Why am I getting knock retard@WOT with a bone stock LS1 Z28?!
06-30-2006, 12:17 PM
#21
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Originally Posted by MiaSSmaro98
does the product bring directions or can u guys give me some like step by step?
It will smoke like crazy at first, dont worry about that, just get out the neighborhood quick, your neighbors will hate you for smoking up the block.
06-30-2006, 01:27 PM
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okay, 98 with 55k on it and have the smae issue, with mgk's as well. That's the only thing we have in common. I have had the problem for about two years. That's th elast time i had the auto tap on it. Still doing it here too?
06-30-2006, 01:49 PM
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have you ever considered you both may have just a simple bad knock sensor? I know one year was really sensitive, if you go this far, then you can really get the carbon out of the intake, cause it is off the car.
06-30-2006, 02:20 PM
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Originally Posted by Luna
Don't you have to change the plugs and oil after you seafoam or is that only if you do it a certain way?
06-30-2006, 02:22 PM
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Originally Posted by MiaSSmaro98
thats it sounds easy.how about the one u pour in the TB?remember my 98 has the pcv going into th in mani so it must be nasty in there.
06-30-2006, 03:32 PM
#31
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here's a quick writeup on seafoam for an LT1 Z28. same instructions apply to LS1's.
http://members.nuvox.net/~on.roz/cars/z28/seafoam.html
use it if you want, be my guest 
http://members.nuvox.net/~on.roz/cars/z28/seafoam.html
Originally Posted by FSUNole17
that is sig material if i have ever seen it
06-30-2006, 03:33 PM
#32
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Originally Posted by brad8266
I think we need a sticky dedicated to seafoam here since there have been tons of threads about seafoam too.
06-30-2006, 06:08 PM
#34
Originally Posted by daryl2cb@yahoo.com
have you ever considered you both may have just a simple bad knock sensor? I know one year was really sensitive, if you go this far, then you can really get the carbon out of the intake, cause it is off the car.
06-30-2006, 06:26 PM
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Originally Posted by jimmyblue
Getting engine temp under control is definitely a key
step. Just fan settings, to keep it from swinging up
to 226F sitting still and going to hell from there.
The fuel filter will slowly degrade your high-flow fuel
pressure as it crusts up, without giving much sign at
the lower, closed-loop range.
Single injector delivery problems likewise will show
little or no indication at lower flows, but limit the
shot into one cylinder as sediment obstructs the
screen. Factory misfire settings mask high-RPM,
WOT misfires so you don't get a good indication.
Some tools let you do injector balance tests which
might help you determine if this is going on (used
to be, you'd just pull the plugs but pulling some of
the plugs kind of sucks, here).
step. Just fan settings, to keep it from swinging up
to 226F sitting still and going to hell from there.
The fuel filter will slowly degrade your high-flow fuel
pressure as it crusts up, without giving much sign at
the lower, closed-loop range.
Single injector delivery problems likewise will show
little or no indication at lower flows, but limit the
shot into one cylinder as sediment obstructs the
screen. Factory misfire settings mask high-RPM,
WOT misfires so you don't get a good indication.
Some tools let you do injector balance tests which
might help you determine if this is going on (used
to be, you'd just pull the plugs but pulling some of
the plugs kind of sucks, here).
Last edited by damon_Z; 06-30-2006 at 06:34 PM.
06-30-2006, 06:32 PM
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Originally Posted by ChocoTaco369
i agree. sounds like carbon buildup.
seafoam is the engine's answer to KY jelly. it makes an already great thing even better.
seafoam is the engine's answer to KY jelly. it makes an already great thing even better.
06-30-2006, 06:40 PM
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Originally Posted by slow trap
when i was stock on very warm days i would get around 1.5-2 * knock and that was when it had around 10-15 k .
06-30-2006, 07:15 PM
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If you can't find Seafoam I highly recommend GM Top Engine Cleaner. You can pour it in the brake booster but I like using the line going to the TB. It'll get the intake much better than the booster.
06-30-2006, 09:43 PM
#39
Tech Resident
for all those interested, i have lived up to my word. i have posted an official guide to seafoaming your car in the general maintence & repair section. check it out if you will. hopefully a mod will sticky it. seafoam poses a lot of questions on this site.
