4-5-2

[Martin Mc]

Hello James,

How brilliant is that!? I've had a quick go using the onboard diagnostics and following our Polish friend's excellent instructions.

The code that comes up on the Fuel System port (2) is 1-2-1, which according to the tables means 'Air pressure sensor: no signal correspondence'.

Now I have recently (this month) changed that part, with no discernable effect on the lumpy idle problem, which suggests it might be something buried in the electrics between the sensor and the ECU. I'll check the wiring over the weekend, and make sure the part is fitted correctly, then disconnect the battery and wait 20 mins before reconnecting everything, and see if the problem persists.

Worst case, the car is booked into the local friendly garage, who understand about old cars and their quirks (the owner races and shows MK1 VW Sciroccos for fun).

Cheers!

Martin

PS What fun to have a new toy / gadget to play with! And what joy to find it works!!

[jamescarruthers]

You can do a continuity test between the big engine ECU plug and the sensor very easily! If it is open circuit, then there is your problem!

Hopefully, someone will be along to tell you which pins you need to look at on the ECU end.