haven't used the z for a couple of months and I have just taken for a drive... going up a hill I noticed the Boost guage did not go over 0 normal droving it used to be on o and then accellerate and it would go up to 4-5 etc then back off and would go Nog .. now only seens to operate in the low negative and only rises up to 0 under accelleration could this be the guage ? or something else I came home and plugged in laptop and there was a fuel temp sensor fault registered with 1 start listed .cleared the fault / restarted and . seemed OK so took for another drive and still the guage not going above 0 .. no faults now but ... it does seem to be accellerating like it has an air leak (saftey boost) anyone got any ideas. much appreciated. I have a datascan log .. in case there is a tuning guru on deck ? TY
I think you're not driving it hard enough, see if WOT will register boost. Otherwise, if you're feeling a lack of power do a boost leak test..
Should have been enoiugh stick. The acceletarion was enough to take it up into Positive going up a hill .. at 4.5-5k A boost leak should show in nissan datascan as a safety boost code shouldn't it? or would this be faulty det sensor type error only being registered? .. I can do a boost leak test tomorrow if its needed? TY Martini Any other input??
More on the leak Connected up a leak tester and under pressure the leak seems to be coming from two places at the very 'Back' of the engine... I have never seen this before ... only ever from the front hardpipes . does anyone have any idea where the problem lies .. Its hard to get on the pump and hear where the leak is as the pressure is released too quickly to zone in on the Hisss. Any advice as to the hoses that are the most likely culprit would be appreciated.? Thanks .
Can it possibly be coming from inside the plennum... its definitely leaking in more than one spot.. seems to be at the back or in the v of the plennum. Rollin did a full under plennum refit for me a year or so ago so the hoses shold be fine in there ... I would have only done 1000km max since then .. Anyone got the clues on where to start.
Start by checking your idle control hoses, as well as brake and clutch booster lines. Holding a vacuum hose to your ear can work well as a stethoscope when troubleshooting these things. Ideally best thing would be to do a boost leak test (great article in the tech section)
Went to tech section .. Using a boost tester put about 5 lbs and slowly found all the leaks .. tightened the clamps to do so.. took it for a run and back to square one.. not going above 0 on the guage. Returned reconnected the Boost leak tester and no leaks. Connected the laptop and no error codes took for another run round the block and still not going above 0 and the car is running fine - if fine was an NA with a clogged air filter (as it says would be the case if it was exposed to excess air - in the tech section for boost leaks). what else to look for .. on this wonderful weekend? TY All
Ignoring the gauge for a minute, can you actually feel the car making boost does the power feel normal? Is it simply a faulty guage?
No its my guess the guage is fine as its running like a bl***y diesel .. not getting any turbo action at all ATM. a very blunt weapon. I have cleared the boost leaks. I have no errors on datascan. I intend to get a log of the car running shortly (waiting for the laptop to powerup battery.) was getting a bit of a leak through the dipstick when I put the boost teater under pressure but the PCVs were done by rollin with the Pluennum rejuvenation a year ago and there is no pressure coming from the dipstick when the car is running. The pod filter looks dirty so I'll clean that now. then I'll run it again and get a log of the components on a drive ... Thanks for any other things that any one can offer for me to check in the meantime TY
Do you have any sort of adjustable boost controller. If so bypass and see if you can get the default 7psi from the factory setup. If no joy you need to ensure your turbos are not seized. Take off the inlet side pipe and very carefully see if you can turn the turbine wheel.
This is wierd, No errors on datascan, no more boost leaks No Smoke, No missing, Drives like normal but just not jumping. guage still reflecting performance with zero and below only(-7) on the boost guage. I may try to check the turbos tomorrow as it has been sitting for a few months now and only been started and a run to the post office every week or so Could they sieze up from not being used?? I can't put my finger on the fault TY any contributors
Are you noticing any extra heat? Blocked or collapsed cat perhaps? Certainly is a strange one! Despite not making boost it could be electrical, try cleaning and retension your CAS, TPS connections with a mini file.. Turbos shouldn't seize up from not being used, I think the problem lies elsewhere.
Thanks Martin.. Oh No ..ot another $2.85 part and 6 days labour to find ... lol Had a few of those ... If it was a failure of sensor or component it would usually be picked up by datascan in one form or another .. It is also very strange that the guage only shows boost going from Neg to 0 cruises at a neg 3-4 and then backing off goes to extreme Neg -7 on the guage then under power up a hill it only gets to Zero... no further .. But the car is definetely struggling .. running smooth but seems to be starved of air .. Datascan says lean at adle then rich when throttle is applied. may go and take off the pod filter and see if that makes any diff.
FUEL TEMP SENSOR When I first started the car and found a problem, I then connected datascan and it had logged the Fuel Temp Sensor as an error message. I believe if this was not working or faulty it would think that the car was too cold or hot (as I have read in the tech section) and therefore would treat the problem by using saftey boost. Is there a way of testing if this is faulty and not registering in datascan any more .. dead connection or the like? Opinions ? Thanks
first safety boost does not kill all boost. 2nd I always thought the rich/lean readout was what the ECM was telling the system to do ie rich = make the mixture richer.
Fuel temp sensor error is no biggie. All it means is that the ecu assumes that fuel temp is at its maximum (80 degrees i think?) and flows slightly more based on that temperature. I have that error also, think from when I upgraded my pump - no issues
Theres some bad news right there.. But why no smoke and oil and crap everywhere.. What sort of cost to get that done .. Steve
