Question about 1996 Nissan Altima

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Car intermittently dies, uneven throttle, computer not reporting correctly

Had it to the mechanic they said the engine RPM was not reading correctly on their computer. Throwing throttle position sensor code (TPS). Replaced it still same problem. Ran out of money and it was suggested I try replacing ECU. Replaced ECU same problem. I know my mechanic a little and he told me to check the wiring. I read online and it seems it could be any number of things. I will try to describe the problem better below: When it started I could drive it, it was just rough on acceleration in 2000-3000 band. It got to where I couldn't drive it, and when the TPS didn't fix it I was able to drive it for a while with the TPS unplugged. The problem seems to come and go as I was recently driving it with no TPS. Tried to replace the ECU and still same thing.

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  • Travis W
    Travis W Nov 20, 2013

    Throttle is uneven. Acceleration bad between 2000-3000. Sometimes trouble starting. Sometimes works just fine.


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  • 90 Answers

I had a similar problem with my 280 Datsun. It turned out to be the fuel pressure sensor located near the fuel injectors. Some of them come with a vacuum hose attached.

Posted on Nov 21, 2013

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Posted on Jan 02, 2017

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SOURCE: throttle position sensor

did your car have (ETS) electronic throttle control system
the TPSis a part of this system
but you can test it by using diagnoses scan tool to check the TPS value when press or depress the accelerator pad.
so you can tell us the NO. of DTC for example(P0122)

Posted on Jul 14, 2008

  • 1214 Answers


Could be any one, or more, of the following -

Plugged injector
Bad plug wire
Fouled plug
Crossed plug wires (hard to tell sometimes on V-8s that run smooth anyway)
Vacuum leak
Leaky EGR valve
Shifted timing sensor

Scan engine for codes and proceed from there.

There is a product called RXP (available here in Texas) that will clean up an engine and gas. Its pretty awesome stuff, and this coming from a person who doesn't really believe in additives.

Posted on Jan 24, 2009

  • 64 Answers

SOURCE: a p0011 code and camshaft sensor replacement did not cure problem

well i know on the v6 that is true you replaced all of them. Not sure of 4 cyl but seems like it should be the same. Also I know on the v6 the variable valve timing set up sometimes did some weird failures triggering a cam sensor code. It could be anything from sludgy oil hanging up in the vvt hub or clogged passages or bad solenoids. but before going into all that(well besides maybe an oil change) I would go for the crank sensor.

Posted on Apr 07, 2009

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The car will not hold rpm.

If you check engine light is on the computer has a code to show what sensor is having issues or perhaps is broken.

If you can keep the car running by staying on the gas pedal its most likely a broken throttle position sensor or a broken idle air control.

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Find an autoparts store that will read your on board diagnostic code *(called OBD 2 for short) for free and see if the code is something that just requires a new part.

TPS for a Nissan Maxima is 130-150 bucks! So doing this cheap is not going to be easy! The idle air control is over 200 bucks! Yipes!

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Now...when you unplug the IAC, you will find either a normal minimum idle, or no change at all. If there is no change, and the throttle is not sticking open, suspect air is getting around the throttle plate, which could be a bad IAC, because thats exactly what it does, it allows air to enter the engine around the throttle plate. Normally the computer has complete control of the IAC, but it can fail mechanically, so it must be checked.
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