MPG gone down :(

vw55raz · Post by **vw55raz** » Sat Nov 22, 2008 8:51 pm

Hey all. Just recently upgraded my alloy wheels to the GTI ones on my polo. and i fit a k&N cone induction kit. and my MPG is gone a bit low. i got a 1.4TDi and gives around 60mpg, but now my fuel needle goes very low when the trip counter is on like 40miles after putting in over a gallon. Not sure what it is? could it be the rims and the induction kit , or could it be like a faulty sensor?

THanks

Tim_GTi · Post by **Tim_GTi** » Sun Nov 23, 2008 12:45 am

It won't have anything to do with the wheels.

It may be something to do with the air filter though,. If it's setup right the increase in air might have tripped something. Or an incorrect setup could be choking the engine.

How's the temperature?

If you can easily, get someone to run a diagnostics on it on vagcom.,

JayDee · Post by **JayDee** » Sun Nov 23, 2008 6:02 pm

The induction kit will be sucking more air into the engine. More air means itll need more fuel to burn it.

Bepe · Post by **Bepe** » Sun Nov 23, 2008 6:23 pm

thats not true JayDee, it can actually increase MPG as the engine is running more effiecently!

JayDee · Post by **JayDee** » Sun Nov 23, 2008 7:18 pm

going to have to agree to disagree mate

, Work for nissan see it all the time has to be the kits

vw55raz · Post by **vw55raz** » Mon Nov 24, 2008 10:37 pm

ok put in a tenner which normally gives me like 110 miles, and today ive got only 80.. something definetely going wrong. if sumthin wrong with the induction kit, would it come up on the vagcom?

Andy1.6 · Post by **Andy1.6** » Mon Nov 24, 2008 11:46 pm

Well it definitely isn't the wheels!! That's as far as my knowledge goes! But I wish i got anywhere near 110 miles from a tenner!

JayDee · Post by **JayDee** » Tue Nov 25, 2008 10:24 pm

Its the kit mate, tell you what take if off see how it goes, if its still doing it then at least its cancelled the kit out...?

Bepe · Post by **Bepe** » Tue Nov 25, 2008 11:10 pm

just because it has gone out by 20miles doesnt mean there is something wrong mechanically, id say its the atmosphere, using the heating more, etc petrol doesnt ALWAYS last the same or in this case diesel, but the induction kit will have minimum affect on a car engine this size

vw55raz · Post by **vw55raz** » Tue Nov 25, 2008 11:14 pm

Bepe wrote:just because it has gone out by 20miles doesnt mean there is something wrong mechanically, id say its the atmosphere, using the heating more, etc petrol doesnt ALWAYS last the same or in this case diesel, but the induction kit will have minimum affect on a car engine this size

come to think of it, i have been using the heating a lot. let me cut down on it and see how it goes, and if it dont work, ill try putting old airfilter back on

JayDee · Post by **JayDee** » Tue Nov 25, 2008 11:23 pm

Good shout mate, mind you the heater usually takes the heat away from the engine making it run better. You wont be usin the air con though

Tad cold lol

vw55raz · Post by **vw55raz** » Wed Nov 26, 2008 9:56 pm

ok didnt use the heater at all today and its been runnin better. Just need to top another tenner again and run a test and will let everyone know the results

JayDee · Post by **JayDee** » Wed Nov 26, 2008 10:52 pm

Had some spare time the day at work, found out when youve got the heater on its puttin extra load on the engine...mite well just be that mate