knock retard
07-30-2010, 07:01 PM
#3
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hmm on a stock 02 well stock as far as i know it has no cats and smells rich at idle i have purchased hptuners but have'nt had alot of time to read alot of material,I plan on getting a wideband very soon not sure which one to get tho.. ill see if i can add some timing on it. whats a good starting point for a ls1 stock heads cam internals 24degrees?
07-30-2010, 08:27 PM
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I would begin with listening. Excess valvetrain clatter, etc.
Excess acoustic activity that's crank-synchronous and hits
the detect window could be a false knock maker. Exhaust
banging can do it also.
Then I'd look for misfires as an indication that you have
a lean cylinder. Stock tune should be way too fat to ping.
But a fuel shortfall, single or global, could change all that.
Fuel filter is another good thing to just get overwith, you
certainly do not want to tune for the pressure drop of an
old crusty one. Check WOT fuel pressure, they all fade but
if you see less than 52# that's abnormal.
If you run an oiled air filter, clean the MAF. Hell, clean it
anyway (spray only).
Excess acoustic activity that's crank-synchronous and hits
the detect window could be a false knock maker. Exhaust
banging can do it also.
Then I'd look for misfires as an indication that you have
a lean cylinder. Stock tune should be way too fat to ping.
But a fuel shortfall, single or global, could change all that.
Fuel filter is another good thing to just get overwith, you
certainly do not want to tune for the pressure drop of an
old crusty one. Check WOT fuel pressure, they all fade but
if you see less than 52# that's abnormal.
If you run an oiled air filter, clean the MAF. Hell, clean it
anyway (spray only).
07-30-2010, 11:22 PM
#5
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i just had the fuel filter done last oil change and can any of that be done with hptuners or do i need certain tools sorry for my ignorance i have a run with hptuners on the laptop ill see if i can load it on here...
07-31-2010, 04:25 AM
#7
Tryn to find out Y I was having the same issue..Hopefully the culprit ..was determined that I had very worn motor mounts, causing y pipe to slap the floor boards, causing a false knock! Just Replaced ALL (Tranny also) MOUNTS WITH POLY MOUNTS!..We will C now how it goes..
Last edited by z28241; 07-31-2010 at 05:33 AM.
