Question for Mike 76251 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

85 K5 · 05-01-2003, 06:50 PM

What sensor do you use for the air/fuel ratio, and where is the temp sensor for your tranny temp?

**swervin ervin** · 05-01-2003, 10:40 PM

Not the Mike, but a Mike never the less.

I had a AF meter in my truck at one time. Thought it was something I couldn't live without. The Autometer one no doubt. Trouble is, I still have my EGR and all emissions stuff hooked up and working. The EGR and AIR pump play havoc with the AF meter, deluting the exhaust mixture so my gauge bounced around something terrible. So I pulled it out and sold it to someone who doesn't have emissions crap on their truck, and could actually get some use out of it.

But, to get to the point. The AF ratio meter uses a O2 sensor in the exhaust , just like it would for a computer controlled vehicle, except all it's doing is sending signals back to the meter as to what it is seeing, rich or lean, or the best stowick (sp?) This is right in the middle where it should run at normal cruising.

I bought a kit from Autometer for this, which is the wiring harness and O2 sensor. Not cheap for sure. Costs way more than the gauge. I guess the reason is because it's a heated type or something like that.

*1FaastC10* · 05-01-2003, 11:41 PM

i believe its STOICH, short for "stoichiometric" i do believe.

85 K5 · 05-02-2003, 07:12 AM

Thanks for the reply. Though that would be good for carb tuning but I'm getting better mileage now than I expected. (13 highway)

Is there a tranny temp sensor that I wouldn't have to cut a hole in the oil pan for?

Mike76251 · 05-02-2003, 11:24 AM

I used a Bosch one wire (non-heated) O2 sensor and mounted it aft of the header collector with a metric weld bung (18?) I got at a bolt and screw place.
The tranny temp sensor came with the guage and mounts in a remote oil filter housing on my fender well. You can see the temp fitting between the two stainless lines coming out of the filter mount,

rockman20 · 05-02-2003, 11:44 AM

This isn't on my truck, but is on my 69 Cutlass. I have both tha A/F and the transmission temp.

The A/F is the Autometer Phantom one. Spendy, but I have all Phantom gauges so I wanted it to match.

I placed the sensor at the very end of the header collector. If I had it to do over again, I would probably move it a bit closer to the primary tubes. Even though I have a heated O2 sensor, it seems like at idle it cools off enough not to read after a while.

The meter is nice, but not necessary if you don't plan on changing things a lot. If you have a nice digital multimeter, you can do this with a cheap O2 sensor (one wire). Weld the bung in the exhaust and put in the sensor. Run the wire up into the car and then hook it to your voltmeter and run the car. With a non heated sensor, it will take a while, but soon you will see your voltmeter move.

The O2 sensor only puts out something like 1 volt max. But there is a chart somewhere that tells you what the voltages mean as far as lean or rich or stoich. If someone wants to go this route, let me know and I will scrounge up those documents. Once you get the carb and timing tuned, you can remove the O2 sensor and everything is clean again. Or leave it in and just hang the wire under the truck somewhere in case you want to use it for future use.

Since I am always adjusting mixture, timing, heads, etc, etc, I decided to go with the gauge just so I always have it. Makes a great conversation piece as well!

rockman20 · 05-02-2003, 11:45 AM

Oh yea, the transmission temp. I have a TH350 on my Cutlass. There was a small plug on the passenger side of the transmission. I took the plug out and found oil behind it. And just so happens that the sending unit was the same size so I screwed the sending unit in there and it works great. No drilling or tapping of the pan needed.

79BIG10 · 05-02-2003, 12:32 PM

Please tell me that's not a Fram oil filter

PHOENIX · 05-02-2003, 12:56 PM

Is measuring the temperature there at the filter as accurate as it should be? When the fluid is travelling through the lines on the way to the filter Im sure it cools down some from wind hitting the line.

Everyone else with tranny temp, where did you install the sending unit? On the tranny itself or in the pan?
Just curious as its something I would do if I put in automatic in.

MylilBowTie · 05-02-2003, 01:26 PM

I would put the transmission sending unit in the transmission pan.

TIMSPEED · 05-02-2003, 01:52 PM

I'm doing that A/F Ratio mod today! I'm getting an "Anti-Fouling Plug Adapter" from Kragens for $4, and having it welded in JUST after the header collector. Although I'm not hooking up an A/F Ratio Meter, I am having my friend who has a WideBand O² Sensor, hook it up and we're going to tune the carb to be Stoich @ idle/cruise/WOT.

