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there is a few cars that will rev like this that is the auto choke to some engines coming into play (mostly noted on a dodge 1500 v6 mag year model 2000) this is sometimes normal as the auto choke will rev the motor for a while or so before letting the motor calm down per-say as the motor is warming up
motors do not rev up because they are not getting correct air/fuel for the throttle opening. So check that the accelerator position sensor is working and if you have a cable operated throttle to the body check that it is not broken. IT may be your throttle motor is not working
Hi Tom your vehicle is equipped with a Rev limiter it will not allow you to rev the engine above 4000 with the trans in park; as for the first problem you may have one of two things, one of the spark plugs or spark plug wires is bad or you have a flat spot on the throttle positioning sensor in which case have be replaced. Good luck?
i know these post may be old but i found the solution to rev problem, i have a 94 accord ex was revin' at abbout 3200rpm, so i ran a diagnostic and found it to be the crank sensor(code 4). not what you may or may not know this sensor is part of the distributor. so you can do one of two things go to a salvage yard and try to lacate one ($100) or buy it new ($400). after install reset the ecm and let it recalibrate and you ready to roll.
What fuse did they change? Are you sure it wasn't a relay or sensor they changed? You need to check the computer codes and test the fuel pressure. It wouldn't be a clogged catalytic converter if it happens only occasionally but could be a bad O2 sensor, fuel pump or filter, fuel pressure regulator, VSS (vehicle speed sensor), dirty throttle body or bad IAC motor, throttle position sensor, MAF sensor. See there's lots of things to check that's why you need to check the codes and fuel pressure first.
it would not be an O2 sensor, period, they would never cause a high idle, have u had this checked for trouble codes? A sticking idle speed control air bypass can cause this problem as well as a throttle position sensor, but run the codes, Kragen does it for free was well as other parts stores.