Inlet air temp sensor and pinging???
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Senior User
Joined: Nov 2007
Posts: 179
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From: Texas
Inlet air temp sensor and pinging???
My pinging came back a couple of weeks ago. So I did what I did last time to get rid of it. I disconected the battery and cleaned the MAF. It didn't work this time. I have a V-10 Excursion.
Get this. Since I am in the D/FW area, winter in Nov/Dec is a little on and off. One day it is pinging like crazy, the next day....not one bit. The difference?
When it wasn't pinging, it was about 70 degrees. Same tank of gas, same everything.
Then it got cold again. Pinging came back. Then it got warm again. Pinging gone. Same 87 octane gas. I'm literally talking one day to the next. You guys from TX know what I mean.
I bought this truck a year ago. And mostly during last winter, we were towing out travel trailer. We put in 89 octane when we tow because we get better mileage. So, there was probably a lot of mixing 89 and 87 octane, so maybe that's why I didn't notice it then. All spring and summer, no pinging. We haven't towed since Oct. So, we've been on 87 octane for a couple of months.
Is there a sensor for the temp of the incoming air that might be malfunctioning?
An O2 sensor?
Seems like some sensor is not giving the correct info to the computer.
Any ideas???????????
Get this. Since I am in the D/FW area, winter in Nov/Dec is a little on and off. One day it is pinging like crazy, the next day....not one bit. The difference?
When it wasn't pinging, it was about 70 degrees. Same tank of gas, same everything.
Then it got cold again. Pinging came back. Then it got warm again. Pinging gone. Same 87 octane gas. I'm literally talking one day to the next. You guys from TX know what I mean.
I bought this truck a year ago. And mostly during last winter, we were towing out travel trailer. We put in 89 octane when we tow because we get better mileage. So, there was probably a lot of mixing 89 and 87 octane, so maybe that's why I didn't notice it then. All spring and summer, no pinging. We haven't towed since Oct. So, we've been on 87 octane for a couple of months.
Is there a sensor for the temp of the incoming air that might be malfunctioning?
An O2 sensor?
Seems like some sensor is not giving the correct info to the computer.
Any ideas???????????
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
The IAT is in the MAF, however it's working backwards to the way I would expect it. It should ping when it's hot out and less when cold.
You can check o2 by seeing if it still pings at wide open throttle. At WOT the ECM uses open loop programming and doesn't rely on the o2 sensors as much.
You can check o2 by seeing if it still pings at wide open throttle. At WOT the ECM uses open loop programming and doesn't rely on the o2 sensors as much.
Posting Guru
Joined: Sep 2001
Posts: 1,539
Likes: 3
I'm gonna guess emissions garbage malfunctioning. Possibly an EGR issue? Not sure if any of the big name parts stores have free code scanners like we do around chicago but if you can find one with real time sensor monitoring you an look for anything that looks wacky.
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
How is your mileage? If the o2 sensors are close enough their limit they are causing this, mileage should be in the toilet. EGR is probable, dumping a lot of hot gasses back into the cylinder except under WOT.
