IET sensor?

[89 Stroker]

truck is at the dealer getting the no start diagnosed , i have a diy 6637 intake on it and they keep telling me i need the stock intake because it had a sensor in it telling the truck what the air was outside? there was no wires going to the intake even when it was stock , he tells me that the truck is reading -40 degree outside all the time and that is why the truck is having trouble starting because that sensor is not on the intake even though it was never there to begin with

does this make sense?

 

[Bugman]

Mine has been disconnected since 99 and no problems starting except for when the glow plug relay went out.

 

[89 Stroker]

Yea bugman they keep telling me to bring the stock In take down if I have it because that's what is somewhat causing my no start cause the truck is reading it's -40 below , even tho the one that use to be on the truck never had that on let alone plugged in

 

[co04cobra]

Go get the truck from that dealer FAST!!!

 

[JD3020]

^What he said, although i don't see the point in disconnecting or abandoning it. I just threw mine in the hole in the fenderwell, out of sight yet the PCM is still happy.

 

[89 Stroker]

Gonna go down there tommorow morning , does it make sense To you guys when he said that could be why it won't start? Because the truck is reading -40 at all times? He did say that my gpr is losing a complete volt when key is on , I had a feeling the gpr was bad or something was up with it , he did say that there are some sensors that need to be changed , he quoted me 1400 for everything and installed but I'm not doing that

 

[co04cobra]

Unplugged or not there the IAT will default to -40. Sometimes the PCM will have a problem that they won't recognize a IAT and it defaults to -40. Still no big deal. Does not change how it starts. And losing a full volt? Across the gpr? That also does not denote a bad gpr. Sounds like this is the first 7.3 this dealer has EVER worked on. Take it from them because they are not going to be able to diagnosis and fix chit....

 

[89 Stroker]

Unplugged or not there the IAT will default to -40. Sometimes the PCM will have a problem that they won't recognize a IAT and it defaults to -40. Still no big deal. Does not change how it starts. And losing a full volt? Across the gpr? That also does not denote a bad gpr. Sounds like this is the first 7.3 this dealer has EVER worked on. Take it from them because they are not going to be able to diagnosis and fix chit....

Is losing a complete volt a lot in the sense of warming the glow plugs? I know there is a connection issue cause when the key is on sometimes it will rapidly start to click then stop after about a second , I will know more tommorow , there was something else he talked about that contributed to the no start but I forgot

 

[Patrick Feeley]

If the voltage drop across the GPR is 1.0V, that is significant. Get a Stancor (now White-Rodgers) 586-902 or a Western Plow 56131K-1. W-R is about $50 and the WP is about $15. I've never heard of the IAT defaulting to -40F, which would be stupid if that's what it actually did. Cheers!

 

[89 Stroker]

got it back from the dealer

ended up having the iat off the old intake to i wired that up , cleaned the ebp tube and sensor , they told me the sensor is bad , truck seems to idle smoother now for some reason , started up every time yesterday , gonna get a gpr from napa today since mine is bad.

 

[Bugman]

Do not get one from NAPA or you will be replacing it in 6 months. Get either the White/Rodgers or the Western Plow relay that in listed in Patrick's post.

Just google them and go with the cheapest supplier.

 

[co04cobra]

It does default to -40 when missing or PCM can't/doesn't see a iat. I have had at least 2 pcms over the years that have had a internal problem and they would default to -40. Switched them to at least 5 different trucks testing.

The volt drop is noteworthy, but also will not cause his issue unless it's under 50* where the truck is at. The IAT sensor has almost nothing to do with starting. Now the EOT would be a different story. The better idle is probably bc of the cleaned ebp tube and sensor.

I also agree to not get a gpr from napa.

 

[89 Stroker]

i went ahead and just got one for napa only because it was like 25 bucks , the one on the truck was bad so it was not helping things at all , i did clean out the ebp tube and cleaned the sensor , the dealer told me it was bad but idk , still getting the iat sensor code , a ebp code and ebpv code , the wires the tech showed that are supposed to be the iat wires dont even have power going to them even with the key on with the key on , seems to still be starting on its own so we will see