Skip the auto shop - Our mechanics make house calls

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.

A: Hey there, thanks for writing in about your...

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?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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: P0304 code.

You should make sure the mass air flow sensor is connected and inlet to throttle body hooked up. If it is and problem continues then tr to disconnect the MAF sensor and see if engine runs okay? If it does...

Q: heating and cooling system

Hello. I can help you with your 2006 Corolla. It sounds like you have four issues: 1) Overheating 2) Leaking coolant 3) Water Pump installation problem 4) Heater core problem The water pump bolts, which ensure a good seal...

Q: Service Engine soon light began flashing on and off on 2010 Nissan Sentra... Car started sputtering, ... now all dash lights are o

Hi there - the security system is now active, but this sounds more like the car battery has died (sputtering, then dead engine). Have the car battery checked, possible something electrical left on overnight, or battery is just old? Try...

Related articles

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.