Need help - 3800 AC fix

[02BlueGT]

well la tee freakin dah!! DHP>hpt

btw awesome magnet...sorta thinkin im goin...someone has to be the guy to call you edsel in front of yer soon be be larger family.
Al's comming over tonight i was gonna ask him if him and the mama are going...see if i can sponge a ride off him so i can get nice n plastered

You could walk bro

 

[Turbocharged400sbc]

walk? my fatass aint walkin

al wants to take his woman so it may be me and them...

 

[Angus]

Got my new auto dim and compass mirror on yesterday.

Now I have a slow response code for bank 1, sensor 1 o2 sensor. So I ordered a Denso replacement sensor as well as a new iat sensor.

Now to put in the new iat sensor, can I just leave it on top of the engine? Would the higher temps it's seeing be problematic and mess with the tune in any way?

If so, I'm guessing it then would be best to just wire the sensor to in front of the radiator, but I don't want to do any wire work if it's not needed.

 

[Mook]

the front o2 sensor was brand new...i think it was even a denso.

 

[daturbosix]

I HAVE THAT DENSO SENSOR UNDER WARRENTY!

 

[Angus]

Well that's good news.

 

[daturbosix]

ideally, you want the IAT sensor in the intake track. like on my ttype, i drilled and tapped a hole in my upper intake housing and screwed it in there. those are *ACTUAL* readings it will see now...

if you have that option, thats what i would do.

 

[Alacran]

Got my new auto dim and compass mirror on yesterday.

Now I have a slow response code for bank 1, sensor 1 o2 sensor. So I ordered a Denso replacement sensor as well as a new iat sensor.

Now to put in the new iat sensor, can I just leave it on top of the engine? Would the higher temps it's seeing be problematic and mess with the tune in any way?

If so, I'm guessing it then would be best to just wire the sensor to in front of the radiator, but I don't want to do any wire work if it's not needed.

Angus dont nmskull it. (too soon?)

check the O2 sensor for contamination when you take it out. Check the wiring too. I am guessing headers are installed.

Also, can you measure the resistance of the IAT sensor? the idea is to make sure the problem is in the sensor and not in the wiring.

 

[Bob Kazamakis]

TURB-O

 

[Angus]

Angus dont nmskull it. (too soon?)

check the O2 sensor for contamination when you take it out. Check the wiring too. I am guessing headers are installed.

Also, can you measure the resistance of the IAT sensor? the idea is to make sure the problem is in the sensor and not in the wiring.

Wha? I'll check the sensor, but if I have a warranty on it, I'm going to replace it anyways and then see if it comes back on.

Also, there currently is no IAT sensor.

 

[Angus]

AFter my second trip to Advanced, I finally got a new iat sensor in there and drove home with the sensor open and hanging out right above the uim.

AC WORKED!

It was reading intake temps of 180*F though And maybe it was just me, but the car felt like it had lost a good amount of power just driving normally and I don't know if that's b/c of the iat temps, the bad o2 sensor, or just the ac compressor in use.

I'll be relocating the iat sensor this weekend.

 

[Fish]

Thats good that you know what the AC problem was. I would for sure see what you could do about the IAT mounting.

Also, Delco>Denso.

 

[TommyGloves]

ideally, you want the IAT sensor in the intake track. like on my ttype, i drilled and tapped a hole in my upper intake housing and screwed it in there. those are *ACTUAL* readings it will see now...

if you have that option, thats what i would do.

x2

(having the IAT read 180* is going to play havoc with your tune.)

 

[smug]

probably pulling ass loads of timing

 

[BLUBYU2]

Get yourself a delco unit trust me worth the money. I threw many o2 lights with a denso when I had the car. Iat in the free air will help with the low power issue.


---
I am here: http://maps.google.com/maps?ll=41.911270,-87.878136

 

[Mook]

delco ftw.

 

[Alacran]

Thats good that you know what the AC problem was. I would for sure see what you could do about the IAT mounting.

Also, Delco>Denso.

Maybe they switch suppliers but i bought an AC delco that looked identical to Denso. The Denso that came in the delco box has been running fine even with race fuel. Also, the stock sensor looked like the Bosch sensor that everyone complains about.

So, when i bought mine Delco=Denso. Delco did them thing with oil filters.

Nick

 

[10sec]

I don't understand how the IAT effected the a/c. I didn't have one in the blue car and don't have one in the red car and the a/c still works. The OUTSIDE temp sensor is what effects the A/C as far as i've experienced. Also, i wouldn't drill a hole in the i/c pipes to read IAT's. The tune is set to not pull timing no matter what the IAT reads so putting an IAT on the car will have no effect on the tune, nor provide anything useful to the car aside from putting a hole in a pipe for no reason. Car felt slow because of the a/c and the fact that you had 180° under hood temps.

 

[Angus]

I don't understand how the IAT effected the a/c. I didn't have one in the blue car and don't have one in the red car and the a/c still works. The OUTSIDE temp sensor is what effects the A/C as far as i've experienced. Also, i wouldn't drill a hole in the i/c pipes to read IAT's. The tune is set to not pull timing no matter what the IAT reads so putting an IAT on the car will have no effect on the tune, nor provide anything useful to the car aside from putting a hole in a pipe for no reason. Car felt slow because of the a/c and the fact that you had 180° under hood temps.

I'm happy with the $12 fix though and if the iat temp is tuned out, I now have a new under hood temp reading to watch


I bet GM uses iat temps to control the ac b/c I'm guessing that not all GP's (or GM's for that matter) have that ambient air temp sensor in front from the factory... I found this on it too: http://www.4s.com/Upload/Four Seasons/documents/Tech Tips/English/4S 385 GM IAT AND AC.PDF

 

[Alacran]

The OUTSIDE temp sensor is what effects the A/C as far as i've experienced.

This is true on the digital HVAC unit. Also, when the outside temp sensor fails it is easy to spot or detect, a reading of -38 on day like today will be obvious.

 

[02BlueGT]

I don't understand how the IAT effected the a/c. I didn't have one in the blue car and don't have one in the red car and the a/c still works. The OUTSIDE temp sensor is what effects the A/C as far as i've experienced. Also, i wouldn't drill a hole in the i/c pipes to read IAT's. The tune is set to not pull timing no matter what the IAT reads so putting an IAT on the car will have no effect on the tune, nor provide anything useful to the car aside from putting a hole in a pipe for no reason. Car felt slow because of the a/c and the fact that you had 180° under hood temps.

My tune has an "AC enable minimum IAT".... so yeah, def can have an effect

 

[10sec]

Still didn't do it on my '02, a/c was colder than a witches titty.

 

[02BlueGT]

Still didn't do it on my '02, a/c was colder than a witches titty.

... stock setting is 60*

 

[10sec]

Interesting. Seems as though you guys are suckers

 

[Handsome Jesus]

never heard of problems with Denso sensors... never had problems with them either. they have a more open element as well, so readings should be faster (not like NB readings are worth much anyway)