Mk3 8v questions

[ashbreed]

Hey guys, just a few questions that I need answering...

I got my golf bout a month ago now. Paid £280 on flebay!! Proper bargain!! 2.0 8v 135k on the clock! It always seemed slightly low on power, gave it some new oil n sparks n it seemed to respond quite well, but still slacking. I've never been in another mk3 8v gti so I dunno if it's just me bein picky.

The car drinks petrol like a binge drinker out on a all weekend bender!! It runs rich!! It's got an induction kit on it (which I'm taking off don't worry!) took it on a 100 mile round trip down th m11 and m25 my average mpg was.... Wait for it.... Wait..... 24.5 mpg!!!!!!!! WTF!!!!!! I refuse to believe that an induction kit refuses efficiency by that much! Advise on what that could be please?!

The next thing was the revs, at 70mph I'm sittin at @ 3200 rpm, 80 @ 4000 rpm and a ton+ is almost touching the red! It's that normal? Again I don't know cos I ain't been in another 8v. It just seems a bit high to me...

The final thing is when I bought it the previous owner said that the clutch was slipping... I ain't experienced any problems and I've ragged the nuts of it trying to find out if it's slipping! Would clutch problems contribute the the high revving?

Cheers guys, any advise is appreciated!

[Christo77]

Hi there, welcome..
I'm sure you'll hear lots of jibes about the power of the ole 8valve.. it's not exactly slow..it's just not particularly fast either..plenty of pros and cons from the guys though,
Fuel consuption should be better really, probably wants a good service and setting up.
There's some items to look at like cleaning the throttle body and water temp sensor that could count for your poor mpg..amongst other things..
Do some searches ok..you'll soon see what things to check.

If i remember rightly 70 on mine is a frac under 3000rpm, in top gear of course!.. completely standard 8v, rims/tyres etc


Christo

[Wayne]

What year is it, in fitting the induction kit the last owner did not bin the maf sensor did they.

Your revs sound about right, from memory @ 70 mine was just over 3k.

[ashbreed]

The maf is there but if it works is a different question!
How would I clean the throttle body? What about modified/ polished throttle bodies? Has anyone done that b4?
I'm thinking get a standard box, cold air feed to it and check the maf that shud sort that out!

[Christo77]

Standard airbox good idea, at least you'll get back to square one and know where you stand mpg wise..then make any changes from there,

Do a search 'throttle body cleaning' or similar..there'll be loads of info.. but the throttle body (top back of rocker cover)  you need to get into each side of the butterfly valve and clean in there with carb cleaner until shiny new again..

[ashbreed]

Iv just Replaced the original air box and filter and took it for a spin...

Still no good! However my mpg is going between 22 and 23 mpg from running around town and on the motorway. I just don't understand!

[javalin]

change the coolant temp sensor.

[ashbreed]

Coolant temp sensor? How comes?

[Khare]

Because it determines how much fuel goes in. If the sensor is faulty it will run with the same map as when the car is cold, which is heavy on fuel until it warms up.

[AudiA8Quattro]

When the coolant sensor is faulty, the ecu usually uses a set 80 degrees.
The sensor could still fool the ecu that it is still working, so its worth changing.