Q: Check engine light on, engine knocking, loss of power, and coolant leaking.

asked by on

Hi,

My car recently had its engine replaced because oil had leaked out. Everything had been running smoothly for about three weeks now.

Today, after parking my car, the check engine light came on. I stopped the car. The oil was full, but the coolant was empty. Not having coolant, I drove the car for less than a mile when I remembered a friend of mine left spare coolant in my car. I put this in but noticed that the temperature gauge had already gone to the halfway point.

I drove the car 4 miles to a mandatory meeting and parked. Afterwards, I drove uphill 3 miles. I started to hear a quiet knocking noise and loss of power. I decided that adding the coolant wasn't enough so I drove the car straight home.

Later, I noticed the coolant leaking from under the car but the coolant reservoir was still full.

My main concern is, did I ruin the engine again?? What other issues could explain this?

My car has 90000 miles.
My car has an automatic transmission.

Hi there. Grab a flashlight and look under the vehicle for where the coolant leak is coming from. Either there is a gasket, hose, or freeze plug that is leaking causing the coolant to leak or the engine has cracked. The knocking noise is from the engine getting too hot and causing a detonation sound. If there is a crack in the block, then it could be from a piston rod that broke off. The loss of power is when the engine had not enough coolant to operate properly and caused the engine to overheat and not burn the fuel properly. If you need further assistance with your engine having a coolant leak, then seek out a professional, such as one from Your Mechanic, to help you.

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. Check engine light on, engine knocking, loss of power, and coolant leaking.

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: Slow leak on left side of the radiator, no heat

The radiator leaking coolant would be the the most important leak to repair first. The thermostat can be checked by watching the temperature on the gauge to see if the temperature gets up near the middle of the gauge and...

Q: Knocking sound from car while driving straight and turning.

There are several reasons that may be causing a strong knocking sound from the driver’s side front wheel and this sound is likely attributed to an issue with the brakes, steering, and suspension. Struts/Strut Mounts - The suspension strut...

Q: Okay so basically my car shakes and vibrates a lot while idle or at a stop light. And then when I go above 65 rides rough

The rough idle may be caused by a variety of things, but this happens most commonly when the mass air flow sensor or the idle air control module have failed. The mass air flow sensor is responsible for monitoring the...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...
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...