Shocking Fuel Economy. What Sensors To Replace

[pipster11]

if the o2 sensor does nothing or its still bad afterwards check:

coolant temp sensor - the 2wire one, can be replaced with any of the same colour

cam timing - my 32 was a tooth out, didn't realise and wondered my the rb20 was such a pos, the ppl i sold it to worked it out and it goes wicked sick now

also, i think i got about 700 out of a tank once with my turbo brick, but my tank holds about 65 litres

just change the motor for an rb25neo

[reeceo21]

Hey the afm has been cleaned and im all very jealous of your fuel economy, i had a chat to the old skyline owner and he said his fuel was about 350k to a tank and it went down to about 200k once and it turned out to be the afm. He suggested replacing it with a new one and do the O2 sensor. The coolant temp sender does work but seems to read a little low so i will change it. what ones work ? the reason my mechanic is finding it so hard to diagnose is it runs well and goes hard. He says most fuel economy issues are with cars that run crap. Im going to get a mates r32 on the scan tool as well and do a compare on everything. Ill also get the injectors tested soon maybe thats why the idle hints slightly because its getting an irregular spray of fuel

[Bsa]

Has the ecu been remaped on my old 32 I had the same problem and I just needed a tune and I cleaned the injectors then I got 470 km out of a tank

[boiracer]

you say the temp reads a little low, now issues with the clutch fan? my little bro's 32 had a stuck clutch on his, and it made his economy bad. but having said that his car was slow and loud and cold because of it.

[reeceo21]

hey guys as far as i can tell the ecu is stock. my clutch fan is in working order and from the sounds of it injectors will appreciate a proper clean ill keep you posted. Thankyou everyone who has contributed to this topic. I have just scored a job and it seems like its going well. Oh and got a 8 week payout for un fair dismissal The first things i will do with my first pay check will be an O2 sensor and MAF these are the one im looking at. probably like most im looking to spend the least amount of many but still get semi decent stuff ( I know thats near impossible ) This is the o2 sensor can anyone confirm if it fine for rb20det as it says rb25 but apparently they are the same

http://www.ebay.com.au/itm/NEW-Nissan-R33-Skyline-NX-N14-N15-Pulsar-Oxygen-Sensor-/150616354975?pt=AU_Car_Parts_Accessories&hash=item23116f309f#ht_2856wt_1270

And the MAF ( cheaper through the US because the aussie dollar is so strong)

http://www.ebay.com.au/itm/NEW-MASS-AIR-FLOW-SENSOR-MAF-89-95-SKYLINE-R32-R33-JDM-/400203344207?pt=Motors_Car_Truck_Parts_Accessories&hash=item5d2dfa694f#ht_2925wt_1270

what do you guys reckon ?

[Moodles2]

I wouldn't touch that AFM, looks too cheap to be true, and who the hell is "AIP Electronics". There's no gaurantee has the exact same calibration as a genuine JECS made AFM.. I would only go with genuine AFMs made by JECS

[pipster11]

i'd try re-soldering your current afm before you try that one

maybe unplug your o2 sensor for a tank and see if you get better consumption

and deffinately get onto that cool running (check thermostat too? you can run an r33 one but its 82dec not 87 like r34's run)

[89CAL]

R33 thermostats are 76°

[pipster11]

in the tridon book it says 82

but i got a nissan r33 one with my timing belt on it and it said 76.5 i think

both run at about the same temp tho, so maybe they rate it differently (opening vs fully open?)

[reeceo21]

well guys i bought a ntk o2 sensor and a brand new AFM. ill keep you posted