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02-07-2012, 08:07 PM
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#1
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Join Date: Mar 2011
Location: Morris County
Posts: 1,033
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false knock??
I'm trying to track down the cause of spark retard-15 degrees at times...
Noticed I'm getting up to 4 degrees of retard in neutral while lightly revving motor with long and short fuel trims right at 128 (Not running lean)Does that mean its a false knock or possibly a bad knock sensor?
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94 Trans am 25th anniversary
86 Buick Regal T-type
73 camaro 454/T56 work in progress.
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02-07-2012, 08:08 PM
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#2
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,896
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What kind of car? Mods done to it? Last tune up? Ect.
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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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02-07-2012, 08:10 PM
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#3
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Mod list?
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02-07-2012, 08:12 PM
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#4
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Join Date: Mar 2011
Location: Morris County
Posts: 1,033
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94 TA 102,000 miles....A4. bone stock except SLP CAI...
Just did:
ECT sensor
IAC valve
EGR Valve
EGR solenoid valve and vacuum lines
O2 sensors.
Fuel filter
Cleaned MAF
Replaced PCV and CCV hoses
Havent done plugs/wires yet, probably due
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94 Trans am 25th anniversary
86 Buick Regal T-type
73 camaro 454/T56 work in progress.
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02-07-2012, 08:15 PM
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#5
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Have you checked the fuel pressure?
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02-07-2012, 08:17 PM
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#6
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Join Date: Mar 2011
Location: Morris County
Posts: 1,033
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__________________
94 Trans am 25th anniversary
86 Buick Regal T-type
73 camaro 454/T56 work in progress.
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02-07-2012, 08:17 PM
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#7
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Join Date: Mar 2011
Location: Morris County
Posts: 1,033
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Yes fuel pressure 40 at idle and 45 at WOT going off memory
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94 Trans am 25th anniversary
86 Buick Regal T-type
73 camaro 454/T56 work in progress.
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02-07-2012, 10:04 PM
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#8
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Join Date: Jul 2009
Location: barnegat nj
Posts: 1,340
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I have heard in the past that lt1 knocks were sensitive and guys ran the lt4 knocks to solve the problem. But, I may be wrong, I really don't concentrate on retaining boat anchor information...lol
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Quote:
Originally Posted by SRGN
I never pulled into the staging beams at the track and saw a dyno in the other lane.
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South Jersey Racecraft
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02-07-2012, 10:05 PM
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#9
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,896
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Quote:
Originally Posted by S.J.SLEEPER
I have heard in the past that lt1 knocks were sensitive and guys ran the lt4 knocks to solve the problem. But, I may be wrong, I really don't concentrate on retaining boat anchor information...lol
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Meh.
If he had roller rockers or even long tube headers maybe. But stock sensor and module should be 100% fine.
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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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02-08-2012, 05:46 AM
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#10
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Join Date: Mar 2011
Location: Morris County
Posts: 1,033
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Couldnt the stock sensor fail over time??
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94 Trans am 25th anniversary
86 Buick Regal T-type
73 camaro 454/T56 work in progress.
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02-08-2012, 07:22 PM
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#11
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Join Date: Mar 2011
Location: Morris County
Posts: 1,033
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I just turned off the sun and ran car in dark. When I revved it I could see the spark plug wires arcing in a couple spots so I guess thats next on my list and what is causing my problems. Im going to buy NGK TR55 plugs . Anybody have suggestions on wire brand/size....How bout gapping of plugs.... .045?
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94 Trans am 25th anniversary
86 Buick Regal T-type
73 camaro 454/T56 work in progress.
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02-08-2012, 07:23 PM
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#12
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Msd's and yeah that's fine.
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02-08-2012, 07:28 PM
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#13
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Join Date: Mar 2011
Location: Morris County
Posts: 1,033
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Cool thanks
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94 Trans am 25th anniversary
86 Buick Regal T-type
73 camaro 454/T56 work in progress.
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02-10-2012, 09:42 PM
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#14
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Join Date: Jul 2009
Location: Bridgeport NJ
Posts: 165
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Gapped at .050".
What octane fuel are you using? Might be a good idea to use some 100+ octane and see how that affects your knock readings. If it goes away then the knock is real. If it stays, the knock is false.
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02-11-2012, 01:36 PM
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#15
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
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.050 is stock and way big.
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02-11-2012, 01:49 PM
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#16
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Join Date: Mar 2011
Location: Morris County
Posts: 1,033
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I'm gonna do .45 .. I think the NGk TR55's are pre gapped .59...Ram Air I'm using 93 now. After I do plugs and wires this week, I'll see how it runs but I'm pretty sure thats where my prob is coming from.
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94 Trans am 25th anniversary
86 Buick Regal T-type
73 camaro 454/T56 work in progress.
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02-12-2012, 11:44 AM
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#17
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Join Date: Jul 2009
Location: Bridgeport NJ
Posts: 165
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His car is stock...how is .050" too big?  Makes no sense.
I ran mine gapped at .050" bolt-on only for 5 years running well into the 12s. Nothing wrong with .050".
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02-12-2012, 12:28 PM
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#18
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Stock coil is questionable at high rpm. Might as well help it out with narrowing the gap it has to jump.
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02-12-2012, 12:46 PM
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#19
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Join Date: Mar 2011
Location: Morris County
Posts: 1,033
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Bolt on LT-1 run 12's?
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94 Trans am 25th anniversary
86 Buick Regal T-type
73 camaro 454/T56 work in progress.
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02-14-2012, 11:28 AM
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#20
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Join Date: Jul 2009
Location: Bridgeport NJ
Posts: 165
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Quote:
Originally Posted by grazi
Bolt on LT-1 run 12's?
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Sure. There's even a handful in the 11s. Good parts, tuning, and suspension and 12s are easily attainable.
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02-14-2012, 03:21 PM
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#21
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13 sec club
Join Date: Oct 2011
Location: Mays Landing, NJ
Posts: 245
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had the same problem a couple of years ago when my dad owned the car.
did the plugs, wires, upgraded the opti while we were in there and did the lt4 knock sensor and module. the prob went away...cant specifically say which part did it for me but sounds like ur on the right path
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1994 Z28...SOLD
1994 Honda Civic LX 1.5L.....not to be riced
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02-14-2012, 03:31 PM
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#22
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Join Date: Mar 2011
Location: Morris County
Posts: 1,033
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Thats good 2 hear. Thanks. Stupid question-when you guys replace the knock sensor, if your fast enough, could you theoretically not drain coolant and just work fast and let some spill and replace what you spilt? I did that with my ECT sensor and only lost a little coolant.
__________________
94 Trans am 25th anniversary
86 Buick Regal T-type
73 camaro 454/T56 work in progress.
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02-14-2012, 04:57 PM
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#23
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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In theory, I would do that with a clean pan in the "drop" zone.
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02-14-2012, 06:37 PM
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#24
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Join Date: Mar 2011
Location: Morris County
Posts: 1,033
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AKA just do it in the grass?
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94 Trans am 25th anniversary
86 Buick Regal T-type
73 camaro 454/T56 work in progress.
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02-14-2012, 06:41 PM
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#25
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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In the "grass", ya.
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