PCM inspection
Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
Sure was a lot posted since yesterday morning. What everyone said, is correct. The caps have a lifespan similar to vaccum tubes. If it's been this long, then chances are they have fulfilled they intent. They are under harsh conditions and I trully wish I had the caps that were manufactured then than today's cap's. I see hundred of bad caps and it's due to a "CHEAP" formula. The "HIGH QUALITY" formula was stolen and then imitations were used in the process and sold at bottom price so mass production on a large scale wouldn't hurt the profits.
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Senior User
Joined: Nov 2010
Posts: 105
Likes: 0
From: North Central Ohio
Thanks Guys!
What I figures is this, If I go to a bone yard and just buy anonther one, chances are it's gonna do the same thing. like Drjoe said, it's 99 cent fix and if it doesn't work not big loss. I also figured that since the truck runs ok (except for when the computer sits in cold temps) I figured it's still working and not fried. I should hurry and fix it before it does. I won't run it any more until I fix it!
What I figures is this, If I go to a bone yard and just buy anonther one, chances are it's gonna do the same thing. like Drjoe said, it's 99 cent fix and if it doesn't work not big loss. I also figured that since the truck runs ok (except for when the computer sits in cold temps) I figured it's still working and not fried. I should hurry and fix it before it does. I won't run it any more until I fix it!
Fleet Mechanic
Joined: Nov 2011
Posts: 1,823
Likes: 43
From: New York
Bumping this thread as it's a good discussion on the PCM capacitor issue and also includes an attachment with a thorough write-up on replacing capacitors (admittedly on a DSM PCM, but the process is the same). Note that polarity matters when swapping in new capacitors.
Fleet Mechanic
Joined: Nov 2011
Posts: 1,823
Likes: 43
From: New York
It's not clear form this thread - did you replace the capacitors? Judging by what I've found, the PCM will still work despite failed/failing capacitors. It seems like it just may function sub-optimally, and eventually fail entirely if the original capacitors are left in place.
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