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Join Date: Nov 2002
Location: venice ca
Posts: 928
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Knocking under acceleration, help
when hot and under pretty hard acceleration my car will knock.
valve knock. timing is set to stock. what should i try???
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Jason 81 SC 97 328is 87 Jeep Comanche (RIP) |
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04-27-2003, 09:28 AM
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one of gods prototypes
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what octane fuel are you using?
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Brought to you by Carl's Jr. |
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04-27-2003, 10:36 AM
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Formerly bb80sc
Join Date: Aug 2001
Location: Hollywood Beach, CA
Posts: 4,361
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Have you checked your head studs lately? Have you checked for exhaust leaks? Inspected your timing chain/tensioners lately? If your timing is set to 5 degrees BTDC, I do not see how it could be detonation. Many of us run at 35 degrees BTDC max advance at 6K RPMS, which is approx 10-12 degrees at idle. with no detonation issues...
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Cheers -Brad 2015 Cayman GTS 2015 4Runner Limited |
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04-27-2003, 11:08 AM
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Location: venice ca
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im using super. just did a major service, no headstuds broken.
checked timing. im gonna double check the timing and advance function to be sure. thanks
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Jason 81 SC 97 328is 87 Jeep Comanche (RIP) |
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04-27-2003, 12:56 PM
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Location: Shreveport, La.
Posts: 1,710
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Could be carbon buildup. Try a bottle of Techron.
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Robert Stoll 83 911 SC 83 944 |
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04-27-2003, 02:19 PM
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thats a good idea, ill try that
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Jason 81 SC 97 328is 87 Jeep Comanche (RIP) |
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04-27-2003, 02:22 PM
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Location: Shreveport, La.
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It did the trick for me. I bought my 83 about 2.5 yrs ago. It did the very same thing. Hot, under hard accleration, knocked. I ran a couple bottles of Techron and no more knock. Also treat it to a bottle of Marvel Mystery Oil in the tank every now and then.
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Robert Stoll 83 911 SC 83 944 |
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04-27-2003, 02:25 PM
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Senior Member
Join Date: Nov 2000
Location: Great NorthWest
Posts: 3,944
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Did you move to a synthetic oil recently?
John
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'78 Targa in Minerva Blue |
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04-27-2003, 02:31 PM
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Location: venice ca
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nope. i use castrol 20/50.
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Jason 81 SC 97 328is 87 Jeep Comanche (RIP) |
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04-27-2003, 02:42 PM
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Formerly bb80sc
Join Date: Aug 2001
Location: Hollywood Beach, CA
Posts: 4,361
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Quote:
Make sure you have Castrol on hand....you'll need to do an oil change after running the Techron thru 
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Cheers -Brad 2015 Cayman GTS 2015 4Runner Limited |
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04-27-2003, 03:18 PM
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Join Date: Feb 2002
Location: Montana
Posts: 715
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One thing to check is total advance. On my '78 SC it would ping on accleration, the timing was good at idle. However I got something like 45 degrees advance at 4500 rpm. After taking out the distributor I found one of the advance springs had come off. After putting the spring back on (and a good cleaning) my pinging stoped.
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1982 930, K-27, BL adj. WUR, Rarlyl8 Headers and Hooligan muffler, PK CDI, 22 and 30mm torsion bars, poly bronze bushings 30mm raised spindles and custom valved Bilstein shocks (by Elephant Racing), monoballs front and rear (by Rennline), Alton 17" Fuchs, Fred Cook fuse panel |
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04-27-2003, 03:18 PM
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1985 Porsche 911 carrera targa 3.2
