If your supercharged don't use the platinum plugs. Use copper, autolite 104 should be fine.
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Well i ran the tests a few nights ago and found that the knock retard no longer was following the shift points as much as in the first graphs. Infact the knock retard came on sooner! So i graphed the Throttle position sensor and for the most part the knock always happens at about 75%+ throttle. Interesting enough i started getting an engine code "random/multiple misfire cylinder #1". So I decided to do a little under the hood inspection as was suggested by BillBoost37 earlier. I first started out by pulling spark plug #1 (Because of the DTC). While trying to pull off the wire off of the top of the spark plug, the wire came loose from the connector that connects to the top of the spark plug! below is an image of the rusted out wire (Connector is not visible, it is on the spark plug shown below)
http://fireball.dnsdojo.com/images/Bad Connector 2.JPG http://fireball.dnsdojo.com/images/Bad Connector 1.JPG OK so thats probably a big part of the problem..... Here is the spark plug itself http://fireball.dnsdojo.com/images/Bad Plug 1.JPG http://fireball.dnsdojo.com/images/Bad Plug 2.JPG Currently the gap is at 0.0615" These are NGK irridium plugs and "Supermag A07" wires with approximately 40000 miles on them. Needless to say a plugs and wires job is in order for tomorrow night. |
I'm sure that's not helping any. New wires are a good idea. Autolites are about $1.69 each, so that cheap. Gap them at .055 and go one range colder then stock. That would be the 605.
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Well I installed the new spark plugs and wires. I went with Autolite 104's. I ran the tests again. I noticed a big difference in response and knock retard. Please note that this graph was taken with 89 octane fuel, I was in Iowa this last weekend and it is really hard to find 91+ fuel down there. Can you let me know if this looks more like it should or if the knock still seems high, Thanks!
http://fireball.dnsdojo.com/Images/K...tard_Test4.bmp Black = Vehicle Speed Blue = Knock Retard Green = Ignition Timing Advance Orange = Engine Speed |
OK, it is better, and better gas will help a bit. But I see your timing at about 10 or 11 deg. Unless I'm wrong you should be 14* at the lowest. Did you say you had 3* taken off the PCM? I can't remember. If you go back to stock timing that will remove 3 or 4* from the KR and that takes care of most of what's left leaving perhaps 3*, better gas should drop another deg. and that will get you were you want to be. Also, what did you gap the plugs at?
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My PCM is 100% stock, i havent changed anything with that. The plugs right out of the box were at ~.054 so i didnt bother with changing the gap on them.
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Hmmm, your timing seems really low. Mine floats around 15* and only getting to 14* breifly.
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Do you think it might have something to do with the fact that i have only put 1 driving cycle on the new plugs? Maybe the computer is still "Learning" the new plugs?
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Originally Posted by Danthurs
(Post 1350159)
Hmmm, your timing seems really low. Mine floats around 15* and only getting to 14* breifly.
because the car has learned the KR it tries to back off the timing to prevent the KR, that is why the timing is low |
I figure i will run the car for a week or so and get 10+ trips on it and some 92 octane fuel in it to see where i am at then test it again
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