When I accelerate the engine goes up to about 4000 RPMs but does not speed up like it should at that RPM level. I have tried different things like taking the OD off...but that really makes no difference. It is acting like it is not firing on all cylinders. Or maybe a plug or two is bad? Any help would be great.
2003 Nissan Pathfinder SE
Last oil change was 4 months ago
I recently experienced the same scenario. No matter how much gas I gave it, I could not get the speed past 70 mph and engine was at 4000 rpms. At the first opportunity we stopped about 30 miles later, no gas stations on the highway. Oil was ok, added fuel injector cleaner, and filled the tank. Almost immediately we were at 70 mph and the 3000 rpms.
Our Pathfinder has 110k miles and the original owner. In the past noticed similar experiences going up hills.
Where do you live? We’re in CA. Wondering if a recall is in sight!
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Not driving a corvette? Just kidding. More details are important. How slow is your acceleration? Is it 0-60 in 8 seconds, or 20 seconds? What is redline on your car? If redline is 5K then 4000 is a good responsible shift point. If redline is 8K then shifting at 4000 is probably robbing your engine of it's torque and horsepower band. I believe the GTS model has an 8K RPM redline, the GT may be lower, but in that case, shifting at 4K is too soon for strong acceleration. Your Tachometer should have redline clearly marked. For responsible use, stay below that, maybe 10-20%. For economy stay further still, but for power you need to let the engine use it's RPMS, especially smaller and fewer cylinder engines usually don't make their power until they are half way through the RPM range and above.
With normal acceleration the 1st to second shift point should be around 2500-3000 rpm. Most of your shifts under moderate acceleration will take place at this same point or when there a light load on the transmission. Under hard acceleration the RPMs will climp higher due to increased power needs and the computer will shift when less power is needed or the RPMs climb to an unsafe speed say5000-6000rpms (depending on where yours redlines). Also going up a steep hill will raise the RPMs higher and goind down a hill will cause a faster shift at lower RPMs. These can always be altered by an individual owner by adjusting shift points, using performance parts and if you have problems (low tranny fluid/trans issues). Your trans RPMS are fine and will vary depening on how your foot accelerates. The shift pattern should be the same every time you drive slow/medium/fast/, look for changes in those patterns you will also catch a problem early.