How to identify a pd engine

[Ibiza2000]

How do u identify what engine u have? I would like to know if I have a pd90 really,

I'm unsure if I have the old style diesel or the peumpe deusol or how ever the fcuk u say it lol

My engine code is ALH and it's a 1.9tdi 03 plate and I know it's 90bhp...

Thnx for ya helps

 

[Muttley]

ALH is a distributor pump engine, not a PD. If you take the engine cover off you will see the pump on the offside of the engine, driven by the cambelt, with four steel tubes coming from it and going to the cylinder head, to where you'd expect to see spark plugs on a petrol engine.

The pump does all the injection timing and duration settings and the fuel is pumped along the hard tubes to the injectors, which are spring loaded valves (but very well engineered ones).

There's a copy of one of VW's tech brochures that turns up on the internet every so often, currently found here

http://www.haywood-sullivan.com/vanagon/TDI/tdi-technik-eng.pdf

The back cover shows a nicely done cutaway engine.

I don't think there ever was a PD 90. I think 100 is the lowest BHP from a PD engine.

 

[Ibiza2000]

Top info I'll have alook for these fuel injector rails to confirm, that's maybe why my engine sounds alittle louder than new diesels as its a different older diesel engine?

It has a fsh and always had its oils and gear done in its intervals just sounds alittle loudish sometimes

So would I be correct in saying that a fault from my maf would not affect anything if I disconnected it? Icurrently have a non workin turbo, vag com says maf fault, so maybe disconnecting could eliminate that?

 

[Muttley]

It will sound - different - to a PD engine (which most people say sound very tractor-like at tickover) and certainly noisier than a modern Common-Rail diesel. But mostly it's down to how much sound-absorbing material there is in the engine bay.

Re: the MAF. If you disconnect the MAF and there is no difference in the performance of the car, it is almost certain that your MAF is dead and needs replacing.

Re: your turbo. The ALH engine is the only TDI 90 engine to have a variable-vane turbocharger, so it is possible that your non-working turbo is sooted up.

 

[Leon2012]

You've got a VE engine, not PD

 

[Ibiza2000]

So even if the maf sensor had gone and I disconnected there would be no impact on the engine? I was told if the maf had gone and I disconnected it the turbo would work

What's ve stand for? Yeah mine sounds like an ice cream can as the misus puts it lol

 

[Muttley]

"No Impact to the engine" is a very vague area.

The MAF provides input to the ECU on actual air mass (not volume, but mass, so taking pressure into account) being drawn in by the engine. The ECU uses that as part of its calculations to determine the correct amount of fuel to inject.

As it says in the pdf document I linked you to upthread, if the MAF signal is missing or unusable, the ECU reverts to a fixed value for the air mass, which reduces performance.

So if you disconnect the MAF and there is no change in the performance, the inference is that the MAF signal was already absent or being ignored, and that the MAF is faulty.

I don't believe that your turbo will spring into life if you disconnect the MAF, not under any circumstances.

When you say you have a non-working turbo, what leads you to believe that? If the turbo had failed you would see quite severe consequences, abysmal performance and depending on the nature of the failure, possibly lots of oil leaking out. If it was just a boost leak, the usual symptom is lots of black smoke out of the exhaust. What symptoms are you experiencing?

VE stands for Verteiler, the german word that in this context means "distributor". - Thanks to Leon2012 who told us that in a thread in the TDI engine section of the forum.

 

[Ibiza2000]

O ok then, so disconnecting would have no impact I was just told that on my 'old style engine' disconnecting the sensor would sort of bypass the set value mode, however according to that manual set value mode would cut the turbo out anyway due to default values,

The turbo is not blowin smoke or leaking oil, it's just not kickin in, I can feel it goin to then it don't, it had a maf fault code and a positive pressure deviation code, one persons sayin it's a maf issue the others sayin it's sticky vnts or vacume actuator, obvious both r xpensive fixs... Any ideas?

 

[Muttley]

MAF is relatively cheap and easy - less than £100 for a genuine replacement, and some secure Torx or 5-point bits to unscrew the old one.

I wish you wouldn't say "no impact", there will be an effect if you disconnect the MAF unless it is already faulty, in which case there is already an impact. Certainly not something you can disconnect and leave that way.

Positive pressure deviation is frequently logged when you have sticking turbo vanes.

 

[Ibiza2000]

Sorry I don't mean to sound so lament or loses when I say no impact,

A Bosch maf from Gsf is £56+vat on my engine, still kinda high for a shot in the dark

What would your next step be on this one? I realise cash has to get involved now but don't wana be goin from pillar to post, from personal experience where would u go from here, it's logged on vag com, if it helps the three faults were

-positive pressure deviation
-injection start timing
-mass air flow - I can't think if it was positive, negative or open circuit

 

[sssstew]

you can confirm before you start buying parts by putting vagcom on it and logging boost and maf as per :-

http://www.ross-tech.com/vag-com/cars/tdi.html

This will tell you if you need a new MAF. And should also show the boost spike due to positive deviation which is usually sticky turbo.

 

[Seatmann]

Here's a couple of good links for you ibiza2000

http://www.myturbodiesel.com/1000q/a4/a4-ALH-TDI-engine-index.htm

http://forums.tdiclub.com/showthread.php?p=569892

They're mostly golfs and jettas because they're american but the ALH is the ALH no matter where you fit it.
As sssstew says though, test things first rather than just throw money at it. In that first link especially is faqs for low power and limp mode (which is where the power dies but comes back when you restart the engine) and it's all for the ALH engine.
Anyway if you're getting constant low power and can't feel the turbo or the car runs out of puff about 3000rpm then it's most likely the maf.
As said the over boost could be sticky vanes or it could be a weak spring in the actuator but there only like £70 new.
The start of injection will either be the pump timing is just out or it could mean a new pump as the valve that controls it is built into the pump but even then you can get a second hand pump for £50.

 

[offitmassive]

How do u identify what engine u have? I would like to know if I have a pd90 really,

I'm unsure if I have the old style diesel or the peumpe deusol or how ever the fcuk u say it lol

My engine code is ALH and it's a 1.9tdi 03 plate and I know it's 90bhp...

Thnx for ya helps

a wide black plastic rocker cover is PD, a narrow metalic silver one in non PD

 

[offitmassive]

O ok then, so disconnecting would have no impact I was just told that on my 'old style engine' disconnecting the sensor would sort of bypass the set value mode, however according to that manual set value mode would cut the turbo out anyway due to default values,

The turbo is not blowin smoke or leaking oil, it's just not kickin in, I can feel it goin to then it don't, it had a maf fault code and a positive pressure deviation code, one persons sayin it's a maf issue the others sayin it's sticky vnts or vacume actuator, obvious both r xpensive fixs... Any ideas?

disconnecting the maf gives the ecu default values to run from. the car will run A LOT better with it disconnected if the maf is faulty. when you plug a faulty maf back on, the ecu then has incorrect maf values thus causing car to run slow and not willing to rev much