• 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.

4.0 swap


Leland

New Member
Joined
Jun 9, 2017
Messages
1
Reaction score
0
Points
0
Vehicle Year
1989
Make / Model
Ford
Transmission
Automatic
I just completed a 4.0 swap on my 89 Bronco 2, the donor was a 94 Explorer. The issue I am having is after I drive for a while and shut it off it won't start right away, I have to let it sit for a while 15-20 minutes. It doesn't overheat, miss or anything else it runs great. Anyone have a clue?
 


RonD

Official TRS AI
TRS Technical Advisor
Joined
Jun 2, 2012
Messages
25,291
Reaction score
8,296
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Welcome to TRS :)

Nothing comes to mind right off

But you could find out if it was spark or fuel causing the no start using 50/50 test
After engine is warmed up and doesn't start
Pop the hood
pull off the power brake booster's vacuum hose, from the booster end, hold it up
Spray Quick Start(ether) or gasoline into the hose so it goes into the intake
Put hose back on and try to start engine
If it starts and dies fuel system is the problem
If it doesn't fire then spark is the problem
50/50


1994 4.0l used EDIS-6 module for spark it was usually located on the front side of the Rad support to keep it cool, i.e. out of engine bay and in cooler air.
Where is yours located?

You don't mention poor MPG which would be a sign of leaking injector or FPR(fuel pressure regulator)
This can cause Flooded Engine issue on warm start.

CKP(crank position) sensor is the main sensor for the system, only sensor that can cause a no start, but these rarely fail, not never, just rarely
CKP sensor generates its own AC voltage as crank spins next to it, it isn't a high voltage, so can be effected by heated wires.
CKP is located at about 10:00 on the front of the engine next to crank pulley, its wires run up the front of the engine around water pump and into the main harness on lower intake.
Have a look at that section of wire, make sure it hasn't been damaged and insulation is still intact

There was a member here that had similar issue with 2.9l using TFI ignition, so not related at all to your type of system, but...........
He had an interesting approach to find the problem............ICE
Used a bag of ice to cool down TFI module or coil or ?? to see if engine would restart faster in one of the components was cooled down
 
Last edited:

Rustbucket350

Active Member
Joined
Jun 17, 2016
Messages
140
Reaction score
32
Points
28
Vehicle Year
1986
Make / Model
Ford
Transmission
Manual
Might want to carry a test kit with you and check the fuel pressure when it won't start.
 

BLOODBANE

Active Member
V8 Engine Swap
TRS Banner 2010-2011
Joined
Aug 7, 2007
Messages
1,119
Reaction score
19
Points
38
Location
Canon City, CO
Vehicle Year
19841994
Make / Model
FORDFORD
Engine Size
347, 4.oh
Transmission
Automatic
Might want to carry a test kit with you and check the fuel pressure when it won't start.
My 94 Explorer was having issues like this as well. It would run fine and out of the blue it would just crank (no start). I ended up taking it to FORD and they had it about 2 weeks and came up with bad fuel pump (starting to go). This is just my experience and not necessarily what your facing.
 

richard booth

Member
Joined
Mar 18, 2012
Messages
203
Reaction score
28
Points
18
Location
Tacoma wa
Vehicle Year
1988
Make / Model
ford
Engine Size
2.9 for now.
Transmission
Manual
Had a similar issue that turned out being the inertia switch.
 
Joined
Sep 24, 2012
Messages
432
Reaction score
1
Points
16
Vehicle Year
07/86
Make / Model
ford
Engine Size
4.0
Transmission
Manual
just did a 4.0 swap a year ago and was very pleased. still running strong.

as posted already i would check fuel pressure. then check spark. if it is an orange color it is weak. needs to be bright blue.

if may be ground related. easy to miss in doing a swap.

check for codes as well
 

dangerbird92

New Member
Joined
Oct 10, 2009
Messages
6
Reaction score
0
Points
0
Location
fremont, indiana
Vehicle Year
1984
Make / Model
Ford
Engine Size
2.8 v6
Transmission
Manual
I just completed a 4.0 swap on my 89 Bronco 2, the donor was a 94 Explorer. The issue I am having is after I drive for a while and shut it off it won't start right away, I have to let it sit for a while 15-20 minutes. It doesn't overheat, miss or anything else it runs great. Anyone have a clue?
Any chance you can give me some advice on how you did the wiring the write up doesn't give a lot of details 89 bronco ii and I have a 4.0 and wiring from a 94 explorer

Sent from my SAMSUNG-SM-G891A using Tapatalk
 

BlackBII

Ranger Custom
Article Contributor
OTOTM Winner
TRS Banner 2010-2011
Truck of Month
Joined
Aug 14, 2007
Messages
7,895
Reaction score
982
Points
113
Location
UT
Vehicle Year
1989
Make / Model
Ford
Engine Type
4.0 V6
Transmission
Manual
2WD / 4WD
4WD
Total Lift
5
Tire Size
33
Any chance you can give me some advice on how you did the wiring the write up doesn't give a lot of details 89 bronco ii and I have a 4.0 and wiring from a 94 explorer

Sent from my SAMSUNG-SM-G891A using Tapatalk
What specifically do you have questions on? You basically need to swap the entire engine bay harness along with the computer. If you also swap the dashboard it makes it much easier.

You'll likely have to put some extra time into the harnesses that go to the rear of the truck; tail lights, fuel pump, etc.
 

dangerbird92

New Member
Joined
Oct 10, 2009
Messages
6
Reaction score
0
Points
0
Location
fremont, indiana
Vehicle Year
1984
Make / Model
Ford
Engine Size
2.8 v6
Transmission
Manual
What specifically do you have questions on? You basically need to swap the entire engine bay harness along with the computer. If you also swap the dashboard it makes it much easier.

You'll likely have to put some extra time into the harnesses that go to the rear of the truck; tail lights, fuel pump, etc.
On the write up it says I have to cut and splice wires in the driver's side fender I pretty much got that other than a red wire and a red with blue stripe than it says I have to cut the power distribution box and replace it with the explorer but it is unclear why

Sent from my SAMSUNG-SM-G891A using Tapatalk
 

Sponsored Ad


Sponsored Ad

Staff online

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Truck of The Month


Kirby N.
March Truck of The Month

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Follow TRS On Instagram

TRS Events

25th Anniversary Sponsors

Check Out The TRS Store


Sponsored Ad


Sponsored Ad

Sponsored Ad


Amazon Deals

Top