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03-25-2012
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#11 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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Re: Spark knock at idle
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Need to re-tune that. Call me.
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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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04-02-2012
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#12 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Spark knock at idle
Changed the fuel filter, no change....but then I noticed that my Tech 1 has a BLM reset button, that sets BLM counts back to 128 and removes the "learned" counts....
Will see what happens, still show knock Put some Fuel Inj cleaner in also...I did notive that timing is at 1-2 degrees vs the -4 to 8 it was at... I also noted that on decel timing drops to -10 Tech 1 should have a label: This is not a toy..... 
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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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04-02-2012
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#13 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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Re: Spark knock at idle
Quote:
Decel does pull timing. If you noticed a diff after fuel filter, how about the quality of the fuel in the tank? Has it been sitting around for a while? Do you notice WHEN the knock occurs? The scan tool will detect knock at start up and shut down but those should be of no concern. I would reset BLMs and Spark Counts w Tech 1 then drive around a bit. See what happens. You should datalog with a scantool so we could see what is happening when.
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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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04-22-2012
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#14 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Spark knock at idle
beginning to think its the knock sensor filter/elec spark control....unplugged the knock sensor and still getting 10 degrees of timing retard at idle, and when I floor the car the timing drops to 6-8 degrees......surprised the car is this fast
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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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04-22-2012
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#15 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Spark knock at idle
FSM says that if the knock is present without a code 43 ESC is bad, I have an internal engine problem or the wire is picking up a false knock.
Anyone know who sells the ESC module?
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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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04-22-2012
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#16 |
 
Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,680
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Re: Spark knock at idle
Get new knock sensor,done.
Pete
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'91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage |
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04-22-2012
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#17 |
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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 unplugged the sensor and the knock was still there..per FSM I believe that points to the ESC...
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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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04-22-2012
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#18 |
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Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,680
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Re: Spark knock at idle
If you don't have a short.
Change knock sensor,it's cheap and will save you time and headache. Just trust me on this. Pete By the way the 1990 knock sensor is different.
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'91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage Last edited by Pete; 04-22-2012 at 11:18 PM. |
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Linear Mode
