Q: RPM issue. Car can't produce enough power. Idles low and caps at low RPM.

asked by on

The car runs at very low RPMs and when in idle it sits with an inconsistent rev. It'll jump back and forth between 750 and 500 rpm (and when car it cold it'll drop lower or simply stall) and when given gas it will only rev to about 3000 rpm and essential cap itself (it'll stay there). At first I assumed it was a MAF sensor issue, so we replaced it, but it still is having the same problem. Spark plugs were replaced, sensors were cleaned, belt timings checked. I should mention that a catalytic converter did melt when this problem first started, that's where we assumed it might have been a problem with the MAF sensor and the might be running rich. The odd part to this is occasionally (believed once the car has warmed up a bit) after turning off and turning the car back on, the rev will work like normal. revving to 9000 like normal, but once you turn the car off and restart it, it will go back to it's state of low revs. Any suggestions would be greatly appreciated.

My car has 100000 miles.
My car has a manual transmission.

Hey there, thanks for writing in about your 2001 Nissan Sentra. It sounds like you may have a throttle position sensor issue or idle air control valve issue. If the catalytic convertor was not replaced, it could also still be related to that component. I suggest having a certified technician, like one from YourMechanic, determine the exact cause of your vehicle’s loss of power.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. RPM issue. Car can't produce enough power. Idles low and caps at low RPM.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: my car would stall if I turn on the A/C while idling at a stop... sometimes it would run fine until the engine is not warm

Hello. Most of the time this is caused by a failing air flow sensor or an issue with the throttle body. The throttle body tends to get dirty which causes the throttle plate to not function properly, causing a low...

Q: brake system

Hello. We will be happy to assist you. The brake pedal being lost is likely related to a hydraulic leak and the brake pedal being hard might be related to a faulty brake booster. When changing the ABS pump the...

Q: After driving awhile, when idling, RPM drops below 500 & car stalls. Happens rarely but RPM fluctuates, and drops suddenly.

If you are having a stalling problem then you may have a computer code stored in memory. I suggest having the computer scanned to see if there is any codes stored and diagnose them as needed. The intake hose and...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.