Ok, got a very strange issue, the other day i gave it a little bit of beans, after coming off the gas, i had a pop out the rear of the exhaust and the car ran like it had just 5 cylinders, i gave it a quick rev and it was back to normal and driving lovely and was all the way up till parking it up last night.

 

This morning id decided to get the laptop out and check error codes to see if there was anything on there, started the engine and the idle is lumpy as hell, i have no smoke coming out of the exhausts, the engine temp is fine, but there is a noticeable shake to the car now, took it for a quick spin to see if it would sort its self, but had to come home as it was hesitating, didn't seem like it wanted to go and on idle again running rather rough.

 

Things i have checked.

 

ECU connection where the traction control is installed in case of wire issues, but everything is fine.

Checked all connections in the Engine bay including, coil packs, VTC connections, injectors, CAS, temp sensors, PTU (series 2 by the way) and all fuses in the engine bay.

Ive checked all vac lines, all intake couplings, the MAF connections to the intake system, and the intercooler pipes

 

im at a loss as to what it could be.

cylinder test results

 

 

Looks like something is effecting cylinders 2, 4 and 6 or im getting it the wrong way round and its 1 3 and 5 that are being effected

If you don't know mate - I'm fooked if I do.....:oops:

 

I have your voice message BTW; I was on hols when you called and the phone was left in my glove compartment.... But I do have your new number now thanks matey; speak soon:cool:

 

Richard:clover:

If you don't know mate - I'm fooked if I do.....:oops:

 

I have your voice message BTW; I was on hols when you called and the phone was left in my glove compartment.... But I do have your new number now thanks matey; speak soon:cool:

 

Richard:clover:

 

Struggling to figure it out, unless this is a symptom of water ingress, its been raining the last couple of days and i do have a leaky targa, the drain tubes i sorted last year, but other than that, im lost on this one. just odd how it came on so suddenly over night.

Sounds like the very common problem of injector connection that has become injector high resistance, almost all injector failures are sudden and can be after a long shutdown or even overnight, check first the lowest cylinder (6) the injector should read around 14 ohms any higher than 20 ohms and it will cause issues ( ecu output is effected) and open circuit means its toast, if so get your dremel out and swap it over with a good known one.

 

 

Jeff TT

Sounds like the very common problem of injector connection that has become injector high resistance, almost all injector failures are sudden and can be after a long shutdown or even overnight, check first the lowest cylinder (6) the injector should read around 14 ohms any higher than 20 ohms and it will cause issues ( ecu output is effected) and open circuit means its toast, if so get your dremel out and swap it over with a good known one.

 

 

Jeff TT

 

The down side is, its a Nismo 555 injector if its gone, just been out to the car got it idling better, but now wont rev past 2500, so maf knackered?

 

EDIT

Edited March 28, 201411 yr by vodkashots

You say it has been raining a lot.

It could be wet filter/filters or maybe a wet MAF itself.

You say it has been raining a lot.

It could be wet filter/filters or maybe a wet MAF itself.

 

Checked that, its surprisingly dry, unless the MAF has actually failed, but that doesnt account for what felt like a dropped cylinder surely? although ive had to down tools now, one because of light, 2 because there is a old peoples home opposite and i doubt they will appreciate me trying to rev my car passed 2500 to test it, i reseated the connection on the ECU and had a fiddle with a few of the wires that run to the traction control, that seems to have sorted the rough idle out, but now i have the MAF issue.

Edited March 28, 201411 yr by vodkashots

Got to love these old girls!

They treat us mean to keep us keen! (But wouldn't it be nicer if they weren't so much trouble!?)

Got to love these old girls!

They treat us mean to keep us keen! (But wouldn't it be nicer if they weren't so much trouble!?)

 

I'm hoping its one of those faults that just develops for the hell of it, then once you have had a good look over everything, it magically solves it self and you are left wonder what the hell happened lol

Checked that, its surprisingly dry, unless the MAF has actually failed, but that doesnt account for what felt like a dropped cylinder surely? although ive had to down tools now, one because of light, 2 because there is a old peoples home opposite and i doubt they will appreciate me trying to rev my car passed 2500 to test it, i reseated the connection on the ECU and had a fiddle with a few of the wires that run to the traction control, that seems to have sorted the rough idle out, but now i have the MAF issue.

 

The only reason I say that is that I once cleaned my filters out, and did not dry them very well. For a while she ran really rough, just as if she was down 1 or 2 cylinders.

