Is my Ta down on power ??
08-17-2006, 06:19 PM
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Originally Posted by Shinerbock07
sounds like bent pushrods! GM Stock pushrods suck!
08-18-2006, 02:10 PM
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Thanks for all of the suggestions guys !!
actually the 99 has lazy O2's but what does that matter. At WOT the Power Enrichment is enabled. I thought that the O2's are only referenced while cruising not WOT. My O2s on the scanner @ WOT read anywhere from 870 to 940 mv.
Bent pushrods ??? No, I'd hear that, and if that were the case I would not have made the post and would have fixed it already. There would be a lot of rocker noise if there was a bent push rod.
Originally Posted by RPM WS6
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Any chance that the O2 sensors on the '98 might be getting lazy? Or perhaps an exhaust leak forward of the front O2s? Any introduction of outside air pre-O2 sensor will cause false readings and poor A/F ratio.
Any chance that the O2 sensors on the '98 might be getting lazy? Or perhaps an exhaust leak forward of the front O2s? Any introduction of outside air pre-O2 sensor will cause false readings and poor A/F ratio.
Originally Posted by Shinerbock07
sounds like bent pushrods! GM Stock pushrods suck!
Last edited by LittleSlow1; 08-18-2006 at 02:17 PM.
08-18-2006, 07:46 PM
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Originally Posted by LittleSlow1
actually the 99 has lazy O2's but what does that matter. At WOT the Power Enrichment is enabled. I thought that the O2's are only referenced while cruising not WOT. My O2s on the scanner @ WOT read anywhere from 870 to 940 mv.
Anything that contributes to a lean A/F at cruise (such as a vacuum leak or a pre O2 sensor exhaust leak) will cause your LTFTs (long term fuel trims) to go positive (add fuel). If your LTFTs are positive (LTFT range is -25% to +25%) just prior to going WOT, then they will lock at that percentage, thus adding more fuel than just the PE table normally would, thereby causing you to run overly rich at WOT. This is why a good tuner will always try to get the LTFTs to 0% (or slightly negative) at cruise. If the LTFT is 0% or a negative value at cruise, then it will lock at 0% at WOT and not effect your proper WOT fueling.
Do you have a scanner to log data with? That would really help.
08-19-2006, 10:22 AM
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Originally Posted by LittleSlow1
Thanks for all of the suggestions guys !!
actually the 99 has lazy O2's but what does that matter. At WOT the Power Enrichment is enabled. I thought that the O2's are only referenced while cruising not WOT. My O2s on the scanner @ WOT read anywhere from 870 to 940 mv.
Bent pushrods ??? No, I'd hear that, and if that were the case I would not have made the post and would have fixed it already. There would be a lot of rocker noise if there was a bent push rod.
actually the 99 has lazy O2's but what does that matter. At WOT the Power Enrichment is enabled. I thought that the O2's are only referenced while cruising not WOT. My O2s on the scanner @ WOT read anywhere from 870 to 940 mv.
Bent pushrods ??? No, I'd hear that, and if that were the case I would not have made the post and would have fixed it already. There would be a lot of rocker noise if there was a bent push rod.
08-21-2006, 10:10 AM
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Originally Posted by RPM WS6
Do you have a scanner to log data with? That would really help.
08-23-2006, 08:57 PM
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Finally got 12s guys, thanks for the suggestions. I found a lean spot during the runs. I gave it some more fuel and I'm sure the cool weather helped it out too. The car went 12.95 @ 103mph. I still think the mph is kinda low, but hopefully I'll get the exhaust cut out welded on soon. 
