Technical Throttle Valve opening?

[rolopolo]

Hi,
After having an EML/Limp mode the other night
Ducato 2.3 130, Euro 6, 2016

And p0639 throttle valve control, short to ground fault

I went for a run the next day, with Multiecuscan connected, throttle valve opening averaged 6-11%
With the odd fluctuations up to @18%

Picture is once engine off after the trip

I’m just wondering as from what I’ve read on old posts and tinterweb that it seems it should be about 84% open when running

With this in mind can anyone with a great deal more knowledgeable than me, confirm my thinking that my Throttle Valve is goosed?

Have a new one coming anyway, just peace of mind

 

[Anthony489]

Hi rolopolo. Older diesel engines have no throttle to the air supply, the power is altered only by injecting more or less fuel. Throttles started being fitted to help with EGR operation under light load for emissions purposes. If your throttle really was only open 18% the restricted air supply would make engine power pretty feeble and you could hardly fail to notice that. So I suspect that it is actually opening up (or staying open) but whatever sensor feeds back to the electronics it's degree of opening is not working.

 

[rolopolo]

For anyone interested,

Water in the block connector, corrosion in plug and terminals of valve,

New one fitted, after p for plenty electrical contact cleaner, and white grease to hopefully avoid more of the same

Now the road test results show the valve a steady 7% all the time, only blipping high then back at shutdown of engine

Fingers crossed, that was the issue

 

[Crossingkeeper]

So much the same issue as the earlier pre-mod throttle valves?

I had one of these on my 2009 build 2.3 van so having read about the corrosion problems, liberally sprayed the connector and valve with some old-fashioned ignition sealer (the stuff we used to spray on HT leads and distributer caps in the bad old days!)

So far so good......

 

[rolopolo]

Yeah, had them go on the old euro4 2.3 & euro5 3.0 and both had them changed,
Must say though
At least on 2.3 euro6 its position means, 3 simple Allen key bolts, with just the drivers headlamp removed to aid access and its swapped in minutes

The water is only the plug connector, so some progress has been made [emoji3]

 

[Esmolante]

I have suffered the same problem with that chunky throttle valve.


As my van has the EGR disabled, I don't need throttle valve anymore. So, I refuse to waste money on something that is harming the permormance of the engine (Diesel engines run in excess of air).


The solution I have found: Demunting the throttle body and extract the throttle valve, so that nothing interferes the air flux if broken or faulty (in my case, conection between solenoid and valve was broken).


After that operation, engine runs much better in low and medium revs. BUT... a TPS that it is not in diagrams (3 wires but actually connector has 4 pins) snitchs that something has happened with the throttle body, check engine light turns on and ECU enters in safe mode. ****.

So, the conclusive solution is EGR and throttle valve deleting with a remapping. 30€ and the problem is gone.

The guy that made me the job is in eBay (wsatmap-pt) but there are dozens more...

But, I insist. With the remapping check engine turns off, but if you have a broken throttle valve the problem persist (intermittent lack of power). It's necessary extract the valve and, then, remapping.