High Oxygen Sensor Voltage Preventing TTS V-Tune Data Collection
Thread Starter
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Tourer
Joined: Aug 2008
Posts: 345
Likes: 3
Do you have cu inch and injector constants set correctly? Lots of times I have had to manually lower the ve's in areas to be able to collect data. A quick test would be to increase your injector constant and see what the voltages do. I wouldn't leave it like that as you may run out of room on the ve tables in other areas.
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Tourer
Joined: Aug 2008
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Likes: 3
I did some more problem diagnosis this evening and I've some up with some more data that may help diagnose the problem.
1. I pulled the spark plugs and they are smutted up which indicates a rich tune. This is not really a surprise since the oxygen sensors are indicating a rich condition.
2. The ECM has generated two trouble codes. I don't have the exact codes handy, but they were "high front oxygen sensor voltage" and "high rear oxygen sensor voltage".
3. Even though the ECM has not generated a misfire code, it is evident that the engine is misfiring. This is very pronounced at around 3000 rpm. Even with the tall cam that I have, at 3000 rpm things should be smoothed out.
4. At a warm idle at about 1000 rpm the MAP sensor is reading about 50 kPa. This seems pretty high. I compared it to some V-tunes from my 96ci build and my father-in-law's 103ci build and this MAP pressure is definitely higher. The other ones were running at about 35-40 kPa.
I'm perplexed.
1. I pulled the spark plugs and they are smutted up which indicates a rich tune. This is not really a surprise since the oxygen sensors are indicating a rich condition.
2. The ECM has generated two trouble codes. I don't have the exact codes handy, but they were "high front oxygen sensor voltage" and "high rear oxygen sensor voltage".
3. Even though the ECM has not generated a misfire code, it is evident that the engine is misfiring. This is very pronounced at around 3000 rpm. Even with the tall cam that I have, at 3000 rpm things should be smoothed out.
4. At a warm idle at about 1000 rpm the MAP sensor is reading about 50 kPa. This seems pretty high. I compared it to some V-tunes from my 96ci build and my father-in-law's 103ci build and this MAP pressure is definitely higher. The other ones were running at about 35-40 kPa.
I'm perplexed.
Last edited by Beach Bagger; Aug 2, 2014 at 09:47 PM.
Stellar HDF Member
Joined: Sep 2007
Posts: 2,459
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From: Vancouver Island B.C.
Did you collect cam tune data and set IVO?
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
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From: Phoenix '53, '88, '09 Big Twins
volts is how fast the electrons are moving
amps is how much force they move with
so it is possible with a meter to see "fast"/ high volts, when there is virtually no force behind it.
this can give spurious readings- which can head us down the wrong road.
current is measured by connecting the meter in series with the load
mike
Road Master
Joined: May 2008
Posts: 1,196
Likes: 14
From: connecticut
I did some more problem diagnosis this evening and I've some up with some more data that may help diagnose the problem.
1. I pulled the spark plugs and they are smutted up which indicates a rich tune. This is not really a surprise since the oxygen sensors are indicating a rich condition.
2. The ECM has generated two trouble codes. I don't have the exact codes handy, but they were "high front oxygen sensor voltage" and "high rear oxygen sensor voltage".
3. Even though the ECM has not generated a misfire code, it is evident that the engine is misfiring. This is very pronounced at around 3000 rpm. Even with the tall cam that I have, at 3000 rpm things should be smoothed out.
4. At a warm idle at about 1000 rpm the MAP sensor is reading about 50 kPa. This seems pretty high. I compared it to some V-tunes from my 96ci build and my father-in-law's 103ci build and this MAP pressure is definitely higher. The other ones were running at about 35-40 kPa.
I'm perplexed.
1. I pulled the spark plugs and they are smutted up which indicates a rich tune. This is not really a surprise since the oxygen sensors are indicating a rich condition.
2. The ECM has generated two trouble codes. I don't have the exact codes handy, but they were "high front oxygen sensor voltage" and "high rear oxygen sensor voltage".
3. Even though the ECM has not generated a misfire code, it is evident that the engine is misfiring. This is very pronounced at around 3000 rpm. Even with the tall cam that I have, at 3000 rpm things should be smoothed out.
4. At a warm idle at about 1000 rpm the MAP sensor is reading about 50 kPa. This seems pretty high. I compared it to some V-tunes from my 96ci build and my father-in-law's 103ci build and this MAP pressure is definitely higher. The other ones were running at about 35-40 kPa.
I'm perplexed.
Thread Starter
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Tourer
Joined: Aug 2008
Posts: 345
Likes: 3
I tried the cam tune function after I finished the break-in, but the graph did not indicate a pattern like the example given in the TTS manual. Mine had no defined point of upward inflection.
Thread Starter
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Tourer
Joined: Aug 2008
Posts: 345
Likes: 3
Is there a fuse that I should consider looking at in the fuse box?
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Thread Starter
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Tourer
Joined: Aug 2008
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Can anyone tell me what their MAP pressure generally reads at idle (~1k rpm). Mine is reading between 48-50 kPa.
Road Master
Joined: May 2008
Posts: 1,196
Likes: 14
From: connecticut
You will need to turn off the auto compression releases with the tts and hold the throttle blades wide open while doing the compression test. Make sure you rotate the engine over the same amount of revolutions. I use 5 revolutions per cylinder.
To check your heater voltage at the o2 sensors your going to need to backprobe them use a paper clip from the backside of the connector to get past the seal. I would not be wasting my time with the o2's until you confirm the internal engine is normal. With the misfire and high kpa Im suspecting something is off.