• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

New here and need help


Shaggy

New Member
Joined
Jan 27, 2021
Messages
7
Reaction score
0
Points
1
Location
80812
Vehicle Year
1993
Make / Model
Ford ranger
Transmission
Manual
Hello I'm new here I have a 93 ford ranger with a 3.0 engine that I rebuilt about 7k miles ago. I have a couple problems with it I can't figure out I have an undercooling problem have replaced the thermostat 3 times, maf sensor, temperature sensors, and my heater core. I also have a reving problem when I let go of my gas my truck wants to keep speeding up unless I press my clutch in to let the engine rev to 3k then it droppes back down I have replaced my iac motor and nothing changed. Both problems have been going on since I bought the truck way before I rebuilt the motor. If anyone can help me figure out what else could causing these problems I would be grateful. Thanks
 


Rock Auto 5% Discount Code: 7FA902352B4C01: April 5th, 2021

Dirtman

Former Middleweight Moss Fighting Champion
Supporting Member
Joined
May 28, 2018
Messages
16,106
Reaction score
9,759
Points
113
Location
41N 75W
Vehicle Year
2009
Engine Type
2.3 (4 Cylinder)
Transmission
Automatic
2WD / 4WD
2WD
Total Lift
It's up there.
Total Drop
It's down there.
Tire Size
Round.
Welcome to the forum!

source.gif


I'm sure one of the resident geniuses will be along soon to give you much better help than me but in the meantime a couple questions.

First and foremost have you checked the computer for any codes? Your truck is OBD1 and just because the check engine light isn't on doesn't mean there's no codes in there. Codes are valuable info...

When you say "undercooling" I assume you mean overheating, are you using the OEM temp thermostat? Have you verified the temperature outside of relying on the instrument cluster guage? Im assuming the water pump was replaced when you rebuilt the engine? At 7k miles the engine should have "burped" but it's worth asking if you are sure all the air was removed from the system?

As for the reving issue. Check your TPS sensor. If you have a multimeter you can do a sweep test. Pretty good video on how to do this below.

 

Shaggy

New Member
Joined
Jan 27, 2021
Messages
7
Reaction score
0
Points
1
Location
80812
Vehicle Year
1993
Make / Model
Ford ranger
Transmission
Manual
Thanks for the reply but no it really is an under cooling problem. I'll take a picture and add it my heater is actually pretty cold it heats up just a little enough to keep me from freezing lol. My thermostat is OEM and I did check for codes and I don't have any codes.
I'll test my TPS sensor and let you know
20210128_063507.jpg
 

rumblecloud

Active Member
Supporting Member
Joined
Mar 6, 2020
Messages
375
Reaction score
148
Points
43
Location
Michigan
Vehicle Year
1994
Make / Model
Ranger Splash
Engine Type
4.0 V6
Transmission
Automatic
2WD / 4WD
4WD
Total Lift
Stock
Total Drop
Stock
My credo
What's the worst that could happen?
When you say it's under cooling, to me, that means it is not getting cool enough. Nevertheless, screw the terminology.
Since you replaced the heater core, can we assume you're not getting any heat? Have you felt the radiator hoses? Is the gauge frockled?

Keep posting, someone will be able to help.:p
 

Uncle Gump

Forum Staff Member
Forum Moderator
Supporting Member
Joined
Sep 17, 2018
Messages
6,286
Reaction score
3,814
Points
113
Location
Plano IL
Vehicle Year
2006
Make / Model
Ford
Engine Size
4.0L
Transmission
Automatic
2WD / 4WD
4WD
My credo
Lead, Follow or get out of my way
I've been messing with vehicles for many years... can't say I ever heard the term until now.

From what I see on your temp gauge (cold) and description of minimal heat from the heater... it would be better to say the engine won't reach operating temperature. That could also be considered over-cooling I guess but certainly not under-cooling.

How about you forget that term and tell us what is actually happening with the engine temperature. Does it run cold... doesn't heat up?
 

Shaggy

New Member
Joined
Jan 27, 2021
Messages
7
Reaction score
0
Points
1
Location
80812
Vehicle Year
1993
Make / Model
Ford ranger
Transmission
Manual
Right it's not heating up all the way. I felt my hoses and there warm but not like any of my other cars and I'm sorry if I was using the wrong term I'm still learning
 

Shadowrider6661

D RANGED
Supporting Member
U.S. Military - Veteran
ASE Certified Tech
Joined
Aug 23, 2017
Messages
312
Reaction score
119
Points
43
Age
60
Location
Off grid Northern Arizona.
Vehicle Year
1997
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
Stock
Transmission
Manual
2WD / 4WD
4WD
Total Lift
4"
Total Drop
N/A
Tire Size
33 x 12.50 x 15
My credo
Drive it, Break it, Fix it, REPEAT !
It could be the size of your radiator. I have the same problem with my 97, it doesn't get to operating temperature. It runs cold because I have the biggest radiator made for it, the only time the temp goes above 100° is when I'm pulling a trailer, even then it only gets to 130° but drops back down constantly. I don't know if this helps, just food for thought !
 

rumblecloud

Active Member
Supporting Member
Joined
Mar 6, 2020
Messages
375
Reaction score
148
Points
43
Location
Michigan
Vehicle Year
1994
Make / Model
Ranger Splash
Engine Type
4.0 V6
Transmission
Automatic
2WD / 4WD
4WD
Total Lift
Stock
Total Drop
Stock
My credo
What's the worst that could happen?
Right it's not heating up all the way. I felt my hoses and there warm but not like any of my other cars and I'm sorry if I was using the wrong term I'm still learning
Ha! We're all still learning! Don't worry about the terminology...let's talk about fixing your truck.
 