I managed to limp home though.

Turned out to be that the damp filters had affected the MAF.

Dried everything off and replaced the filters and the fault disappeared.

I'm hoping its one of those faults that just develops for the hell of it, then once you have had a good look over everything, it magically solves it self and you are left wonder what the hell happened lol

I will all the little niggles with my Zed would hurry up and cure themselves :lol:

Failed MAF was the issue, JJP popped over and kindly lent me his MAF, car now works as intended, although there is a slight miss, but i had the ECU unplugged, so going to see if it clears up, if not, time to chase the slight miss, car doesn't hesitate now though, and it goes above 2500 revs

Mine did the same chased round dropping cylinders for about a week, it got progressively worse and yeah it was the maf.

Mine did the same chased round dropping cylinders for about a week, it got progressively worse and yeah it was the maf.

 

the symptoms are very random on a dying MAF i have to say lol

I think the winner is when you do the disconnection test, but yeah it has some weird symptoms.

Ok so got leaky vtc solinoids and still have hesitation issues

I shouldn't worry I've always got hesitations issues when I first get up as well.

 

Maybe it's time for service Ian. Replace the vvt solenoids etc.

I shouldn't worry I've always got hesitations issues when I first get up as well.

 

Maybe it's time for service Ian. Replace the vvt solenoids etc.

 

Yes a service is on the list, they are working, but looks like they are leaking oil, could be the black plastic stuff on the back, but still replacements sound good right about now.

 

This issue is getting stranger by the day i think, sorted out the MAF, car now drives, still have hesitation issues, idle is lumpy again now, did a error check on the ECU, had code 31, code 34 code 51 (ECM fault, knock sensor, injector circuit) then a load of codes in the 1000's that didn't make any sense with no description, the moment i cleared the codes, it gave me a fresh batch of them, around 8 in total all different, thinking the engine loom had slipped or moved or something and was melting on the turbo i had a quick check, nothing there, took the ECU out undid the cover and checked the insides, all looks very nice and clean in there, no water, no burnt patches, nothing out of the ordinary, plugged the ECU back in, tried to connect to it, couldn't connect, when i eventually managed to talk to the ECU, again had the same thing with the fault codes, random high error codes likes 1023, 1101 mixed in with normal codes, codes 31, code 34 and code 51, as if things all over the engine were failing. could this actually be my ECU crapping out?

 

None of the codes generated illuminated the check engine light.

Edited March 30, 201411 yr by vodkashots

Bump on the ECU issue above?

What you using to access codes?

ODB scan tech nissan

ODB scan tech nissan

 

Ok that explains why the weird codes, Nissan ScanTech is OBDII Generic and primary for cars such as Maxima A32 and Nissan VQ engine range such as the 350z and late Gloria Ultima HY33 Generic codes on OBD ll are notoriously indetermined and often misleading despite the fact they should be super accurate, now add canbus technology it make it worse, plugged in to a non OBD ll car is odd out of interest what version you using? presume your also using Consult adaptor?

 

Jeff TT

Ok that explains why the weird codes, Nissan ScanTech is OBDII Generic and primary for cars such as Maxima A32 and Nissan VQ engine range such as the 350z and late Gloria Ultima HY33 Generic codes on OBD ll are notoriously indetermined and often misleading despite the fact they should be super accurate, now add canbus technology it make it worse, plugged in to a non OBD ll car is odd out of interest what version you using? presume your also using Consult adaptor?

 

Jeff TT

 

Yep using the Conzults adapter, cant get it to accept the code for the software though, i do have the trial software i can use, but doesn't give me much functionality, i have had a few mins to Ohm's test the injectors, all the injectors are between 12.7 and 14 resistance, but non out by more than 1 ohm, injector 6 is 12.8 Ohm (not much room to get the prongs on injector 5 lol), are there any cables / connections under the passenger seat that if wet will cause issues in the engine? the ECU area is dry as a bone, but the carpet behind the passenger seat is quite soggy from all the rain and the inlet of water ive been battling.

 

Im using version 1.51 of the ODB scantech software, id do have a genuine Consults with code letter and everything, looks very old and came with my old blue zed.

Edited March 31, 201411 yr by vodkashots

my odd idle, its regular but intermittent if that makes sense (well watch the video really), you should be able to view that as ive left it open for public viewing.

 

https://www.facebook.com/photo.php?v=10154053101160602&l=3710969249876805881

Edited March 31, 201411 yr by vodkashots

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