Logged 1st run :) ...but have 1st issue :(

[1DangerousV6]

the battery for the laptop finally came so i took the car for a spin to log a run..it was NA..just me punching it up to about 60mph..i noticed everything working fine except the IAT sensor..it doesnt move AT ALL..just sits at -38*..whats the deal with at??..should i replace the sensor?..also..at one point in the run i got as much as 3* of knock..is that bad?..i dont know whats normal..could it be from the lack of IAT sensor?..thanks! [img]smile.gif[/img]

[andrew.brandon]

AIT stands for air intake temp sensor. if its 38 below up there in new york then why would it get warmer in the 1-2 feet of your intake before it hits your sensor

[AlienInv8r]

Do you have an SLP temp module, or an IAT resistor or anything? Intense could have also edited that value from the file you ordered from them awhile back. I know when I've autotap'd my car in the past it will read a straight 41* due to the temperature module in my car. Sounds like maybe you have something similar installed.

[1DangerousV6]

no its nice up here..like 40* ..but the IAT sensor doesnt move at all..its like its not even hooked up..i had a problem with it a while ago..i pulled the wires out the back by accident when i was working on the car..i hooked the wires back up and everything but didnt realize there was still a problem..i think that might be causing it..i'll just get a new pig tail and sensor for like $20 and see if that takes care of it..its pretty cheap and that will eliminate it being the sensor..but would that cause the 3* of knock i saw?..or is that normal?..thanks guys!

[foff667]

well if your sensor is telling the computer its neg 38 degrees its probably adding a good bit of timing that could be your cause.

[98Camaro3.8]

You should be getting an SES light from that IAT. Anything below -29° will set a code.

The IAT sensor has so little control over timing, I doubt that's it. It only retards the timing like a couple degrees when it's hot out.

Can you post the whole log so we can see it?

[Little G]

Just a thought. Did you see if there were any trouble codes displayed? If you have a lower temp stat, you may be throwing a thermostat code which would cause your temp gauge not to work.

[1DangerousV6]

yup..i've been shutting it off so much lately i just set it to not turn the light on..i can post a log tomorrow..my gf is using the laptop for school right now..id like to post one anyway just to see what all you tuners think of the #s..but basically everything is working fine..injectors, o2s, MAF, etc..except the IAT sits still at -38 (which is the lowest on that gauge)..and of course the things this might possibly be effecting..i just bought a new sensor and have the pig tail connector on the way..im thinkin that should do it..i'll post a log tomorrow and then one after i fix the sensor [img]smile.gif[/img]

[Sparticus]

Get a new IAT sensor and be done with it.. It only costs $10 max

[tdz16]

when a sensor reads -38,-39, or like -40 it means there's an open in the circuit. The PCM defaults to that reading. Replace the sensor and you should be good.
~Tom

[Jerriko]

Originally posted by 1DangerousV6:
no its nice up here..like 40* ..but the IAT sensor doesnt move at all..its like its not even hooked up..i had a problem with it a while ago..i pulled the wires out the back by accident when i was working on the car..i hooked the wires back up and everything but didnt realize there was still a problem..i think that might be causing it..i'll just get a new pig tail and sensor for like $20 and see if that takes care of it..its pretty cheap and that will eliminate it being the sensor..but would that cause the 3* of knock i saw?..or is that normal?..thanks guys!

Yes, replace the sensor. As already stated, a open circuit ONLY will create that type of reading. But it is not the cause of the knock, that is something else.

[1DangerousV6]

hmmmmmm..thanks..i'll have to do some more and figure it out..most of my time's been spent on the new nitrous system

[Little G]

it is the cause of the knock because the pcm is adding like 12 degrees of spark at that temp.

[1DangerousV6]

yup..i replaced the IAT sensor and harness and took the same run..the IAT and everything looked normal and knock was at 0 pretty much the whole time except for at one point when i saw .2 ..so..thats that..thanks guys [img]smile.gif[/img]

[Little G]

Originally posted by Little G:
it is the cause of the knock because the pcm is adding like 12 degrees of spark at that temp.

I looked it up and the ECT sensor will cause this kind of spark advance. The IAT will only add about 3 degrees, in it's extremes. So there may be another issue causing your knock.