Thread: D2 td5 slow

Hi Ian

I suppose the first thing is to get some solid data to base a diagnosis on rather than gut feels.

See if you can find/drive another std td5 disco to compare performance. In my case after coming from a v8 Rangie and the other cars in my fleet, the td5 was distinctly sluggish, but that was normal and I got used to it.

Fuel economy. I'm getting just on 10l/100km on the open road and low 12's in town traffic. Towing mid high 15’s.

EGT system shouldn't effect performance.

Dud MAF sensor will. To check the sensor ideally you should plug in a Nanocom and look at the airflow readings in the instrument section when you go for a drive. Flat line equals dud sensor or a wiring fault. 50 at idle to 500ish flat out is good. Alternatively check the resistances across the connector pins. Don't have the ohm values for a good MAF to hand but there are a number of threads on this site which have them. You'll need a reasonable quality multimeter as the cheap ones don't read resistances high enough.

As to the auto a dud MAF can effect it's behaviour. Again plug in a nanocom and see if there are any auto transmission faults logged. also check for oil at the orange ecu plug as this can cause erratic behaviour (and caused my car to throw a couple of auto faults). Beyond that I can't offer any concrete advice.

Cheers

Steve

Ps I see you are just up the road so send us a pm with your details and we can arrange a time for you to come down compare cars and I can plug the nanocom in.

Hello Ian,
You are in Perth ?? I am NOR in beecboro if you are up this way I can put my evo on it have a look I will send you a PM
Ian

From my recent experience check your intercooler hoses.
Mine was sluggish particularly on hills under load.
My fault was in the intercooler to manifold hose.
It was leaking under the larger end near the intake manifold loosing boost pressure.