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Today's topics:
* Test - 1 messages, 1 author
http://groups.google.com/group/alt.autos.nissan/t/97ee2a29c20c1f1f?hl=en
* 91 sentra 1.6 liter possible cause of stumble on acceleration? - 6 messages,
3 authors
http://groups.google.com/group/alt.autos.nissan/t/d80d5998d80a5a88?hl=en
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TOPIC: Test
http://groups.google.com/group/alt.autos.nissan/t/97ee2a29c20c1f1f?hl=en
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== 1 of 1 ==
Date: Wed, Mar 24 2010 9:20 am
From: me
On Wed, 24 Mar 2010 10:29:51 -0600, "Anyolmouse"
<Anyolmouse@invalid.invalid> wrote:
>But a Constitution of Government once changed from Freedom, can never be
>restored. Liberty, once lost, is lost forever.
>John Adams, letter to Abigail Adams, July 17, 1775
>
But there's terrorists on our doorstep! Terrorists I tell you!
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TOPIC: 91 sentra 1.6 liter possible cause of stumble on acceleration?
http://groups.google.com/group/alt.autos.nissan/t/d80d5998d80a5a88?hl=en
==============================================================================
== 1 of 6 ==
Date: Thurs, Mar 25 2010 9:00 am
From: robbie
I just decided on a whim to test the ignition coil because it was
something i hadn't thought of looking at before.
the specs say the readings should be .9 ohms and 13k ohms. My readings
which i took multiple times were 1.6 ohms and 13k ohms. so - any
experts out there willing to say that this could be a potential
culprit? according to the (Haynes) manual - replace the coil if it is
out of spec. So with a higher resistance I am thinking weaker spark? =
poor performance? - especially when a lot of fuel is being added to
the fire (@WOT) ?
If this is the solution I will kick myself for not finding it sooner-
i was wholly focused on a fuel delivery/vacuum leak theory and used my
shade tree knowledge of ignition and spark that says if a coil works
it works correctly all the time! Thanks to all posters who can help me
out.
== 2 of 6 ==
Date: Thurs, Mar 25 2010 11:35 am
From: Peter Hill
On Thu, 25 Mar 2010 09:00:09 -0700 (PDT), robbie
<robbie.h.wilson@gmail.com> wrote:
>I just decided on a whim to test the ignition coil because it was
>something i hadn't thought of looking at before.
>the specs say the readings should be .9 ohms and 13k ohms. My readings
>which i took multiple times were 1.6 ohms and 13k ohms. so - any
>experts out there willing to say that this could be a potential
>culprit? according to the (Haynes) manual - replace the coil if it is
>out of spec. So with a higher resistance I am thinking weaker spark? =
>poor performance? - especially when a lot of fuel is being added to
>the fire (@WOT) ?
>If this is the solution I will kick myself for not finding it sooner-
>i was wholly focused on a fuel delivery/vacuum leak theory and used my
>shade tree knowledge of ignition and spark that says if a coil works
>it works correctly all the time! Thanks to all posters who can help me
>out.
RE: Primary 0.9ohm. Are you completely sure your meter is accurate at
such a low resistance? Milliohm meters cost.
make a milliohm adaptor
http://www.freeinfosociety.com/electronics/schematics/sensor-based/milliohmadapter.pdf
Find a 1 or 2ohm, 1 or 0.1% resistor, or put 10 x 10ohms resistors in
parrallel and calibrate it. Then test test lead quality by testing
resistance direct to meter terminals and though leads. Then throw the
leads away and get some very good ones.
--
Peter Hill
Spamtrap reply domain as per NNTP-Posting-Host in header
Can of worms - what every fisherman wants.
Can of worms - what every PC owner gets!
== 3 of 6 ==
Date: Thurs, Mar 25 2010 1:06 pm
From: robbie
On Mar 25, 2:35 pm, Peter Hill <peter.usen...@nospam.demon.co.uk>
wrote:
> On Thu, 25 Mar 2010 09:00:09 -0700 (PDT), robbie
>
> <robbie.h.wil...@gmail.com> wrote:
> >I just decided on a whim to test the ignition coil because it was
> >something i hadn't thought of looking at before.
