Million Dollar question...
 

Not sure if I should Post this here but... Need some serious help..

Ok I went to Z1 to get my car dyno tuned.. Mods are Test pipes, F.I. exhaust, Stillen G3 intake. John at Z1 tuned my car on the dyno after about an hour and a half John came back in from the dyno and stated "we have a problem":confused: he then stated my first pull showed my car made 280 WHP and John could only get me to 304WHP

He stated they Dyno "Osiris" software is showing that I have a knock on one of my knock sensors..

One bank is reading "0" knock the other is reading a knock of 22,800 or so..

John could not tell me witch sensor is showing the knock because my car is not throwing a code.. John stated my car is not knocking, and my motor is fine. According to John he has never seen this before. After a few more hours John looked at the knock sensors and stated they were perfectly fine..

John then went back and forth with UpRev trying different tunes and could not get rid of the problem. They even shut off the knock sensors and it still showed up, John the reflashed back to stock tune and it was still a problem.

Does anyone have any Ideas????????

Don't sweat the number's,,,hot weather & no boost=low output.
had mine done in mid May (after driving 3hours) & 1st pull was 290whp & ended up with 309whp.....thought it would have been more/but that was a 1.41:1 trans. gear pull instead of a true 1:1
as far as your knock sensor-i'll do some homework on it,,,BS gas we buy these day's doesn't help much either.

I'm surprised they don't have a good scan tool;
You may want to see if you accidentally unplugged one...they are proud of those baby's.
My cost @Napa is $230.51 eachhttp://uploads.tapatalk-cdn.com/2016...9e8db6c366.jpg


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Since when is 304whp considered bad for these cars with upgrades? That's higher than I got with Stillen G3 and HKS Hi-Power, but not sure what type of dyno I was on (may have been a heartbreaker Mustang dyno or similar).

What i ment was; lower than it would read at a more optimal weather condition...that's all & they have a Dyno-jet

Yes they are...

John stated I should be around 290whp on the first pull, and I should be around 320ish after the tune.. He also said I will be there if we can figure out this knock issue..

I did have good gas I believe.. I filled it up with 93 octane that contained no ethanol.

which part of this tread is million dollars?

The quest for the answer to my problems...

Dammit man... John told me my motor is not knocking at all. And that EcuTek would not be able to fix this problem...

Should I try to go to Forged??

Whoever you know that has a labscope & knows how to use it.... I don't think the tune part has anything to do with it/ you stated that one or the other knock sensors are inop. I haven't removed them on a 370 before; but you can start with an ohm test.
But with a good Labscope- you can see what sensor is doing what & at least get closer to the problem,,,,I don't like the blowing of an engine knock idea::::that doesn't sound like fun

Exactly.... Who or where can I find one of these 'Labscopes"?

Did you perform the mod's on your ~Z~ & how long was it driven with the Stillen Gen3 intake before tune?

I got access to one at work/but that's not doing you anygood,,,,,researching a bit-seems that one sensor could be picking up a noise & logging it (actual #of times it picked up that signal) and i've also read where moving the mafs can cause unusual noises that the knock sensor picks up.
Jon said he could not determine which bank was reading the 22,800+ times it picked up a signal,,,,not sure why the cel light hasn't came on.
could have a vacuum or exhaust leak......i've been talking to a few of my co-worker's about this & they ask me which bank is doing it.
Also have read that a clutch engagement noise & sudden acceleration of the free flow exhaust can trigger it.....these are on generic cars & not a 370 in particular.
heck-i just remembered an instructor's name/gonna give him a shout.

I don't know exactly how long I have driven with out a tune but a long time lol, Also Tomorrow I taking my car to a buddy of mine who is the Nissan Master mechanic here in town. He told me to bring it to his house tomorrow night. He's going to bring his tools home and find out exactly what the deal is.. He also told me that It could possible be a critter got in there and started chewing on some wires... And as far as a cell code goes he told me the car will NOT throw a code for a knock sensor.. he told me Nissan has it set up to pop a code but no light will come on, and that the knock sensor only reads at high RPMs... So stay tuned and ill update sometime tomorrow night...

Tenfo,sounds good Wonka


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I'm not getting why they would say MAF placement or exhaust would effect the knock sensor. Knock sensor are simply piezoelectric and generate a voltage from vibration (a knock won't have a smooth running condition). As for the lab scope you can pick up snap on vantage on eBay for dirt cheap now and they work great and are bullet proof, however I don't know if it will help you much because if I remember correctly there will always be some activity on the knock sensor it is up to the PCM programming to determine what is the knock threshold. You would be better with a scan tool and it should give you a knock sensor 1 and knock sensor 2 data.

So the guys name is John, right?

Wonka; this was the reply from an instructor/Trainer of diagnostic's on vehicles.http://uploads.tapatalk-cdn.com/2016...56c5accf25.png


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Huh? I went and took it to the mechanic buddy of mine yesterday, He ran the Nissan computer and looked for any codes and could not find one, then then took a scope and looked at the harness and knock sensors, according to him everything looked just fine. He's going to order me a new knock sensor and remove both sensors that are on the car if run some type of conduction test on them to see if one of them are bad. he also checked for my power steering pump to see if it could have had something to do with the noise the sensors are picking up. He also checked my injectors and found nothing.. Also checked the car to see if it was indeed knocking and sure enough it was not... Sooo my quest continues...

Sounds like a broken wire in the wiring harness. The insulation will be fine with no visible damage. I have fixed several on Nissan products. Tech will need the Nissan Consult, start jiggling the wiring harness while watching the Consult.

I would check the sensor visually first, They are under the intake manifold so you have to pull it off. I was having HUGE KR issues with mine while I was tuning with Seb, we just figured it out that is was noise, not true KR. ECUTEK can adjust the KR sensor if its picking up noise. I would contact him for sure :).

They took a scope and looked at the sensors, everything looked fine, and John contacted uprev and they stated that the tune has nothing to do with the knock sensors.

That's because is UPREV, they can not control the KR sensitivity. ECUTEK can tho, I guess to late to switch :/.

No, John @z1 told me I could come back and he would swap me over to ECUTEK but once I made that switch, I would be stuck with it... And its not a guarantee that would fix it...

A buddy of mine at work has a Gran Prix and his gauge is showing a knock on a particular cylinder consistently. When the computer senses this knock, it retards the timing and the car runs rough. It turned out to be a loose motor mount, and his header was hitting something causing the knock sensor to "believe" that this cylinder was misfiring.

The sensor cannot determine if the noise is from an actual "knock" or an external noise so there may not be anything wrong with the sensor. May not be the problem here, but something to consider...

I'd make the switch if he's not charging for it. If he can't resolve the KR issue" Listening with head phones while tuning" and see it's not real KR and adjust the sensor , I contact Seb. Just IMO tho :)

Very true. Had a customer Acura MDX one time that would start and stall/stumble repeatedly. Front mount so worn that the whole engine would rock and then slam down and the vibration would set the knock off and retard timing just as the engine is starting.

UPDATE:

Ok I spoke with John @Z1 and he has been in contact with UP-REV and they believe its the ECU... John told me he would be in contact with me on Monday about doing an ECU swap to see if this is the issue.. Stay Tuned for more updates....