PCM Issues

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Jul 11, 2024 | 10:12 AM

#16

dunecj2a

Mountain Pass

Joined: Dec 2012

Posts: 246

Likes: 19

Quote:

Originally Posted by manicmechanic007

Mt board looked clean with no obvious leaking capacitors, but they were no good

how were you able to tell the capacitors were no good? Is there a way to test them in the board?

Jul 11, 2024 | 10:16 AM

#17

dunecj2a

Mountain Pass

Joined: Dec 2012

Posts: 246

Likes: 19

Quote:

Originally Posted by Scndsin

Yes, many things can fail like any solid-state device.

What was it doing-not doing? You might want to start your own thread to be safe & get maximum exposure of the problem.

Engine has a stumble around 45-50 mph 1800-2000rpm range. But cleans out when accelerating. Has a slight hesitation. The PCM is also 30yrs old and I was thinking that it probably wouldn’t hurt having it tested and capacitors replaced.

Jul 11, 2024 | 10:47 AM

#18

manicmechanic007

Hotshot

Joined: Jul 2020

Posts: 10,529

Likes: 2,658

From: Near Salt Lake City

Quote:

Originally Posted by dunecj2a

how were you able to tell the capacitors were no good? Is there a way to test them in the board?

I simply had replaced everything else chasing the bad miss / stumble my van had
The processor was the last thing to check so I checked it
When I saw no obvious damage, I freaked out some but ordered another processor anyway
Put it in, and have been very happy since
Saved my old one, I am sure it will happen again someday

Jul 11, 2024 | 10:59 AM

#19

Scndsin

FTE Chapter Leader

Joined: May 2006

Posts: 12,341

Likes: 1,314

From: Central Mississippi

Quote:

Originally Posted by dunecj2a

I'm all for making sure, heck I'm a firm believer in spare ECUs & ignition/control parts, etc.

I'd be looking at fuel pressure first.

Again, best start is a new thread.