Why is my engine knocking?

HD7

MEMBER
2002 PONTIAC GRAND AM
15,500 MILES

Changed my Oil/Filter and plugs in my 2002 Grand AM SE 4 Cyl. 2.2 and now my engine is Knocking. Why is this?

Thank you,

Tim

Monday, September 19th, 2011 AT 12:10 AM

3 Replies

JACOBANDNICKOLAS

MECHANIC
108,133 POSTS

Tim, are you sure the plug wires are on the correct plugs? Also, is the oil light on?

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Monday, September 19th, 2011 AT 1:06 AM

HD7

MEMBER
2 POSTS

Yes, there is only one way for the plugs/plug wires to go in. Yes the Oil light is on which I found odd as well. If you lay your hand on the intake, you can feel the knock.

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Monday, September 19th, 2011 AT 1:32 AM

JACOBANDNICKOLAS

MECHANIC
108,133 POSTS

If the light is on, the oil pressure is extremely low and causing the noise. It may have damaged a rod or main bearing at this point. To confirm oil pressure, rent a mechanical gauge at a parts store. It will screw into where the electric oil sending unit is located. From that you will know how much pressure you really have. As for what caused it, make sure the oil filter you have is correct.

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Wednesday, September 21st, 2011 AT 4:15 AM