Knocking while Idling and sluggish at slow speeds.

Tiny
SIERRACOCOBABYY
  • MEMBER
  • 1996 INFINITI I30
  • 120,000 MILES
While idling my i30 knocks, I don't know cars very well so sorry if my explanation is hard to understand. When Idling it knocks real hard, and the RPM meter goes down with each knock. At fast speeds it is fine. I already had igniton coils replaced, and spark plugs. Then got a code to replace the O2 sensor (upstream), replaced that. Then my car stalled on me, and wouldnt start, check engine light was on. Forgot to clear the codes. Did that, then got another code for a coolant temp sensor. Replaced that, and the knocking actually stopped for 2 days. Now its BACK. Can anyone shed any light on what the hell is wrong with it? The knock sensor? The fuel filter, idle control valve! I'm going crazy, and keep getting different codes and the problem is STILL there. Please help!
Saturday, November 9th, 2013 AT 9:40 AM

5 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have a local pro listen to the noise, hard for us as we can't really hear it. You might spray water on belt if noise dissaptes then replace belt and tensioner.
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Saturday, November 9th, 2013 AT 10:12 AM
Tiny
SIERRACOCOBABYY
  • MEMBER
  • 3 POSTS
Hmac300, it doesn't really make a noise. Knocking is the wrong word I guess, it is stuttering, rough idling.
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Saturday, November 9th, 2013 AT 11:11 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check fuelpressure with a gauge, auto parts rent them. Clean throttle plate with choke cleaner on both sides an diac hole.
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Saturday, November 9th, 2013 AT 11:12 AM
Tiny
SIERRACOCOBABYY
  • MEMBER
  • 3 POSTS
Okay, I'll try all of that. Is it possible that all of these things need to be replaced and that is why I keep getting different codes? Its frusterating that I get one code, fix it, and then the problem is still there and I scan it, and get a completely different code!
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Saturday, November 9th, 2013 AT 11:22 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have your battery tested for condition including load test. Auto parts do that for free. As well as tire stores
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Saturday, November 9th, 2013 AT 11:35 AM

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