what would cause real poor fuel economy??

[maxrs4]

any ideas?! im guessing fooked lamdas would- im getting no faults on vagcom!
what else

[pegbox7]

what do you call poor ?

[UKS4APR1]

Coolant Temp Sensor ?
(tells ECU engine is cold all the time so overfuels)

[ollys]

any ideas?! im guessing fooked lamdas would- im getting no faults on vagcom!
what else

stuffed maf?

[maxrs4]

im gettin about 20 miles for a tenner, i have replaced the coolent temp sensor.

[Contigo]

Does the car get up to temp?

[Norrs2]

any ideas?! im guessing fooked lamdas would- im getting no faults on vagcom!
what else

stuffed maf?

Agreed, this can cause real bad consumpstion. Won't always show up on VAG-COM either! My S2 was only getting 150 miles on a tank when the MAF was shot, and that was taking it easy!

[juice]

how long you had the car?

if you have just aquired it, i would change the maf, dv's to 710n's spark plugs and that would leave put lamda last to change.

[maxrs4]

how long you had the car?

if you have just aquired it, i would change the maf, dv's to 710n's spark plugs and that would leave put lamda last to change.

not very long had new dv's and had new spark plugs and had one lamda changed i dont remember its had a maf its also had new coolent temp sensor

what should the plugs be gapped to?!

[DutchRS4]

vacuum leaks. Check/replace all vacuum hoses, if not already done.

[maxrs4]

Does the car get up to temp?

not really when i just cruise about i might just move off the min- if i open it up or its a warm day runs about the middle

vacuum leaks. Check/replace all vacuum hoses, if not already done.

are we talkin the upper ones like going to an from the actuators fuel pressure reg etc?

there are two vacuum valves of some sort that have been remved at the back of the engine but are left plugged in!?

[DutchRS4]

vacuum leaks. Check/replace all vacuum hoses, if not already done.

are we talkin the upper ones like going to an from the actuators fuel pressure reg etc?

there are two vacuum valves of some sort that have been remved at the back of the engine but are left plugged in!?

This sounds strange. I can't visualise what you're meaning here. Could you maybe post us a pic?

[rickoshea]

Does the car get up to temp?

not really when i just cruise about i might just move off the min- if i open it up or its a warm day runs about the middle

Sounds like the Thermostat or sender unit. I'd change the sender unit first - otherwise it's a £700 bill for a new thermostat

[DutchRS4]

Does the car get up to temp?

not really when i just cruise about i might just move off the min- if i open it up or its a warm day runs about the middle

Sounds like the Thermostat or sender unit. I'd change the sender unit first - otherwise it's a £700 bill for a new thermostat

Are you talking about the coolant or oil temp gauge? Good to know before starting to replace things.

[maxrs4]

Does the car get up to temp?

not really when i just cruise about i might just move off the min- if i open it up or its a warm day runs about the middle

Sounds like the Thermostat or sender unit. I'd change the sender unit first - otherwise it's a £700 bill for a new thermostat

Are you talking about the coolant or oil temp gauge? Good to know before starting to replace things.

i have replaced the coolant temp sender unit already,
neither the water or oil get very warm unless ur giving it beans the oil is what id expect prob 70 if just cruising the water runs very cool, most of my other cars have warmed up to bout 90deg and stayed there unless in traffic or getting death, the rs moves just off the min on the water temp guage. today i did about 14 miles and it didnt really move

it looks like a jammed open thermosat but why 700 quid!!!!??