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Old 07-08-2010, 07:12 PM   post #1 of 20
fordmustang1984
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Default 1988 Ford Bronco won't run

I went to sart my 1988 Ford Bronco today, and it started fine, faster than ever before. But after running for 3 minutes to warm up, it started running rough, and finally just died. i could restart it and run it for a few seconds, but every time it does the same thing. i checked the plug wires, distributer, coil, and even remove the aircleaner hoses. It always did the same thing. Any ideas? This was suposed to be the truck i use when i get my license, but now it might not unless i fix whats there now, or do away witht eh fule injection all together (something i really don't want to do unless this motor is blown)
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Old 07-08-2010, 08:19 PM   post #2 of 20
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Icon2 Re: 1988 Ford Bronco won't run

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Originally Posted by fordmustang1984 View Post
I went to sart my 1988 Ford Bronco today, and it started fine, faster than ever before. But after running for 3 minutes to warm up, it started running rough, and finally just died. i could restart it and run it for a few seconds, but every time it does the same thing. i checked the plug wires, distributer, coil, and even remove the aircleaner hoses. It always did the same thing. Any ideas? This was suposed to be the truck i use when i get my license, but now it might not unless i fix whats there now, or do away witht eh fule injection all together (something i really don't want to do unless this motor is blown)
If it starts and runs without a miss the motor is fine.. Check the oil and look for problems- gassy smell? white foamish color means water in there and you do have a problem.. If it's OK then the fuel system sounds like the culprit.. Check your fuel tank level and then your fuel pump pressure.. Report back with results
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Old 07-08-2010, 09:54 PM   post #3 of 20
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Default Re: 1988 Ford Bronco won't run

It runs very rough, and theres no problems with the oil other than being in need of changing. My dad says the fuel filter and a wire on the computer comunication port. next time i am at my grandparents i'll look into both of those.
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'90's John Deere LT-sitting
Simplicity Wonderboy 700-does whatever i need it to...usually
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Old 07-08-2010, 10:02 PM   post #4 of 20
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Default Re: 1988 Ford Bronco won't run

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It runs very rough, and theres no problems with the oil other than being in need of changing. My dad says the fuel filter and a wire on the computer comunication port. next time i am at my grandparents i'll look into both of those.
Check the carb...make sure it's bolted down tight...i have a 86 ..4.9 six cyl. (300 ) that needs the carb tightened about every 6 months..
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Old 07-08-2010, 10:42 PM   post #5 of 20
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Default Re: 1988 Ford Bronco won't run

the truck he's talking about don't HAVE a carb!
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Old 07-08-2010, 11:06 PM   post #6 of 20
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Default Re: 1988 Ford Bronco won't run

I'd say dad is right,first thing I'd suspect is the fuel filter too!--or the gas itself,expecially if it has sat any length of time..water builds up fast in ethanol gas and it'll go stale in a few months time too..take the filter off,and try not to let any gas escape,catch it in a can and see if its rusty or has water in it--then blow thru the filter and see how restricted it was,if you can barely blow thru it you know its full of crud or water..a fuel pressure test wouldn't be a bad idea too..

Some Fords had problems with the ignition module on the distributor crapping out too,so did the older ones that had the "brain box" on the fenderwell..I have however,replaced a few of those ,and pick up coils in the distributor,only to find the problem was not solved,when the vehicle stalled out again days later..it was the wiring harness,where they plug together ,the wires turn green inside and break contact,wont conduct electricity when they heat up after a few minutes from the high resistance--had to chop out a few inches of wire on either side of the plugs and solder them together..I found the bad wires by shaking them when the engine would run..knew it was a spark problem,because there was none after it stalled,then seemed to return after the wires or module cooled off again..
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Old 07-08-2010, 11:22 PM   post #7 of 20
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Default Re: 1988 Ford Bronco won't run

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I'd say dad is right,first thing I'd suspect is the fuel filter too!--or the gas itself,expecially if it has sat any length of time..water builds up fast in ethanol gas and it'll go stale in a few months time too..take the filter off,and try not to let any gas escape,catch it in a can and see if its rusty or has water in it--then blow thru the filter and see how restricted it was,if you can barely blow thru it you know its full of crud or water..a fuel pressure test wouldn't be a bad idea too..

