Hi folks

My 2003 1.9 JTD Doblo Cargo is having issues!

It is getting starved of air. If I undo the inlet joint it will run, if I do it back up it dies. The mechanic said that the MAF sensor is working fine and the issue is after that to the inlet.

I have undone the intercooler pipe to the inlet at the bottom. If I reconnect it without a clip the turbo blows the pipe off, so I presume the turbo works?

Any ideas would be great.

Thanks.

paulk123 said:

Hi folks

My 2003 1.9 JTD Doblo Cargo is having issues!

It is getting starved of air. If I undo the inlet joint it will run, if I do it back up it dies. The mechanic said that the MAF sensor is working fine and the issue is after that to the inlet.

I have undone the intercooler pipe to the inlet at the bottom. If I reconnect it without a clip the turbo blows the pipe off, so I presume the turbo works?

Any ideas would be great.

Thanks.

Click to expand...

Air supply..
Or air metering....

The flow is measured..and you are changing the volume of air flow.

Remove filter..see if its any different.

Sounds like a sensor issue.. or interpretation by ECU

Maybe try the old trick of removing battery power overnight.

The ECU will then return to factory presets..
And LEARN new running settings as you drive

Without knowing the full intake route on your vehicle your description does not pinpoint anything for me.

However, follow the air route logically and you should find the blockage.

I'd expect the following.

Air intake near front of vehicle, into air filter.
From there to the turbo.
From turbo to intercooler.
From intercooler to engine, via any sensors such as the MAF.
Lots of pipes and connections.

Start bu looking at the air filter. If it has collapsed, or broken up, bits will be sucked through to create a blockage. Especially so if water has been ingested from a flooded road, as a damp air filter becomes quite fragile. A new filter may suggest recently replaced after the old one broke up.

Check pipe from intake opening to filter. Is it clear, or had it collected debris. Plastic bags blowing in the wind can be ingested, they block the airflow a treat.
If clear to filter, follow from filter to next pipe joint. Disconnect each joint and check pipe is clear.
Follow through all the way to the engine. Somewhere along the line you will determine where the blockage is. Then all you have to do is remove it. Might be a challenge if the intercooler is stuffed with filter debris.

Has it been unused for a while? Mice like to nest in air filters, and as soon as the engine tries to start, the chewed up paper gets sucked through. Sometimes with a surprised mouse, so be prepared for dead creatures.

Might be a lot of work, but fix should be cheap, unless intercooler is stuffed.

Thanks folks.

I took everything from the inlet to the intercooler off. There is a butterfly in the elbow that was a bit sticky. Hopefully that will be the cure!

Do let us know..

Yes, it was that valve. anyone know what it's for? i've taken the vacuum off of it for now.

Better to attack it with carb cleaner and get it unstuck and operating properly. A nice job for Christmas morning while waiting for dinner.

I had this exact issue too. My turbo inlet hose was clogged after 10 years due to the pcv system. Air filter was also due. The oily residue also harden and cracked my turbo inlet hose and a replacement was about $100 so i just took a 2.75 inch to 1.75 inch silicone reducer to connect the turbo inlet to the maf sensor then just stuck an open pod on it. The entire intake is now just under 8 inches. Added benefits of loud turbo induction noise and significantly less black smoke under hard acceleration. Turbo spools a lot quicker and holds the boost better up top. You would need to plumb up the pcv system elsewhere though. It is quite a gain for a $5 mod if you have an open pod laying around.

paulk123 said:

Yes, it was that valve. anyone know what it's for? i've taken the vacuum off of it for now.

Click to expand...

The valve is to prevent a scenario when you have a runaway diesel. It is to shut the air flow when your engine runs away.

I've taken it of and cleaned it.
Running fine now but then I noticed the water pump is leaking :bang: