2002 Pontiac Sunfire

Tiny
GILLISJ4
  • MEMBER
  • 2002 PONTIAC SUNFIRE
  • 4 CYL
  • FWD
  • MANUAL
  • 106,000 MILES
My 2002 Sunfire had a slight (only audible on occasion and only in R or 1st gear) knocking noise when I bought it 2 months ago, that I assumed was an exhaust leak. However, this evening while driving up a hill on the highway my car started to lose power, and would not pick up speed, even with my foot buried to the floor in 5th gear. Once I made it to the top of the hill everything seemed to be fine. About 20 minutes, after dropping a friend off and while backing out of his driveway I noticed that my engine was knocking very loudly, almost a metal on metal sound as soon as my RPM exceeded 2000 (I'm going to assume the engine was knocking before hand but neither of us heard anything because we had the radio on and up. The knocking is similar to the one I assumed to be an exhaust leak, only stronger, louder and MUCH more noticeable. The sound is definitely not an exhaust leak and isn't caused by any visible vibrations upon quick inspection. The sound seems to be coming from within my engine, could this be a camshaft problem? Or if not, any insight into what this could be? Thanks, Justin
Do you
have the same problem?
Yes
No
Wednesday, April 29th, 2009 AT 12:50 AM

3 Replies

Tiny
2CARPRO JACK
  • EXPERT
If it was a cam problem the noise would be higher pitched and fairly fast in tempo. Sounds like yours is more deep and slow which would point towards the bottom end of the engine (crankshaft, rods). I would definitly have it looked at before too much engine damage occurs
Was this
answer
helpful?
Yes
No
Wednesday, April 29th, 2009 AT 7:29 AM
Tiny
GILLISJ4
  • MEMBER
When I went out this morning to show a friend the noise, and see if he had any idea the noise wasn't nearly as bad as last night. I'm assuming that it was because the engine wasn't warmed up yet. Could that also indicate crankshaft? Also when we were looking around, he noticed that my spark plugs were extremely dirty; he had to take a screwdriver and loosen the dirt and grime built up around them before he could fir the ratchet in to loosen them. He thinks that this may have something to do with the noise as well, but to me it sounds like something within the engine is blown. Could dirty plugs be causing this?
Was this
answer
helpful?
Yes
No
Wednesday, April 29th, 2009 AT 11:38 AM
Tiny
2CARPRO JACK
  • EXPERT
Highly unlikely. Carbon in the cylinders (tops of pistons)would be the only relation to the spark plugs that could do what you describe
Was this
answer
helpful?
Yes
No
Wednesday, April 29th, 2009 AT 2:33 PM

Please login or register to post a reply.

Sponsored links