PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

lc-1 probs

Old Jul 2, 2005 | 01:18 PM
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Default lc-1 probs

i was tuning my car and everything was going good my afr was great and then all of the sudden my afr is going crazy. they were all around 13 which is what i commanded now my afr will not stay still on the histogram. it bounces from 11-14 afr. it was working perfect and now i cant get a good reading. could my sensor be bad already or what? how do i tell?
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Old Jul 3, 2005 | 10:38 AM
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Originally Posted by bmfcamaro
i was tuning my car and everything was going good my afr was great and then all of the sudden my afr is going crazy. they were all around 13 which is what i commanded now my afr will not stay still on the histogram. it bounces from 11-14 afr. it was working perfect and now i cant get a good reading. could my sensor be bad already or what? how do i tell?

update: now i am getting either 7 or 21 afr constantly.
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Old Jul 4, 2005 | 12:07 AM
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Measure the output voltage of the module. If its at 7 you've got 0volts, and if at 20 you've got 5 volts. Either could be given by a bad ground or power to the LM-1 module
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Old Jul 4, 2005 | 03:26 AM
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nothing was changed in between runs. the voltage matches the afr, but it only gives two numbers 7 and 21.
0 and 4.88 volts
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Old Jul 4, 2005 | 02:10 PM
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Originally Posted by bmfcamaro
nothing was changed in between runs. the voltage matches the afr, but it only gives two numbers 7 and 21.
0 and 4.88 volts
Contact the guys over at HP Tuners, could be a module problem?
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Old Jul 4, 2005 | 03:37 PM
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i have been working with ken with my tuning. i am waiting for him to get back to me. i think it might be the lc-1 itself. my hptuners works fine.
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Old Jul 5, 2005 | 07:51 AM
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Originally Posted by bmfcamaro
nothing was changed in between runs. the voltage matches the afr, but it only gives two numbers 7 and 21.
0 and 4.88 volts
Sorry mis-understood the quote. If it's only giving 5 volts and zero volts and siplaying as such, then it's the LC-1. How many times have you calibrated the LC-1? Calibrated in free air, or just in the exhaust pipes?
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Old Jul 5, 2005 | 04:12 PM
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4 or five total.
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