It's nice to have friends with such expensive toys

BTW: On that Tranny temp sender, I personally would put it in the pan.

**swervin ervin** · 05-02-2003, 02:28 PM

I used a mechanical tranny temp gauge and installed it in the pan. I'm guessing this location is a true indication of fluid temps. I would also guess, if it's installed in the cooler out line, it would be the best indication of fluid temps. This would probably be the highest temps the fluid would see.

But, with this mechanical gauge, I see no way of putting it in the line, or any place else for that matter. The bulb (sensor) on the end of the tube is big, about 2" long. No other way I could see but to put it in the pan.

Works for me anyway.

**swervin ervin** · 05-02-2003, 02:31 PM

Oh, and Tim, no way to have it stoich at idle, cruise, and WOT. It ain't going to happen. Where you are concerned about is idle/cruise, mostly cruise. A good idle isn't hard to obtain.

WOT, forget about stoich. It will be full rich.

Mike76251 · 05-02-2003, 08:14 PM

Quote:

Originally posted by 79BIG10
Please tell me that's not a Fram oil filter

Fram HP-1 Racing Filter avalible at Autozone, Kragen,Advance, and Walmart.

79BIG10 · 05-03-2003, 05:20 AM

Quote:

Originally posted by Mike76251

Fram HP-1 Racing Filter avalible at Autozone, Kragen,Advance, and Walmart.

I was die hard Fram guy as well till I read this. http://www.frankhunt.com/FRANK/corve...lterstudy.html

Mike76251 · 05-03-2003, 10:06 AM

Thanks Brandon,
Good reading indeed!!

Gotta hook in the printer for those pages!

Mike

05-01-2003, 06:50 PM	#1
85 K5 Registered User Join Date: Nov 2002 Location: Spring TX Posts: 113	Question for Mike 76251 What sensor do you use for the air/fuel ratio, and where is the temp sensor for your tranny temp? __________________ 350 Crate 10 bolt 3.73 2.5 lift 32x11.50 1904 Edelbrock http://www.oplnk.net/~spirit/K5front.jpg

05-01-2003, 10:40 PM	#2
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Not the Mike, but a Mike never the less. I had a AF meter in my truck at one time. Thought it was something I couldn't live without. The Autometer one no doubt. Trouble is, I still have my EGR and all emissions stuff hooked up and working. The EGR and AIR pump play havoc with the AF meter, deluting the exhaust mixture so my gauge bounced around something terrible. So I pulled it out and sold it to someone who doesn't have emissions crap on their truck, and could actually get some use out of it. But, to get to the point. The AF ratio meter uses a O2 sensor in the exhaust , just like it would for a computer controlled vehicle, except all it's doing is sending signals back to the meter as to what it is seeing, rich or lean, or the best stowick (sp?) This is right in the middle where it should run at normal cruising. I bought a kit from Autometer for this, which is the wiring harness and O2 sensor. Not cheap for sure. Costs way more than the gauge. I guess the reason is because it's a heated type or something like that. __________________ Mike 1985 Chevy C-10

05-02-2003, 07:12 AM	#4
85 K5 Registered User Join Date: Nov 2002 Location: Spring TX Posts: 113	Thanks for the reply. Though that would be good for carb tuning but I'm getting better mileage now than I expected. (13 highway) Is there a tranny temp sensor that I wouldn't have to cut a hole in the oil pan for? __________________ 350 Crate 10 bolt 3.73 2.5 lift 32x11.50 1904 Edelbrock http://www.oplnk.net/~spirit/K5front.jpg

05-02-2003, 11:24 AM	#5
Mike76251 Senior Member Join Date: Mar 2003 Posts: 2,500	I used a Bosch one wire (non-heated) O2 sensor and mounted it aft of the header collector with a metric weld bung (18?) I got at a bolt and screw place. The tranny temp sensor came with the guage and mounts in a remote oil filter housing on my fender well. You can see the temp fitting between the two stainless lines coming out of the filter mount, Attached Images

