HPT and LC1 problem.....
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10 Second Club
Joined: Aug 2003
Posts: 190
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From: Mirabel, Québec, Canada
HPT and LC1 problem..... I log two LC1 widebands using VCM Scanner and the AFR value is nowhere near stable...
It jumps from 13-14-15-14-13-14-13-15-14... or something like that...
Even with the engine off, it will not stabilize, it just jumps very quickly between AFR values like that...
I also did some voltmeter tests.... and.... the LC1 output voltage is extremely stable....
So I programmed my LC1 to output 1.5V whatever AFR it reads...
On the voltmeter I see a constant 1.492V
But on HP tuners I see anywhere from 1.3 to 1.7 volts and it is going evewhere in between these two values extremely fast at random...
Then I tried to hook up a 1.5 V battery to HP Tuners, and tada... a steady 1.59V....
So... Steady LC1 Output, and battery voltage indicate steady in hp...
Now what is my problem here?
BTW I use a desktop computer for these tests... Should I use a laptop instead?
It jumps from 13-14-15-14-13-14-13-15-14... or something like that...
Even with the engine off, it will not stabilize, it just jumps very quickly between AFR values like that...
I also did some voltmeter tests.... and.... the LC1 output voltage is extremely stable....
So I programmed my LC1 to output 1.5V whatever AFR it reads...
On the voltmeter I see a constant 1.492V
But on HP tuners I see anywhere from 1.3 to 1.7 volts and it is going evewhere in between these two values extremely fast at random...
Then I tried to hook up a 1.5 V battery to HP Tuners, and tada... a steady 1.59V....
So... Steady LC1 Output, and battery voltage indicate steady in hp...
Now what is my problem here?
BTW I use a desktop computer for these tests... Should I use a laptop instead?
I'll have to go look at mine now...I didn't notice anything too terribly erratic with mine...the readings do jump around a lot, and very quickly at that, but I kinda expect it to. When I look at the averages in the histogram though, it all evens out quite nicely and runs right where it is supposed to.
