C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

base timming

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Old Oct 23, 2002 | 05:40 AM
  #1  
jtfrog's Avatar
jtfrog
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From: Auburn ca
Default base timming

Can the base timing be set on an 86 vette. If so i understand it is in the throttle body drivers side. If the plug has never been removed can i asume the bas idle is ok.
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Old Oct 23, 2002 | 06:22 AM
  #2  
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gtsyellow
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From: down that one road next to that big tree
Default Re: base timming (jtfrog)

base timing is set by unplugging your spark advance, it's by the ecu under the hood on late C4's i have no idea where it is on early but i'm sure someone does. you then twist the distributor till the timing light flashes 6deg BTDC. timing is now set.
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Old Oct 24, 2002 | 02:08 AM
  #3  
vettl83's Avatar
vettl83
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Joined: Feb 2002
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From: Montrose Colorado
Default Re: base timming (gtsyellow)

Brown/tan wire coming out of the fire wall on the drivers side. Take care when unplugging it, as the connector does get brittle from under hood temps. 84 CF 91 ZR-1
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Old Oct 24, 2002 | 02:40 AM
  #4  
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65Z01
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From: SE NY
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Default Re: base timming (jtfrog)

Base idle is set with the screw on the left side of the TB; base ignition timing is set by openinng the EST connector in the blk/tan wire and adjusting the dist position.
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Old Oct 24, 2002 | 03:01 AM
  #5  
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ColinOpseth
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From: Los Angeles CA
Default Re: base timming (65Z01)

here are a couple of articles I wrote on setting ignition timing.. pardon the bad links, i still haven't finished updating my articles after my website upgrade..

Setting timing using a timing light (written for TPI vehicles): http://www.gmperformance.org/modules...artid=7&page=1

Installing a V8 distributor: http://www.gmperformance.org/modules...artid=8&page=1
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