Thread: Startup sluggish

Hi McLaren, I was behind you at MR when you picked your Disco up Saturday week ago , nice looking wagon watched you drive up the road which was good as yours hung in 1st for ages like mine [ I am starting to worry less over the auto now].
I'm new to Disco's and TD5's myself but have a look at the turbo waste gate and it's hoses, there are video's on you tube about it, sorry have not taught myself how to post a link yet.
Have you noticed this before the service or only after, if you take the intake hose off you can see the little solenoid [modulator] that controls the waste gate, it has small vac hoses on it make sure they are ok tight fitting and not spongy.

As i said i'm new to these trucks too I'm sure the more knowledgeable guys will be along soon.

Originally Posted by whitey56

Hi McLaren, I was behind you at MR when you picked your Disco up Saturday week ago , nice looking wagon watched you drive up the road which was good as yours hung in 1st for ages like mine [ I am starting to worry less over the auto now].
I'm new to Disco's and TD5's myself but have a look at the turbo waste gate and it's hoses, there are video's on you tube about it, sorry have not taught myself how to post a link yet.
Have you noticed this before the service or only after, if you take the intake hose off you can see the little solenoid [modulator] that controls the waste gate, it has small vac hoses on it make sure they are ok tight fitting and not spongy.

As i said i'm new to these trucks too I'm sure the more knowledgeable guys will be along soon.

Nice cheers mate sorry for late reply never came up anyone had!!
Was doing it before and after
I find if I let warm up for 5 mins no dramas but if I take off straight after starting it's like it limited for 1/2 secs then everything all ok

Originally Posted by Mclaren00

Nice cheers mate sorry for late reply never came up anyone had!!
Was doing it before and after
I find if I let warm up for 5 mins no dramas but if I take off straight after starting it's like it limited for 1/2 secs then everything all ok

If it's an EU3 engine (or even an EU2 running an EU3 map) it's possibly a faulty MAF. The ECU has a delay of about 30 seconds before it errors cause a switch to MAP/IAT fuelling.

it willl only happen if the MAF output is very low at idle, so disconnected or airflow in the low 40s.

i haven't seen this happen personally, but one of the uk tuning companies asked me if I had a fix for the 30second timeout for a Race truck running an EU3 motor without the MAF. So I spent a bit of time looking at which conditions trigger this.

So to test just disconnect

Originally Posted by Mclaren00

So to test just disconnect

I don't think that will really identify cause.

The disconnect will work if you have a MAF that is misreading badly but still giving something like 50kg/hr at idle.
In that case the ECU continues to run on the MAF, and performs badly as a result, so disconnecting the MAF gives good indication it's off colour.

What I suspect could be happening occurs when the MAF is reading less than 45kg/hr at 760rpm.
That is the equivalent of a MAF voltage of about 1.7V cf normal reading which is around 2.0V at idle.

So you can back probe* the connector on the MAF to measure the voltage with a multimeter.
Alternatively see if someone can hook up a diagnostic tool to check the live data for the MAF.

* How to back probe any sensor. | Enduring Automotive

Awesome info mate cheers
Nanocom next on things to buy so I'm guessing that should give me an idea?