• 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.

Bronco II 4.0 swap wiring Need help asap


SlipknotBren

New Member
Joined
Mar 1, 2016
Messages
11
Reaction score
0
Points
0
Vehicle Year
1987
Make / Model
Ford
Transmission
Manual
I have a 87 bronco ii with a recently swapped 4.0 out of a 93 explorer the swap went well other than I'm not gettin spark... Does the fuel pump have to be working for it to spark? How does it even get the signal being distributor less what wire controls this and how do I fix it? My crankshaft position sensor is getting no voltage but the icm. And does anyone have a list of what wires go where on the 87 to 93 swap? Thanks. Bronco is my daily and its down so I need it asap
 


SlipknotBren

New Member
Joined
Mar 1, 2016
Messages
11
Reaction score
0
Points
0
Vehicle Year
1987
Make / Model
Ford
Transmission
Manual
I have power to the computer, coil, and icm but not to crank sensor or interim switch does the interia switch prevent fire? I know it's messes with fuel
 
trail B2

trail B2

New Member
Joined
Jan 17, 2009
Messages
1,289
Reaction score
8
Points
0
Location
North Eastern Ca.
Vehicle Year
1986
Make / Model
ford
Engine Size
4.0
Transmission
Manual
Spark works from the crank sensor.Did the motor run when you changed it? it might be sensor. Check for smashed wires, check plugs connections for being clean check that wire is hot when key is on.
 
adsm08

adsm08

Senior Master Grease Monkey
Supporting Member
Article Contributor
Ford Technician
TRS 20th Anniversary
Joined
Sep 20, 2009
Messages
34,623
Reaction score
3,613
Points
113
Location
Dillsburg PA
Vehicle Year
1987
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0
Transmission
Manual
2WD / 4WD
4WD
Tire Size
31X10.50X15
1) But the ICM what?

2) What is an "interim switch"?

The engine will not run without the crank sensor. You will not have spark, or injector pulse without that signal because the computer won't know the engine is spinning.

The inertia switch is a totally unrelated system. Its only function is to shut down the fuel pump in an accident.

The fuel pump doesn't have to be working to enable spark, but if the fuel pump isn't priming it can be a sign that other things are also not getting power.


Now, the specific of the CKP wiring on the 4.0 escapes me ATM and I don't have my book handy, but not all crank sensors get power. Some of them produce an AC signal and don't need power fed from an external source.
 

SlipknotBren

New Member
Joined
Mar 1, 2016
Messages
11
Reaction score
0
Points
0
Vehicle Year
1987
Make / Model
Ford
Transmission
Manual
It was the ICM it was working on the explorer... Swapped it over and it didn't. Bought a new one and she fires right up thanks for the input!
 
You must log in or register to reply here.

Sponsored Ad


Sponsored Ad

Staff online

Members online

Total: 808 (members: 9, guests: 799)

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.

Latest posts

Truck of The Month


Shran
April Truck of The Month

Recently Featured

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

Follow TRS On Instagram

Latest Album Photos

Hunters
20240409_190831.jpg
20240409_190818.jpg
20240409_180824.jpg
20240409_182648.jpg
20240409_181010.jpg
20240408_175026.jpg
99 Ranger
20200706_161414.jpg
20240207_155117.jpg
20240207_155111.jpg
20240207_154537 - Copy.jpg

TRS Events

25th Anniversary Sponsors

Check Out The TRS Store


Sponsored Ad


Sponsored Ad

Sponsored Ad


Amazon Deals

Top