Some Fords had problems with the ignition module on the distributor crapping out too,so did the older ones that had the "brain box" on the fenderwell..I have however,replaced a few of those ,and pick up coils in the distributor,only to find the problem was not solved,when the vehicle stalled out again days later..it was the wiring harness,where they plug together ,the wires turn green inside and break contact,wont conduct electricity when they heat up after a few minutes from the high resistance--had to chop out a few inches of wire on either side of the plugs and solder them together..I found the bad wires by shaking them when the engine would run..knew it was a spark problem,because there was none after it stalled,then seemed to return after the wires or module cooled off again..


i seconded this motion
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Old 07-09-2010, 07:40 AM   post #8 of 20
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Default Re: 1988 Ford Bronco won't run

OK... not much to go on, but dont ditch the Fi... work with it. The Ford system is REAL good, and easy to work with....

OK... so how long has it sat?? Does it start at all now??? Idel?? will it take any throttle?? Do you have fuel psi?? Any past running issues history???
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Old 07-09-2010, 11:21 AM   post #9 of 20
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Default Re: 1988 Ford Bronco won't run

Introduce a spray of carb cleaner or starting fluid into the throttle body. If it starts and then dies, its a fuel delivery problem. Fuel pump or filter.

Good Luck,

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Old 07-09-2010, 07:27 PM   post #10 of 20
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Default Re: 1988 Ford Bronco won't run

It has sat for over a year, but has been run several times, and was just run last month. It does start, but won't idle smooth, and you have to play with it to get throttle. It does have psi, but i have to put the guage on it because i don't know if its losing it. it has had a history of not wanting to run and either not starting, or starting and stopping. The timing is slightly advance so it runs hot and after a while, gets the starter to hot to start it til it cools off. It also has a skip from this, but it never caused any problems before. it also does not lose spark, because i checked that first.
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tractors-
1970 MF-10-IDK
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1972 MF-12G-current mower
1973 MF-12G-Ol' Reliable-down-engine rebuild
1973 MF-12G-down-carburator
'90's Craftsman LT-other mower
'90's John Deere LT-sitting
Simplicity Wonderboy 700-does whatever i need it to...usually
Davis Taskforce 200-Kubota D600 repower
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Old 07-09-2010, 07:43 PM   post #11 of 20
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Icon2 Re: 1988 Ford Bronco won't run

Quote:
Originally Posted by fordmustang1984 View Post
It has sat for over a year, but has been run several times, and was just run last month. It does start, but won't idle smooth, and you have to play with it to get throttle. It does have psi, but i have to put the guage on it because i don't know if its losing it. it has had a history of not wanting to run and either not starting, or starting and stopping. The timing is slightly advance so it runs hot and after a while, gets the starter to hot to start it til it cools off. It also has a skip from this, but it never caused any problems before. it also does not lose spark, because i checked that first.

Ah---> A chance to break out the OLD tools!! Do you have access to a vacuum tester? If so you can use it to determine if the problem is mechanical.. If it stays steady all is good in valve land.. An old trick I used to use is to get an old spark tester and hook it to a good ground and @ the cap I would ground out each cylinder's spark plug wire @ the cap and find out which one didn't change the engine's behavior.. (be careful not to let the spark get YOU & don't do this if there's gas fumage around the area!) That cyclinder/wire/plug is your problem..
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Old 07-10-2010, 07:59 AM   post #12 of 20
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Default Re: 1988 Ford Bronco won't run

Give the idel stabliser a good cleaning.
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Old 07-10-2010, 08:14 AM   post #13 of 20
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Default Re: 1988 Ford Bronco won't run

Is this a full size Bronco or the Bronco II? Old gas is most likely the problem, that gas must smell pretty bad. Dump the gas, get some SeaFoam and fresh gas, I`d change the fuel filter too.
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Old 07-10-2010, 05:11 PM   post #14 of 20
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Default Re: 1988 Ford Bronco won't run

The gas smells fine, and the filter is getting changed. Where is the idle stabilizer?
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tractors-
1970 MF-10-IDK
1971 MF-12H-down-engine issues
1971 MF-12H-repainted-stored
1972 MF-12G-current mower
1973 MF-12G-Ol' Reliable-down-engine rebuild
1973 MF-12G-down-carburator
'90's Craftsman LT-other mower
'90's John Deere LT-sitting
Simplicity Wonderboy 700-does whatever i need it to...usually
Davis Taskforce 200-Kubota D600 repower
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Old 07-11-2010, 06:23 AM   post #15 of 20
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Default Re: 1988 Ford Bronco won't run

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The gas smells fine, and the filter is getting changed. Where is the idle stabilizer?
Its mounted on the intake near the throttle. Two bolts, and the housing has like a short tube like body, with wires going to it. Mine sticks sometimes, and does the same thing.
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