Q: Why does my engine choke at low rpm?

asked by on

Engine runs strong when cold, once it warms up from low rpm the engine feels like its choking & it shakes , it goes away after around 4k rpm.
My car has a manual transmission.

This may be caused by a number of things such as a bad fuel pump relay or potentially a faulty ignition coil. Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeatedly. The insulation develops small fractures that open when heated and close when cooled. When open, they allow shorting of coil windings and decrease or eliminate the coil’s ability to function. This type of temperature cycling happens because every time you shut the engine off, the fan stops running, the coolant stops flowing and the temperature under the hood rises. Every time you start the engine again the coolant flows, the fans turn on, and the temperature drops. When this heat dissipates and is absorbed under the hood, it is trapped causing this cycling effect. Other components that contain heat sensitive materials include parts like fuel injectors, igniters, and some sensors. Any of these may be potentially subject to this same kind of heat cycling problem which can be very difficult to trace. I would recommend having an expert from YourMechanic come to your location to take a look at your vehicle.

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. Why does my engine choke 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: Water pump, oil leak, and alternator problems

From the description it would appear the three problems are probably unrelated. A failing water pump would usually only be indicated visually by a leak, or overheating of the vehicle. In regards to the oil leak, we would have to...

Q: I can't get the axle out of the driver side hub.

The axle constant velocity (CV) joint has splines that go through the outer hub assembly secured with a large nut. Sometime when the CV axle needs to be removed the splines of the CV joint will rust and corrode then...

Q: P0141 OBD-II Trouble Code for a 2005 Honda Accord. Is this serious? Can I drive with it?

You can drive the car normally and get it repaired at your earliest convenience. The trouble code that you are referring to, P0141, typically means that the heater element in an oxygen sensor is not functioning or the circuit to...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...