When I stomp on the gas my car never goes over ~2300 rmp. I take it off over drive and still get same results. 2 weeks ago I cleaned throttle body and changed coolent temp. I plan on changing knock sensor. If someone has any suggestion please let me know.

thanks.

95 Max GLE... (Automatic)

 

Sounds like a ECU problem. If it runs fine in the under 2.3K area I would bet that is it. It is the only item you have that controls that.. But to be sure you don't have a stupid problem open your hood when the car is on and move the throttle by hand.

 

Try checking the fourms at www.freshalloy.com; there might be something on there.

 

Check your MAF sensor. The same thing happened to me when my MAF sensor got shorted out.

 

everything seems to run fine, the trans. shifts to all gears it just never goes over 2300 no matter what. No check engine light.

If its the MAF sensor what do i need to do to fix this problem.

 

Is it throwing any codes?? Sounds like it should be.

 

i've had a engine coolent and knock sensor code. After doing the TB clean, adjust idle and change ECTS i reset the ECU code. Nothing has come back yet, it's been 3 wks. I am going to change knock sensor this weekend. The car runs fine, i do not feel anything different but the rpm never goes past ~2300.

 

Well, I work at a Nissan Dealership so I will ask one of the techs tomorrow about your delema and see what they say.

 

thanks Kmax2988...

 

Highly likely it's the MAF.I had the same problem when I hooked up my turbo and one of the pipes wasn't on the MAF.

 

Thats exactly what our cars do when the MAF is not working or bypassed. Are you SURE your not getting a CEL? Is the bulb burnt out in the dash perhaps??????

You should be getting a CEL with 0102 as the code.

 

No check engine light, when i turn the egnition on the CEL is lite up. I can try checking the code again to see if it will give me a code. I was getting ECTS and KS code but now I have no CEL. Can I replace the sensor or do I have to changethe MAF? What do you mean bypass, I have stock air filter box and am sure all hoses are connected.

 

hummm....

your ECU is in fail safe mode, meaning it wont go over 2300rpm to prevent you from blowing up your motor. it could the MAF, Coolant temp sensor, or others. if you hooked up a scan tool to it you would be able get more information. My coolant temp sensor went bad once and didnt throw any codes but resistance on the sensor was wayy off. Another clue you can get is if your cooling fans are on all the time. I diagnosed a 97 Max once that ran bad for the first 30 sec of starting up but ran perfect afterwards. cooling fans were on all the time and afterwhile it didnt go over 2300rpm. replace coolant temp sensor and all was well.

 

About 3 weeks ago I replaced the ECTS on my car. Took a look last night to make sure all hoses and cable are plugged in. What sensor is connected to the air box itself? Is the MAF sensor replaceable or do you you have to replace the whole MAF??

Thank

 

Check to see that you installed the intake part to the Throttle BOdy right.

Sometimes when installed backwards, the screw that holds the hose to the throttle body blocks the cables that revs your engine.

Open your engine, and grab the cables when the engine is on and see if it is being restricted. I had this happen to me when mechanics at a quick lube place installed it back wards.

There should be a little nub to tell you how to position the hose.

Let me know how you make out.

Kyle

 

Do you guys think my tachometer/guage cluster is bad? My odometer stop working about 2 yrs ago, never had a chance or wanted to get a replacement.

 

Here goes nothing. Talked to the tech and he seems to think your Throttle Positioning Sensor is reading the wrong voltage at wide open throttle. You should check the voltage of that thing with a multimeter. He thinks but is not sure that the signal wire (+) is white but if you don't get any voltage then check around different wires. At idle the voltage should be .48V and at wide open throttle, around 5V give or take a few (4.8, 4.7, ect.). If it's lower then this (or higher) your TPS is bad and you'll need a new one. Good luck with finding the problem, hope this helps.

 

If you need help finding your TPS, check this site:

http://www.vbxmaxima.8m.com/tps.html

 

hehehe...the same thing happened to me when i installed my Hybrid intake. the screw for the clamps holding the hose to the throttle body was restricting the throttle cable :P and my RPMs wouldn't go over 3k and i realized this only when i started accelerating on the entrance ramp to the freeway. i was like "WTF?", so i called my friend who had helped my install the intake and we met up again, disconnected the hoses and reconnected them, checked the sensors and after going through all this, we realized how dumb we had been and all we had to do was turn the clamp a little in the clockwise direction to get the screw out of the way of the throttle cable
VOILA !! soon i could reach the redline

 

My redundant answer will be that its the MAF Sensor.

 

??what you mean "it runs fine" my max doesn't even shift into second gear until around 2600 rpm. whats the top speed you can get from that type of rpm??

 

My max speed 70+ on hwy. The tranny shifts to all gears the only thing i could think of could be a bad tach. I do not have any of the symptoms that goes with MAF or TPS.

Kmax2988, i check the voltage its around 2, but i'm not really sure im using the multileter correctly. the omh's measure 532@idle and 419 @ full throttle. I tried removing the screws to adjust the tps but it was too tight. thanks for the info kmax2958.

I may just take it to the shop and have them look at it.

 

If the voltage is 2 at full throttle (or idle for that case), you need a new tps. As long as you have the multimeter set on volts (or mV[1V = 1000mV] it should say on the screen what units you're in) then you should be reading right. Just keep posting if you have any more questions.

 

I folloewd vbxmaxima how2. Set the multimeter to AC V and removed the TPS connector, turn ignition to the on position. Used the multimeter to get voltage. Sometime it would register orther times it would not. Then it set the multimeter to K(omega) and touch pins 2&3 with car off. At no throtle it measured 532 and push throttle cable to max it measured 419. I'm not sure about the multimeter setting for testing the voltage.

 

Thats the fun thing about multimeters, they can be a ***** to hook up at times! Well, as long as you followed the guide on vbmaxima then you should be reading correctly. You just have to be patient and very steady until you can get some good readings. As for ohms, I don't know what the resistance is in the tps but I'll ask tonight (I have to work till 9). Hope you can get those readings, good luck again.

 

OK, i bought some aligator clip to get better contact with the TPS pin. When i checked the voltage it did measure ~6v. I tried it a couple of times just to make sure. When i measure the omh it still reads 532 @ idle and 412@ full throtle.

I'm going to try again to adjust the TPS back to the same omh's.

 

The ~6V is at full throttle right? The tech told me ~5V at that point (that might be the prob). Anyway, he also told me that they usually check the voltage and not the ohms so he didn't know any ohm readings.

 

Going by vbxmaxima, this is what i did. unplug TPS turn ignition on and measure volatge,he said it should be 5v. step 2 according to vbxmax is to trun car on and warm it up, turn car off and measure the omhs by putting the multimeter to pin 2&3. At idle it should read 500 and you press the gas(car is off,i just push the throttle up the omhs should go up but at full throttle the omh should read 400omh.

did he tell you how to measure the voltage or adjust the TPS?
thanks for all the help.

 

He just told me how to measure it, not how to adjust it. I could ask him tomorrow for you though (workin till 6 then goin to the track [IMPORT NATIONALS!!!!!]).

 

Well, if you still feel like messing with your tps, my tech told me to try measuring the voltage (with the car on or with the key on) in gradual steps. By this he means to take the voltage reading at idle, then SLOWLY begin to rotate the throttle keeping your eye on the voltage. Next, if you notice any jumps or drops in the voltage (like if it goes from 2V to 4V or 2V to 0.1V) the the tps is bad. But if all else fails, just take the damn thing to a dealership and have them figure it out for you.

 

thanks for all your help man....
I think it on it's way to going bad.

 

Anytime man. Just glad I could be of some help.