Running lower timing then tables show???
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From: Glen Burnie, Md
Running lower timing then tables show??? Reporting 18-20 degrees timing, starting with a stock 99-00 file. Following the MAF/RPM it should have been looking up between 26-32 degrees timing. Wasnt showing knock on 4 or the 5 runs, and it showed same timing regadless.
If you throw a P0327 or the other knock sensor code I know it will read in that table, and the car had thrown that code two times before over a long time period though. Cleared the codes, and they havent been back since, but still reporting timing in the pits.
If you throw a P0327 or the other knock sensor code I know it will read in that table, and the car had thrown that code two times before over a long time period though. Cleared the codes, and they havent been back since, but still reporting timing in the pits.
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Flashing the PCM with Edit should put you back to 100% use (factor) of the High Octane Table. Go to Eng Cal -> Ignition -> Knock learn -> Min RPM. Set Min RPM to a value you'll not see- say 6800 RPM for example. This will hold it in the high Octane Table......scan and check your values for Spark Advance.
You might want to increase your rate of decay (Knock), also. Eng Cal-> Ignition-> Knock Retard -> Decay vs RPM - set it @ 128, all cells. FWIW.
joel
You might want to increase your rate of decay (Knock), also. Eng Cal-> Ignition-> Knock Retard -> Decay vs RPM - set it @ 128, all cells. FWIW.
joel
Last edited by binksz06; Jan 13, 2004 at 11:50 PM. Reason: afterthought
If I remember, there are quite a few things that can reduce timing...What was you IAT at the time? Just look through all the parts in EDIT, you will come across different tabs that can reduce the timing....
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From: Glen Burnie, Md
Originally Posted by JxxxOxxxE
If I remember, there are quite a few things that can reduce timing...What was you IAT at the time? Just look through all the parts in EDIT, you will come across different tabs that can reduce the timing....
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Originally Posted by GrannySShifting
i know i cna FORCE it to run in High Octane table, but really dont want to bandaid, want to know why it is.
joel
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Originally Posted by GrannySShifting
as long as its reading over 1% tps it should never be in the closed throttle tables right, its soley off of TPS correct?
There are instances where it (the PCM) will chase the timing to the lowest timing value available- regardless of the table "name". I don't know how it does it, but it can be followed by testing with Edit changes and subsequent scans. I've seen it with my Z06 along with a fueling issue - just so you know I'm not blowing internet smoke here.
I believe it was a post by NoGo
(He is The MAN) where it was stated that default states were present and the PCM would chase timing advance to the lowest table value.Hope this helps some. Good Luck. FWIW.
joel
Originally Posted by binksz06
Flashing the PCM with Edit should put you back to 100% use (factor) of the High Octane Table. Go to Eng Cal -> Ignition -> Knock learn -> Min RPM. Set Min RPM to a value you'll not see- say 6800 RPM for example. This will hold it in the high Octane Table......scan and check your values for Spark Advance.
You might want to increase your rate of decay (Knock), also. Eng Cal-> Ignition-> Knock Retard -> Decay vs RPM - set it @ 128, all cells. FWIW.
joel
You might want to increase your rate of decay (Knock), also. Eng Cal-> Ignition-> Knock Retard -> Decay vs RPM - set it @ 128, all cells. FWIW.
joel
BowlingSS
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Originally Posted by Bill Bowling
What do you think of changing both the decay and min rpm even if you are not having any problems?
BowlingSS
BowlingSS
Personally, I wouldn't increase the min learn value - unless for tuning or diagnostic purposes. I was told by a "PCM Guru" to increase my knock decay value to 128 - so I did. He said stock value was very slow.
joel