Experiencing loss of power, especially going up hills


Asked by Mar 24, 2014 at 02:23 PM about the 2001 GMC Sierra 1500

Question type: Maintenance & Repair

I was driving my 2001 GMC Sierra 1500 the other day and it started having some performance issues. I noticed that the engine would lose a lot of power and almost die but then it would sort of cough and pick up speed again. I haven't had this truck for long but it does have 210,000km on it.

4 Answers


Losing power under load. Your catalytic converter may be plugged. That would explain the power coming back after the rmp's drop and the back pressure releases. Just taking a swing at this one..

3 of 3 people found this helpful.

You may be right. I just did a web search on that and part of what I learned is that the converter will rattle if broken/clogged. I have been hearing this off and on since I bought the truck but I was thinking it was something else.

2 of 2 people found this helpful.

I posted this in another thread, something you could try to troubleshoot: 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.

2 of 2 people found this helpful.

Ok i have a 2004 gmc Sierra 1500 yesterday it just lost all power does not have no Juice won't even turn over checked everything that possible could be what do you think it could be

5 of 5 people found this helpful.

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