temperature guage erratic
Thread Starter
|
Freshman User
Joined: Dec 2003
Posts: 34
Likes: 0
From: longview,texas
temperature guage erratic
82 f100 4.9 inline 6, automatic. Before having engine rebuilt, the temperature guage would rise to where it looked like it my become hot and then the guage would fall back to normal. Then it would happen again. I did have the engine rebuilt and they found that the head at a crack in it. I don't know if this caused the erratic behavior or not. On the left side of my engine in the block toward bottom there looks like to me a sensor of some kind screwed into the block but there was no wire connected. What reads the engine temperature to send to the guage in truck ?
Senior User
Joined: Nov 2005
Posts: 457
Likes: 0
From: Lathrop, MO
That one is for the oil pressure. Block temp is on the righthand side below and slightly behind rear exhaust manfold. The is also a temp sensor in the thermostat housing for the computer to read(if your efi).
Thread Starter
|
Freshman User
Joined: Dec 2003
Posts: 34
Likes: 0
From: longview,texas
I really meant the left side of engine looking from the front. Sorry. I have replaced water pump, hoses, thermostat, just had engine rebuilt, and now when I ran engine to break cam in, the temperature guage doesn't register at all. I tested the thermostat in boiling water. It was ok. I do have a sensor on thermostat housing so I guess I have efi. Should the temp. sensor on the passenger side in the block also be connected with a wire or will the one on the thermostat housing be enough? I'm not even sure if the 82 f100 4.9l has a computer. I do know it has a Duraspark 2 mounted on drivers side fender well.
Thread Starter
|
Freshman User
Joined: Dec 2003
Posts: 34
Likes: 0
From: longview,texas
As Ray Stevens says "its me again Margaret". I finally figured out what efi stands for and I don't have it. I have carb. system. So I guess what I thought was coolant temperature sensor that was screwed into thermostat housing is actually what is called a "ported vacuum switch" . It has 4 vacuum lines going off of it. How dumb do I feel. So this means that the temperature switch is indeed on the passenger side. I found it but there is no wire attached to it. I'll have to locate the wire that is supposed to go there. Then maybe my temperature guage will work. Thanks for the help anyway.
Thread
Thread Starter
Forum
Replies
Last Post
FORDNUT23
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
7
Apr 18, 2011 04:26 AM
Racer944
1997 - 2006 Expedition & Navigator
4
Jul 27, 2004 02:32 PM
