ACT Sensor relocation
Thread Starter
|
Junior User
Joined: May 2018
Posts: 80
Likes: 0
ACT Sensor relocation
Alright folks. Long story short put a new motor in my 91 f150 and got back to hooking up all of my wiring harness and it looks like the intake I bought for it off a (supposedly) 94 f150 does not have the inlet for the ACT sensor on the bottom of the intake manifold. I have no idea why I didn’t notice this earlier but I’m 6 months in the rebuild and now dead in the water. I’d really like to think I don’t have to pull everything apart again now that the motor is in the truck and replace the lower intake. I’ve read enough to know the intake is off a Mass air truck and that the Act sensor is located in the air cleaner housing. Is it possible to go junk yard diving and find a housing that will fit my application and keep things moving? Or with the truck being a SD set up I’m playing with fire. Thanks in advance.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
For your EFI system you need the ACT sensor in the lower intake, the one at the airbox will report out of range temps compared to what the PCM expects. You should be able to drill and tap one of the intake runners without removing it from the engine, just make sure the valves are closed on that cylinder and connect a vacuum to the port to remove all debris as you work.
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
I wouldn't risk drilling a hole in my intake without taking it off. If you really don't want to swap the lower intake, your best option IMO is to take the upper intake off, drill and tap a hole in there for the sensor. If you don't want to do that, second best option is to extend the wires and stick the ACT in the air box. The ACT isn't super critical, and would likely work okay there.
Thread Starter
|
Junior User
Joined: May 2018
Posts: 80
Likes: 0
For your EFI system you need the ACT sensor in the lower intake, the one at the airbox will report out of range temps compared to what the PCM expects. You should be able to drill and tap one of the intake runners without removing it from the engine, just make sure the valves are closed on that cylinder and connect a vacuum to the port to remove all debris as you work.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Early trucks didn't have a solenoid the line was just connected to the TB directly. I agree with IAN on drilling the upper intake for the IAT if doing that for the lower makes you nervous, this location should work as well as in the lower.
Thread Starter
|
Junior User
Joined: May 2018
Posts: 80
Likes: 0
Thread
Thread Starter
Forum
Replies
Last Post
Blue86f150
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
6
Jul 15, 2008 09:48 PM
Jrock909
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
1
Mar 5, 2007 02:04 PM
Kwattro
1987 - 1996 F150 & Larger F-Series Trucks
3
Jan 17, 2006 09:55 PM
