 What's that noise? |
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| ezbngreen914 |
 Apr 12 2011, 10:45 PM
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#1
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Member  Group: Members Posts: 441 Joined: 11-December 10 From: Sautee, GA Member No.: 12,472 Region Association: South East States  |
Just wandered if anyone wanted to help me out and play “What’s that noise”. I have a stock 73 1.7 with FI. Under hard acceleration after getting back on the gas after changing gears, the engine makes a noise that sounds like something between flicking water on a hot stove and a piece of aluminum foil shaking around in a tin can. Thanks in advance for all your help. I’ve been having a great time driving this thing around for the last 4 months and want to keep it as healthy as possible.
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| Dave_Darling |
Apr 13 2011, 01:19 AM
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#2
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914 Idiot Group: Members Posts: 14,990 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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Could it also be described as a "spitting rattle" sound? That was how I described the sound of pinging (detonation) in my old 1.8 a ways back. It went on for quite a while before blowing a hole in a piston.
--DD |
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| ezbngreen914 |
Apr 13 2011, 12:59 PM
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#3
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Member Group: Members Posts: 441 Joined: 11-December 10 From: Sautee, GA Member No.: 12,472 Region Association: South East States |
I think that’s the noise. And from what I've been seeing online it’s happening at the right time to be pinging (under load or acceleration). I'm running 87 octane gas (the less than 10% ethanol crap, can't find any ethanol free in the area). Would bumping up the octane help? Any additives? If I have to rebuild an engine I’m hoping to at least put it off tell wintertime…several years from now.
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| luskesq |
Apr 13 2011, 01:22 PM
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#4
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Member Group: Members Posts: 276 Joined: 24-October 10 From: Fresno, CA Member No.: 12,303 Region Association: Central California |
QUOTE(ezbngreen914 @ Apr 13 2011, 11:59 AM)  I think that’s the noise. And from what I've been seeing online it’s happening at the right time to be pinging (under load or acceleration). I'm running 87 octane gas (the less than 10% ethanol crap, can't find any ethanol free in the area). Would bumping up the octane help? Any additives? If I have to rebuild an engine I’m hoping to at least put it off tell wintertime…several years from now. You may want to double check your timing. Sounds like it may be off. keith |
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| Dave_Darling |
Apr 13 2011, 04:59 PM
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#5
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914 Idiot Group: Members Posts: 14,990 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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Can't hurt to check the timing. Try running high-octane fuel in it, too. If the timing is OK and the high-test stuff prevents the problem, figure you have high compression or carbon deposits and keep running the more expensive fuel.
--DD |
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| ezbngreen914 |
Apr 15 2011, 01:13 AM
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#6
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Member Group: Members Posts: 441 Joined: 11-December 10 From: Sautee, GA Member No.: 12,472 Region Association: South East States |
A couple of gallons of 93 octane ethanol-free fuel and half a bottle of Lucus injector cleaner/top end lube, and it seems like the pinging sound is gone. I'll be happy to spend some time tomorrow just to make sure though. Thanks everyone for the suggestions!
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