MPG issues...

Andybtsn

Andybtsn

Andybtsn

Don
Joined
23 Oct 2005
Posts
44,405
Location
North Yorkshire
I knew the MR2 N/A wouldn't produce the best MPG in the world, but I thoughtit would be better than this.

The car itself has been sat for a while and needs a service which it will be done next week by my local garage, what possible problems could there be to affect fuel consumption?

I got 75 miles to £20, all motorway miles, from a 2.0 16v engine I would have expected better MPG, of course I didn't buy the car thinking I would have got decent MPG, but I'd like to rectify the situation instead of throwing away money. I would have expected 100 miles at least? I have filled it up twice now, both times £20 so it isn't a one off.

I know lambda probes are renowned for causing bad MPG, what do you think? I have asked on MR2oc but no real explanation.

Thanks
 
Have you worked out the mpg accurately by filling the tank all the way, reset the trip counter to zero, drive until the tank is empty and fill up all the way again.

Use the amount of gallons you fill up with the 2nd time and the miles your trip counter says to work out your mpg.
 
Guv said:
Have you worked out the mpg accurately by filling the tank all the way, reset the trip counter to zero, drive until the tank is empty and fill up all the way again.

Use the amount of gallons you fill up with the 2nd time and the miles your trip counter says to work out your mpg.
Click to expand...

Yeah I ran the car till the petrol light came on.

Didn't work out my MPG, but I learnt people get 60-70 miles to £10, so something is deffo wrong, I can't afford to drive the thing quick at the moment!
 
To be honest, just putting £20 in and running it until the petrol light comes on isn't that accurate. It will give you a very rough idea but no where near accurate.
You really need to work out the mpg accurately, you can then work out how many miles you get to £10, £20 etc. accurately.

That's what I'd be doing if I was concerned my car wasn't getting the mpg it should be anyway.
 
No way is 75 miles from a 2.0 accurate. My 2.0 306 with 167 bhp did 160 miles on 20 notes.

Even my 2.8 thing does more than 75 miles on £20. Sometimes.

Actaully you have got me thinking now, why did my 306 get 160 miles with 167bhp but my VR6 get only 70-100 miles on a "mere" 200 odd bhp. Seems like a lot of juice for the power. :( Oh well atleast it goes well and sounds nice (keep telling myself that!!)
 
If you could do a proper test that would be great, i'm currently looking for an MR2 and this sort of thing could tip me back towards MX-5 territory :p
 
Sorry to be the bearer of bad news but I can get circa 300 miles to £40 worth of fuel! Summats wrong lad! Unless you're driving with your foot to the floor the whole time you're driving anyway.

I've also got a 2.0 GTi-16 (n/a) and the book figure is 30mpg but i was able to get over 40mpg only a long motorway run. Give it a service, oil / plugs / lead / dizzy cap and check the ECU for error codes!

Tells you how here, page number 342!!-
http://www.nut-shells.com/mr2/manuals/RM179U1.pdf
 
Car went into the garage for service and check for MPG problem.

I got a call from the engineer saying that there was a lot of black smoke coming from the exhausts, and he thought there was a piston failure of some kind, basically something bady wrong on the engine. :(
He was going to confirm this with a few phone calls etc and see if he could shed any light on the problems.

Later in the day, he phoned me back to say they had some a compression test on the engine and it was ok afterall (wahey!) but the emissions test went off the scale.

So, there currently looking for reasoning why it's burning so much fuel, a Toyota engineer is going in tomorrow to see if he can find anything.

I think there checking the sensors tomorrow, i guess the lamdba is the problem.
 
Just sounds like its running very rich indeed, a fuelling problem no doubt caused by a problematic sensor.

Piston Failure :confused: , if you had a piston failure id doubt you'd be able to drive the car let alone get onto the motorway in it :p
 
They must have just come to the conclusion it melted the minute I drove it in the garage :D :p

Hopefully it's just the sensors and I get it back tomorrow!
 
The garage probably thought a piston ring had failed, not the first thing I would look at, but if the engine sounded rough and there was black smoke from the exhaust I think a compression test would be a quick way of ruling out any problems.
 
£20, thats roughly 4.5 gallons, so 75 miles = 17MPG.

On all motorway, my 3.2 litre automatic, with 5 people and a jam packed boot managed 27.

17mpg is 4x4 V8 territory.

As has been said you're not using the best method of calculating your usage, always best to brim the tank really. But still, its clear to see there's most likely a problem. Unluckly mate, hope it gest sorted soon.
 
You must log in or register to reply here.
Back
Top Bottom