What will make it lose power all of a sudden?


Asked by Mar 23, 2014 at 07:51 PM about the 2005 Dodge Ram 3500 ST Quad Cab LB DRW

Question type: Maintenance & Repair

3 Answers

Mark Grignon

Could be a number of things. Is the check engine light on? How many miles are on the engine? Is it under acceleration that it looses power or during cruising?

2 out of 2 people think this is helpful.

No the check engine light is not on. It is throwing a lot of codes tho. I know that my husband said that he can leave the store in the morning and set the cruise on about 80 and he might make it 8 miles down the road and he is running maybe 55 with the cruise still set

1 out of 1 people think this is helpful.
Mark Grignon

I would suspect a clogged catalytic converter. It's hard to diagnose a problem without data, but from what you're describing it's certainly a possibility. Catalytic converters clog over time from carbon build up. If you can, to test it, you can loosen the exhaust flange where the exhaust connects to the manifold creating a good sized gap. This will reduce the back pressure being created by the clogged cat. It's going to be loud as heck, so I wouldn't recommend driving it around town. But If the truck doesn't loose power with the exhaust separated, then you have your problem solved. Replace the cat.

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