air temp sensor
#1
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Car: 87 IROC-Z
Engine: jasper 350
Transmission: 700R-4
Axle/Gears: 2.73 posi
air temp sensor
I don't know if anyone can help me but i am replacing my 305 for a 350. i have tranny, exhaust and some other things hooked up but what my problem is, is that i can't seem to find the plug that hooks to the air temp sensor on the bottom of the TPI plenum. I was hopeing someone could point me in the right direction to find it, for example does it come from a big coil of wires or a small. Or else just describe it as best as posssible. My car is 87 iroc-z with tune port injection.
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Car: 1985 El Camino Choo Choo
Engine: L31 Crate 350 w/ TPI
Transmission: GN 200-4r
Axle/Gears: GN 8.5 3.73
Re: air temp sensor
Others may jump in, but I'll try. There is a short "Jumper" wire that plugs into the MAT sensor. The Connector on the end is the same style as the Water Temp Connector on the front of the mainfold. This short jumper wire ( about 12-15" long) then plugs into the harness back by the distributor. IIRC, it is a 2 Prong weatherpak connector.
HTH
HTH
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Car: 87 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Dana M78 3.27 posi
Re: air temp sensor
If your already dealing with the IAT, I'd suggest doing yourself a favor and.......
Relocating the IAT properly
Relocating the IAT properly
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Car: 1990 IROC
Engine: 5.7 TPI
Transmission: T-56
Re: air temp sensor
When I tore my engine down, the connector from the mat sensor was connected to the egr solenoid. I'm not sure if that is correct but that is the way mine was hooked up. From my understanding, the sensor tells the egr valve to open and close based on the temp from the manifold.
Last edited by Kodfish; 06-09-2009 at 09:52 AM. Reason: typo
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Car: 1987 Trans Am
Engine: 355ci L98 soon to be turbo'd
Transmission: 700R4
Axle/Gears: 2.73 posi
Re: air temp sensor
If your already dealing with the IAT, I'd suggest doing yourself a favor and.......
Relocating the IAT properly
Relocating the IAT properly
#6
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Car: 87 GTA
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Re: air temp sensor
Yep. That sums it up.
My TPI IAT is still under the plenum in place. I just had the wires to it cut & extensions spliced in, to put the IAT where I wanted to.
The clip stub on the TBI one is different, but a razor blade will trim it down to fit in the TPI plug.
My TPI IAT is still under the plenum in place. I just had the wires to it cut & extensions spliced in, to put the IAT where I wanted to.
The clip stub on the TBI one is different, but a razor blade will trim it down to fit in the TPI plug.
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Car: 1987 Trans Am
Engine: 355ci L98 soon to be turbo'd
Transmission: 700R4
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Re: air temp sensor
well I got my TBI or birdcage air sensor and hopefully plan to install it this weekend when I remove the plenum to clean out and maintenance the egr... I also got the pigtail for it, so I just plan to remove the clip from the old and splice in the "new" and seal up with shrink wrap...
#9
Re: air temp sensor
hey i have a 87 iroc 350 tpi and have done alot of work on it...it runs really good and has no misfires or nothing...however after i drive my car for a litttle while or while im driving and come to a stop sign or redlight or stop...my car wants to idle down and cut off...if i dont give it gas it will bog down and shut off. i have replaced plugs, wires, cap, radiator, water pump, thermostat, fuel filter, fuel pump, fuel pump sending unit.... I have been wondering alot....i know its not getting enough air intake currently because when i rev it up it sucks in that hose a little bit in fron of the throttle body which means not enough air is flowing in i believe...but i am bout to take care of that....do u think that could be a problem...or my cadiallac converter could be causing it..... or throttle body a little clogged up..... it also seems the idle air control kicks on and it idles at about 1000 rmps it runs good idleing and isnt missing a lick but sometimes it will bog down and idle at about 600 rmps and wants to kind of cut off.....any advice please help me.....
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Car: 87 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Dana M78 3.27 posi
Re: air temp sensor
If the hose is collapsing, either it is really weak from age/abuse, or your filter really sucks (no pun intended) and not flowing enough air, causing a suction in the intake tubing, collapsing the tubing.
If you want a better IAT setup...... IAT Relocation
If you want a better IAT setup...... IAT Relocation
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Car: 86 Camaro iroc-z28
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3.42 Posi
Re: air temp sensor
other than reading accurately. what does relocation the IAT sensor do in terms of performance?