> >the specs say the readings should be .9 ohms and 13k ohms. My readings
> >which i took multiple times were 1.6 ohms and 13k ohms. so - any
> >experts out there willing to say that this could be a potential
> >culprit? according to the (Haynes) manual - replace the coil if it is
> >out of spec. So with a higher resistance I am thinking weaker spark? =
> >poor performance? - especially when a lot of fuel is being added to
> >the fire (@WOT) ?
> >If this is the solution I will kick myself for not finding it sooner-
> >i was wholly focused on a fuel delivery/vacuum leak theory and used my
> >shade tree knowledge of ignition and spark that says if a coil works
> >it works correctly all the time! Thanks to all posters who can help me
> >out.
>
> RE: Primary 0.9ohm. Are you completely sure your meter is accurate at
> such a low resistance? Milliohm meters cost.
>
> make a milliohm adaptorhttp://www.freeinfosociety.com/electronics/schematics/sensor-based/mi...
>
> Find a 1 or 2ohm, 1 or 0.1% resistor, or put 10 x 10ohms resistors in
> parrallel and calibrate it. Then test test lead quality by testing
> resistance direct to meter terminals and though leads. Then throw the
> leads away and get some very good ones.
> --
> Peter Hill
> Spamtrap reply domain as per NNTP-Posting-Host in header
> Can of worms - what every fisherman wants.
> Can of worms - what every PC owner gets!
nope i'm not completely sure. its a cheap craftsman dmm with ohms
reading. it read the 13 KOhms side perfectly but as i've found from
research in just a few minutes the low reading's accuracy is
automatically in doubt, because of the cheap design of the meter. how
about this for a cheap way to accurately measure the low resistance:
http://diyaudioprojects.blogspot.com/2008/11/simple-low-resistance-measurement.html
its a way to send a small current through the coil to measure the
voltage, then use the classic v= ir formula (or in this case r=v/i) to
get an accurate reading of the true resistance.
but before i build a test kit like this- could it cause drivability
issues? thanks!
== 4 of 6 ==
Date: Thurs, Mar 25 2010 4:14 pm
From: Peter Hill
On Thu, 25 Mar 2010 13:06:26 -0700 (PDT), robbie
<robbie.h.wilson@gmail.com> wrote:
>On Mar 25, 2:35 pm, Peter Hill <peter.usen...@nospam.demon.co.uk>
>wrote:
>> On Thu, 25 Mar 2010 09:00:09 -0700 (PDT), robbie
>>
>> <robbie.h.wil...@gmail.com> wrote:
>> >I just decided on a whim to test the ignition coil because it was
>> >something i hadn't thought of looking at before.
>> >the specs say the readings should be .9 ohms and 13k ohms. My readings
>> >which i took multiple times were 1.6 ohms and 13k ohms. so - any
>> >experts out there willing to say that this could be a potential
>> >culprit? according to the (Haynes) manual - replace the coil if it is
>> >out of spec. So with a higher resistance I am thinking weaker spark? =
>> >poor performance? - especially when a lot of fuel is being added to
>> >the fire (@WOT) ?
>> >If this is the solution I will kick myself for not finding it sooner-
>> >i was wholly focused on a fuel delivery/vacuum leak theory and used my
>> >shade tree knowledge of ignition and spark that says if a coil works
>> >it works correctly all the time! Thanks to all posters who can help me
>> >out.
>>
>> RE: Primary 0.9ohm. Are you completely sure your meter is accurate at
>> such a low resistance? Milliohm meters cost.
>>
>> make a milliohm adaptorhttp://www.freeinfosociety.com/electronics/schematics/sensor-based/mi...
>>
>> Find a 1 or 2ohm, 1 or 0.1% resistor, or put 10 x 10ohms resistors in
>> parrallel and calibrate it. Then test test lead quality by testing
>> resistance direct to meter terminals and though leads. Then throw the
>> leads away and get some very good ones.
>> --
>> Peter Hill
>> Spamtrap reply domain as per NNTP-Posting-Host in header
>> Can of worms - what every fisherman wants.
>> Can of worms - what every PC owner gets!
