Question about 1989 Ford Bronco II

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Runs good cold then loses power when it warms up

1989 Ford Bronco II 2.9l runs good cold then loses power when it warms up.

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  • Anonymous Mar 12, 2014

    when suburban gets warm it loses power when i give it aceleration runs find when cold



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Try a solid tune up first, Filters, plugs, cap, rotor, wires. If that has not been addressed? It can make problems.

Runs good when cold, warm runs bad could also point to an issue with the EEC-4 system. When stone cold? The system is in "Open Loop" meaning it's working off presets. When at temp? The system enters "Closed Loop" and using the computer/sensors to control the engine. If a tune up fails to help? Might want to have someone check the computer for trouble codes. It might have a few more clues. (Key Note: Not every issue with the engine computer/control system will kick on the check engine light---but the system will store the codes for retrieval later)

Posted on Jul 11, 2010

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Have your spark plugs changed. use the correct specification.

Posted on Apr 28, 2010


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89 bronco II fuel injectors not squirting fuel. have good pressure to rail

You need to run a fault code test, also make sure your check engine light works, if not check to see if the fuse and relay for the ECU is ok and the computer is getting power. To do a fault code test follow the link.

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Sep 12, 2012 | 1988 Ford Bronco II

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88 bronco. runs fine untill it warms up then loses most power

Sound like an ignition issue.The hotter temps are causing a part to fail.If you've never replaced the ignition coil,this is the easiest place to start.Another possibilty would be the pickup in the distributor,or the reluctor on the distributor shaft.

May 30, 2012 | 1988 Ford Bronco II

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Im not getting heat in my 1989 ford bronco II. i replaced the thermostat< and still only getting luke warm. im not getting drips in the passenger floorboards, and my windsheild isnt fogging, so i...

You could have an air bubble in the system. It is also possible that the heater core has debris blocking the flow of water. I would check to see that you are getting good circulation by checking the heater hoses near the firewall. If they are both getting hot then you may have an air baffle issue inside the heater box.

Dec 03, 2010 | 1989 Ford Bronco II

1 Answer

Why does my 1989 bronco II lose power after it gets warmed up? After taking off from a stop, I have to floor it to get it moving, & it is slow getting up to speed.

does it feel like it is running rough? a mis fire could cause this and if it does it when it warms up you could have a fuel riching mixture problem.

how does it feel>?

Oct 25, 2009 | 1989 Ford Bronco II

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Cold starts ok warms up shakes and stalls

check engine coolant temperature when it gets warmer, or at operating temperature, and verify that the temperature gauge is showing warmed up to operating temperature. If the coolant temperature sensor tells the computer the engine is cold it will over fuel and miss and the engine will die. When cooled down it will run fine until it warms up. Also could be coil if it starts missing after warmed up.

Aug 18, 2009 | 1990 Ford Bronco II

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2.9 ford bronco 2 runs about 10 min. then just shuts off like you turned off the key ??

replace you duraspark box, when it warms up it shorts out causing the engine to lose fire and quit.

Jul 18, 2009 | 1987 Ford Bronco II

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$3.00 pc of **** thermal switch on thermostat housing. get a metal (brass) one if you can. been there...done that...

Feb 22, 2009 | 1986 Ford Bronco II

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