IAT sensor???
Thread Starter
|
New User
Joined: Jan 2007
Posts: 9
Likes: 0
From: Columbus, OH
IAT sensor???
I have an '01 Sport Trac with the 4.0 SOHC engine. According to the repair manual I bought, there is an Intake Air Temp (IAT) sensor that should be located in the intake tube, between the air box and the throttle body, and close to the MAF sensor. I looked, but there is no such sensor on my intake tube. Since I am having a cold start issue, I wanted to verify that this sensor was working, but I can't locate it. Could it be part of the MAF???
Thread Starter
|
New User
Joined: Jan 2007
Posts: 9
Likes: 0
From: Columbus, OH
The only sensors on or near that inlet tube/throttle body that I can find are the throttle position sensor, the MAF, and the idle air control valve. Below the throttle body is the coolant temp sensor and the sending unit for the temp gauge. I've identified these according to the pics in the repair manual, but the IAT sensor is just not where it shows it to be. I just wondered if maybe Ford decided to combine it with the MAF somehow, because the picture shows the two being right next to each other on the intake tube.
Postmaster
Joined: Oct 2003
Posts: 4,516
Likes: 1
From: SoCal
Yeah, they must have moved it then. Maybe inside the air filter housing?
But if the IAT was bad you should get a check engine light and an IAT trouble code.
Is it slow to start? Could be a weak fuel pump if thats the case.
If thats the problem try cycling the key to run for 2 seconds then off. Repeat 5 times & see how it starts.
But if the IAT was bad you should get a check engine light and an IAT trouble code.
Is it slow to start? Could be a weak fuel pump if thats the case.
If thats the problem try cycling the key to run for 2 seconds then off. Repeat 5 times & see how it starts.
Thread Starter
|
New User
Joined: Jan 2007
Posts: 9
Likes: 0
From: Columbus, OH
Yeah, all good suggestions. I'll check the air filter housing. I went to the local parts store and they list an IAT sensor for my year and model. I was able to look at a closer picture of it, so at least now I know what I am looking for. Good point about the code and check engine light. I checked to see if there were any codes stored in the computer while I was at the parts store, but there was nothing. At this point, it's starting to look like a fuel issue. A friend suggested I buy some starting fluid and shoot some into the intake before starting. He said that if it starts, but dies right away, that would suggest a weak fuel pump, since I don't have a pressure gauge to test it properly. I'll try that in the morning and see what happens.
Thread Starter
|
New User
Joined: Jan 2007
Posts: 9
Likes: 0
From: Columbus, OH
I tried cycling the key 5 times before attempting to start this morning, but it still didn't want to start. I sprayed some starting fluid in the intake tube and tried again, and even then it didn't fire right away. It took a couple of cranks (which it kinda acted like it wanted to start) before it actually started. The starting fluid did keep me from having to crank on it forever though. Not sure what this means, really. Any other thoughts?
Postmaster
Joined: Oct 2003
Posts: 4,516
Likes: 1
From: SoCal
So theres no codes, cycling the key & starter fluid did'nt help.
If it starts easily when it's warmed up, take a look at the top of the Ranger forum & click on "Ranger technical info" & then on "ECT testing"
The ECT/engine coolant temp sensor is the electronic version of a choke. It tells the PCM whether the engine is cold or warmed up.
The sensor will have 2 wires attached & is near the thermostat housing.
If it starts easily when it's warmed up, take a look at the top of the Ranger forum & click on "Ranger technical info" & then on "ECT testing"
The ECT/engine coolant temp sensor is the electronic version of a choke. It tells the PCM whether the engine is cold or warmed up.
The sensor will have 2 wires attached & is near the thermostat housing.
Trending Topics
Thread Starter
|
New User
Joined: Jan 2007
Posts: 9
Likes: 0
From: Columbus, OH
Yep....already replaced that. Here's the list of stuff I have checked/replaced: MAF sensor(tested ok), ECT sensor(replaced), Intake Manifold gaskets(replaced), IAC Valve(tested ok), replaced the spark plugs, plug wires, and fuel filter. Next on my list of things to do is to check the fuel pressure with a pressure gauge and clean the MAF sensor. I got in it this morning and it fired right up...no starting fluid and no cycling of the key needed. The only thing that was different than my normal routine was the fact that I didn't get home until about 10:30 last night, so it didn't sit for as long. However, this doesn't always make a difference. Here's a question though: If the fuel pump is weak, is it always weak, or could it be intermittently weak? In other words, could there be times when it functions normally, and other times when it doesn't? It seems like my problem is really intermittent, though lately it has been happening more with the cold weather.
Last edited by JBrown24; Feb 8, 2007 at 07:26 AM.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Postmaster
Joined: Oct 2003
Posts: 4,516
Likes: 1
From: SoCal
So theres no codes, a new CTS & it wont fire on the starting fluid. No spark maybe?
Try connecting a timing light to one of the plug wires & see if you are getting a good strong spark.
If the fuel pump was weak, it might be too lean to start, but it should still fire right up on the starting fluid.
Try connecting a timing light to one of the plug wires & see if you are getting a good strong spark.
If the fuel pump was weak, it might be too lean to start, but it should still fire right up on the starting fluid.
Thread
Thread Starter
Forum
Replies
Last Post
PeterSr
1987 - 1996 F150 & Larger F-Series Trucks
9
Jan 12, 2011 08:20 PM
tbar
Explorer, Sport Trac, Mountaineer & Aviator
4
Nov 12, 2004 06:40 AM
76fordman
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
2
Jul 28, 2004 07:16 PM
