Master
After seven years of owning my 1999 td 5 I have NEVER had turbo lag at all.
I am now getting what I assume is lag some of the time when I have stopped at traffic lights etc and the car is warmed up.
I plant my hoof and nothing happens for a second or two. Very disconcerting.
Any advice welcome.What is happening to cause this?
Regards, Nick.
Last edited by worane; 22nd November 2017 at 09:23 PM.
YarnMaster
First of all check for oil in the ECU red plug and make sure that the wastegate actuator is not sticking
when you saydo you mean nothing happens with the rpm either? cos then it has nothing to do with the turbo cos the turbo should kick in only after the rpm is increasingI plant my hoof and nothing happens for a second or to.
Discovery Td5 (2000), manual, tuned
Wizard
Pull the MAP sensor out and clean it. It is located a the top middle of the intake manifold.
If that makes no difference you can try disconnecting (electrically) your MAF which is between the air box and turbo. The ECU reverts to know preset values instead. If this makes a difference there is a chance your MAF is buggered.
The error you're describing doesn't sound like turbo lag specifically. Just lack of response?
Wizard
Symptoms sound like an MAF sensor. So 2x jazzman’s advice.
Alternatively plug in a nanocom and check the airflow in the instrument feed display a flat line of 4 or so will indicate a dud sensor.
cheers
Steve
Master
I checked with Nanocom and the only fault was ambiant air temp.
This is only an interminent fault. most of the time it is working fine.
I have pulled and sprayed the little wires inside the MAF. Is this what you mean by the sensor?
Wizard
A dud MAF sensor may not throw a fault as it is still reporting a signal. You need go to instrument mode on the nanocom and see if the airflow reading changes as you drive. A flat line means it’s dead. A good sensor will peak in the 600’s when you floor it.
Yes the little wires inside the MAF housing are the sensor. But it’s increadibly fragile, so clean when only absolutely cold with contact or MAF cleaner and resist the urge to prod and poke it.
cheers
Steve
YarnMaster
see the ambient pressure live reading, it should be similar with the reaal pressure measured with barometer and drop 2-3 units under heavy throttle...if it's steady 100 it means it's on default and that will reduce the turbo pressure to 1 bar, you can clean this one too with MAF cleaner as to make sure that the little hole is not obstructedOriginally Posted by worane
Discovery Td5 (2000), manual, tuned
Master
Thanks for that Serrafery. That is the sort of info that makes this forum so good . Wonderful info.
YarnMaster
Welcome. The problem is that the AAP/T sensor(in te airbox) gives the reading for the ambient temp but this value is not monitored by tester and being in the same sensor with then ambient pressure there is a chance that the pressure side of it to be gone too then at least you know to replace the sensor cos this is one of the most expoensive sensors on the vehicle... eventually to check if it works on the temp side of it measure voltage across ground and the green/blue wire in the plug and blow with a hair drier on the sensor then the voltage must start growing if the sensor works... it should be between 0.1 - 5V but the real values are Offtrack's field, this is a very important sensor for the management so better rule it out
Discovery Td5 (2000), manual, tuned
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