I got a throttle problem on my 2003 350z Touring. A couple days ago i went to start it up amd it started fine, but when i tried to give it some gas the RPM's wouldnt go over about 1500 (guessing its goes into LIMP Mode). And my check engine, Slip and another light that i cant recal came on. So i tried driving it and it drives but cant go over like 2 mph. So i had a friend run a OBD Scan on it and he shut of all the lights except 2, they kept coming on, and it still had the same throttle problem. So he said that the scanner shows that the Sensor on the Gas Pedal itself is bad and is not reading anything, so today i drove 2 hours to pick up a used Pedal assy with a sensor from a Used Parts Store, so when i got back i put on the new pedal and sensor and it didnt fix anything, still the same throttle problem and same light stay on. Do you guys know what this can be?? Did i just happen to buy another bad pedal? or is this commen on the 350z and its something els that i should be looking into replacing? Please help. Thanks

 

What 2 codes is it giving you?

 

Ill have to run it tomorrow again and write them down, but it lights up VDC Off, Service Engine Soon, and SLIP. And it dont wana rev over 1500 rpms

 

There is a similar thread in this section:

Engine doesn't rev past 2500RPM

 

Throttle body needs to be replaced.

 

Even tho its not giving a code for the TPS in the Throttle body? Cuz its giving a code for the Sensor that is on the gas pedal, but i went out an got another used one and put that on and it still does the same thing..

 

Yes, Sometimes the throttle body will fail without any error codes.

If you replaced the throttle body without doing the reset procedure (or doing it un-correctly) you will still be in limp mode.

 

They needs to be replaced.

 

Get a code and report back here. Sounds like a cam sensor or crank sensor went out. You can buy these from courtesy nissan online for about $60 and spend 30 mins replacing them.
Your throttle body should be fine.

 

Get the codes read again, post them here. I will get you the diag. charts so you can diag. what the problem is... otherwise feel free to shotgun more parts at it.

 

What is the reset procedure after installing a new throttle body?

 

Update on the situation: Im waiting for my buddy to come back to the states with his OBD scanner so i can get the exact codes and post them up here, but meanwhile yesterday I went to start the car and it started good and was reving up normally all the way up to red line. So i was happy thinking the problem fixed itself and as soon as i was going to drive it out of the driveway to take it for a test spin around the block the VDC OFF and SLIP lights went back on and it went back into limp mode and dont wana rev over 1500 RPM's again.. i was bummed out.. So i barely got it back up on my driveway and tried starting it again and again and its was still in limp mode, then i let it sit for a little and tried starting it agian and it was again back to normal revs's for like 15 sec and then went back into limp mode... What could this be? But yesterday i went to the junkyard and bought another throttle body cuz they have 90 day refunds for there parts, well i put in the new throttle body and tried starting it and it would keep turning over but wouldnt start, so i kept trying again and agian until it started and would idle normally but was still in limp mode and the VDC OFF and SLIP lights were still on and it still didnt rev over 1500 rpm's.. this is strange..

 

did you reset the ecu once you put on the new TB?? The ecu doesn't know that you put on a new TB. it still sees the old codes.

 

No i didnt, maybe thats why it was still trippin out. I just didnt have the OBD Scanner to do so. But tonight i decided to go ahead and take off the Throttle Body I bought to go return it and put on the one that was originally in there, and when i did that and thew the original TB in the Z its started right up and was reving normally. So i took it for a spin around the Block and it went LIMP mode on me agian, so i turned it off and started it again and agian like 3 times until it started normally and reved up normally. So i drove it back up on the driveway and restarted the car about 10 times and its been Reving up normally now, its strange. Not sure what the problem was or if it went away for good or not?

 

Isn't there something about aftermarket brake lights or incorrect tire diameters causing this problem?

 

Not sure but i got factory OEM taillights, but i do have 19"s but i dont see what that has to do with the throttle or REV's

 

did you properly do the reset?

the car has to be hot and transmission up to temp before the reset takes.

I fought with similar issue until I did the reset properly.

From the FSM page 44 has great diagram http://www.vqfrenzy.com/downloads/20...anual/B/ec.pdf

PREPARATION
Before performing Idle Air Volume Learning, make sure that all of the following conditions are satisfied.
Learning will be cancelled if any of the following conditions are missed for even a moment.

Battery voltage: More than 12.9V (At idle)

Engine coolant temperature: 70 - 100°C (158 - 212°F)

PNP switch: ON

Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
On vehicles equipped with daytime light systems, if the parking brake is applied before the engine
is started, the headlamp will not be illuminated.

Steering wheel: Neutral (Straight-ahead position)

Vehicle speed: Stopped

Transmission: Warmed-up
For A/T models with CONSULT-II, drive vehicle until “ATF TEMP SE 1” in “DATA MONITOR” mode of “A/
T” system indicates less than 0.9V.
For A/T models without CONSULT-II and M/T models, drive vehicle for 10 minutes.

 

If the front and rear tire diameters aren't within a certain percentage of each other, it causes the ECU to think the wheels are slipping/spinning, and that puts the car in limp mode.