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Old 07-05-2018, 04:05 PM
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Default Bad pcm







I am not sure what this cylinder one is called
Hi all,

Its been a while since i posted but i think i finally found out the random misfire that has been going on with my truck for years. After running all the test (TPS, air temp sensor etc.) i took out the PCM and found these three capacitors that seem to be friend. I was wondering if anyone has ever replaced these before and what exactly they do (i cant seem to find a diagram for them). Also if anyone could tell me what kind of resistor (size) that last picture is along with that black cylinder looking capacitor (i think its a capacitor) that would be great.



This PCM is out of a 1995 F150 5.8L, E40D 2wd
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Old 07-06-2018, 02:39 PM
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That black component looks like a diode.I can't tell exactly all the colors on that resistor from the pic. I wouldn't waste time trying to fix that PCM. Save it for a core and get a REMAN from a good parts source. Myself, I would get one from Rock Auto.

Last edited by raski; 07-06-2018 at 02:44 PM.
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Old 07-07-2018, 02:42 PM
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Originally Posted by raski View Post
That black component looks like a diode.I can't tell exactly all the colors on that resistor from the pic. I wouldn't waste time trying to fix that PCM. Save it for a core and get a REMAN from a good parts source. Myself, I would get one from Rock Auto.
Ya thats probably what im going to end up doing
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Old 07-07-2018, 06:16 PM
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The small vertical ones are electrolytic capacitors. They're available cheap, and are easy to replace, if you have a steady hand & understand soldering. Read this thread:
https://www.fordf150.net/forums/view...p?f=21&t=97221

The last one is a high-current power diode. That might take a little more effort to find, and it'll take a MUCH-bigger soldering iron to R&R.
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Old 07-11-2018, 06:54 PM
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Originally Posted by Steve83 View Post
The small vertical ones are electrolytic capacitors. They're available cheap, and are easy to replace, if you have a steady hand & understand soldering. Read this thread:
https://www.fordf150.net/forums/view...p?f=21&t=97221

The last one is a high-current power diode. That might take a little more effort to find, and it'll take a MUCH-bigger soldering iron to R&R.
Thanks, you dont happen to know what those capacitors control do you? That diode is a bugger to find seems to be old design.
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Old 07-11-2018, 07:43 PM
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They control capacitation. They don't directly control any one thing - they're just parts of their circuitry.
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