could the TPS really make a difference???
07-30-2002, 10:01 AM
#1
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Join Date: Dec 1969
Location: indlps,in
Posts: 41
could the TPS really make a difference???
could the TPS setting at idle really make a difference on an OBD II car? My tuner had mentioned that the TPS should be set at .67 V at idle. I always thought that on an OBD II car, as long as it was set at between .3-.9 V, the PCM sets that voltage as idle voltage and everything is fine. PERHAPS that's wrong. I've been having a historical misfires in just the first 4 cylinders (cylinders #1,2,3 & 4). no codes. So, last nite, i slotted the TPS so that i can rotate it and set it at .71 volts. It had been set at .52 volts. I drive to work today. I would normal run a history of 500-800 misfires for those cylinders for the drive. I get to work and check the misfire history and it is 0. HMMMM....I'll be going out to lunch...we'll see how we do. "THE MORE I THINK I KNOW ABOUT THESE CAR, THE LESS I ACTUALLY DO."
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'97SS, More Performance 396, AS&M cold air, Grotyohann LT, SLP 2ODL muffler, Magnacor, PCMFORLESS PCM, LS1 twin piston calipers, KVR crossdrilled and coated rotors, SLP stage II w/ KYB AGX, 6M, Star Stage II.
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'97SS, More Performance 396, AS&M cold air, Grotyohann LT, SLP 2ODL muffler, Magnacor, PCMFORLESS PCM, LS1 twin piston calipers, KVR crossdrilled and coated rotors, SLP stage II w/ KYB AGX, 6M, Star Stage II.
07-31-2002, 07:51 AM
#2
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Join Date: Dec 1969
Location: indlps,in
Posts: 41
well, it reduced the misfire history by about 1/2 overall. in the cool mornings, no misfire history. In the heat of the afternoon, seems to be about 1/2 of what i would have expected. encouraging....
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'97SS, More Performance 396, AS&M cold air, Grotyohann LT, SLP 2ODL muffler, Magnacor, PCMFORLESS PCM, LS1 twin piston calipers, KVR crossdrilled and coated rotors, SLP stage II w/ KYB AGX, 6M, Star Stage II.
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'97SS, More Performance 396, AS&M cold air, Grotyohann LT, SLP 2ODL muffler, Magnacor, PCMFORLESS PCM, LS1 twin piston calipers, KVR crossdrilled and coated rotors, SLP stage II w/ KYB AGX, 6M, Star Stage II.
08-07-2002, 10:02 AM
#3
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Join Date: Dec 1969
Location: indlps,in
Posts: 41
well, got rid of the misfires in cylinder's 1,2,3 and 4. I advanced my base timing by 2 degrees and added 10% more fuel over my base setting. I had no historical misfires yesterday.today, i reduced fuel back to 5% over base. we'll see how we do. I did knotice , as i played with my base timing (advancing and retarding from my base setting), the split BLM's would come and go. seems to definately affect them. I re-balanced via the adjustment to the Throttle plate stop screw that then affects TPS and IAC counts. Interesting car...smile...
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'97SS, More Performance 396, AS&M cold air, Grotyohann LT, SLP 2ODL muffler, Magnacor, PCMFORLESS PCM, LS1 twin piston calipers, KVR crossdrilled and coated rotors, SLP stage II w/ KYB AGX, 6M, Star Stage II.
[This message has been edited by carl97ss (edited August 07, 2002).]
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'97SS, More Performance 396, AS&M cold air, Grotyohann LT, SLP 2ODL muffler, Magnacor, PCMFORLESS PCM, LS1 twin piston calipers, KVR crossdrilled and coated rotors, SLP stage II w/ KYB AGX, 6M, Star Stage II.
[This message has been edited by carl97ss (edited August 07, 2002).]
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