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Old 01-18-2007, 01:14 AM   #1
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Default knock retard woo'*:(

i was hoping that after my pcm and powerlog combo i would hvae 0 k/r but on a cold day can see as much as 3.5 degrees at 4500rpms and or about 8psi of boost

could this be a fuel pressure problem?

the car has 60k i dont know if the fuel filter has been changed or not
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Old 01-18-2007, 01:17 AM   #2
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Change your filter for sure, then check the fuel pressure, make sure its atleast at the minimum specs at all ranges, low pressure will cause KR at the top end.
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Old 01-18-2007, 01:20 AM   #3
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Quote:
Originally Posted by SSEimatt93
Change your filter for sure, then check the fuel pressure, make sure its atleast at the minimum specs at all ranges, low pressure will cause KR at the top end.
it also feels like the car is hesitating at high end too
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Old 01-18-2007, 01:23 AM   #4
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Yup, it will do that for sure..this is assuming your exhaust is flowing well enough...?
02 Sensor good?
These are all factors..any part of the car that meters air flow or exhaust is crucial when modding.
Hopefully its something simple...FPR maybe? All things to check when you do your inital fuel pressure test.
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Old 01-18-2007, 01:25 AM   #5
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yup ill try and do that tommorrow o2 sensor is new
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Old 01-18-2007, 01:27 AM   #6
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Excellent. Fueling was a big problem on my 1993 SSEi, it was way below spec, it sufferd at high end 3800rpms + in second gear when the engine was under load and needed to run that much more rich...At WOT the computer bypasses alot of its sensors and goes into full rich mode..sometimes not rich enough
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Old 01-18-2007, 01:51 AM   #7
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you got your injectors skewed for that powerlog right??
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Old 01-18-2007, 03:12 AM   #8
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Quote:
Originally Posted by 1993 SLE
you got your injectors skewed for that powerlog right??
nope

i know that i need to do that
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Old 01-18-2007, 03:31 AM   #9
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It could be part of the problem. If you're running lean on 3 cylinders, you might be knocking. Adding more fuel will combat KR, so having the fueling addressed might fix your issue. See what you can do about getting that fixed.
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Old 01-18-2007, 09:16 AM   #10
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KR this time of year for you will be devastating in warmer weather. You need to do it all. Skew, check fuel pressure, check your plugs, etc.
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