Uncle Gump

Forum Staff Member
Forum Moderator
Supporting Member
Joined
Sep 17, 2018
Messages
6,286
Reaction score
3,814
Points
113
Location
Plano IL
Vehicle Year
2006
Make / Model
Ford
Engine Size
4.0L
Transmission
Automatic
2WD / 4WD
4WD
My credo
Lead, Follow or get out of my way
I've owned a few 4.0L engines... I've never had any heat issues. They will typically cook you right out of the cab. I say this because it's not like the in-line 4cyl engines that just don't heat up well.

So you've replaced the thermostat three times? Are you buying the cheapest stats you can find? Have you tested any of them?

My mind says it's the thermostat. To me I think it opens to soon and once it does... it doesn't offer enough of a restriction to let the coolant heat up. Put a pot on the stove with water and your old stat with a thermometer. Do a little testing.

There are a ton of junk parts these days... see if you can find a Motorcraft Thermostat.
 

Dirtman

Former Middleweight Moss Fighting Champion
Supporting Member
Joined
May 28, 2018
Messages
16,106
Reaction score
9,759
Points
113
Location
41N 75W
Vehicle Year
2009
Engine Type
2.3 (4 Cylinder)
Transmission
Automatic
2WD / 4WD
2WD
Total Lift
It's up there.
Total Drop
It's down there.
Tire Size
Round.
Are you sure the guage is working? If the needle never moves at all I'd be inclined to say the guage is not functioning.

You say you replaced the sensor. There are two temperature sensors, one two wire used by the computer and 1 singe wire used just for the guage. You can also obviously have a problem with the wiring/connector being broken.
 

Shaggy

New Member
Joined
Jan 27, 2021
Messages
7
Reaction score
0
Points
1
Location
80812
Vehicle Year
1993
Make / Model
Ford ranger
Transmission
Manual
I tested my tps sensor and it's good. I'll have to test the thermostat. I did put a peice of cardboard in front on my radiator and it did heat up more I was getting better heat out of my heater and my temperature gauge went up as well just above the cold line
 

Dirtman

Former Middleweight Moss Fighting Champion
Supporting Member
Joined
May 28, 2018
Messages
16,106
Reaction score
9,759
Points
113
Location
41N 75W
Vehicle Year
2009
Engine Type
2.3 (4 Cylinder)
Transmission
Automatic
2WD / 4WD
2WD
Total Lift
It's up there.
Total Drop
It's down there.
Tire Size
Round.
Another issue with the reving could be a dirty throttle body not closing properly, try cleaning it with throttle body cleaner (NOT CARB CLEANER!). If you use carb cleaner it can remove the coating and cause the throttle body to stick. Most ford throttle bodies have a teflon coating on them. Some even have a warning sticker on them about this.

Or someone messed with the anti-deisel screw that people mistake for an idle screw. If you mess with that screw it messes up the TPS sensor.
 

Shaggy

New Member
Joined
Jan 27, 2021
Messages
7
Reaction score
0
Points
1
Location
80812
Vehicle Year
1993
Make / Model
Ford ranger
Transmission
Manual
Ok i will look at those
 

19Walt93

Well-Known Member
Ford Technician
V8 Engine Swap
Joined
Nov 13, 2018
Messages
2,321
Reaction score
1,444
Points
113
Location
Canaan,NH
Vehicle Year
1993
Make / Model
Ford Ranger
Engine Type
V8
Engine Size
351
Transmission
Automatic
2WD / 4WD
2WD
Total Drop
3"
Tire Size
235/55R16
My credo
If you don't have time to do it right will you have time to do it over?
What brand of thermostat are you using and does it seal well in the housing? If coolant can pass around the thermostat it isn't going to work. I'd fix the temp problem before getting involved with the running issue. When you get that far, check the voltage at the signal return wire coming out of the TP, you want as close to 1 volt as you can get by moving the TP back and forth on the screws.
 

Alan_nc

Active Member
U.S. Military - Veteran
Joined
May 5, 2020
Messages
204
Reaction score
129
Points
43
Location
US
Vehicle Year
1994
Make / Model
Ranger Splash
Engine Type
3.0 V6
Transmission
Automatic
2WD / 4WD
2WD
How long have you run the engine. My 94, 3.0 takes forever to heat up and even after 10 miles of driving the needle will only be maybe up to 1/4. I do have good heat after maybe 5 miles.
The thermostate shouldn't make any difference (unless it's stuck shut) as at some point they all are open and the coolant is running freely.
 


Top