OK i've been living with this issue for more than two months and now i need your help guys to find a solution for it.

After changing a head gasket, everything went ok the car was fine until the 1st WOT the car went in to SILENT mode!!! yes silent mode no sound for the engine and every single gauge in the car point 0 except the fuel pressure is 4.0 bar. As soon as i release the pedale it goes back to normal.

After some checking and scan tools i end up with noting the scan show no errors codes and everything under the hood seems to be ok.

So i sart changing old part one by one (fuel injectors, fuel pump, spark plugs, AFR and rearrange ECU harness) after changing these part the car starts normally but after warming up it starts misfiring. I thought to change the F-CON and start the car with my old friend UTEC and i did and the misfiring was even worse.

A week ago i sent the car to my tuner to check whats the issue and retune the F-CON. He change a cam sensor and tune it and got 570 RWHP on pump gas.

I received the car two days ago i drove it around the neighborhood it was grate. Today i took it out for a real test and after a few runs it suddenly starts to misfiring and wont responde to the throttle. And here i am stuck with the same issue.

Any suggestion on what might be the problem?

Thanks in advance.

 

Quick thing that comes to mind is that the car is going into limp mode and you have a really bad mis-fire... If there is a mis-fire still then there should be a code telling you it is a random cylinder mis-fire or that it is cylinder specific... Has anything changed on the car recently?

 

is your abs vdc or slip light on?

 

No its not the same car and there is no codes at all. The only change on the car is a head gasket.

 

yes both goes on after moving the car 10 feet.
I have a problem with the ABS since a year but the car was working fine.

 

check your speed sensors. log it on cipher or run a data stream on your scanner to see which one is going south.

 

OK. ill do the test today and let you know the result.

One question, could it be the crank poisson sensor?

 

no, if it was the crank sensor, you'd get a code

 

Thanks,

 

Johnny, once again here to help out the community. You da best!

 

For the ABS lights: Your steering knuckle may have been installed in the wrong position.

 

Cipher can pull your ABS codes. There's no need to log anything in most cases. Had issues after my camber kit and ABS codes told me exactly where to look.

 

The very first issue you discribed sounded like your CPS but you would get a code for it. That used to happen in my GF's VQ35 swapped maxima while going WOT then it would go back to normal once I stopped.

 

Did you happen to remove the steering shaft cause when i was installing my turbo's a long time ago mine did the same thing almost.

 

yes i did. so you suggest to remove the steering shaft and reinstall it in the correct position.

 

A friend of mine is also saying it might be the CPS. I will check it tomorrow i will lose nothing. Thanks for sharing.

 

I was going to say steering position sensor, might need to be reset.

 

And how to do that?

 

That is the same thing i had to do to mine as i put it back together a couple teeth apart.Until you get it reset at the dealer try this...turn the wheel all the way to the right when you start the car and the lights should stay off and let you drive the car normally.

 

Seems electrical to me. Grounding perhaps. When the engine is torquing in the engine bay something is coming loose. Check all engine grounds especially the two front ones (timing cover)