A&Q about 350Z
Q:
hi all!
please can anyone advise on the following fault codes
engine:
523 - intake air temp sensor (G42) (open or Short to B+)
522 - engine coolant temp sender (G62) (open or short to b+)
519 - manfold absolute pressure sensor (G71) - no signal
abs:
793 - brake pedal position sensore -G100
1276 - ABS hydraulic pump -v64 - signal outside specifications
thanks
A:
does it run? lol
on 519... there is a vac hose just after the throttle body (on the bulkhead side of the manifold) that disappears off to the ecu (under the windscreen).
that vac tells the ecu something (manifold pressure basically). fix the vac hose and you should be done.
intake temp sensor.... that is just after the airbox, its the elec prob that plugs into the hose, that most people think is a MAF sensor, but really tells the ecu the temp.
check the 2 pin plug for 5v... if no volts, the wiring is dead.
coolant temp sensor is another 2 pin jobbie that plugs into a sensor thats on the gearbox side of the head. again, the 2 pin plug should have 5v across them from the ecu. the sensor varies in resistance according to the engine temp.
when cold, the resistance is low and the engine is rich. without resistance on there it will run silly rich.
i am such a geek i even have a chart for the resistances.
have fun.
A:
now tell me how you got those fault codes.... as i wanna read mine
A:
thanks matt,
yes the engine runs suberbly which is what is weird.
i have the vw tool with the cable. mine is a 1994 OBD1. if ur also OBD1, im in london, pm me.
A:
what do u mean by rich?
A:
what do u mean by rich?
Fuel mixture. It will be squirting in to much fuel.
A:
fuel and air have to be in a specific ratio when burnt. rich means there is too much fuel. i expect that if you took the spark plugs out they will be sooty (ie too much fuel, not all of it burning)
im amazed that it runs well if spitting out those faults. if i disconnect either the coolant sensor or map sensor it stutters and then stalls after about 10 secs.
what mpg you getting?
i think mine is the later obd2, 16 pins. where did you get yours?
A:
make sure if you did it.. it isnt ready the error codes from memory and is a fresh scan.
A:
i think the codes stay for about 50 starts or something. when i got my car to stealth last summer, it had 3 really simlar codes on there.
none when it left tho ;)
A:
i have had the fault cleared and they keep reappearing.
im lucky to get 250miles per tank, i thought that was normal given the engine size!!
A:
when i got mine it was ill, about 240 per tank. i get over 300 miles a tank now and i thrash it a lot. yours is ill and i suspect that its running rich. worth taking the plugs out to look.
did you check the list of things i gave up there?
A:
cheers matt,
im gonna spend some time on it this weekend, the plugs are pretty black!!!! so i guess thats proof that it is running rich.
if i do get the 5V accross the sensor wiring, i take it i need to change the sensors.
if i do not the the 5V, what should i do.
sory for acting a bit thick, but i hate wiring and anything electrical!!
240miles is roughly what i get now!!
A:
i had fun with mine, it had melted part of the loom lol the throttle has a 3 pin plug next to it (throttle potentiometer). check that part of the loom incase it has melted. its right above the exhaust.
if youre getting your 5v, then just clean up the terminal and check with a multimeter to see if the resistance of the sensor is within range.
youll be laughing once you end up getting 300miles a tank
A:
cheers matt,
im gonna spend some time on it this weekend, the plugs are pretty black!!!! so i guess thats proof that it is running rich.
if i do get the 5V accross the sensor wiring, i take it i need to change the sensors.
if i do not the the 5V, what should i do.
sory for acting a bit thick, but i hate wiring and anything electrical!!
240miles is roughly what i get now!!
as for not getting 5v.... follow the wiring back to see where it may be broken.
the worst case is if you cant find the break, but even then all you do is see what pin it should be going back to on the ecu and re run the wire. fiddly, but will improve the car no end, cheap to fix, will make it more fuel efficent and faster.
everything to gain
A:
hm i got 280miles today out of 30quid *london and around local.* i get bout 100miles to 10quid.
A:
40mpg lol why do an abf conversion if you drive like a nun?
the last tank did 310 miles on 43 litres.
what are your ones actual figures?
A:
ok im getting 5v on the coolant sensor loom, and the coolant sensor has the right restistance. checked with cold and hot water. so why would this be reported?
got a net air temp sensor.
the vacuum hose that goes to the ecu - well thought id be clever and just unplugged. engine started, struggled then stalled. so hose must be ok. put everything back together and guess what. the engine doesnt start!!!!!!!!!!
tested and checked everything. removed sparks and 1 + 2 are drenched, i mean drenched in oil!!! whats all that about. cleaned them up, put them on the stove and then the car started.
looking at previous posts, looks the the abf rocket cover gasket can leak oil into the plug holes - all advice welcome!!!!
A:
Hello, still struggling with the car I see! - the inside part of the rocker gasket on the 16vs are prone to failing and the result is oil running down to the plugs.
A:
if soaked in oil then the spark will be effected big time.
may be a rocker cover problem (which im changing soon).
if your sensors are ok then why do the faults keep coming back??!
A:
right guys,
changed the psarked, everythings seems ok now - no more oil, no blue\white smoke to be seen, no black spark plugs!!!
my VW-TOOL is now reporting no faults, has got a coolant temp and air temp reading now!!!
with the rocker cover gasket - shud i change immediately? if so, can a oil dipstick like me manage!!!
A:
40mpg lol why do an abf conversion if you drive like a nun?
the last tank did 310 miles on 43 litres.
what are your ones actual figures?
it was mixed nice driving and not...
A:
right guys,
changed the psarked, everythings seems ok now - no more oil, no blue\white smoke to be seen, no black spark plugs!!!
my VW-TOOL is now reporting no faults, has got a coolant temp and air temp reading now!!!
with the rocker cover gasket - shud i change immediately? if so, can a oil dipstick like me manage!!!
im hoping to do the rocker cover on mine in a few weeks.
basically the intake manifold has to come off, which involved a handful of relatively easily accessible allen bolts to sepratate the top part (visible part) from the lower half.
the top half has to be then unbolted from the supports which are above the exhaust man. by the bulkhead.... that appears to be the harder bit.
once the intake man. is off... the rocker cover has about 6 allen bolts... which should then be easy.
i recon its a 5 out of ten for hardness.
shouldnt be too bad
glad you got rid of the faults. im going to get one of those fault readers!!