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HELP!!! Very Confused!!! Two Graphs to compare.

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Old Jun 18, 2005 | 08:16 PM
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Default Calling EXPERTS!!! NEED HELP!!! Two Graphs to compare.
Ok, I posted a thread awhile back asking what everyone thought the problem could be. Almost everyone said that it's valve springs. So, I bought some Comp 918 valve springs, retainers and locks and installed them. Just got re-dynoed today and now I am more confused. The problem improved in the fact that its not intermittent. Sometimes it happens very little or not at all, and sometimes happens alot. Problem is, I don't know what is done to the car. I bought the car used with 42k miles on it from a Dealership in Garland, TX and it had some mods already. Several people have told me there is a Stall converter in the car, some have said there is a cam in the car... I just need to know what I should look at next. My goal is to get a smooth powerband with no dips/misses. What could the problem be?

Before valvesprings:


After valvesprings:
Last edited by DarknessZ28; Jun 20, 2005 at 12:09 AM.
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Old Jun 19, 2005 | 12:01 AM
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Could it be a bad plug wire that theyre getting the signal from.
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Old Jun 19, 2005 | 12:30 AM
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You can hear/feel it missing at high rpms under WOT...
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Old Jun 20, 2005 | 12:11 AM
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Any ideas?
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Old Jun 20, 2005 | 02:35 AM
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Originally Posted by DarknessZ28
Any ideas?
I am having the same problems...

http://www.ctbasses.com/misc/run02.jpg
http://www.ctbasses.com/misc/run03.jpg
http://www.ctbasses.com/misc/run04.jpg
http://www.ctbasses.com/misc/run05.jpg

Optispark was new from GM when the motor went in, LT4 Knock module, new plugs, new coil, wires aren't arcing.

I am at a loss.
-Aaron
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Old Jun 21, 2005 | 10:28 PM
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Anyone have an idea of what I should check next?
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Old Jun 28, 2005 | 03:10 AM
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Anybody with any input? PLEASE?
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Old Jul 15, 2005 | 02:02 AM
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ttt - bump
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Old Jul 17, 2005 | 02:04 PM
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is it detonating? what do the plugs loook like, air/fuel it could be a milion things but need more info
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Old Jul 25, 2005 | 04:02 AM
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Does anyone think that bad harmonics from a faulty crank pulley could cause a dip like that?
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Old Aug 5, 2005 | 04:43 AM
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The power is smooth with no problems so far with the stock crank pulley installed... I hope that the faulty ASP pulley was the problem..
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