#12
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Re: air temp sensor
No only is the other sensor more accurate, but it doesn't sit in a heat soaked (plenum) location. You can relocate it to a much cooler area, allowing it to read the actual AIR, not the metal plenum.
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Car: 86 Camaro iroc-z28
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Re: air temp sensor
You answered your own question. Reads accurately. The TPI sensor is actually a WATER sensor, being used for the air reading.
No only is the other sensor more accurate, but it doesn't sit in a heat soaked (plenum) location. You can relocate it to a much cooler area, allowing it to read the actual AIR, not the metal plenum.
No only is the other sensor more accurate, but it doesn't sit in a heat soaked (plenum) location. You can relocate it to a much cooler area, allowing it to read the actual AIR, not the metal plenum.
i know . but i mean whats the big advantage to it. i mean obviously it makes sense to put the sensor somewhere where its actually useful. but by my question i meant, whats the advantage other than accuracy, yes the temperature will be for the actual air but why should a person do this to their car as opposed to putting a new sensor in the stock place and call it a day? im not saying this to attack your idea, im just asking this because im really not to sure what an intake manifold air temp sensor does, other than sense the temp. in the plenum
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Re: air temp sensor
i know . but i mean whats the big advantage to it. i mean obviously it makes sense to put the sensor somewhere where its actually useful. but by my question i meant, whats the advantage other than accuracy, yes the temperature will be for the actual air but why should a person do this to their car as opposed to putting a new sensor in the stock place and call it a day? im not saying this to attack your idea, im just asking this because im really not to sure what an intake manifold air temp sensor does, other than sense the temp. in the plenum
I had mine fail & changed it out, in the Autozone parking lot, on a hot engine. Try that with the IAT in the stock location.
I was tracking my mpg back in & noticed a 2 mpg average increase. 2mpg seems more like a variance, I know. But my average of 13-15, became 14-16. Tracking it over long term, all I can say is yes. The average mpg increased.
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Re: air temp sensor
The mat sensor is what it is really called. Its primary function that i know is to tell the ecm when to cycle the egr valve. I'm guessing relocating it will ensure better egr operation
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Car: 86 Camaro iroc-z28
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Re: air temp sensor
I don't know what answer your looking for. I think I pretty much said it all. About the only other things I can think of, us ease of sensor replacement and slight mpg increase?
I had mine fail & changed it out, in the Autozone parking lot, on a hot engine. Try that with the IAT in the stock location.
I was tracking my mpg back in & noticed a 2 mpg average increase. 2mpg seems more like a variance, I know. But my average of 13-15, became 14-16. Tracking it over long term, all I can say is yes. The average mpg increased.
I had mine fail & changed it out, in the Autozone parking lot, on a hot engine. Try that with the IAT in the stock location.
I was tracking my mpg back in & noticed a 2 mpg average increase. 2mpg seems more like a variance, I know. But my average of 13-15, became 14-16. Tracking it over long term, all I can say is yes. The average mpg increased.
yeah. thats what i was interested in. that seems like a good mod then. but my other question was , what does that sensor really do in terms of what it tells the computer. does it trim fuel?
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Re: air temp sensor
Kinda like being told you need a spacer to fit a 4th gen wheel, vs being told you need a 2 INCH spacer (which isn't 100% accurate, but what most people go with). Which tells you more? Make sense?
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Car: 86 Camaro iroc-z28
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Re: air temp sensor
The computer uses the sensors (like the IAT) to determine how much fuel to add, how much advance/retard of the timing to apply, etc.
Kinda like being told you need a spacer to fit a 4th gen wheel, vs being told you need a 2 INCH spacer (which isn't 100% accurate, but what most people go with). Which tells you more? Make sense?
Kinda like being told you need a spacer to fit a 4th gen wheel, vs being told you need a 2 INCH spacer (which isn't 100% accurate, but what most people go with). Which tells you more? Make sense?
thanks for the info. i might decide on doing this mod in the future, whenever i have my plenum off.
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Re: air temp sensor
We reached under, unplugged mine, snipped the wires, spliced in longer sections of wires, then put the new IAT where I wanted it.
You'll want to leave the old IAT in place to plug the hole, or go find a pipe plug that fits those threads.
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Car: 86 Camaro iroc-z28
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Re: air temp sensor
your right. probably some long needle nose will be able to reach under there
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