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  #1  
Old 08-27-2010, 10:14 PM
JohnL JohnL is offline
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Default Idle problems

I have a 2007 Dodge Ram 4x4, auto trans, 4.7 engine, 70,000 miles. Last week it started running a high idle when started, does not make a differance weather the engine is hot or cold, the out side temp was 90 the first time it did this. It will run about 1500 rpm for 20 or 30 seconds and then come down, in stages to 700 rpm. Sligh skip when doing this. Engine seems a little slugish and inside of tail pipe has black build up in it now. Gas milage seems about the same. Any ideas on what is causing this would be greatly appreciated.
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Old 08-28-2010, 03:40 AM
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Well first, welcome to the forum, since I see you're new here! Unfortunately, I don't have an answer for you, but we have a lot of knowledgeable folks here, so someone should be along soon who can help, but good luck and be sure to keep us posted! In the meantime, I hope you enjoy the site!

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Old 08-28-2010, 12:39 PM
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Hmm, not too sure on this one either, but here's another

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Old 08-28-2010, 02:49 PM
welshdog welshdog is offline
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Hi there, maybe it could be a faulty throttle position sensor (TPS).I had the same problem and it got progressively worse. Not an expensive job to replace,easily done yourself. Took me 20 mins.and cost $66. Hope this helps!
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Old 08-28-2010, 04:03 PM
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Could be TPS but first I'd clean the throttle body. Brake cleaner, a brush and little elbow grease.
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Old 08-30-2010, 06:48 PM
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Thank you for the welcome. Sat. afternoon I cleaned the throttle body, changed the spark plugs and replaced the TPS. I still have the high idle, but the engine runs a lot smoother, no skip. The check engine light has not come on and I have not been able to retrieve any codes from the computer. I suspect it could be a water temp.sensor. I will check it tomorrow. thank's John L
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Old 08-30-2010, 07:32 PM
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Also check for vacuum leaks
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Old 08-31-2010, 02:09 AM
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check and clean the IAC valve that could also contribute to your high idle
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Old 09-02-2010, 09:31 PM
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Cleaned IAC valve today, still have idle problem. Noticed valve stay's open about 15,000". Is this normal or should valve close tight when not powered? Could not find any vacume leaks. Thank's for the help. John L
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Old 09-03-2010, 11:20 AM
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Replaced IAC today, still had same problem. Unpluged ETS and idle went back to normal when started, temp gauge did not regrister though. Engine was at operating temp. Reconnected temp. sensor and gauge read but engine went back to high idle when started, 25 sec later idle dropped down to normal. Does sensor have more resistance on a temp rise or drop ?
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