Hi I got my Hks boost gauge plumbed in yesterday after having to use the boost hose elswhere for a week or so. now this is the reading at full boost (see picture), I dont have any fault codes i have checked regurlaly with nissan datascan1.4, dont think ive got detting (how do i tell whats sounds like & when will it be most apparent?). I have searched the forum I found a little info but cant seem to find find the answer.

 

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detting sounds horrible, and occurs as you hit a certain level of boost.. varies car to car but zed should be ok up to about 14 psi (ready to stand corrected)

 

Are you sure there are no kinks or blocks in any of the lines feeding the boost gauge (or its sender if its electronic..) as these would give a duff reading.

 

Think might be worth doing an ecu reset (battery off for a while) to see if its stuck in safety boost.. sure someone else will have more idea than me though mate..

 

 

EDIT also just noticed the scale on the gauge it reading in bar? 1 bar is something like 14psi so unless you have rasied the boost the reading doesnt look too far off stock 9psi to me anyways..

err thats the correct stock boost level - 9psi is about 0.7 bar (assuming the reading is in bar) :hyper: unless youve got jets or a controller in which case something may be wrong but it shouldnt be too big a problem (your tubbies are working)

0.7 bar = 10.15psi

0.7 bar = 10.15psi

 

well, close enough m'darlin :D

 

question is what boost is Snoopy supposed to be running? nothing in rides section

So what's the problem exactly? LOL

So what's the problem exactly? LOL

 

Well for starters i have a rough idle which causes the car to stall alot but hopefully i am getting the part i need to solve the problem tommorrow. see thread click here

 

Only started this week opposite of the above!!(weird), i think it's the boost solonoid (at drivers bulkhead area under bonnet), it's the only solonoid left after removing the AIV'S & PRVR, it has started clicking erratically when i let her cool down at idle after a drive, when it clicks, the revs are all over the place but hold in the 1500-1700rpm area for 5-10 seconds, when i hear the clicking...happens 50% of the time.....see picture of it below, sorry about the mobile pictures camera is out af batts.

 

Recently i can feel a thrusting when im at a steady speed, like its trying to accelerate but im not moving the pedal...happens eveytime i get in the car now.

 

Reason i thought it may have been in safety boost is it doesnt feel like it has as much boost as it used too, but this may just because iv'e gotton used to it, i dont know, Im not hearing any sort of bad noise from the engine area so im assuming it's not detting but i dont know what it sounds like. sorry if this doesn't make proper sense but my brain hurts now :headvswal form thinking zed all of the time trying to solve these niggles.......I really appreciate all the help & advice id never be able to get my head round it without you guys :bow: :bow:

0.7 bar = 10.15psi

 

Is 10.5 psi standard boost? My Z looks completely standard apart from stainless braided fuel lines to filter, I found a razo turbo timer behind the dash panel which lights up but doesnt work!

detting sounds horrible, and occurs as you hit a certain level of boost.. varies car to car but zed should be ok up to about 14 psi (ready to stand corrected)

 

Are you sure there are no kinks or blocks in any of the lines feeding the boost gauge (or its sender if its electronic..) as these would give a duff reading.

 

Think might be worth doing an ecu reset (battery off for a while) to see if its stuck in safety boost.. sure someone else will have more idea than me though mate..

 

 

EDIT also just noticed the scale on the gauge it reading in bar? 1 bar is something like 14psi so unless you have rasied the boost the reading doesnt look too far off stock 9psi to me anyways..

 

There are no kinks or blocks I have checked most of the vacume pipes.

 

The hks boost sensor is electronic i think it's ok because the factory boost gauge shows 6.5 on full boost and the HKS shows 0.7 bar = 10.15 psi or there abouts.

 

Every time i do an ecu reset it just seems to get worse, may sound stupid but it's true.

SNOOPY.

 

Egr valve control solenoid

The surging could be caused by faulty or problematic 02 sensors, resetting ths ecu also resets the self learn of the O2 sensors so yes could make it worse till the ecu relearns, however if you have a faulty 02 sensor it will just compound the self learn and reset problem everytime.

 

Thing you should widen the search for general tuning, throttle balance, tps setting , ignition settings and of course the 02 sensors.

 

 

Jeff TT

SNOOPY.

 

Egr valve control solenoid

The surging could be caused by faulty or problematic 02 sensors, resetting ths ecu also resets the self learn of the O2 sensors so yes could make it worse till the ecu relearns, however if you have a faulty 02 sensor it will just compound the self learn and reset problem everytime.

 

Thing you should widen the search for general tuning, throttle balance, tps setting , ignition settings and of course the 02 sensors.

 

 

Jeff TT

 

 

Hi Jeff TT, you mention throttle balance, I also have a slight problem with that too i think, sometimes well quiet a lot actually my throttle pedal jams & I have to really punch it to unjam it, I traced the problem to the throttle linkage/throttle bodies somewhere, upon inspection of the throttle bodies it looked like there was a wear groove on the near side TB, from where it,s been closing, (could it have been adjusted wrong previously & would this cause the wear), Is this enough to jam the throttle? It's just it seems to be jammimg on the near side and i can't see any obstruction anywhere else.

 

I have set my TPS to 0.42 using datascan but i know it fluctuates +/- 0.02 occasionaly, is this ok?

 

I think the o2 sensors are ok but cant be sure.

 

I have a couple of datascan screen shots i will upload and post them now. cheers

First screen shot saturday morning not lond after cold start.

 

 

Second screen shot about 2 minutes later.

 

 

 

Third screen shot couple of minuteslater at running temp nearly i think but not driven anywhere yet.

 

 

can anyone make some sense of these readings, both my o2 sensor gauges change erratically low - high when driving hardish...is this right?

I am unfamiliar with the engine monitoring system as I use the Conzult system but it looks like one of your O2 sensors is Duff.

 

Jeff is right it is general servicing that is the first port of call.

 

That is a boost solenoid of sorts, it stores boost pressure in tanks in the inner wing to assist in clutch booster operation, this would also cause erratic idle.

 

Get one from a breaker on the forum, doubt if it would cost more than a tenner and easy to fit.

 

Lastly get your zed waxoyled if you live next to the sea :D

...

 

o2 sensors will act differently at idle. Hold the revs at 2k+ and they should both be freely moving up and down the scale.

Hi Jeff TT, you mention throttle balance, I also have a slight problem with that too i think, sometimes well quiet a lot actually my throttle pedal jams & I have to really punch it to unjam it, I traced the problem to the throttle linkage/throttle bodies somewhere, upon inspection of the throttle bodies it looked like there was a wear groove on the near side TB, from where it,s been closing, (could it have been adjusted wrong previously & would this cause the wear), Is this enough to jam the throttle? It's just it seems to be jammimg on the near side and i can't see any obstruction anywhere else.

 

I have set my TPS to 0.42 using datascan but i know it fluctuates +/- 0.02 occasionaly, is this ok?

 

I think the o2 sensors are ok but cant be sure.

 

I have a couple of datascan screen shots i will upload and post them now. cheers

 

Why dont you disconnect the o2 sensors and see if its running better, that would determine if one of the sensors is faulty. However, i'm not sure if this could lead to engine or other components being damaged.

o2 sensors will act differently at idle. Hold the revs at 2k+ and they should both be freely moving up and down the scale.

 

 

When i take my zed for a run with the datascan plugged in, at speed both o2 sensors move freely & almost in tandem with one lagging behind the other a little....