2.8 tgv diesel (big 300tdi ) power loss any ideas?

**finallyrangie** · 29th January 2016, 06:45 PM

Hello clever people

I have a 2.8 tgv diesel engine, basically a reworked and enlarged 300tdi, in a p38 range rover, I know , it seemed like a good idea at the time!

Straight after the engine swap (a couple of years ago now ) I was more than happy with the performance, mud tyres have slowed her down a bit but still no trouble keeping up with traffic or getting up hills, but over the last few months things have changed, I am way down on power, egt gauge has been on since the swap is now reading silly Temps at even moderate speeds, but that might be because of the large throttle openings to make it move. Starts after a few turns in the morning, used to be instant, but will go straight away for the rest of the day, revs roughfor a few blips of the throttle then will Rev okay up to about 2300, fights to 3k then seems to get a second wind and sets off towards 4k, but by then the egts are up and I am not happy about pushing it any further and back off.

So far I have,

Checked the lift pump, seems fine and fired diesel all over me when I tested it.
Changed the injectors, then bled the system
Checked all the valve clearances, changed a few
Panicked when I had no boost before I found the intake hose that had escaped .

Where should I go next, suggestions on what to look for and how to look for it greatly appreciated

Sorry it's a long post trying to get all the info in there so as not to waste anyone's time

Thanks in advance for any help

**LandyAndy** · 29th January 2016, 07:23 PM

From memory those motors have a VNT turbo dont they???
We recently had a truck at work with similar problem.It was the turbo,the VNT had lost its variable function.
Unsure how you check on a non electronic instal,ours showed up as a electronic fault logged.
Goodluck
Andrew

**rick130** · 29th January 2016, 08:43 PM

What you are describing is a classic lack of boost.
The actuator rod wears on the VNT vane mechanism and stops the bloody thing working.

Really common problem with them.
Pretty sure uninformed posted a photo here a year or two back.

**finallyrangie** · 29th January 2016, 08:54 PM

Boost gauge says a healthy 20 psi at 1500rpm, that's what I am struggling with, I have plenty of boost and high egts, not sure what is making it work so hard, I even went so far as to check if the brakes were binding when it started happening, now it's definitely an engine issue

Thanks for the suggestions, keep em coming I need all the help I can get

**rick130** · 29th January 2016, 09:01 PM

Hmm, that blows mine and Andy's theory, doesn't it !

OK, some sort of air restriction.

Blocked air filter, delaminating hose (internally)

Dirty intercooler (oil internally and dirty externally)

**finallyrangie** · 29th January 2016, 09:28 PM

Boost gauge is plumbed in at the intake, so 20 psi going into the engine, all hoses are silicon so shouldn't be delaminating and the intercooler wasnew when the engine was installed, the inside of the hoses actually look pretty clean, I had some of them off to check for blockages

**finallyrangie** · 29th January 2016, 09:31 PM

Also new air filter, just in case

**roverrescue** · 29th January 2016, 09:36 PM

As per rick list but also add in timing
Check the plunger lift at tdc

**finallyrangie** · 29th January 2016, 10:08 PM

Is it possible for the timing to change once it's set, would that be a timing belt jumping a tooth thing, I say that sounding like I know, can it happen?

**rick130** · 29th January 2016, 10:08 PM

Originally Posted by roverrescue

As per rick list but also add in timing
Check the plunger lift at tdc

That's about the only other thing.
When you checked the tappets, the lash caps were all Ok ?

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