Hz testing map
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5th Wheeling
Joined: Jun 2023
Posts: 28
Likes: 1
Hz testing map
91 F 150 w 5.0
When Hz testing my map sensor getting Hz reading without even grounding out the other probe of my meter. The numbers are pretty much correct according to the scale, only 2 Hz off when throughout atmosphere, 5"hg, 10"hg, 15"hg, 20" hg.. what does this mean?
When Hz testing my map sensor getting Hz reading without even grounding out the other probe of my meter. The numbers are pretty much correct according to the scale, only 2 Hz off when throughout atmosphere, 5"hg, 10"hg, 15"hg, 20" hg.. what does this mean?
Fleet Mechanic
Joined: Mar 2014
Posts: 1,926
Likes: 116
From: Saskatchewan Canada
I'm actually kind of impressed that you would go to the trouble of checking that. I had to search for what sort of results you may find and I found this.
https://f01.justanswer.com/nmwagscha...nge_charts.pdf
Now, given that the frequency range is something like 80 to 150 hz, I don't think a 2 hz error would be significant. As to why you get a reading with only 1 lead connected, that may depend on your measuring equipment. A hi Z input with lots of sensitivity may show a reading with the return disconnected, but I would certainly question accuracy till you had a hookup within the design of your equipment. Since we don't know what you are measuring with, any guess we make will be pretty much useless.
https://f01.justanswer.com/nmwagscha...nge_charts.pdf
Now, given that the frequency range is something like 80 to 150 hz, I don't think a 2 hz error would be significant. As to why you get a reading with only 1 lead connected, that may depend on your measuring equipment. A hi Z input with lots of sensitivity may show a reading with the return disconnected, but I would certainly question accuracy till you had a hookup within the design of your equipment. Since we don't know what you are measuring with, any guess we make will be pretty much useless.
Thread Starter
|
5th Wheeling
Joined: Jun 2023
Posts: 28
Likes: 1
I'm actually kind of impressed that you would go to the trouble of checking that. I had to search for what sort of results you may find and I found this.
https://f01.justanswer.com/nmwagscha...nge_charts.pdf
Now, given that the frequency range is something like 80 to 150 hz, I don't think a 2 hz error would be significant. As to why you get a reading with only 1 lead connected, that may depend on your measuring equipment. A hi Z input with lots of sensitivity may show a reading with the return disconnected, but I would certainly question accuracy till you had a hookup within the design of your equipment. Since we don't know what you are measuring with, any guess we make will be pretty much useless.
https://f01.justanswer.com/nmwagscha...nge_charts.pdf
Now, given that the frequency range is something like 80 to 150 hz, I don't think a 2 hz error would be significant. As to why you get a reading with only 1 lead connected, that may depend on your measuring equipment. A hi Z input with lots of sensitivity may show a reading with the return disconnected, but I would certainly question accuracy till you had a hookup within the design of your equipment. Since we don't know what you are measuring with, any guess we make will be pretty much useless.
So far have replaced EGR control solenoid, iac valve, TPS sensor, map, O2. Just took it for a short test drive and I think new sensors made my check engine light stay off, also realized the high idle has gone down when I put it in gear.Does anyone understand why the truck will idle high in park but go down to normal when in gear?
Fleet Mechanic
Joined: Mar 2014
Posts: 1,926
Likes: 116
From: Saskatchewan Canada
That's a pretty decent DVOM/clamp on ammeter. Likely designed more for the electrician than for automotive work, but it would be pretty hard to hurt that instrument with the voltages found in your truck.
Now, what I don't know from this post is that you have another post going where you discuss all the diagnosis you have already done. Just to help everyone out a bit, probably best to continue the discussion there.
https://www.ford-trucks.com/forums/1...se-help-2.html
Now, what I don't know from this post is that you have another post going where you discuss all the diagnosis you have already done. Just to help everyone out a bit, probably best to continue the discussion there.
https://www.ford-trucks.com/forums/1...se-help-2.html
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