D2a Td5 power issue
The td5 in D2a has had some power issues for a long time, but its finally got to me enough that I want to spend some time and fix it.
I know its probably a case of going through and doing some logical fault-finding of sensors etc, but hoping someone may have had a similar issue or is familiar enough with them to suggest a good starting point.
So, the situation.
Firstly - its an auto. EGR deleted, but other than that is stock. No re-map etc.
Had a new injector loom a couple of years ago.
I've got a Nanocom for troubleshooting.
From standstill its a lethargic slug until it comes on boost then it pulls reasonably well from just over 2000rpm until it changes up. That's pretty normal AFAIK, so not an issue as such.
Sometimes when accelerating, it pulls well, upshifts and when the revs drop back (low 2000's) it feels like its just gone flat. I'd describe it as feeling like it does before it comes on boost. You can keep the throttle the same, it upshifts, and then it just bogs down and won't keep accelerating. Can happen in any upshift, but its not consistent.
If you force it to downshift either with throttle or gear selector it still doesn't have normal power, but then after a few seconds builds up and you're off!
Another upshift and it may be normal or it may repeat the lack of power.
Similar issue - I can get the power issue when cruising along - put your foot down normally to accelerate and its like nothing happens.
Force it to downshift and its hit and miss whether it improves immediately with the downshift, or needs a few seconds to come right.
Basically means I don't risk overtaking unless I've got a couple of k's clear road ahead.
I'm occasionally seeing a driver demand fault, and a very intermittent crank sensor fault. I can't recall the exact codes but will note them down next time I see them.
Neither seem to be directly related to the behaviour above - ie I can experience the power issue but no fault logged.
Any suggestions on where to start??
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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