Re: Running Rich - 92-4.0L
 

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:453944C0.EF726C61@sympatico.ca...
> Les wrote:
>>
>> On 10/20/06 2:30 PM, in article Ts9_g.36203$iA5.20657@dukeread11, "DougW"
>> <post.replies@invalid.address> wrote:
>>
>> > Les wrote:
>> >
>> >>> Intake air temp sensor.
>> >
>> >> Can these be tested with a meter?
>> >
>> > Yes. they are just temperature sensitive
>> > resistors. (both mat and engine temp)
>> > http://revbeergoggles.com/Fixes/diagnostics.html
>>
>> Cool, but its time to talk dummy language...
>>
>> How does that table convert to an Ohms reading? My gauge (old needle
>> type)
>> read from 0 to 1K.
>>
>> Great Web Site!
>
> You 'really' don't want the VOM anywhere near the computer sensors. The
> load the meter puts on can fry computer circuits. Same for a test
> light.
>
> It's time to step up to a digital multimeter....
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)

Like a Fluke or it's equal.
Spdloader

Re: Running Rich - 92-4.0L
 

Spdloader wrote:

> When the sensor goes bad, it reports a cold condition that causes the system
> to go "full rich". Doesn't log a code, the computer just stays in cold start
> loop. Very common on GM 4.3 engines too.
> I don't have the operational parameters for testing with a meter, but
> someone here will.

I agree; the engine's probably stuck in open-loop mode. Older designs
like this often have 2 engine temp sensors: 1 for the guage, 1 for the
computer; if the computer temp sensor stops working for whatever reason,
this will keep it open, as will bad O2 sensors. A really bad IAT will
too. Older computers wouldn't set the MIL either.

I have to wonder, if the cats were tampered with, if the owner also just
pulled/disconnected the O2 sensors as well, which would cause this.

Re: Running Rich - 92-4.0L
 

Spdloader wrote:

> When the sensor goes bad, it reports a cold condition that causes the system
> to go "full rich". Doesn't log a code, the computer just stays in cold start
> loop. Very common on GM 4.3 engines too.
> I don't have the operational parameters for testing with a meter, but
> someone here will.

I agree; the engine's probably stuck in open-loop mode. Older designs
like this often have 2 engine temp sensors: 1 for the guage, 1 for the
computer; if the computer temp sensor stops working for whatever reason,
this will keep it open, as will bad O2 sensors. A really bad IAT will
too. Older computers wouldn't set the MIL either.

I have to wonder, if the cats were tampered with, if the owner also just
pulled/disconnected the O2 sensors as well, which would cause this.

Re: Running Rich - 92-4.0L
 

Spdloader wrote:

> When the sensor goes bad, it reports a cold condition that causes the system
> to go "full rich". Doesn't log a code, the computer just stays in cold start
> loop. Very common on GM 4.3 engines too.
> I don't have the operational parameters for testing with a meter, but
> someone here will.

I agree; the engine's probably stuck in open-loop mode. Older designs
like this often have 2 engine temp sensors: 1 for the guage, 1 for the
computer; if the computer temp sensor stops working for whatever reason,
this will keep it open, as will bad O2 sensors. A really bad IAT will
too. Older computers wouldn't set the MIL either.

I have to wonder, if the cats were tampered with, if the owner also just
pulled/disconnected the O2 sensors as well, which would cause this.

Re: Running Rich - 92-4.0L
 

I know I just stepped in on this one and it may have been suggested already,
but I had a leaking exhaust manifold gasket. The air coming in (yes it did
that) makes the O2 sensor think the engine is running lean and tells the
computer to richen (is that a real word?) the mixture. After replacing the
gasket and cleaning the sensor, my jeep ran better and mileage came back up.
Simple fix. Well simple parts, but PITA to do. If you are having a whistling
sound at highway speeds when feathering the gas pedal, that is a sure sign
of it, that being said if it goes on long enough the whistling will go away.
Got the t-shirt.
Rich Harris


"DougW" <post.replies@invalid.address> wrote in message
news:Peb_g.36208$iA5.27353@dukeread11...
> Les wrote:
>
>> Cool, but its time to talk dummy language...
>>
>> How does that table convert to an Ohms reading? My gauge (old needle
>> type) read from 0 to 1K.
>
> The table is in ohms, 0-1k is 0-1000. There is probably a scale setting
> on your meter. Look for 10k or 100k. Worst off you can get a cheap
> digital
> meter at RadioShack, AutoZone, PepBoys, etc.
>
>
>> Great Web Site!
>
>
>

Re: Running Rich - 92-4.0L
 

I know I just stepped in on this one and it may have been suggested already,
but I had a leaking exhaust manifold gasket. The air coming in (yes it did
that) makes the O2 sensor think the engine is running lean and tells the
computer to richen (is that a real word?) the mixture. After replacing the
gasket and cleaning the sensor, my jeep ran better and mileage came back up.
Simple fix. Well simple parts, but PITA to do. If you are having a whistling
sound at highway speeds when feathering the gas pedal, that is a sure sign
of it, that being said if it goes on long enough the whistling will go away.
Got the t-shirt.
Rich Harris


"DougW" <post.replies@invalid.address> wrote in message
news:Peb_g.36208$iA5.27353@dukeread11...
> Les wrote:
>
>> Cool, but its time to talk dummy language...
>>
>> How does that table convert to an Ohms reading? My gauge (old needle
>> type) read from 0 to 1K.
>
> The table is in ohms, 0-1k is 0-1000. There is probably a scale setting
> on your meter. Look for 10k or 100k. Worst off you can get a cheap
> digital
> meter at RadioShack, AutoZone, PepBoys, etc.
>
>
>> Great Web Site!
>
>
>

