Driving my zed to see the mrs at work and the following happend..

 

car was warned up with less than 1/4 tank of gas, no warnings and i went to over take a car, used Wide open throttle, from about 40mph, revs climbed to 4-5k then huge hesitation, revs dropped my foot was still on gas as i took in what happend, this dip n loss of power then climb cycle happend 2/3 time while i realised, took off WOT and then overtook.

 

There was no sound from the engine like knocking or pinking or anything, so hopeing its not det... I refuled the car, let it warm up and tried it once more, same thing happend... also tried it with my profec B turned off exaclty the same.. The profec isnt set for high boost really, the max ive ever had is 12psi, only once and that worked fine, with the profec off the car reached a spike of 10.5 psi then started to drop..

 

The zed is mattys old black zed is anyone knows the car, but basically spec wise has apexi, scorpion exhaust, JWT Cip (although i havent checked this was just told it by previous owner...probably should check at some point...) and the profec. Its an auto uk TT been serviced recently at zed world and they didnt hint at anything...

 

Also noticed during the winter if i braked hard while the car was still warming up sometimes it would stall (PCV valves thing i think..) but its fine now the weathers heated up...

 

Advice guys...

anyone?

anyone?

 

Any smell of petrol as my cars overfueling and its causing loss of power? Worst case for me its lambda sensors which are £400 fitted, could just be a temp sensor tho. I'll find out soon as she's off to Nissan.

Any smell of petrol as my cars overfueling and its causing loss of power? Worst case for me its lambda sensors which are £400 fitted, could just be a temp sensor tho. I'll find out soon as she's off to Nissan.

use one of the trader's off here mate £400 for lambda sensors sounds abit steep

use one of the trader's off here mate £400 for lambda sensors sounds abit steep

 

Cheers for the advice bud. It has been suggested to me and I'd def do it but I really need a courtesy car while the work gets done and apparently the Zen garage (nearest one to me) can't supply one. :confused:

Driving my zed to see the mrs at work and the following happend..

 

car was warned up with less than 1/4 tank of gas, no warnings and i went to over take a car, used Wide open throttle, from about 40mph, revs climbed to 4-5k then huge hesitation, revs dropped my foot was still on gas as i took in what happend, this dip n loss of power then climb cycle happend 2/3 time while i realised, took off WOT and then overtook.

 

There was no sound from the engine like knocking or pinking or anything, so hopeing its not det... I refuled the car, let it warm up and tried it once more, same thing happend... also tried it with my profec B turned off exaclty the same.. The profec isnt set for high boost really, the max ive ever had is 12psi, only once and that worked fine, with the profec off the car reached a spike of 10.5 psi then started to drop..

 

The zed is mattys old black zed is anyone knows the car, but basically spec wise has apexi, scorpion exhaust, JWT Cip (although i havent checked this was just told it by previous owner...probably should check at some point...) and the profec. Its an auto uk TT been serviced recently at zed world and they didnt hint at anything...

 

Also noticed during the winter if i braked hard while the car was still warming up sometimes it would stall (PCV valves thing i think..) but its fine now the weathers heated up...

 

Advice guys...

 

Hi Geeky,

 

What you describe is exactly when my car does when I'm running very low on fuel. According to the Nissan service manual, there's a flow sensor which cuts the power to the fuel pump if it stops picking up. Presumably, the remaining fuel is sitting at the rear of the tank under full acceleration, so there's nothing to suck up. Don't worry about it too much- although it's terribly embarrassing when a) showing off or b) over taking!

 

Hope this helps.

Simon.

anyone?

As it been raining where you are mate?

hi guys, the car does over fuel slightly, but nothing this bad, its not so much just a loss of power as the revs dont continue to smoothly rise which they should if im just running too rich, the surging is pretty violent really...

 

as for the fuel it did the same after the car was refueled with optimax to full so should be more than enough fuel and pressure from the fuel weight for the pump.

 

 

as for the wet mantra... it had happened once before when it had been raining but that was 3 months ago, nothing in between... no rain here today.. (well not unitl after the event...) but i had washed the car a couple of days ago... although we have had some hot weather in between so any water ingress should have dried out i guess..... what you thinking?

i get the exact same thing,had it happen 3 times in the last month,as willyed says it gives you a bit of a red face when overtaking and going up the 1/4 :wack:

 

Paul

mate what did you do to fix it / find the fault to be? as ive said it still happens even with a full fuel load.... i mean it was cold today but im pretty sure it wasnt det as there was no nasty noise other than the random rev drops / rise..

mate what did you do to fix it / find the fault to be? as ive said it still happens even with a full fuel load.... i mean it was cold today but im pretty sure it wasnt det as there was no nasty noise other than the random rev drops / rise..

