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4.0 swap issues


ObscureAuto

New Member
Joined
Oct 1, 2024
Messages
2
Reaction score
0
Location
Virginia
Vehicle Year
1989
Make / Model
Bronco 2
Transmission
Manual
Hey all, I'm really stuck. I put a 1994 explorer motor in my bronco 2 and when it works it works great! When it gets warmed up however it starts to misfire REALLY bad to the point where it's undrivable. What's weird is it misses for about 20-30 seconds then it'll clear up, all power is suddenly back and runs smooth for a bit then it repeats the cycle.

I have replaced MAF, coil pack, plugs, wires, ensured all the injectors are good (I never want to take that I take off again...) and a whole heap of other parts. Only cel I have is for EGR. Blocking off EGR on the intake didn't help or hurt. I'm sure there is a lot of other things I've replaced but that's all I can think of for now.

Only thing really that I haven't touched is the fuel pump/pumps (can't remember if this had dual pumps or not).

Any help would be much appreciated because I miss driving this truck dearly..
 


franklin2

Well-Known Member
Joined
Dec 24, 2019
Messages
3,877
Reaction score
1,957
Location
Virginia
Vehicle Year
1984
Make / Model
Bronco II
Transmission
Manual
What happens when you drive it with the O2 sensors unplugged?
 

gaz

Well-Known Member
U.S. Military - Veteran
Joined
Sep 21, 2007
Messages
1,570
Reaction score
753
Location
Wa, Bremerton 98310
Vehicle Year
1987
Make / Model
Ford
Engine Size
87Ranger Endrigo 2.9l, 87BII Endrigo 4.0l
2WD / 4WD
4WD
Total Lift
Ranger 5" (1½" Hiryder/3" body), BII 4" Procomp
Total Drop
Ranger 5sp, BII A4LD
Tire Size
Ranger 32"/4:10LS, BII 33"/3:73LS
My credo
Deengineer until it is how Blue Oval should have sold it!!
@ObscureAuto
The 1994 Explorer 4.0l has a single fuel pump, location, the fuel sender unit mounted inside the of fuel tank.
 

bobbywalter

TRS Technical Staff
TRS Event Staff
V8 Engine Swap
TRS Technical Advisor
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TRS 20th Anniversary
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TRS Event Participant
TRS 25th Anniversary
Joined
Aug 9, 2007
Messages
24,421
Reaction score
5,779
Location
woodhaven mi
Vehicle Year
1988
Make / Model
FORD mostly
Engine Type
V8
Engine Size
BIGGER
Transmission
Automatic
2WD / 4WD
4WD
Total Lift
sawzall?
Tire Size
33-44
My credo
it is easier to fix and understand than "her"
evap and vac issues when egr cycling likely. can you get a 94 non egr pcm? cant remember if they were straight across in 94
 

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