Tricked IAT Sensor
#1
Tricked IAT Sensor
Well with all this hot weather, a couple of weeks ago I decided to try the resistor trick with my Intake Air Temperature sensor.
I bought a .50 cent 4.2 K ohm 1/2 watt resistor and plugged it into the wiring harness that used to connect to the stock IAT sensor.
It is supposed to trick the PCM into thinking the air temp is 58 F and give an extra 1 1/2 degrees of timing advance.
I don't have an Autotap but there haven't been any problems or lights / codes flashing.
The Bonne seems to be running great. even with 90 F outside temps.
Has anyone tried this trick and tested it with a scan tool ? Dbtk2 ?
I bought a .50 cent 4.2 K ohm 1/2 watt resistor and plugged it into the wiring harness that used to connect to the stock IAT sensor.
It is supposed to trick the PCM into thinking the air temp is 58 F and give an extra 1 1/2 degrees of timing advance.
I don't have an Autotap but there haven't been any problems or lights / codes flashing.
The Bonne seems to be running great. even with 90 F outside temps.
Has anyone tried this trick and tested it with a scan tool ? Dbtk2 ?
#3
Junior Member
Posts like a Ricer Type-R
You can't trick your MAF and O2 sensors. Your PCM will outsmart you in time. That resistor was cheap anyway. All these sensor inputs work together. Trick them all, or don't bother.
#5
Senior Member
True Car Nut
Join Date: May 2003
Location: Holt, MI & Lima, OH
Posts: 3,022
Likes: 0
Received 0 Likes
on
0 Posts
Well with all this hot weather, a couple of weeks ago I decided to try the resistor trick with my Intake Air Temperature sensor.
I bought a .50 cent 4.2 K ohm 1/2 watt resistor and plugged it into the wiring harness that used to connect to the stock IAT sensor.
It is supposed to trick the PCM into thinking the air temp is 58 F and give an extra 1 1/2 degrees of timing advance.
I don't have an Autotap but there haven't been any problems or lights / codes flashing.
The Bonne seems to be running great. even with 90 F outside temps.
Has anyone tried this trick and tested it with a scan tool ? Dbtk2 ?
I bought a .50 cent 4.2 K ohm 1/2 watt resistor and plugged it into the wiring harness that used to connect to the stock IAT sensor.
It is supposed to trick the PCM into thinking the air temp is 58 F and give an extra 1 1/2 degrees of timing advance.
I don't have an Autotap but there haven't been any problems or lights / codes flashing.
The Bonne seems to be running great. even with 90 F outside temps.
Has anyone tried this trick and tested it with a scan tool ? Dbtk2 ?
#6
Senior Member
Posts like a Corvette
Join Date: Apr 2003
Location: Monticello, Minnesota
Posts: 1,520
Likes: 0
Received 0 Likes
on
0 Posts
doesnt that just make it run leaner or richer? because of the air temp that it thinks is coming in to the actual air temp comin in? isnt htat what you told me will?
#7
Senior Member
True Car Nut
Join Date: May 2003
Location: Holt, MI & Lima, OH
Posts: 3,022
Likes: 0
Received 0 Likes
on
0 Posts
doesnt that just make it run leaner or richer? because of the air temp that it thinks is coming in to the actual air temp comin in?
#8
Senior Member
True Car Nut
Join Date: Sep 2002
Location: Genoa, Illinois
Posts: 4,013
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by dbtk2
doesnt that just make it run leaner or richer? because of the air temp that it thinks is coming in to the actual air temp comin in?
#9
Junior Member
Posts like a Ricer Type-R
dbtk, I won't rip on you for buying one. I would have, if I hadn't known what I know first.....or seen someone else learn the hard way. For a quick track run, I can see the benefits. Absolutely. For that reason, I'd do what you did. Put them on the shelf and save them.
Just out of curiosity, what'* the resistor value on them? I'm assuming about 6 or 7k?
For anyone else considering this mod, if you INSIST on doing it, don't buy the crap off of ebay. Buy a resistor and do it yourself, but I'd suggest buying a scantool first. You'll need it, or you won't know what'* going on.
One of the things I was considering was a 'bypass switch' in the cockpit. Flip it to bypass, it inserts a resistance in place of the IAT. For everyday driving, leave it in the IAT mode. Running it full-time isn't practical.
Just out of curiosity, what'* the resistor value on them? I'm assuming about 6 or 7k?
For anyone else considering this mod, if you INSIST on doing it, don't buy the crap off of ebay. Buy a resistor and do it yourself, but I'd suggest buying a scantool first. You'll need it, or you won't know what'* going on.
One of the things I was considering was a 'bypass switch' in the cockpit. Flip it to bypass, it inserts a resistance in place of the IAT. For everyday driving, leave it in the IAT mode. Running it full-time isn't practical.
#10
I could do some more testing, because I really wasn't trying to figure out what the exact differences were with or without it, but I can if you guys want. But, I would think that if you weren't getting KR, and weren't seeing full ignition timing (which you usally aren't), it could give you ~5hp. If you know your car isn't getting full timing, and isn't getting KR, then it would be a good mod, but if your car is getting full timing, or is getting KR it won't help, and if it is getting KR it will probably hurt a little.
When I first heard of this trick, it was recommended as something to do only for a quick track run. I didn't know that the PCM would eventually learn to ignore it if left in for a long time.
[/quote]Just out of curiosity, what'* the resistor value on them? I'm assuming about 6 or 7k?
4.2 k ohm 1/2 watt