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03-24-2012
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#1 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Spark knock at idle
I am getting spark knock at idle per the Tech one ....taking out 10 degrees....Flywheel?
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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03-24-2012
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#2 |
 Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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Re: Spark knock at idle
audible?
firing order goof or really bad gasoline? |
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03-24-2012
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#3 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Spark knock at idle
It picks up on the Tech 1, I really can only hear the flywheel slightly....
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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03-24-2012
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#4 |
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Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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Re: Spark knock at idle
before I replaced my injectors, my car would knock on the dual mass from time to time from an inj misfire (my dual mass has a little play in one direction, but is quiet until you turn of the engine and it decelerates to a stop).
If you can hear it constantly it must be knocking in both fore and aft movements??? does that make sense? are you in a position to drive it? |
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03-24-2012
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#5 |
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Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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Re: Spark knock at idle
you could disconnect the knock sensor temporarily and drive it w part throttle accel. if something is amiss, you can definitely hear the LT5 ping with the windows down.
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03-24-2012
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#6 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Spark knock at idle
I have a single mass flywheel...
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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03-24-2012
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#7 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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Re: Spark knock at idle
Lee,
What's the motor idling at? We can reduce the timing retard and bump the idle a bit. Also tune for the single mass. I wouldn't sweat it much.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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03-24-2012
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#8 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Spark knock at idle
idle is 750
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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03-25-2012
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#9 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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Re: Spark knock at idle
Quote:
We could raise that a bit. What about BLM(s) and spark timing at idle?
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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03-25-2012
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#10 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Spark knock at idle
left 160
right 155 -4 at idle
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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Linear Mode
