My car just recently started losing power below 4K RPM since it started getting hotter. It will drive fine when it is cold but after the car warms up it starts to get weaker acceleration. When I floor it past 4K RPM its will drive fine for a while then the problem comes back a minute later. It does this 3 or 4 times then the check engine light turns on and the car drives fine again. My car is a 1991 Honda Accord EX Wagon with 180K miles. The motor and transmission was replaced at 160K.
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Re: Reduced power below 4000 RPM
The main relay also controls the transmission and will cause an intermittent interruption of power and indicates its going bad. about a $60.00 replacement cost. the relay is located under left side of dash.
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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.
hello does any one know what it mean when a Volvo s60t losing power down on power after 3/4K rpm idles at 800rpm fine and some times it takes at least 5 times till the car starts please let me know thank you
RPM and speed do not match what I'd expect to see at 120. but that could be gear ratio being different than I'd expect. Most don't like to run at 4k. Most problems at that rpm is either plugs (experiment with different gap settings or change heat range one step colder or hotter) or can be coil related (work fine except when recovery time is shortened due to rpm). However, the weird noise may be due to a partially plugged catalytic converter. So, check that as well. If you have a knock sensor, test that too.