CL9. Car feeling sluggish and better fuel econ?

**kiiraaraa** · 02-12-2012 10:35 AM

Hey hey
I think there's something wrong with my car but I don't know what it is?

So about the car, its a 05 luxury auto and its sitting on about 85,000km and it's only ever been filled with bp ultimate. Owned since new.

The problem is that recently (past few weeks), the car has been getting more out of a tank than usual. Normally, I'd get roughly 420-430km before the indicator comes on but now it goes up to 450-460. I've also noticed that the car feels abit sluggish, lack and power and the car taking longer to rev than usual, this is much more noticeable when I'm going up hill. Nothing's been changed on the car recently so not sure what's going on.

Any ideas?

**curtis265** · 02-12-2012 11:48 AM

sounds like your ecu has made some kind of change to suit the weather or something

how sluggish are you talking about? Can't race it? Can't keep up with a bus?

**kiiraaraa** · 02-12-2012 12:59 PM

It's not completely slow, it feels like its 'slower' by 20-25% if that makes sense?

When I was going uphill on a steep incline yesterday, it sat on second gear at around 70km/h and it barely rose at all.
I did it again the second time and it went as it would usually, went to around 100/110 at 6-6500 rpm on second.

Not sure if its back to normal or not now, any idea if there's any particular type of maintenance or parts replacement I should do?

**Fredoops** · 02-12-2012 01:21 PM

sounds like ECU.

All you have to do is reset the ecu to restart the cycle.

**-[NoS]-** · 02-12-2012 01:51 PM

how do you reset the ecu?

**Fredoops** · 02-12-2012 01:51 PM

disconnect battery for 10m, reconnect.

**-[NoS]-** · 02-12-2012 01:57 PM

brb... lol

**kiiraaraa** · 02-12-2012 02:37 PM

If I have a aftermarket head unit, would my settings for that be reset as well if I disconnect the battery?

**dr1ft3r** · 02-12-2012 04:19 PM

Originally Posted by kiiraaraa

If I have a aftermarket head unit, would my settings for that be reset as well if I disconnect the battery?

yup......

**kiiraaraa** · 03-12-2012 01:28 AM

Okays, I resettled the ECU and went for a drive earlier. It feels like its back to normal, I did a pull to redline on second when I went on the motorway and it rev'ed fine.

Good advice there, thanks. I'll post again if the fuel econ is still off.

Cheers