quikrete123
Junior Member
Hello, first post here cause i'm at a loss. I have a 1998 ram 1500 5.9l 2wd that is sputtering, losing power and what sounds like backfiring when it idles. It only does this when idling and it is intermittent, some times it runs great for a while then acts up. if i stomp on the gas when it is doing this it will come back and run normal but sometimes it lasts longer then others. The truck had an upstream 02 code so i replaced both o2 sensors and no codes now but this is when the problem started. I checked vacum lines and replaced any with cracks or that were broken, took throttle body off and cleaned it, problem sill perssists.
Everything I've seen online points to bad upstream o2 sensor. Just had it at emission check center and it passed but said gas cap was bad, they gave me a free one to replace it.
Is it possible a faulty gas cap can cause this? I don't think it can but you never know. If it is the o2 sensor and its a new one is there a better brand that i should use?
Any help is greatly appreciated. Oh, there are no codes at this time and the problem started a few days after changing the downstream o2 sensor. They were changed about a week apart, upstream first then downstream. Thanks for any input.
Everything I've seen online points to bad upstream o2 sensor. Just had it at emission check center and it passed but said gas cap was bad, they gave me a free one to replace it.
Is it possible a faulty gas cap can cause this? I don't think it can but you never know. If it is the o2 sensor and its a new one is there a better brand that i should use?
Any help is greatly appreciated. Oh, there are no codes at this time and the problem started a few days after changing the downstream o2 sensor. They were changed about a week apart, upstream first then downstream. Thanks for any input.