Re: Metallic rattling noise while accelerating -- Honda Accord Message Board

[ Show ]

Support VoyForums

[ Shrink ]

VoyForums Announcement: Programming and providing support for this service has been a labor of love since 1997. We are one of the few services online who values our users' privacy, and have never sold your information. We have even fought hard to defend your privacy in legal cases; however, we've done it with almost no financial support -- paying out of pocket to continue providing the service. Due to the issues imposed on us by advertisers, we also stopped hosting most ads on the forums many years ago. We hope you appreciate our efforts.

Show your support by donating any amount. (Note: We are still technically a for-profit company, so your contribution is not tax-deductible.) PayPal Acct: Feedback:

Donate to VoyForums (PayPal):

[ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, [3], 4, 5 ]

Subject: Re: Metallic rattling noise while accelerating

Author:
Glen

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Date Posted: 21:08:51 09/02/04 Thu
Author Host/IP: host-69-95-126-90.cwon.choiceone.net/69.95.126.90
In reply to: ShortyBP 's message, "Metallic rattling noise while accelerating" on 07:50:42 09/01/04 Wed

I'm betting that you are hearing pre-ignition or "spark knock". This is caused when the the air/fuel mixture ignites due to a hot spot in the combustion chamber instead of the spark plug. When the flame front from the two different places hit, you get a knocking noise. This can cause damage in the cylinder. It is more prevalent in high load conditions, like accelerating uphill. Many newer engines have spark knock sensors that "listen" for a certain frequency and retard the ignition timing to eliminate knocking. I'm not sure that your year has a spark knock sensor.

Pre-ignition can be caused by incorrect ignition timing, excessive deposits in the combustion chamber, or low octance fuel. Finally, the incorrect amount of EGR, exhaust gas recirculation, can cause knocking.

I'd verify that the ignition timing is correct and that the EGR system has not been disabled or damaged. Also check if the knocking goes away with higher octane fuel.

Hope this helps...Glen

[ Next Thread | Previous Thread | Next Message | Previous Message ]

Replies:

Subject	Author	Date
Thanks Glen, I'll try following up on that.	ShortyBP	08:31:07 09/03/04 Fri