Mechanics

ENGINE MISSES, STUTTERS, WONT START UNTIL

1993 Ford Bronco

Engine Performance problem
1993 Ford Bronco V8 Four Wheel Drive Automatic 100000 miles

1993 bronco gets hot and then loses power, misses, and bucks. Wont start until cools down. Temp gauge shows to be in mid normal range, but is hot. Can smell exhaust and gas odor. Fuel emer shut-off not activated. After it cools, engine starts right up. Pump was recently replaced; had valve job; head job; etc. Something seems to be interfering with fuel. When hot and u start it, engine seems to miss and either dies or after pumping gas, it stutters and then starts to run.
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Tmbkb
September 13, 2009.




Check ECT and ignition module. Module can be tested at the parts store.

Merlin2021
Sep 13, 2009.
Will check the ECT, but that shouldn't cause the engine to cut-out or miss, or? Why would an engine module cause this kind of problem?
Thanks

Tiny
Tmbkb
Sep 13, 2009.
If ECT is bad it will be difficult or not start because it acts like a choke on fuel injected vehicles. Ignition module supplies spark along with the coil, if mod is going, one of the signs is hard/no start after missing and cutting out...coil too! If check engine light is on, lets read the codes, write them down and post results. Do this and count the flashes...Count the flashes, a 22 will flash as 2 flashes then a short pause, then 2 flashes, if more than one code is stored, the pause will be longer. The codes will display three times and end with 11 or 111. Write them down and post here. First do this with the ke on engine off, then again with it running.


http://www.2carpros.com/forum/automotive_pictures/62217_Ford_Self_Test_95_3.jpg


Merlin2021
Sep 14, 2009.
1. No check engine light ever comes on.

2. Temp gage seems to operate properly - when in traffic it goes up and when on road it goes down.

3. This problem doesnt occur all the time, only when motor gets really hot. Then when it cools down, starts just fine.

Will check codes, but will take time. Any other ideas I can check at the same time, ie - sensors.
Thanks
kelly

Tiny
Tmbkb
Sep 14, 2009.
Temp gauge uses a temp sening unit, not the same as the ECT! (engine coolant temp) sensor. Check engine light should come on as soon as you turn the key to the on position, before you turn it to start, then go out after the engine starts? the one you want to check is on the thermostst housing, the one for the gauge is on left front corner of the engine. If you have an Ohm meter test it with these values.


http://www.2carpros.com/forum/automotive_pictures/62217_ect_Range_1.jpg

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Merlin2021
Sep 14, 2009.
OK, Cool. Will have to do my code reading tomorrow AM (Tues), no choice. Will check everything I can and then post the codes.
Thanks for your help.

Ps - truck acted up again today. Just drove 2 miles to the store and then when I came out, it started and then sputtered for 10-20 seconds, exploded some gas and then stopped. All it would do then is spin motor, not even try to fire, like it wasnt getting gas or no spark.

1 hour later, all was well and it started just fine.

Kelly

Tiny
Tmbkb
Sep 14, 2009.
Check for codes then this: Start with the basics, and work your way up, Last tune up was? Wires plugs ALL filters? If all that is ok, check for a stuck EGR, then test fuel pump pressure, If it won't restart, determine what's missing, the engine needs three things to run, Spark at all plugs, gas to all cylinders, and compression in all cylinders, tho an engine may run lacking one in one cylinder, it won't run very well!
http://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
Go here and checkout our video.
http://www.2carpros.com/car_repair_video/test_engine_ignition_system.htm
and this one!

Merlin2021
Sep 14, 2009.
As before, the engine runs perfectly, perfectly until it gets hot in traffic; runs good until you shut it off; then it wont start; acts like its getting fuel for the 1st few spins, then there is no firing at all.

SO, its getting spark, pressure, fuel, and all the good stuff, until it gets very hot. Coolant overflow tank never overflows and check engine light does not come on. All the basics are there, until it gets very hot and the temp gauge is still in normal mode.

Tiny
Tmbkb
Sep 15, 2009.
OK, did code tests. Did KOEO and got codes 11 and 1111, then from CM got codes 179 and 332 and that was all.

When I did KOER, I got the 4 flashes and performed the ritual exactly and did not get the single flash to indicate for me to press the throttle. Did this twice and could not get the single flash for me to continue the test.

?

Tiny
Tmbkb
Sep 15, 2009.


http://www.2carpros.com/forum/automotive_pictures/62217_179_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_332_1.jpg


Upper intake is full of carbon. Remove EGR and clean the ports, May need to remove upper intake, clean out the carbon under it. The idle air control on the side of your throttle body is full of carbon as well, Ford recommends not cleaning these, just replace it, does not always set a code! ECT NEEDS to be tested have you done this yet!?

Merlin2021
Sep 16, 2009.

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