Thornewa
Member
Pulled the cover off and used actuator function to check function, seems to be working fine, however there was a fair amount of oil in there as well!
Technical Poor performance on 2016 3.0 Ducato
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Technical Poor performance on 2016 3.0 Ducato
Pulled the cover off and used actuator function to check function, seems to be working fine, however there was a fair amount of oil in there as well!
Thornewa
Member
If no obvious signs under bonnet, if possible squeeze the inlet hose after the turbo but before the inlet manifold and get someone to start engine and give it a few revs, you should feel the hose expand under your fingers.
At least it will indicate if you have some boost pressure.
Another sign of an air leak on the pressure side would be any whistle like air escaping.
Only do any testing if you feel safe to do so.
Im not sure where that one is, is it over the back of the engine?
When throttle reads 5 % is that nearly fully open or nearly closed?
You are doing great ruling things out.
Could unplug throttle valve when it is fully open and then test drive-if no difference throttle valve is not closing and strangling air flow into engine.
You are doing great ruling things out.
Could unplug throttle valve when it is fully open and then test drive-if no difference throttle valve is not closing and strangling air flow into engine.
Thornewa
Member
The 5% seems to be constant on a run, we have some fairly step hills around here which is great for testing and i have driven it spirited in the testing, but that valve does not change
Yes I'm wondering if it is 5% open or 95 % open
Thornewa
Member
Good point, how can i check that? i'll do some digging, would that explain the lack of boost?
Unplug throttle valve when it's fully open test drive. Plug it back in after then delete fault codes caused by running disconnected.
Or mes read opening amount engine running looking at throttle plate -make 100%sure nothing could be sucked into engine.
Is the air filter blocked or any air inlet hoses? Sorry if that's already been covered.
ZaphodB
Established member
5% open, so virtually closed off.
It's only there to work with the EGR system
It closes the ensure it sucks more EGR than intake
It's only there to work with the EGR system
It closes the ensure it sucks more EGR than intake
Interesting.....when throttle plate fully open disconnect electrical plug then test drive
ZaphodB
Established member
Tuners usually disconnect it when they do an EGR delete. so it should normally be open.
Thornewa
Member
Test drive completed and drives same as before builds boost then dies off at 2500rpm.
I'll check airfilter pipework for blockages over the weekend and possibly revisit the MAF ( to double check) it was serviced 8k ago and the garage did smoke test the pipework when they had it.
I will also check the boost pipe sugggested above.
Any ideas where to look next?
I'll check airfilter pipework for blockages over the weekend and possibly revisit the MAF ( to double check) it was serviced 8k ago and the garage did smoke test the pipework when they had it.
I will also check the boost pipe sugggested above.
Any ideas where to look next?
ZaphodB
Established member
So we can keep track, what did you do/remove/disconnect before this test drive
A small point, doesn't the throttle body have to be able to close when ignition switched off as a safety device when diesels choose to run on.
A small point, doesn't the throttle body have to be able to close when ignition switched off as a safety device when diesels choose to run on.
Hi,
The anti run on valve flap common on vag diesels is just to stop the engine rotating slightly more quickly than without valve-came about when people were switching from patrols to diesels and freaked out when diesel engine didn't stop making a noise immediately they key turned to stop.
Not fitted to trucks or heavy equipment.
Jack
ZaphodB
Established member
Worth checking the stuff in this video
Cable connectors and corrosion.
And yes as reiterated in the video it's not a throttle body really, it's a valve coupled to EGR operation/emissions
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My mistake, I was thinking it stopped a diesel from running away on engine oil etc.
I only saw it in person once, strangely enough on an old Fiat Scudo, oil had collected in the inlet manifold.
One owner from new , who had done all his own servicing, it turned out he only topped up the oil, never changed it.!!!!
ZaphodB
Established member
Mind you at current Dealer labour charges and I did save his engine by stalling it after dragging him from the vehicle????
Thornewa
Member
I removed the plug to the throttle body, but checked it was still in open position which it was. I also checked it was in the open position with plug connected and when idling it also remained open also.
