Something Wrong With Car?

[Chi100188]

Hey guys i got some problem with my car its drinking heaps of fuel i normally get around 350-450ish a tank depends on driving style but ever since the cold has came my car drinks a lot of fuel e.g i only get around 200k's a tank and my car hesitates to come on boost sometimes? like feels like somethings holding it back and also it misses around 5k ish only sometimes? i havne't done any modifications to the car

Mods:

PFC

PFC BCK

Turboback zorst

FMIC

Z32 AFM

Nismo 740cc injectors

walbro fuel pump

i havne't done any other mods since it was tuned wiht those mods....

Cheers

Chi

[geraus]

Hey how are you. Have you checked your spark plugs? Also what type of spark plugs are you using? How much PSI?

[Chi100188]

hmmm havne't checked my plugs yet their NGK coppers with a 7 heat rating gapped to 0.8 im running 1.2 bar with a HKS 2535

Cheers

Chi

[ash_29]

Have u changed ure coilpacks???

[Chi100188]

nah i havne't they been fine ever since i bought the car lol it doesn't miss on idle hmmm if its the coil pack it would miss on idle right?

[mad082]

how long does it take for the car to come up to temp? it may be that your thermostat is on it's way out (or already gone) and causing it to run colder start enrichment for longer, or all the time. this will cause poor fuel economy, and the extra fuel can foul up the spark plugs.

also what do you class as a tank? how many litres? saying "a tank" is a useless measure as different gauges will read differently so you might be calling 30L a tank or 50L a tank. put your economy into L/100kms

[mad082]

no it won't miss on idle if the coil packs are worn out. it will only do it once there is more load on them. that is why it only happens up high

[GT-RZ]

It can miss on idle if the coilpacks are worn out... Higher RPM will often see coilpacks missfire in cars that idle normally simply because they are working allot harder as the RPM increases.

I'v had a coilpack gradually get worse and worse untill it was a WRX from the first turn of the key.

[Chi100188]

hmmm ever since i changed the radiator cap to an ARC one i've got a Koyo Radiator the max temperature it goes upto is 60-65 degrees.....normally warms up to 75-80 degrees with the stock radiator cap.....full tank is 50L or so

Cheers

Chi

[blind_elk]

Does the PFC indicate engine temperature? What temp does it say the engine is running at when "warmed up"?

[mad082]

that is very weird that the cap is altering the temp. never heard of that before. i know it can alter the boiling point, but never heard of it altering the running temp.

but i would still look at the thermostat. no matter what the radiator, etc, your temp will ultimately be set by the thermostat as that stops any coolant leaving the block until it's opening temp. so i would guess that it isn't sealing properly. that causes lower temps and longer warm up time, and higher fuel consumption