 

sorry bud,i'm no further forward than you,whenever i ask someone to have a look it wont do it :headvswal ,mine also does it regardless of fuel level,it may have been recently raining or just been washed when it does it though and i dont have a splashguard under my induction kit?

 

hope you find the cure

 

Paul

hi guys, the car does over fuel slightly, but nothing this bad, its not so much just a loss of power as the revs dont continue to smoothly rise which they should if im just running too rich, the surging is pretty violent really...

 

as for the fuel it did the same after the car was refueled with optimax to full so should be more than enough fuel and pressure from the fuel weight for the pump.

 

 

as for the wet mantra... it had happened once before when it had been raining but that was 3 months ago, nothing in between... no rain here today.. (well not unitl after the event...) but i had washed the car a couple of days ago... although we have had some hot weather in between so any water ingress should have dried out i guess..... what you thinking?

Just thinking of a wet MAF mate, as the wifes done this to me and found the

Apexi full of bubbles!

Felt just like the engine was switched off!-ease off the gas and away it went again, could be worth a look?

sounds a plan, as i dont have any kind of splash guard on the apexi....

 

where do i start with checking the maf then mate? guessing i need to get the nose panel off (somehow...) and then the apexi and see if its all wet in there?

sounds a plan, as i dont have any kind of splash guard on the apexi....

 

where do i start with checking the maf then mate? guessing i need to get the nose panel off (somehow...) and then the apexi and see if its all wet in there?

Yup that's about it!-I since fitted a guard under the nose panel to stop it happening again!

its the apexi i have too,lol,thanks manta i think you saved 2 of us :bow:

 

Paul

too true, im guessing its really obvious if its wet then? and also daft question im sure but how do you get the nose panel off ?

 

what sort of arrangement did you go for in the splash guard?

 

 

as for drying the maf out, is it dead now its wet (assuming) or can i leave it to dry and then crack on as its all fine?

 

cheers for the help mate...

too true, im guessing its really obvious if its wet then? and also daft question im sure but how do you get the nose panel off ?

 

what sort of arrangement did you go for in the splash guard?

 

 

as for drying the maf out, is it dead now its wet (assuming) or can i leave it to dry and then crack on as its all fine?

 

cheers for the help mate...

Maf should be fine mate, just need to dry of the filter(if it's wet of course)

If your really unlucky it could have buggered it but I don't think so.

As for the panel, open bonnet and you can see 2 10mm bolts at the top of the panel, undo these and lift out the panel!

The Apexi is bolted on with 4x10mm bolts bud.

The guard was an offcut of plastic that Boldy had used for his and I just sat it under the nose to cover the join on the panel then picked up 2 spare bolt-holes that were there to secure it.

Cheers for the advice bud. It has been suggested to me and I'd def do it but I really need a courtesy car while the work gets done and apparently the Zen garage (nearest one to me) can't supply one. :confused:

 

We charge £75 a side to supply and fit each O2 sensor that would leave you 250 out of the 400 nissan quoted to use on a hire car, or if you wait an hour or two then you could probably have your car done while you wait :)

Just to let you guys know the MAF is probably fubared if it has got wet, even a dry one can give you this sort of behaviour as a symptom of it's failure :(

costs for new maf? and fitting it just a replacement as in bolt on?

Give us a ring bud?

sure, il see what i find tomorrow mate... thanks for the help

Just to let you guys know the MAF is probably fubared if it has got wet, even a dry one can give you this sort of behaviour as a symptom of it's failure :(

 

I get these symptoms as well and had pretty much decided it was a MAF problem, I have standard filters, a splash guard and even when it's completely dry I get the same loss of power - everytime. Is there anyway to prove the MAF to be at fault without swapping it out? will a conzult or datascan diagnostic show anything.

 

I've had the thing out before now, but it doesn't look like the sort of item that can be fixed, just replaced, is this correct.

 

Cheers,

 

Gary

be interested to know the same sort of answers to gaz questions

Just to let you guys know the MAF is probably fubared if it has got wet, even a dry one can give you this sort of behaviour as a symptom of it's failure :(

 

I had these exact symptoms (loss / recovery of power in a very violent maner) the weather was dry, so I think the wet apexi is a red herring. I changed the MAF, problem solved, everything runs as it should. I suggest you ask a fellow forum member at your next meet, :bow: if you can swap the MAF's over (10 min job) to see if it fixes your problem.

Good Luck

Pete.

cheers guys, got the apexi off and it doesnt appear wet, although if this turns out to be the maf then i do need some kind of guard i guess....

 

mantra wonder if you could grab a pic of your sort of arrangement for me?

 

also guys any ideas how i can test the maf without a replacement one?

 

got the apexi off and it doesnt feel wet to me and the general area looks dry too, so probably just a dead maf... would this show on an ecu diag or anything?