in relationship to engine rpms a ratio of something like 3.08 would have less acceleration and lower highway rpms compared to 4.11s. the 4.11 ratio would give you better acceleration and less top speed and lower gas mileage at highway speed
mass air flow sensor
If it's a manual tranny, your clutch going bad
It appears that you may be suffering from the same problem i had a while back. Have you checked the wires to the alternator or even the plugs because the rev counter on a lot of cars runs of the alternator. Or it could be the alternator on the way out.
If you have an engine that idles at 6000 rpms, you need to have it checked - immediately. Around 750 rpms would be normal.
maybe your rpms gauge is broken.get it looked at by a professional
Much quicker off the line, but the trade off is lower top speed and higher RPMs at highway speeds.
Well it should be going about 4000 rpms
major vacuum leak?
No it is not. Before it would hurt the valve train, something would have to happen at a very high RPMs. The timing chain going out will not hurt the valves are the head.
A front or rear hub bearing assembly going bad could sound like that.
Check the timing and check that the cable to the accelerator is adjusted correctly.
5,000 RPMS. If the lifters don't float out first.That would be a safe range as far as RPMS. go.
VALVE LIFTERS... the fact that the ticking does not increase with rpms rules out valve tapping or worn piston pin but is indicative of the bearings going bad in the water pump which also would explain the loss of performance.
2 rpms? Your automobile engine probably runs around 2000 rpms. At 2 rpms the engine would stall and stop. However, many automatic transmissions jerk a little bit as they shift gears. I suspect this is what is happening to your Pathfinder.
It would depend on the gear ratio and transmission. stock tires 235/70r16: auto(O/D) with 3.55 gears =2160 rpms auto(O/D) with 3.73gears = 2270 rpms manual with 3.73s = 2360 rpms
No no no, 3000-4000 rpms is the average speed for highway traveling, driving too close to the red mark on your rpm is bad
about 12, 13,000 RPMS.
lower rpms use less gas higher rpms have more power
the rpms should rise and then drop no more then 500 rpms when the fan on the radiator turns on and then off.
Situation dependent. Most schools will teach you to upshift at 1500 RPMs with any transmission. Which is fine and dandy if you're running long distances on flat terrain, and won't be shifting much throughout the day. But if you're going up mountains, or going from traffic light to traffic light, you're going to bog your motor down severely, and reduce component life. In these instances, you want to shift between 1800 - 2000 RPMs. This means you'll also catch your next gear in a higher RPM range than you would if you shifted at 1500 RPMs.
because the engine needs to have a 20 seconds RPMs
Check you spark plugs. Probably going to need to replace them.
igniter is possibility