Q: Jerking apon acceleration

asked by on

Engine runs strong and fine until it warms up. Once it warms up and I accelerate, it doesn't take off then all of the sudden it jerks forward and then the service engine light comes on and the truck has close to no power after that. The service engine light reads a knock sensor code but I've already replaced the knock sensor.
My car has an automatic transmission.

Further diagnosis as to why the check engine light is on should be done. A repeat code for the knock sensor may be caused by a wiring issue or even due to a faulty pcm (power control module). Odds are however, that something else is wrong, causing the knock sensor to detect knocking or be triggered as the fault. A lean condition (too much air, not enough fuel) can create misfires.This can be due to a clogged or misfiring fuel injector, faulty fuel pressure regulator, or even fuel pump. An ignition misfire as well can cause knock detection. A certified technician with the proper scan tools can read all sensor input and values to determine the cause of the repeat knock sensor fault code.

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. Jerking apon acceleration

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: Q: No start condition

Hello. If your issues began after you removed the turbo lines then the first thing I would do is go back and make sure that all of the hoses and lines were reinstalled correctly. Any sort of boost or vacuum...

Q: Rumbling sound from rear of vehicle

There can be multiple causes when dealing with a roaring or rumbling sound. A wheel bearing can cause a rumbling sound. When it comes to a rear end or differential it is important that all of the correct shims have...

Q: Why would my truck run better without the coolant temp sensor plugged in? 1990 Chevrolet K1500

Hello - coolant temperature sensors are variable resistor devices - the colder the coolant temperature, the greater the electrical resistance value reported to the engine computer. (The warmer the temperature, the less resistance.) An "open" condition, as in an incomplete...

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...
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.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.