Re: Running Rich - 92-4.0L
 

I know I just stepped in on this one and it may have been suggested already,
but I had a leaking exhaust manifold gasket. The air coming in (yes it did
that) makes the O2 sensor think the engine is running lean and tells the
computer to richen (is that a real word?) the mixture. After replacing the
gasket and cleaning the sensor, my jeep ran better and mileage came back up.
Simple fix. Well simple parts, but PITA to do. If you are having a whistling
sound at highway speeds when feathering the gas pedal, that is a sure sign
of it, that being said if it goes on long enough the whistling will go away.
Got the t-shirt.
Rich Harris


"DougW" <post.replies@invalid.address> wrote in message
news:Peb_g.36208$iA5.27353@dukeread11...
> Les wrote:
>
>> Cool, but its time to talk dummy language...
>>
>> How does that table convert to an Ohms reading? My gauge (old needle
>> type) read from 0 to 1K.
>
> The table is in ohms, 0-1k is 0-1000. There is probably a scale setting
> on your meter. Look for 10k or 100k. Worst off you can get a cheap
> digital
> meter at RadioShack, AutoZone, PepBoys, etc.
>
>
>> Great Web Site!
>
>
>

Re: Running Rich - 92-4.0L
 

"Enrich."

Earle

"Rich" <harrisfam1988@verizon.net> wrote in message
news:SGq0h.23$gf5.22@trndny01...
> I know I just stepped in on this one and it may have been suggested
already,
> but I had a leaking exhaust manifold gasket. The air coming in (yes it did
> that) makes the O2 sensor think the engine is running lean and tells the
> computer to richen (is that a real word?) the mixture. After replacing the
> gasket and cleaning the sensor, my jeep ran better and mileage came back
up.
> Simple fix. Well simple parts, but PITA to do. If you are having a
whistling
> sound at highway speeds when feathering the gas pedal, that is a sure sign
> of it, that being said if it goes on long enough the whistling will go
away.
> Got the t-shirt.
> Rich Harris
>
>
> "DougW" <post.replies@invalid.address> wrote in message
> news:Peb_g.36208$iA5.27353@dukeread11...
> > Les wrote:
> >
> >> Cool, but its time to talk dummy language...
> >>
> >> How does that table convert to an Ohms reading? My gauge (old needle
> >> type) read from 0 to 1K.
> >
> > The table is in ohms, 0-1k is 0-1000. There is probably a scale setting
> > on your meter. Look for 10k or 100k. Worst off you can get a cheap
> > digital
> > meter at RadioShack, AutoZone, PepBoys, etc.
> >
> >
> >> Great Web Site!
> >
> >
> >
>
>



--
Posted via a free Usenet account from http://www.teranews.com

Re: Running Rich - 92-4.0L
 

"Enrich."

Earle

"Rich" <harrisfam1988@verizon.net> wrote in message
news:SGq0h.23$gf5.22@trndny01...
> I know I just stepped in on this one and it may have been suggested
already,
> but I had a leaking exhaust manifold gasket. The air coming in (yes it did
> that) makes the O2 sensor think the engine is running lean and tells the
> computer to richen (is that a real word?) the mixture. After replacing the
> gasket and cleaning the sensor, my jeep ran better and mileage came back
up.
> Simple fix. Well simple parts, but PITA to do. If you are having a
whistling
> sound at highway speeds when feathering the gas pedal, that is a sure sign
> of it, that being said if it goes on long enough the whistling will go
away.
> Got the t-shirt.
> Rich Harris
>
>
> "DougW" <post.replies@invalid.address> wrote in message
> news:Peb_g.36208$iA5.27353@dukeread11...
> > Les wrote:
> >
> >> Cool, but its time to talk dummy language...
> >>
> >> How does that table convert to an Ohms reading? My gauge (old needle
> >> type) read from 0 to 1K.
> >
> > The table is in ohms, 0-1k is 0-1000. There is probably a scale setting
> > on your meter. Look for 10k or 100k. Worst off you can get a cheap
> > digital
> > meter at RadioShack, AutoZone, PepBoys, etc.
> >
> >
> >> Great Web Site!
> >
> >
> >
>
>



--
Posted via a free Usenet account from http://www.teranews.com

Re: Running Rich - 92-4.0L
 

"Enrich."

Earle

"Rich" <harrisfam1988@verizon.net> wrote in message
news:SGq0h.23$gf5.22@trndny01...
> I know I just stepped in on this one and it may have been suggested
already,
> but I had a leaking exhaust manifold gasket. The air coming in (yes it did
> that) makes the O2 sensor think the engine is running lean and tells the
> computer to richen (is that a real word?) the mixture. After replacing the
> gasket and cleaning the sensor, my jeep ran better and mileage came back
up.
> Simple fix. Well simple parts, but PITA to do. If you are having a
whistling
> sound at highway speeds when feathering the gas pedal, that is a sure sign
> of it, that being said if it goes on long enough the whistling will go
away.
> Got the t-shirt.
> Rich Harris
>
>
> "DougW" <post.replies@invalid.address> wrote in message
> news:Peb_g.36208$iA5.27353@dukeread11...
> > Les wrote:
> >
> >> Cool, but its time to talk dummy language...
> >>
> >> How does that table convert to an Ohms reading? My gauge (old needle
> >> type) read from 0 to 1K.
> >
> > The table is in ohms, 0-1k is 0-1000. There is probably a scale setting
> > on your meter. Look for 10k or 100k. Worst off you can get a cheap
> > digital
> > meter at RadioShack, AutoZone, PepBoys, etc.
> >
> >
> >> Great Web Site!
> >
> >
> >
>
>



--
Posted via a free Usenet account from http://www.teranews.com