>
>nope i'm not completely sure. its a cheap craftsman dmm with ohms
>reading. it read the 13 KOhms side perfectly but as i've found from
>research in just a few minutes the low reading's accuracy is
>automatically in doubt, because of the cheap design of the meter. how
>about this for a cheap way to accurately measure the low resistance:
>http://diyaudioprojects.blogspot.com/2008/11/simple-low-resistance-measurement.html
>its a way to send a small current through the coil to measure the
>voltage, then use the classic v= ir formula (or in this case r=v/i) to
>get an accurate reading of the true resistance.
>but before i build a test kit like this- could it cause drivability
>issues? thanks!
The link I posted before won't work on high inductance.
Scroll down to High Inductance Resistance Measurement on this page.
http://www.valhallascientific.com/applications/applications-6.shtml
Here's a better one.
http://www.wentztech.com/radio/Projects/Projects_assets/AN106.pdf
Just don't run it too long and overheat the coil. Power = Volts x
Amps, 5 volts at 1 amp, coil is going to get hot like it has a 5w bulb
inside it. A typical coil will dissipate 20W in normal use.
--
Peter Hill
Spamtrap reply domain as per NNTP-Posting-Host in header
Can of worms - what every fisherman wants.
Can of worms - what every PC owner gets!
== 5 of 6 ==
Date: Thurs, Mar 25 2010 3:41 pm
From: "NissTech"
after re reading your previous posts , I think what you are experiencing is
the engine going into fuel cut or rev limiter mode, this feature is built
into ALL Nissans. the quick and easy fix is not to go to WFO (wide fucking
open) throttle.
The throttle position switch/sensor have a WOT contact so when you mat the
thing the contact closes and the rev limiter is engaged
"robbie" <robbie.h.wilson@gmail.com> wrote in message
news:282bd56b-1530-4722-a76a-1be5476586e8@l25g2000yqd.googlegroups.com...
>I just decided on a whim to test the ignition coil because it was
> something i hadn't thought of looking at before.
> the specs say the readings should be .9 ohms and 13k ohms. My readings
> which i took multiple times were 1.6 ohms and 13k ohms. so - any
> experts out there willing to say that this could be a potential
> culprit? according to the (Haynes) manual - replace the coil if it is
> out of spec. So with a higher resistance I am thinking weaker spark? =
> poor performance? - especially when a lot of fuel is being added to
> the fire (@WOT) ?
> If this is the solution I will kick myself for not finding it sooner-
> i was wholly focused on a fuel delivery/vacuum leak theory and used my
> shade tree knowledge of ignition and spark that says if a coil works
> it works correctly all the time! Thanks to all posters who can help me
> out.
== 6 of 6 ==
Date: Thurs, Mar 25 2010 7:10 pm
From: robbie
On Mar 25, 6:41 pm, "NissTech" <mikeh...@msn.com> wrote:
> after re reading your previous posts , I think what you are experiencing is
> the engine going into fuel cut or rev limiter mode, this feature is built
> into ALL Nissans. the quick and easy fix is not to go to WFO (wide fucking
> open) throttle.
>
> The throttle position switch/sensor have a WOT contact so when you mat the
> thing the contact closes and the rev limiter is engaged
>
> "robbie" <robbie.h.wil...@gmail.com> wrote in message
>
> news:282bd56b-1530-4722-a76a-1be5476586e8@l25g2000yqd.googlegroups.com...
>
> >I just decided on a whim to test the ignition coil because it was
> > something i hadn't thought of looking at before.
> > the specs say the readings should be .9 ohms and 13k ohms. My readings
> > which i took multiple times were 1.6 ohms and 13k ohms. so - any
> > experts out there willing to say that this could be a potential
> > culprit? according to the (Haynes) manual - replace the coil if it is
> > out of spec. So with a higher resistance I am thinking weaker spark? =
> > poor performance? - especially when a lot of fuel is being added to
> > the fire (@WOT) ?
> > If this is the solution I will kick myself for not finding it sooner-
> > i was wholly focused on a fuel delivery/vacuum leak theory and used my
> > shade tree knowledge of ignition and spark that says if a coil works
> > it works correctly all the time! Thanks to all posters who can help me
> > out.
so is the rev limiter built into the tps able to be bypassed? or can i
test the tps/adjust it? or is my only real test replace the tps and
see if that fixes it?
Thanks!
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