Close
Car Questions
RepairPal is your advocate for car care advice and guidance

Why do i have a loud knocking from the engine when i accelerate?

(1999 Pontiac Grand Am)
in Cleveland, OH on May 16, 2016
i was getting on the freeway yesterday and i started hearing knocking in the front of the car. my grandpa looked at it i told him that my oil light has been on for a while but i was told it was okay cause its an old car. he checked the oil an i had barely anything. he put oil in it but only 2 quarts and when i accelerate it still makes a loud knocking in my engine. what could this be?
Displaying 1 answer & 0 comments
Popular Answer
on May 16, 2016
It's likely a failed 'connecting rod bearing' if it only knocks when accelerating .. Car savvy person or mechanic can remove plug wires 'one at a time' while engine is running .. If knocking gets quieter or goes away .. Rod bearing failure is confirmed .. on that particular cylinder .. Repair requires engine removal for disassembly to install a crankshaft kit or the engine may need to be replaced... Oil pan removal for bearing inspection is the best way to check the extent of damage .. Good luck with it!
Sign in to reply
Get a repair estimate
RepairPal estimates are guaranteed at over 2,000 quality certified locations nationwide.
Or interested in getting a repair? Find a Shop

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
What tools would i need to change my antifreeze. because on the internet it say's i need to fit 3/8 drain hose to my ...
How much does it cost to do a transmission fluid change?
Didn't find what you were looking for?