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SUVs Jeep Wrangler Jeep Wrangler Maintenance and Repair Questions (1997 - 2006)
1671 messages, Last post on Dec 02, 2009 at 9:42 AM
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Replying to: rtrunr (May 27, 2009 11:33 am) |
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At various times while driving in on the highway my jeep will start to buck , run rough and backfire. I pull over to the side of the road and let it idle or turn the engine off for a ew minutes then start it up and it runs fine for a while. The only time this happens is when I am on the highway, in 5th gear and not shifting. If I am driving, shifting and changing speeds it does not happen. Any ideas as to why this happens. Thanks
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Replying to: mjm1965 (Jul 01, 2009 9:27 am) -Paul
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Replying to: erickpl (Jul 01, 2009 10:36 am) No codes.
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Replying to: mjm1965 (Jul 01, 2009 5:03 pm) An illumination of the MIL is a cause for concern. It means that there's a problem that could possibly affect driveability. When the light comes on the PCM generates a code so that you can see what caused the light to come on. You do have codes, or at least one.
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Replying to: mac24 (Jul 02, 2009 3:30 am) I'd place my money on a throttle sensor. -Paul
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Replying to: erickpl (Jul 02, 2009 8:37 am) We had talked about it being the throttle sensor. This was the first time its happened in a while. I am going to check the code and dig into it this weekend. Mike
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Replying to: mjm1965 (Jul 02, 2009 9:07 am)  -Paul |
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I have changed a lot of things in this jeep I changed the water pump the radiator the computer the map sensor I have regular 30x9.50 15 tires I have put octane booster injector cleaner and no mechanic knows what is wrong with my car and i literally get 80 miles on a one tank of gassss... hellp .. black smoke comes out of it when i rev the engine and it takes me forever to get to the speed of the highway 
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Replying to: jeepmaniac13 (Jul 07, 2009 8:13 pm) While many things could cause this, the bottom line is that the poor mpg and black smoke indicate it's running a very rich fuel/air mixture. It could be as simple as a blocked air filter, or as complex as several bad sensors in combination with fuel system issues. Take it to a competent professional shop. |
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