05-02-2003, 11:44 AM	#6
rockman20 "The dude abides" Join Date: Apr 2003 Location: North Dakota Posts: 472	This isn't on my truck, but is on my 69 Cutlass. I have both tha A/F and the transmission temp. The A/F is the Autometer Phantom one. Spendy, but I have all Phantom gauges so I wanted it to match. I placed the sensor at the very end of the header collector. If I had it to do over again, I would probably move it a bit closer to the primary tubes. Even though I have a heated O2 sensor, it seems like at idle it cools off enough not to read after a while. The meter is nice, but not necessary if you don't plan on changing things a lot. If you have a nice digital multimeter, you can do this with a cheap O2 sensor (one wire). Weld the bung in the exhaust and put in the sensor. Run the wire up into the car and then hook it to your voltmeter and run the car. With a non heated sensor, it will take a while, but soon you will see your voltmeter move. The O2 sensor only puts out something like 1 volt max. But there is a chart somewhere that tells you what the voltages mean as far as lean or rich or stoich. If someone wants to go this route, let me know and I will scrounge up those documents. Once you get the carb and timing tuned, you can remove the O2 sensor and everything is clean again. Or leave it in and just hang the wire under the truck somewhere in case you want to use it for future use. Since I am always adjusting mixture, timing, heads, etc, etc, I decided to go with the gauge just so I always have it. Makes a great conversation piece as well! __________________ RockMan 1993 Chevy Silverado C3500 1 ton dually 1994 Honda Civic 1969 Oldsmobile Cutlass S 1953 IH Farmall Super M New to the fleet: 1992 Subaru Loyal

05-01-2003, 11:41 PM	#3
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,400	i believe its STOICH, short for "stoichiometric" i do believe.

05-02-2003, 11:45 AM	#7
rockman20 "The dude abides" Join Date: Apr 2003 Location: North Dakota Posts: 472	Oh yea, the transmission temp. I have a TH350 on my Cutlass. There was a small plug on the passenger side of the transmission. I took the plug out and found oil behind it. And just so happens that the sending unit was the same size so I screwed the sending unit in there and it works great. No drilling or tapping of the pan needed. __________________ RockMan 1993 Chevy Silverado C3500 1 ton dually 1994 Honda Civic 1969 Oldsmobile Cutlass S 1953 IH Farmall Super M New to the fleet: 1992 Subaru Loyal

05-02-2003, 12:32 PM	#8
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,775	Please tell me that's not a Fram oil filter __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

05-02-2003, 12:56 PM	#9
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	Is measuring the temperature there at the filter as accurate as it should be? When the fluid is travelling through the lines on the way to the filter Im sure it cools down some from wind hitting the line. Everyone else with tranny temp, where did you install the sending unit? On the tranny itself or in the pan? Just curious as its something I would do if I put in automatic in. __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION *

05-02-2003, 01:26 PM	#10
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	I would put the transmission sending unit in the transmission pan. __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

05-02-2003, 01:52 PM	#11
TIMSPEED Join Date: Jan 2003 Location: Modesto, CA Posts: 1,321	I'm doing that A/F Ratio mod today! I'm getting an "Anti-Fouling Plug Adapter" from Kragens for $4, and having it welded in JUST after the header collector. Although I'm not hooking up an A/F Ratio Meter, I am having my friend who has a WideBand O² Sensor, hook it up and we're going to tune the carb to be Stoich @ idle/cruise/WOT. It's nice to have friends with such expensive toys BTW: On that Tranny temp sender, I personally would put it in the pan. __________________ I have a few cars... See Them Here

05-02-2003, 02:28 PM	#12
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	I used a mechanical tranny temp gauge and installed it in the pan. I'm guessing this location is a true indication of fluid temps. I would also guess, if it's installed in the cooler out line, it would be the best indication of fluid temps. This would probably be the highest temps the fluid would see. But, with this mechanical gauge, I see no way of putting it in the line, or any place else for that matter. The bulb (sensor) on the end of the tube is big, about 2" long. No other way I could see but to put it in the pan. Works for me anyway. __________________ Mike 1985 Chevy C-10

05-02-2003, 02:31 PM	#13
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Oh, and Tim, no way to have it stoich at idle, cruise, and WOT. It ain't going to happen. Where you are concerned about is idle/cruise, mostly cruise. A good idle isn't hard to obtain. WOT, forget about stoich. It will be full rich. __________________ Mike 1985 Chevy C-10

05-03-2003, 10:06 AM	#16
Mike76251 Senior Member Join Date: Mar 2003 Posts: 2,500	Thanks Brandon, Good reading indeed!! Gotta hook in the printer for those pages! Mike



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