Question about 1987 Ford Bronco

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302 bronco stalls after it warms up and won't start till it cools down

I have replaced the ignition module spark plugs rotor and button

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  • 84 Answers

I am guessing its your TFI or Thick Film Ignition module. Usually located on the underside of your distributor, its either grey or black in color and often when it is going bad it acts like this: Usually starts fine, runs ok for about 20 min then engine dies. cranking engine sounds normal but no start. checking spark will have no sparks. Leave hood up and allow to cool (also TFI very hot to the touch) I packed Ice around it once (in a ziplock) that made it run in about 45 min. NOTE: get ready to replace real soon because its on the way to breaking down.

Posted on Jun 12, 2014

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Posted on Jan 02, 2017

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SOURCE: 87 ford bronco II idling and power problem

check the i.a.c. (idle air control) valve near the throttle body, it fixed my low idle!

Posted on Nov 24, 2008

midnightcowb
  • 3 Answers

SOURCE: weak spark + 1988 ford bronco

i have an 89 ford bronco if i drive it to work get home shut it off try to start it again it wont start sounds like the battery is dead but have replaced the battery what could it be

Posted on Jan 03, 2009

emissionwiz
  • 76070 Answers

SOURCE: 1995 Ford Bronco 172 EGO not switching lean bank1- jerks when run

Have u checked for vacuum leaks or poss leaking EGR valve? use carb spray around the upper intake manifold where it bolts to the lower manifold, spray vacuum lines where they are connected to the engine vacuum ports, the idle speed will change if u hit a leak, as far as the EGR valve goes see if it gets hot at idle, if it does it is leaking, if all checks ok replace the O2 sensor, but i suspect u will find a leak at the upper intake plenum.

Posted on Jan 10, 2009

warlock61
  • 659 Answers

SOURCE: spark plug wire diagram

1-5-4-2-6-3-7-8 counterclockwise

Posted on Jul 11, 2009

  • 135 Answers

SOURCE: weak spark from dist cap to plugs. spark from coil

The engine is definitely in an over rich fuel condition if you are blowing black smoke. I would suspect a bad 02 sensor, but the flooding condition you describe at starting could be other things. I would check the codes and proceed from there.

Posted on Jul 13, 2009

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My 2004 3800 series pontiac bonneville will start up fine and idle fine but seems like when it gets warm it shuts off?


P0172 is a rich condition > I dough it would cause it to shut off after it warms up . If real rich , it would cause a no start at all . Fouled spark plugs , you can pull the spark plugs to see if they are black or wet with fuel . Starting and running till warm then shutting off is a classic sign of an electronic component starting to fail . Does it start right back up or do you need to wait till it cools down ? If it doesn't start right back up , pull the two plug wires off the same coil and have someone crank it over . Is there spark ? If not , probably ICM - ignition control module is bad . There are videos on youtube on how to test GM DIS ignition systems . (distributor less ignition systems )

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JD JS45 walk behind mover. Starts, runs fine for 5 minutes, then stalls, won't restart till i pull the spark plug and cool the motor, plug down. then same thing starts, runs for 5, stalls.


Probably either a fuel or a spark problem. You need to check for the presence of a good spark immediately the engine stops - by using a spark gap, a spare spark plug or a propriety spark indicator.

If the spark is found to be absent the fault is likely the ignition module but check all connections and the stop switch operation before replacing.

If the spark is present then the fault is probably fuel-related and is the sort of thing a tiny droplet of water in the carb could cause...

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Mike, Check for diagnostic codes. Check fuses/relays,wires/plugs for pinched,damage or corrosion. Could be a lot of things like distributor armature, cap, rotor, stator, ICM, coil,spark plugs,wires, make sure ground is good to distributor. Use the attached forum links,instruction, guides to help diagnose ignition spark problems, Good luck
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Possibly an ignition module or crank sensor problem. These are the two most common stalling electronics that will cause a stall when they get warm/hot and will then continue to operate once cooled down

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When my 92 chev van Lumina gets warm it stalls and won't start till It cools down. What could the problem be.


You'll need to get more information. Find an auto parts store that offers free engine code readouts and have them tell you what the engine computer has detected. This will shorten the long list of possible causes. Post again with the results - you may get to post your own solution.
I've had a bad fuel injector driver transistor in the computer (throttle body injection) and an ignition module do this to me.

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It dies after about thirty minutes, then it won't start until it cools back down


How old are the spark plugs, cap and rotor?? If over 2 years i would replace them. Also you may want to test and replace the ignition module. Sounds like it breaks down due to heat when the engine is warm and needs to cool down before starting again.

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1 Answer

1994 buick lesaber car runs till it gets hot then it stalls and wont start till it cools down any ideas whould be helpful thank you


I don't know this car but if I was you I would start with the ignition system. First getting extra spark plug or tests light. When the car is running good, pull the coil or spark plug wire off and test for spark. By puting the sparkplug or tests light in the sparkplug lead. Then when the problem happens tested again to see if you have sparked. also pouring a little fuel down the intake system. If the car starts you have a fuel problem. If it does not start, you may have a bad ignition module are or coil. Good luck.

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Weak spark + 1988 ford bronco


check the voltage of the b+ terminal of the ignition coil (primary side) with a cheap multimeter while cranking. low voltage to the primary will cause low voltage on the secondary. also recheck all ground paths from the ignition module. ensure good connection from coil to module. note: new parts are not "known good parts" until it runs.--> IG.MOD.

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No spark on 1988 s-10 pickup 2.8 new plugs,wires coil,cap and rotor.ran for about 20mins and then quit,wont start


It could be that the ignition module is defective and causing this problem.If it's the original ignition module it may be time to replace it. The ignition module can be tested by your local Shucks or Auto Zone usually for free, The module when its starting to go out will work fine until it warms up, it will then quit working because the coils inside of it short out, until it cools down. If the module is completely gone there will be no spark at any time, The module is inside the distributor under the rotor held in by a couple of screws,

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