Guys,

Need your expertises to diagnose the problems for me...

My car jerks (feel like the power is being cut like the traction control kicks in) quite a lot at light throttle at around 1700rpm and 2100rpm while cruising... and if I re-enter the throttle (WOT) at any rpm in between 1000rpm and 2500rpm, the whole car jerks heavily (like bunny hob) for a second or 2 before the power delivery becomes smoother because I could still feel the engine jerks a bit at WOT in between that rpm range...

I always have these error codes from the scan... and always have these codes returned:

INT/V TIM CONT - B1
[P0011]

INT/V TIM CONT - B2
[P0021]

As soon as nissan clears that code and drive the car for around 100meters, they never got these error codes back.... but whenever I go in for a scan, those error codes would be there again after a few days of drive...

I had this type of problem before my engine rebuild as well, but it only happens at 1700rpm, not 2100rpm though....

Any input/thought is welcome please!!! Thanx in advance!

cheers,

richie

 

I have the same problem... Its a timing advance on the cams that the ECU sees. Seems like only some have this problem. I would also like to take the time to Diagnose this problem.

 

EM-EFER,

So you have this type of engine surge problem too? or you have the same error codes displayed all the time?

Nissan told me that it might due to the flywheel installed incorrectly (wrong position), but I seriously doubt so though since my nismo flywheel has only 1 way to get installed because we never remove the "key" off.... they told me that if the flywheel is installed incorrectly, the crank angle sensor reading will not match up with those cam angle sensor readings, then the ECU always reckons that the crank angle sensor reading is always correct, then register cam angle sensors fault...

May be a bad crank angle sensor? and how can the flywheel got installed incorrectly? don't get it though

cheers,

richie

 

Richie, I read somewhere on here awhile back where a lightweight flywheel was installed and the crack sensor was not installed correctly. I don't remember what the error codes were but if I remember right he did have similiar symptoms. The only thing is that his car had that problem as right after putting on the flywheel not later on.

 

redness,

thanks for that... but I cannot find that thread at all though... mmmm.... or possibly my crank sensor is due for the change soon?

cheers,

richie

 

Sorry, I couldn't find it either. It has been a long while back maybe a couple of years. I don't remember what the main subject of the thread.

 

no problem mate!

I spoke to my tuner and he told me that as soon as there is an engine surge at those rpms, he could see the cams going from the set timing down to 0, then come back up, then down again... seriously don't know what the problem is though! Still trying to figure that out

cheers,

richie

 

Hey bro. I got my higher compression setup done. Guess what? I to am having some complications.

The VDC and Skip lights stay on and the cars actually jerks a bit at low RPMs. The brakes are indeed grabbing a slight bit sometimes. A few times the brakes actually grabbed hard enough to lock the tires while driving extremely slow and turning at the same time, like when taking off in a parking lot.

I am no longer throwing any codes, but the VCD and Skip lights stay on anytime the car is in motion until I turn it off. When I start the car, they are off, but the second I start moving, they come on.

At first I was leaning towards the Crank Position Sensor, but now that I notice that it starts as soon as I begin moving, I think there may be a problem with one of the speed sensors in the wheels.

Any advice would be appreciated.

By the way, this NA setup is ROWDY!!

 

done12many, here is my advice. pull up your center console and take out the whole vdc sensor. i mean face it, it is there for people who dont know how to drive.

this will eliminate any problems that this would possibly cause


cant wait to see some before and after dynoes with your high compression setup...

 

richie

I think the OBD vtc error codes you are getting are because you are using Nismo VTC sprockets that allow an additional 10+ degrees of advance & the camshaft sensors would be seeing this and sending that info to your OE ECU.
I know you are using MoTeC to control your motor but MoTeC has no OBD info available to read.
Maybe theres some conflict in the wiring of the two ECU's together
You still use the OE ECU to run the DBW dont you ?

 

Peter,

That's exactly what my setup is.... running OE ECU to run the DBW and the rest of the engine managements are controlled by motec now... I would really want to find out why would the cams timing just go to "0" suddenly and back then "0" again, means no oil (or not enough oil) is sent throug the solenoids at all...

Pete, I have already sent my file to you and you could be able to take a look at the setup... if you have any question, give me an email or call! Thanx heaps mate!

EDIT:
Just found out that with the new motec software release, it includes the following update to the cam control...

CAM Control
Added Cam Control Actuator Normal Position and Duty Correction tables and channels. (Functions | Cam Control)

Added “Cam Control Ref Duty” and “Cam Control Duty Deviation” channels. The Ref Duty channel shows the part of the PID control due to Integral & Normal Position. The Duty Deviation channel shows the Derivative & Proportional parts.

Cam solenoid now shuts down one second after no-cam signal received.

Cam measuring Ref/Sync modes no longer read relative sync position.


Don't know if they would help... but I know once I get the cipher kit next week, I can then monitor the cam solenoid positions as well as if the factory ecu is fighting with motec to gain control of the cams operations...

cheers,

richie

 

done12many:

I reckon your fix should be simply.... probably you have got a faulty VDC computer... you might want to try disconnecting the fuse in the engine bay fuse box and I think the car should drive great! I don't have VDC/SLIP problem at all... and I am guessing if I leave the cam control to the OE ECU, everything will be fine...

cheers,

richie

 

Replacing both of your cam position sensors will fix your "jerking" or mis firing issue. The sensors can go bad from not changing your oil regularly (they get clogged easily). Also, to the poster who told you to take your center console out to disable the VDC: You can remove a fuse in the fuse box under the hood to disable VDC permanetly or just unplug the connector from the box that sits right next to the brake fluid resivor.

 

If you do either of those you will also lose your ABS brakes.

 

And your speedometer. But at least it can help you trouble shoot it. FYI, its easier just to pull the VDC fuse, or the junction terminal next to the brake boost (engine bay)

 

this is not the original topic, but it all doesn't matter...

The best way to switch off the entire traction control is to install a toggle switch in between the ECU and the Yaw sensor... it controls the power going into the yaw sensor.... so you don't have to lift the centre console up all the time to disconnect/connect it back... I did that and it works very well! No problem whatsoever for 1 year already!

cheers,

richie

 

richie,

Sorry I jacked the thread bro. I posted shortly after discovering the problem and figured it could have possibly related, with the low speed jerking and all. Our problems are completely different though.

Sorry about that!

Bill

 

no problem bill, there is no need to say sorry at all!!! It is good to share different problems with each other, so we are aware of people having them and how to solve those...

I still cannot get rid of the jerking, but with slightly more tunings done to it, it has been minimised (not gone yet though)

cheers,

richie

 

i didnt understand the part about the oil pressure and timing thing? can you please be more specific about that? I'm having some problems and getting p0011. The car is working fine but suddenly it starts jerking and shuts off. I get p0011 and p2112.

 

mistaboosta,

I am not too sure myself about what my tuner told me though.. but he used motec cam gauge to see the results himself, as soon as there was a jerk, he saw the cam timing goes to "0" and back to where we set it, and it just kept on doing that... he reckons it "might" be something in the motec software that's causing this... but there are many things that we don't know about factory components... All the other 350z he tuned (without cam or cam gears though) had no problem at all, they drive smoothly with any throttle input at any rpm...

My car jerks a bit at the lighter throttle at 2100rpm, but as soon as you let go the throttle or give up gas, the car will stop jerking straight away... it never stalls when it jerks though... but it is possible that we might have the same problem, just that my car doesn't shut off... and that might be related to the factory components???

Please keep me posted too mate!

cheers,

richie