Afishhunter
New member
- Joined
- Nov 20, 2016
- Messages
- 6
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- Vehicle Year
- 1986
- Vehicle
- Ford
1986 Bronco II Eddie Bauer.
2.9 liter V6
Automatic Transmission
4 wheel drive
4.10 axle ratio, according to Ford.
NEW: (not used/rebuilt)
Distributor
TFI Module
Heads (Improved version)
In tank fuel pump, strainer, and fuel lines
Frame mounted fuel pump
All fuel filters
Spark Plugs and wires
Front transmission seal and bushing
Vacuume Modulator (Transmission)
Heater core
The fuel tank was removed, and cleaned with muratic acid prior to reassembly.
Tested at various shops:
Timing. The shop suspected the shop that replaced the heads and distributor did not disconnect the SPOUT connector, when they set the initial timing.
Result: "The timing is dead on the money at 10° BTDC with the SPOUT disconnected."
Vacuume
Results: 17 inches at idle. Increased RPM to 3,000 and held there.
Vacuume dropped to zero (normal) but did not build up vacuume after the engine stabilizedcat 3,000 RPM.
DIAGNOSIS: "Restricted Catalytic Converers" (This shop does not do exhaust, suggested a shop that does.)
Exhaust Backpressure at an exhaust shop.
They drilled two holes, tested the back pressure, and welded the holes closed.
Results: "No backpressure at the cats or muffer; you're waisting your time and money if you replace the cats."
Needless to say, these two shops consider the other to be owned and staffed by morons that do not know what they are doing. Both swear by their own analysist.
The problem:
No power under load and horrendous fuel mileage with or without a load.
The mileage varies between 5.5 in town to 10 on the highway, with no load. Obviously, the mileage should be at least double or triple this. My racing days have been over for no less thsn 40 years. I don't try to spin the wheels, etc. and go the speed limit.
I have a trailer I need to pull with this Bronco II. The trailer scales at 2,100 pounds.
The brakes were removed from the trailer, the wheel bearings repacke, and the grease seal was replaced.
The bearings are properly adjusted. (Wheels turn on their own when jacked up)
With the trailer attached, I can ALMOST hit 50 mph on level ground.
With the trailer left at storage, I can hit 65 mph with no problem.
I have a new O2 sensor, which will be installed Monday.
Any ideas as to what is wrong?
I KNOW this thing can pull this trailer. With the 4.1 axles and auto trans, the owners manual says a max combined weight of 8,500 pounds. I scale at a little over 6,000 pounds. Also, this Bronco II has pulled the trailer in the past, with no problems, at 55 to 60 mph, on level ground.
This thing has also gotten near 20 mpg in town and right at 30 mpg on the highway, without the trailer.
Thank you in advance, for your help.
2.9 liter V6
Automatic Transmission
4 wheel drive
4.10 axle ratio, according to Ford.
NEW: (not used/rebuilt)
Distributor
TFI Module
Heads (Improved version)
In tank fuel pump, strainer, and fuel lines
Frame mounted fuel pump
All fuel filters
Spark Plugs and wires
Front transmission seal and bushing
Vacuume Modulator (Transmission)
Heater core
The fuel tank was removed, and cleaned with muratic acid prior to reassembly.
Tested at various shops:
Timing. The shop suspected the shop that replaced the heads and distributor did not disconnect the SPOUT connector, when they set the initial timing.
Result: "The timing is dead on the money at 10° BTDC with the SPOUT disconnected."
Vacuume
Results: 17 inches at idle. Increased RPM to 3,000 and held there.
Vacuume dropped to zero (normal) but did not build up vacuume after the engine stabilizedcat 3,000 RPM.
DIAGNOSIS: "Restricted Catalytic Converers" (This shop does not do exhaust, suggested a shop that does.)
Exhaust Backpressure at an exhaust shop.
They drilled two holes, tested the back pressure, and welded the holes closed.
Results: "No backpressure at the cats or muffer; you're waisting your time and money if you replace the cats."
Needless to say, these two shops consider the other to be owned and staffed by morons that do not know what they are doing. Both swear by their own analysist.
The problem:
No power under load and horrendous fuel mileage with or without a load.
The mileage varies between 5.5 in town to 10 on the highway, with no load. Obviously, the mileage should be at least double or triple this. My racing days have been over for no less thsn 40 years. I don't try to spin the wheels, etc. and go the speed limit.
I have a trailer I need to pull with this Bronco II. The trailer scales at 2,100 pounds.
The brakes were removed from the trailer, the wheel bearings repacke, and the grease seal was replaced.
The bearings are properly adjusted. (Wheels turn on their own when jacked up)
With the trailer attached, I can ALMOST hit 50 mph on level ground.
With the trailer left at storage, I can hit 65 mph with no problem.
I have a new O2 sensor, which will be installed Monday.
Any ideas as to what is wrong?
I KNOW this thing can pull this trailer. With the 4.1 axles and auto trans, the owners manual says a max combined weight of 8,500 pounds. I scale at a little over 6,000 pounds. Also, this Bronco II has pulled the trailer in the past, with no problems, at 55 to 60 mph, on level ground.
This thing has also gotten near 20 mpg in town and right at 30 mpg on the highway, without the trailer.
Thank you in advance, for your help.
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