• 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 issue

chrwilkins30

New Member
Joined
Jul 8, 2010
Messages
1,720
Reaction score
6
Points
0
Location
Mishawaka, Indiana
Vehicle Year
1988
Make / Model
Ford
Engine Size
2.9
Transmission
Manual
94 explorer 4.0 into a 88b2. Complete explorer wiring installed onto explorer. Cat is getting cherry red. Gas is getting into the oil. Has magnaflow cat due to space issues. Original can got cheery red aswell. Explorer fuel lines installed all the way to the tank. Fuel pressure at the rail is 35 psi while running. Ran perfectly fine before pulled. What to look for? Need this swap done ASAP!! Been with out a truck for 6months. Any ideas.??
 


adsm08

Senior Master Grease Monkey
Supporting Member
Article Contributor
Ford Technician
TRS 20th Anniversary
Joined
Sep 20, 2009
Messages
34,621
Reaction score
3,580
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
Well, it sounds like you have an over-fueling issue that is lighting your cats up and slagging them.

Leaking injector is probably the culprit.
 

shane96ranger

Well-Known Member
V8 Engine Swap
Joined
Oct 20, 2009
Messages
8,334
Reaction score
214
Points
63
Location
Utah
Vehicle Year
1997 / 1989
Make / Model
Ford F150-Stang
Engine Type
V8
Engine Size
4.6 Triton / 5.0
Original cat, as in the cat on the B2? Or the Explorer?


Posting whilst sitting upon the throne.
 

chrwilkins30

New Member
Joined
Jul 8, 2010
Messages
1,720
Reaction score
6
Points
0
Location
Mishawaka, Indiana
Vehicle Year
1988
Make / Model
Ford
Engine Size
2.9
Transmission
Manual
It had the original explorer cat when I put the engine in. I put a smaller cat in its place because it ran to close for comfort on the skyjacker transmission crossmember.

I didnt see and fuel leaking from any of the injectors.
 

Andy D

Active Member
Joined
Jul 9, 2011
Messages
1,940
Reaction score
9
Points
38
Location
Marshfield MA
Vehicle Year
94
Make / Model
The Rat
Engine Size
4.0 OHV
Transmission
Manual
My credo
to prevent Found On the Road Dead, Fix Or Repair Daily
Maybe apples and Oranges, I had the exact symptoms with a Jeep 360 V8 . Trouble ended up being a weak coil. Engine would run sorta OK , Cat got so hot you could see through it. Melted the ceramic honeycomb of the cat. Split 2 mufflers. Chased the over fuel trouble with a new carb , KA-CHING. My BIL looks at it and says " got another coil? " I grabbed the coil from the parts jeep. and voila. I dont even know what passes for an ignition in the Ranger. But, I bet it isnt too mysterious. A leaky injector could be located if only one plug was dripping wet. If all the plugs are wet, it could be a weak spark.It is not the first thing you check in the situation, but it does happen. Also , seeing as this is an engine swap, it could be a simple low voltage situation. Is the engine block properly grounded?. Is the electrical system charging? Good luck:icon_thumby:
 
Last edited:

shane96ranger

Well-Known Member
V8 Engine Swap
Joined
Oct 20, 2009
Messages
8,334
Reaction score
214
Points
63
Location
Utah
Vehicle Year
1997 / 1989
Make / Model
Ford F150-Stang
Engine Type
V8
Engine Size
4.6 Triton / 5.0
It could be a coil issue. What about the O2 sensor? Is it new?

Posting whilst sitting upon the throne.
 

RonD

Well-Known Member
Joined
Jun 2, 2012
Messages
22,416
Reaction score
5,576
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Check the FPR's(fuel pressure regulators) vacuum line, see if it smells like gas or has gas in it.
If the FPR's diaphragm leaks it sucks raw fuel into the intake, causing the run rich condition.

Motorcraft spark plugs are a must on the 4.0l, it eats other brands.

The MAF sensor plays a big role in the fuel/air mix on the 4.0l and most Fords that use MAF sensors
Good read here about the MAF:
http://www.therangerstation.com/tech_library/CleanMAF.html
 
Last edited:

chrwilkins30

New Member
Joined
Jul 8, 2010
Messages
1,720
Reaction score
6
Points
0
Location
Mishawaka, Indiana
Vehicle Year
1988
Make / Model
Ford
Engine Size
2.9
Transmission
Manual
Pretty sure I figured it out. There was I vacuum leak at the evap purge valvethat went to the charcoal canister. Ive ran it for 20 mins now after I replaced the valve and no red cat. It would usually do it within 5 mins. Also found an upper intalke manifold gasket leaking causing low vacuum and poor idle.
 

RonD

Well-Known Member
Joined
Jun 2, 2012
Messages
22,416
Reaction score
5,576
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Good job :icon_thumby:

What about the fuel in the oil?
Vacuum leak is usually a Lean mix creator.
 

AllanD

TRS Technical Staff
TRS Technical Advisor
Joined
Jun 1, 2001
Messages
7,899
Reaction score
126
Points
63
Age
61
Location
East-Central Pennsylvania
Vehicle Year
1987... sorta
Make / Model
Ford
Engine Size
'93 4.0
Transmission
Manual
1994 4.0 is a SEFI engine meaning thare are six distinct injector pulses.

People go batshit crazy about SEFI but it makes no difference to power and is infact a reliability issue.

and a major bite in the ass for mileage.

The reason for this is the SEFI 4.0's are also EGR 4.0's

Not that EGR itself is a problem, infact it's a damned good idea,
but the implementation used for EGR and the system installed to
verify that EGR is simply not reliable.

THAT leads to another problem, the fact that the engine management
is programmed to go basically "psycho" when it detects an EGR system failure
(or tampering with the system)

What's worse is the DPFE sensor that monitors the EGR system is the only
engine management device that I can think of offhand that is markedly LESS
reliable than the old TFI ignition modules on the 1985-88 2.3 engines.

it is also possible that through your wiring you have multiple injectors crossfiring.

IT would help to know how you wired in the 4.0 engine...
 

UrbanRedneckKid

Active Member
Solid Axle Swap
Joined
Aug 30, 2007
Messages
2,450
Reaction score
17
Points
38
Age
35
Location
Cass Co, Missouri
Vehicle Year
1994
Make / Model
Ford
Engine Size
4.0L
Transmission
Manual
People go batshit crazy about SEFI but it makes no difference to power and is infact a reliability issue.
Allan I'm sure you remember when I switched my from SEFI... I'm way happier with the batch-fire system in the long run. I think it has better throttle response, and seems to fuel better during WOT assaults.
 

chrwilkins30

New Member
Joined
Jul 8, 2010
Messages
1,720
Reaction score
6
Points
0
Location
Mishawaka, Indiana
Vehicle Year
1988
Make / Model
Ford
Engine Size
2.9
Transmission
Manual
Its still glowing now. For the wiring all I did was swap the entire explorer wiring into the bronco. No splicing done in the engine bay.

There might be a possibility with something with the egr. I did take it off to replace the pipe for it.:icon_confused:


Only have 4 more connectors in the inside. 2 from the gauge cluster, the rear wiper switch, and hvac control.

Anyone have any wiring schematics that actually show anything for the gauge cluster that would help.
 

Sponsored Ad


Sponsored Ad

Top