2001 Nissan Altima trouble accelerating;like its not gettin

Tiny
EVILEYEJONES
  • MEMBER
  • 2001 NISSAN ALTIMA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 141,000 MILES
The problem:
The car starts fine, no auditory signs of anything being wrong.

whenever you start to move is the problem, when you give it gas the engine starts to react (rpms rise however high, depending on how much gas you give it) but the car has to slowly build up momentum to get moving.

by slowly build up momentum, I mean that it rises at a rate of about 5mph every second; regardless of how much gas you are giving it, or how many rpms the engine is turning.

the rate that the momentum builds up is the same even if you only lightly push the gas, and if you floor it (tho if you floor it, it will do a jump when it switches gears at very high rpms, but speeds are about the same)


ok, first to eliminate suggestions
after the problem started I did all of the following:
1) complete tuneup, new plugs, cords, oil/filter change, air flilter change, radiator fluid, etc.

2) took it to a friend up at nissan service center, they checked for codes, and then checked a few other things (MAF sensor, compression, etc [can't remember them all]) they were stumped, and suggested we check it with a muffler shop for the catalytic converter

3)took it to Pronto Muffler, and they did a full check up on it and said that, there were no codes (which we knew), and that the cat and entire exhaust system looked fine. I had them drive the car, to see if that would help them better understand the problem. And they checked the cat again. They then said the cat is fine and replacing it would probably not fix the problem, and the technician said that it felt like the vehicle was starving for gas when it accelerates.

4) with a lack of option I called firestone and asked what they would charge to look it over and try to find the problem, after explaining the problem, they referred me to AAMCO for the transmission. AAMCO did a full check on the transmission and said it was in good working condition and was not the problem. They did say that the front cat was running way too hot and was probably plugged or clogged, and that I needed to bring it over to pronto muffler to have it checked out (they are within a mile of each other).

5) I took it BACK to pronto and told them what the AAMCO guys said, they checked the car and said that they could not find a problem with it, they would replace it if I wanted to but they ust wanted me to know before hand that it is perfectly fine and would probably not fix the underlying problem.

so now I am just sort of at a loss of what to do.
any suggestions would be greatly appreciated.

-Jeff
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Monday, February 23rd, 2009 AT 1:21 PM

1 Reply

Tiny
KHLOW2008
  • EXPERT
Hi Jeff,

Thank you for the donation.

Seems you have already spent a lot of time on the problem without getting any results and that definitely is frustrating.

I have here the general things that could possibly cause poor acceleration.

Though no codes were stored, while doing diagnostics, did you get the data readings of all of the sensors and were any out of specs or near its limit?

Check Throttle Position (TP) sensor circuit and adjustment.
Check battery and charging system.
Check ignition circuits.
Check fuel pump circuit.
Check fuel injector circuits.
Check fuel pressure regulator.
Check Exhaust Gas Recirculation (EGR) system.
Check PCV system.
Check Camshaft Position (CMP) sensor circuit.
Check Mass Airflow (MAF) sensor circuit.
Check front Heated Oxygen Sensor (HO2S) circuit.
Check Engine Coolant Temperature (ECT) sensor circuit.
Check Park/Neutral Position (PNP) switch circuit.
Check knock sensor circuit.
Check Vehicle Speed Sensor (VSS) circuit.
Check ECM power supply and ground circuits.
Check fuel delivery system.
Check engine mechanical condition.
Check Idle Air Control Valve-Auxiliary Air Control (IACV-AAC) valve circuit.
Check EVAP system.
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Monday, February 23rd, 2009 AT 2:55 PM

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