Car deccelerates when trying to accelerate

[Nuno]

I have noticed a new problem yesterday. When I put put my foot down to accelerate the car starts to deccelerate for 1-2secs when it reaches around 4-5000rpm, it slows down by 5-10mph and drops 500rpm, then after continues to accelerate. 1st gear is fine but it only happens with 2nd gear onwards. Gear changing is not a problem, only the decceleration when I don't want it to deccelerate. Anyone know what's wrong or had the same problem and how I can rectify it?

[jacr87]

gear is fine but it only happens with 2nd gear onwards. Is there any lights thrown up on you dash? Secondly have you tried resetting your ECU or using the sequence to activate the fault codes?

[M13KYF]

+1

[Nuno]

No there aren't any warning lights. I'll try to reset the ecu once I figure out how to do it to see if it helps. What do you mean by sequence to activate the fault code?

 

I also read the sticking throttle thread. Would using a fuel additive or cleaning the throttle body help in this situation?

[jacr87]

No there aren't any warning lights. I'll try to reset the ecu once I figure out how to do it to see if it helps. What do you mean by sequence to activate the fault code?

 

I also read the sticking throttle thread. Would using a fuel additive or cleaning the throttle body help in this situation?

 

See this link for the fault code sequence and resseting procedure.

http://forums.nicoclub.com/zerothread/182298

 

Is your car modified if so what is done?

 

Failing that there is no gear indicators on this car and your Z could be running on limp mode Which by doing the fault code sequence I hope you get something to appear failing that It could be A trip to the Nissan Dealership mate.

 

i.e

Does the car have a CAI (cold air induction kit) or a D1 spec throttle controller.

 

It seems the throttle could be fine but you are not gaining the right mixture of air and fuel.

[M13KYF]

bigger lists of codes here

 

viewtopic.php?f=17&t=21762

[cookiemonster]

I noticed when i put the D1 throttle controller on that if the connection for the accelerator pedal isnt 100% connected properly you can feel a drop in speed occasionally when cruising and more so when accelerting. Could possibly be this?

[CaptainSensible]

This might be stating the obvious, but it's not the TCS kicking in?

[H5]

And it is definitely in gear?? Sorry if that sounds insulting, not meant to, just whether the car is going into gear properly?

[narcotix]

This might be stating the obvious, but it's not the TCS kicking in?

 

+1

 

LoL ... was just about to ask the same question ...

 

[Nuno]

Thanks for the replies. The car has not been modified and yes it's in gear correctly. I have tried to reset the ecu via the manual method but I can't seem to get the cel light to blink, so it seems as though it's not being done properly but I hav follwed the steps correctly. Is there any other way to do it myself without any equipment or will I have to take it to the dealer to reset the ecu?

[jacr87]

It takes practice mate. I would keep trying as you will get hammered by the dealership for getting this done.

[nicon2k]

Could it be a fault with your shoes? Not pressing both pedels at the same time?

[M13KYF]

timing is critical in doing the ecu reset

[Nuno]

I managed to complete the first part, buy am confused with the second part....

 

" Without Consult

Turn ignition On.

Turn diagnostic mode selector on ECU fully clockwise and wait until inspection lamps flash. #Number of flashes displayed indicates corresponding mode.

Note number of flashes, then immediately turn diagnostic mode selector fully counterclockwise."

 

where is the diagnostic mode selector and ecu?