Loss of boost.

[Rich Green]

Morning guys. After an engine rebuild following a cambelt failure I have noticed a lack of boost. There was never a lot on the 105bhp 2.0tdi but it’s noticeable on hills. I’m going to return it to the garage who did the work as a warranty issue but does anyone have any ideas what may have caused this? Seemed ok before I’m guessing a pipe fitted wrong or something?

 

[Spaghetti]

First thing I’d check is the diagnostics then look/listen for a boost leak from the pipes or intercooler. Can you hear the turbo spool up?

 

[Dellmassive]

Any loss in boost pressure should flag a diagnostic code. And possibly a engine light.

So as above scan for codes first to give you some direction.

 

[Rich Green]

Hmmmmm I have no warning lights? Can’t hear it spooling up but my hearing is shocking. Maybe I just forgot how slow it was???

 

[DXX]

Pull the inlet hose off the charge air cooler and run the engine, you will soon see if there is any boost pressure. You might even find the rag the mechanic left in there!

 

[Rich Green]

Pull the inlet hose off the charge air cooler and run the engine, you will soon see if there is any boost pressure. You might even find the rag the mechanic left in there!

Any idea the best way of explaining how I find that? Sorry I’m a sparky! Fairly handy but not so with engines.

 

[DXX]

Sorry, just realised it’s a CAAC engine (is it?), you don’t have a charge air cooler, you have an intercooler.
You can disconnect the hose into the throttle valve body and check the turbo charger is discharging air, as others have said you should have a fault code and if you haven’t removing this hose will probably cause one. That’s the large black hose on top of the engine where it connects to the throttle valve body.
You may even be able to squeeze this hose and feel a difference with the engine stopped or running as stopped it won’t be under pressure, you’ll need to give it some throttle to raise the boost pressure.
If it’s under warranty and close by I would take it back to the repairers.

 

[DXX]

You mentioned cambelt failure, no idea how quickly the engine stopped turning but if any debris from clashing piston crowns / valve heads passed into the turbocharger exhaust turbine it may have caused further damage. The mechanic should have checked this If the valves / pistons were missing material.

 

[Rich Green]

You mentioned cambelt failure, no idea how quickly the engine stopped turning but if any debris from clashing piston crowns / valve heads passed into the turbocharger exhaust turbine it may have caused further damage. The mechanic should have checked this If the valves / pistons were missing material.

Yeah he did show me all the damaged and replaced parts I didn’t see anything missing any chunks of metal.

 

[Rich Green]

Yeah he did show me all the damaged and replaced parts I didn’t see anything missing any chunks of metal.

I’m hoping it is something simple or the missis will force me to put her up for sale hahahahaha

 

[DXX]

I’m hoping it is something simple or the missis will force me to put her up for sale hahahahaha

Good news nothing missing and it probably is something simple.