Check your TB and make sure the bask side of it is clean as well as the mouth of the intake. How much oil are you using? Ever noticed any blow back gasses?

 

The water testing procedure on the IAT may work, but depending on the thermocouple type, you could short it out with this method, and all your readings would be bunk. You might try room temp air vs canned air (flip the can and douse it with the liquid for a cold reading) and a heat gun or blow dryer. that should give you the temp swing to see if the IAT is working without potentially shorting the thermocouple.

nateroach

 

BTW, those IAT sensors arent but a few dollars think from Autozone.

 

Well I just put this engine in as a reman. So I transffered al ot of parts from the old one to the new. Once I got everything up and running I got a engine light on. I tried all fixs that are for the code p1391 and none of them work. So I think I have different problem that is triggering the light to come on.

 

I just replaced the Iat and added seafoam to the gas and put some threw the brake booster line. It seemed to help but the problem is still there.

 

What do you mean by blow back gasses? It does seem to sound like it back fires.

 

According to this site I have fuel delivery problem. http://www.aa1car.com/library/vacleak.htm

I will post up a video of the stft and ltft scan. When I was at idle the stft went all the way up to 18.7% and when I gave it gas to around 2000 rpm's. The stft went up to as high as 27.7% and the ltft was at -9.6% which I think would cause a lean condition. Now what would cause this to happen?

 

I understand what you are asking about LT/STFTs but IDK the impact vacuum leaks may have if any. However, checking for a vacuum leak can be easy if you can get the engine running. With it running simply spray carb cleaner around the intake, vacuum lines and accessories to see if the idle changes. If so then you have a vacuum leak. If no change then you do not have one.

 

I am gonna start a new thread on this topic.

Thanks for helping me.