Q: Q: No check engine light

asked by on

Replaced one coil 2 years ago. No pick up n go from dead stop. Sluggish. At 45 Mph, acceleration is hesitant and must back down or over accelerate to pick up speed. No Check Engine light at all. Need to know how to find coil or injector that is bad. I have no diagnostic equipment.

My car has 110000 miles.
My car has an automatic transmission.

Considering your symptoms, I would suspect that your issue lies within the fuel or ignition system. Without diagnostic equipment, it would be best to have your vehicle inspected by a technician who does. Although you have no Check Engine Light, it is possible that the Check Engine Light may be burned out and that trouble codes could still be stored. I would first recommend having your vehicle scanned for trouble codes with an OBD2 scanner. This will help to determine which system or parts may be involved. If no codes exist, I would then recommend having the fuel pressure tested. If the fuel pressure is lower than factory specifications, the fuel pump or fuel filter may be close to the end of useful life. If the fuel pressure is within specification, I would then recommend having the ignition coils tested one by one with a spark tester to determine if any coils or spark plugs are malfunctioning. If you’d like assistance with these checks, consider YourMechanic, as a certified technician can perform the necessary tests to properly diagnose your acceleration issue.

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. Q: No check engine light

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: My car jerks when I accelerate

This may be a sign of a dirty or failing mass air flow sensor. The mass air flow sensor reads the air intake as it is mixed with fuel prior to being injected into the motor. When this fails, this...

Q: Trying to start the car yields only loud clicks but the battery and starter are good

Bench testing a starter motor, unloaded, can sometimes be unreliable. This is because there is usually a Bendix drive in a starter motor which if failed will be undetectable because the starter motor will still spin and draw normal current-...

Q: Broke vapor line on fuel pump assembly, could i still drive car without any issues?

You should not drive it this way. Did you know that gasoline vapor is more flammable than liquid gas? You should have it fixed before driving it to be on the safe side. If you need assistance with this, seek...

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...