 Engine Rattle |
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| CSoso |
 Oct 19 2015, 06:59 PM
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#1
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Over-analyzing one mistake at a time...  Group: Members Posts: 18 Joined: 29-August 15 From: Jackson, Michigan Member No.: 19,114 Region Association: Upper MidWest  |
Hi All,
I have a 73 base 914 with a 1.7L FI engine. When I accelerate hard, or even medium, I hear a rattling sound from the engine. Otherwise it starts great, runs great, no oil leaks or burning oil, etc. It has better power (according to my calibrated seat of the pants) than my old 1.7L dual Weber car. There are unknown miles on the engine as it was replaced with a "good used engine" 3 years ago by the original owner (stuck wot blew original engine). Engine #'s are correct for a non-smog 73 1.7L engine. Any ideas on cause and fix are appreciated! |
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| somd914 |
Oct 19 2015, 07:08 PM
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#2
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Member Group: Members Posts: 1,171 Joined: 21-February 11 From: Southern Maryland Member No.: 12,741 Region Association: MidAtlantic Region |
A few typical items to check as a starters:
- Heat plumbing under the car: make sure none the elbows, flapper boxes, j-tubes, etc are tight and not rattling. - Make sure heat exchangers and muffler are secure and not rattling such as with internal rust - Alternator belt: is it tight - Fan: make sure no foreign objects are floating around the shroud Does it make the noise if you rev it up while sitting or just under load while accelerating? |
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| CSoso |
Oct 19 2015, 07:19 PM
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#3
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Over-analyzing one mistake at a time... Group: Members Posts: 18 Joined: 29-August 15 From: Jackson, Michigan Member No.: 19,114 Region Association: Upper MidWest |
Thanks! I will check those items. It only does it while under load. Could it be detonation? Thanks again!
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| cary |
Oct 21 2015, 07:10 AM
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#4
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Advanced Member Group: Members Posts: 3,900 Joined: 26-January 04 From: Sherwood Oregon Member No.: 1,608 Region Association: Pacific Northwest 
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Check that the muffler isn't touching the heat shield or the rear valance after everything gets warmed up.
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| '73-914kid |
Oct 21 2015, 11:11 AM
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#5
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Senior Member Group: Members Posts: 1,473 Joined: 1-November 08 From: Vista, CA Member No.: 9,714 Region Association: Southern California  |
QUOTE(CSoso @ Oct 19 2015, 06:19 PM)  Thanks! I will check those items. It only does it while under load. Could it be detonation? Thanks again! Sound like gravel in a coffee can? That would be pinging... |
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| Bartlett 914 |
Oct 21 2015, 12:23 PM
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#6
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Advanced Member Group: Members Posts: 2,216 Joined: 30-August 05 From: South Elgin IL Member No.: 4,707 Region Association: Upper MidWest |
it could be a rod knock
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| dirk9141973 |
Oct 21 2015, 06:57 PM
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#7
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Unregistered |
(IMG:style_emoticons/default/confused24.gif) I have a ping, rod knock under load like climbing a hill ?? is that bad? if I lift just a little goes away
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| wndsnd |
Oct 21 2015, 06:59 PM
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#8
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You wanted a horse, but got a goat. Nobody wants a goat.... Group: Members Posts: 2,861 Joined: 12-February 12 From: North Shore, MA Member No.: 14,124 Region Association: North East States |
Sounds like pinging. Check timing.
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