300tdi down on power
Currently working through an issue with my 300tdi 130 being down on power.
I did a 500km round trip yesterday with a trailer. Everything was normal on the way there - cruising at just over 100kmh in 5th.
On the way home I could only manage 90k's on the flat - and that was in 4th as there was no way it would pull 5th gear.
Empty trailer on the way there, and only a ride-on mower - about 300kg and a bit of wind drag - for the return trip.
It feels like the engine just isn't coming onto boost. At 90k's in 4th there is throttle response to about half pedal - but pressing the pedal further after that makes no difference. If you put your foot to the floor you can lift up to about half travel before any reduction in power.
It was an on-road trip, so no 4WD/mud/water etc involved. Same tank of fuel on the return trip.
Engine is 100% standard with zero tweaks done to the fueling etc.
Unfortunately no boost or EGT gauges fitted so no clues there.
Investigating today from a low boost/fueling perspective - so far I've done the following with no improvement or obvious issues found:
- Removed and cleaned the fuel sedimeter - only a small amount of crap
- Changed the fuel filter
- Removed the turbo inlet hose and checked the compressor - looks fine and is spinning with engine running
- Removed the top intercooler hose and checked that the turbo is providing some boost when the engine is revved
- Checked that the injector pump boost sense hose seems OK - blanked one end and blew into the other to check it was holding pressure (it was)
- Removed the boost sense hose from the IP, fitted a bit of tube and blew in that to make sure the diaphragm isn't obviously leaking/split.
- Driven it again today without the trailer after doing all the above - definitely down on power and only just makes 100k's on the flat.
I think the next thing I'll do is hook up a boost gauge and see what its doing, but thought I'd post the issue here in case I'm missing something obvious.
Steve
1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
1988 120 with rust and potential
1999 300tdi 130 single cab - "stock as bro"
2003 D2a Td5 - the boss's daily drive
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