md_lucky_13
Sr. Member
Here is a doozy, hopefully someone will have the flash of light that brings the answer.. I am just about all out of ideas.
The long saga that is "Problems with Mike's Bronco" seems to have taken yet another chapter.
I had the fuel injectors cut out on me, and finnally got everything fixed. I finished hooking everything up, and the sytem ran flawlessly. Everything ran flawlessly.
I went on a big trail ride, which included about 100 miles of road and 50 miles of trails, all in all.
About half way through the day, we came up on a really nasty mud hole. It was the type of clay that looked almost dry, but then you sunk in past your hubs. I let the entire group go first, so they got to really tear up the hole. At the end, you had to make a big 4 foot climb up and out. Well, the first 3 guys winched it, and I went for it. I just about made it up and out, and my engine cut out. It didn't die, it just cut out, dropped RPMS and dropped power. I found reverse really quick, and go enough room to make another run. I made several runs at it, every time just cresting the top only to have my engine cut out. After about 6-8 tries, I got high enough up it that even though my engine cut down to about 1500 rpm (from about 3500) I made it the rest of the way.
I went on to play for the rest of the day, no problems. The motor didn't cut out again, and everything was okay.
End of the day rolls around, and we start to head back. Every time I give it more then about 1/8 of throttle, it sputs, spitters, and the motor cuts out, just like when I was in the pit. Only this time, it is constantly happening. Here are all the details:
Motor runs great when not in gear. It revs fast, doesn't cut out, and can hold any RPM, no problem. There is nothing I can possibly find wrong with the motor.
When driving down the road, if I accelerate slowely to any given RPM, I can drive at that RPM without any problems, without any cutting out.
If I try to accelerate at any more then about 1/8 throttle, the motor bogs, dies, cuts, chokes, and kicks the whole bronco side to side. However, if I shift into neutral, it runs perfect. Even if it is bogging, choking, and dieing: Once I get it out of gear, it revs up quick, perfect, and doesn't miss a beat.
I took it down to the local tranny shop and asked them to take it for a quick spin. I went with the owner, and he said that there was no possible way it could have anything to do with the tranny. He said that if there were any problems with the tranny that would cause that, the tranny would be toast within a mile. Considering I drove it more then 50 miles home this way, I think it has had its chance at the mile.
I am curious as to what it could be. It was running perfect for a long time, and this just suddenly started to happen. Where should I start to really hunt it down. I have made a few quick attempts, but I have not torn into anything very heavy. I just replaced the spark plug wires and moved the air filter up a little higher, due to the air filter assembly rubbing the wires. I thought it was possible to have a short in the wires: no dice.
The motor seems to only be doing this when I have a load on it, ie: in gear. Here are a few ideas I have, but I need a lot more ideas and advice if anyone has ANYTHING to offer.
A: Exhaust. Could I have too much back pressure? Is it possible I hit a muffler and caved it enough to create this? The mufflers look fine, but they are still a little covered in mud.
B: Fuel delivery. Is it possible that some out, only under load, I am missing fuel? I filled the tank to the brim, so I know I am not running out of fuel. I am planning on replacing the fuel filters as safe measure.
C: Spark. Could my coil be going out? Its brand new, as is the distributer, as is the timing chain.
Like I said: this only happens with a load on the motor (like if it is in gear), the motor runs great when there is no load, its full of gas, and all the other basic stuff. Rundown:
351w
C-4 auto
Dana 20
Holley Pro-Jection TBI
-Holley fuel pump (sometimes known to have problems?)
-23 gallon rear tank
Mallor Electronic Ignition
Flame Thrower Coil (Petronix)
and I can give any other details-information if needed. Thanks in advance for any advice!
The long saga that is "Problems with Mike's Bronco" seems to have taken yet another chapter.
I had the fuel injectors cut out on me, and finnally got everything fixed. I finished hooking everything up, and the sytem ran flawlessly. Everything ran flawlessly.
I went on a big trail ride, which included about 100 miles of road and 50 miles of trails, all in all.
About half way through the day, we came up on a really nasty mud hole. It was the type of clay that looked almost dry, but then you sunk in past your hubs. I let the entire group go first, so they got to really tear up the hole. At the end, you had to make a big 4 foot climb up and out. Well, the first 3 guys winched it, and I went for it. I just about made it up and out, and my engine cut out. It didn't die, it just cut out, dropped RPMS and dropped power. I found reverse really quick, and go enough room to make another run. I made several runs at it, every time just cresting the top only to have my engine cut out. After about 6-8 tries, I got high enough up it that even though my engine cut down to about 1500 rpm (from about 3500) I made it the rest of the way.
I went on to play for the rest of the day, no problems. The motor didn't cut out again, and everything was okay.
End of the day rolls around, and we start to head back. Every time I give it more then about 1/8 of throttle, it sputs, spitters, and the motor cuts out, just like when I was in the pit. Only this time, it is constantly happening. Here are all the details:
Motor runs great when not in gear. It revs fast, doesn't cut out, and can hold any RPM, no problem. There is nothing I can possibly find wrong with the motor.
When driving down the road, if I accelerate slowely to any given RPM, I can drive at that RPM without any problems, without any cutting out.
If I try to accelerate at any more then about 1/8 throttle, the motor bogs, dies, cuts, chokes, and kicks the whole bronco side to side. However, if I shift into neutral, it runs perfect. Even if it is bogging, choking, and dieing: Once I get it out of gear, it revs up quick, perfect, and doesn't miss a beat.
I took it down to the local tranny shop and asked them to take it for a quick spin. I went with the owner, and he said that there was no possible way it could have anything to do with the tranny. He said that if there were any problems with the tranny that would cause that, the tranny would be toast within a mile. Considering I drove it more then 50 miles home this way, I think it has had its chance at the mile.
I am curious as to what it could be. It was running perfect for a long time, and this just suddenly started to happen. Where should I start to really hunt it down. I have made a few quick attempts, but I have not torn into anything very heavy. I just replaced the spark plug wires and moved the air filter up a little higher, due to the air filter assembly rubbing the wires. I thought it was possible to have a short in the wires: no dice.
The motor seems to only be doing this when I have a load on it, ie: in gear. Here are a few ideas I have, but I need a lot more ideas and advice if anyone has ANYTHING to offer.
A: Exhaust. Could I have too much back pressure? Is it possible I hit a muffler and caved it enough to create this? The mufflers look fine, but they are still a little covered in mud.
B: Fuel delivery. Is it possible that some out, only under load, I am missing fuel? I filled the tank to the brim, so I know I am not running out of fuel. I am planning on replacing the fuel filters as safe measure.
C: Spark. Could my coil be going out? Its brand new, as is the distributer, as is the timing chain.
Like I said: this only happens with a load on the motor (like if it is in gear), the motor runs great when there is no load, its full of gas, and all the other basic stuff. Rundown:
351w
C-4 auto
Dana 20
Holley Pro-Jection TBI
-Holley fuel pump (sometimes known to have problems?)
-23 gallon rear tank
Mallor Electronic Ignition
Flame Thrower Coil (Petronix)
and I can give any other details-information if needed. Thanks in advance for any advice!
