I am in dire need of assistance with diagnosing a strange symptom my 2008 Nissan Altima Coupe 4cyl 2.5s is doing.
It all started on a drive to Utah from Arizona. We were going up an incline and got cut off by another car and had to push on the brakes. Upon trying to resume accelerating, we got not response from the gas pedal. Nothing at all, besides a slight acceleration until we pulled off the road. I could push the pedal to the floor with little to no response, and mostly no response. I turn the car off for a few minutes, started it up, and we were somewhat back to normal. It accelerated, but didn't have power behind it. It took much more to get to 80mph, or even 60mph.
But then, it would drive fine. For two days, it ran fine without incident. But on the drive home after a couple hours, I had it in cruise control, and heading up a hill it just kicked me out of cruise, and when I hit the pedal I got no response. Though it didn't slow down as if I removed my foot from the pedal, it slowly dropped mph until we pulled off again. If we turned the car off for a few minutes it would return to working (Though seemed to have lag in throttle.). It did it a few times more. Today during local driving it just seems to have a lack of response and throttle, taking more effort to accelerate.
It may have started a few days before the trip my girlfriend said (it's her car), as she said it did the symptom of not accelerating as fast as normal.
Any and all help is appreciated! Thanks in advance!
You need to scan for codes and check fuel pressure with a gauge first auto parts rent it
June, 9, 2014 AT 1:41 PM
Even though there are no lights on?
June, 9, 2014 AT 2:54 PM
No light will normally go on with low fuel pressure
June, 9, 2014 AT 3:55 PM
Reading about the symptoms of low fuel pressure, it doesn't sound like it. The car never sputters, jerks, or has any other symptom besides no response when the gas pedal is pressed. The engine runs sound, and idles perfectly. We drove at least 300 miles before it happened on the way back, the first time.
My initial thoughts are the throttle body, or some sensor or electoral compenent. But, I am not even remotely comfortable with diagnosing mechanics.
June, 9, 2014 AT 3:58 PM
Actually one other thing to add, when it does this, and right before it revs to over 3k rpms, and sometimes past 4k before it stops responding at all. That's the case also when it has a hard time accelerating.
June, 9, 2014 AT 4:10 PM
Until you scan for codes and check fuel pressure which are the basics you don't even have a clue where you are. Your computer could have stored a code and you don't know it. Also you need to check intake vacuum if 15" or below suspect a clogged converter/exhaust system. Or a clogged air intake for that matter.
September, 16, 2014 AT 1:35 PM
I have a very similar condition- with a 2008 Nissan Altima 2.5s Sedan- the first occurrence was around 75K on an incline at about 7,000 ft elevation near Colorado Springs. The second was more crucial, at a higher elevation (9500+), maybe 4K more on the odometer. In the first instance I found a parts store and being away from home, I decided to replace the air filter to see if that would work. It seemed to work, I had no further problems with the car until the more recent episode. In the case of the second problem I was ferrying my wife to pick up a car we had purchased; the dealer is a personal friend, and I asked him about the problem. He is an ex-GM factory rep and a multi-brand dealer (not Nissan). He was sure that it was NOT the air filter, that it is the fuel filter / fuel pump. I still don't know. The car ran fine over the high elevation and incline on the return trip, but I took it easy. I would like to know if there is any resolution to the problem since the circumstances are so similar. I have looked to see if this is a known problem with this car, Nissan seems to have a blind spot when it comes to high altitude- I say this because of experience with the tire pressure warning light. It comes on every winter, for as long as the cold weather continues, they have no fix or adjustment to address that problem.
Again, I wonder if your problem has been diagnosed, since there is no follow-up to the fuel pressure advice.
September, 4, 2015 AT 5:36 PM
I had this problem. It started after a problem I had with my car not starting and I replaced the brake switch on the brake pedal myself ( 38.00 at autozone, cheaper online. Easy fix by the way - no tools necessary - and it can be done in 3-5 minutes but i've seen people online pay between 500-700 to have this fixed at the dealer). Anyway, when I installed the new switch, I didnt push it all the way in so my brake lights were continuously on for about an hour before I realized there was an issue. I did not realize they were on because it was day time, however, I did notice that once I installed the new switch, not only did my car start with ease, but I didnt have to press the brake for it to be started. The way the switch is designed, there is a clicker at the end and when it's installed correctly, it is pressed in. When you press the brake pedal, it depresses (unpresses?) And your brake lights come on so if the switch is not all the way in, the brake lights will be on (because your car thinks your pressing the brakes), and it will be like you're driving with the brakes on (this is the most logical thing that I can think of for the slow acceleration). Anyway the only reason I noticed my brake lights were on was because when I got home and parked in the garage, I saw them reflecting on the garage door and they didnt turn off after I got out the car like they normally do. So after properly installing the switch (pushing it in a little more and then locking it), the brake lights turned off, the car no longer started without pressing the brake and normal acceleration resumed. Anyway, hope you were able to figure this out without shelling out hundreds to do so (if your problem was the same as mine anyway).