1.8 issue

[ralphtown]

Quick update.

I,ve had a quick word with my mate and he has removed the down pipe and checked it for leaks.
No leaks.
He has replaced the exhaust/manifold gasket and is replacing the head/manifold gasket with a genuine VW part.

I,m getting a new coolant temp sensor in the hope that IT is failing.

So,basically,is there anything else I can check or replace.
Coz we,re out of ideas.

By the way,if anyone in Nottingham is reading this and has a code reader,please get in touch.
No sign of the diagnostic guy yet.

RALPH

[Leon27]

It is my car, thanks dude, I'm going to keep it standard, at least on the outside.

Did you check for air leaks using the brake cleaner method?

I'd get VAG-COM free yourself, a lead for about £20 etc and see what the temp sensor is doing before you replace it. You will also be able to see what the oxygen sensor is doing, if its values are switching or its dead.

[ralphtown]

UPDATE!!

I,ve replaced the temp sensor.
I,ve had repaired small leaks on the exhaust manifold (new gasket).
I,ve also replaced the down pipe gasket.

The hoses have all been checked and/or replaced.
The ignition timing was found to be a couple of degrees out and adjusted.
The cam timing was checked again,just to make sure something had,nt moved with the cam belt replacement.

Everything we,ve done has made no difference to the Lambda readings.
Still reading high(weak mixture).

SO!!
Can anyone supply me with the fuel pressure figures for a 1.8Golf with ADZ engine code?
This is the last chance saloon for this car.
If I can,t get it sorted by the end of September,I,m turning Japanese!!
And this one will go on ebay,spares or repairs.

My mechanic mate and I are reminded of when the diagnostics guy came,how he changed the Lambda reading by clamping the fuel return line
on the TB.
So,we,re looking at low fuel pressure as a final resort.

RALPH.

[javalin]

fuel pressure regulator faulty?  Have you checked the voltages, etc, available at the injectors?  One side should be +12v (aka battery volts) and if you have a scope the other should be pulled to 0v (gnd) by the ECU.  You'll need a scope or adapter for it that will take ~50v as there is a spike when the ECU releases the injector.

Simple one, but fuel filter?

J

[ralphtown]

Where is fuel pressure regulator situated on the car?
Does this have any adjustment to play around with?
Fuel filter has been replaced along with a ton of other spares.

I,ll get my friend to check out what you,ve just typed.
I can,t explain that over the phone

Would still like to know how much in psi or bar,fuel pressure should be tho.
Thanks for the tips,I,ll pass them on.

RALPH

[ralphtown]

My internet researches suggest fuel pressure for Golf Mk3 should be 3 bar max with 2.5 bar at idle.

There seems to be lots of expensive adjustable regulators online but I have found a replacement regulator with adjustability for less than £30.
Anyone ever used one of these or are OEM replacements cheaper than this?

RALPH

[javalin]

get a VW one, more money but you know its correct then.  VW ones not adjustable per-se, but they do have a vacume hose to the throttle body.  If there is a fuel reg on yours, it will be either on the end of a fuel rail, or part of the throttle body (if single-point-injection).

J

[ralphtown]

Euro car spares have given me a price of £39.99 plus vat,so around £45 new.

Can anyone better that price?

I,ll check my manual for the FPR location and get my man to check all hoses going to it.
Perhaps its pulling in some air around it,thus weakening the mixture.
I,m grabbing at straws with this motor

RALPH

[ralphtown]

Did a bit of digging around.
Fuel pressure regulator is built into top of TB.

Now,seeing as I,ve changed that with no difference,I,ve either got 2 fooked TBs or thats not the problem area.
Car drives and runs superbly,none of this makes any sense.
So,I,m going to bite the bullet and take it away from my friend,who is a mighty fine mechanic and take it to one of the specialists in Nottingham.
I think theres one in Lenton,called Auditec or something like that and I,ve been told they have all the latest diagnostic equipment in their workshop.

RALPH

[javalin]

sensible plan when all obvious stuff fails.

Let us know what happens.

James