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  #1  
Old 11-24-2012, 12:20 AM
Alaskan Hemisport Alaskan Hemisport is offline
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Default Surging Idle and dying?!

Hello!

I have an 03 4.7, 140k miles. Since Ive had it, it has had a surging idle problem. It got to the point that it would rev real low at idle and then die. It would always start right back up, but sometimes it could be a fight to keep it on after starting. We replaced the spark plugs (those were really bad) and it improved the surging idle problem and it didnt die at idle for awhile.

Fast forward a month later. It is dying at idle again, and now it has even died while driving! Please, does anyone know what the heck is the problem??

The previous owner told me that the water pump had recently been replaced. Could something have happened, or been done wrong during that install that could cause this?
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Old 11-24-2012, 01:58 PM
Alaskan Hemisport Alaskan Hemisport is offline
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I just put a bottle of heat in (injector cleaner and removes water from fuel) fought with the truck to gett it started again. Had to give it a little gas to get it started and then to keep it going. Drove it around the parking lot and it ran fine. Went and parked, but now instead of fluxuating between 400-800 rpm, it was holding strong at 1100-1300 rpm. Before, if I reved it at idle at all it would die. I could rev it tI'll the limiter kicks in and it would go right back to 1100-1300rpm.

Last night it idled without surging at 1200rpm. This morning I go out and I have to give it gas to get it started again. I also had to give it a little throttle to keep it going After about 5 mins of that, it held idle between 400-800rpm
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Old 12-02-2012, 12:17 AM
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gweitz gweitz is offline
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It could be your throttle position sensor. My 02 started surging at speed on the freeway. I replaced the sensor and have not had a problem. Also take the intake plenum off and clean the throttle plates with some gumout cleaner.
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Old 12-02-2012, 09:01 AM
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Removing the entire intake isn't necessary. I prefer to remove the entire throttle body and IAC motor when cleaning up one but you can do this with everything still on the vehicle. Try this before you go throwing sensors or other non-maintainence related parts at it. This tutorial is a handy guide to the process. http://www.ramforumz.com/showthread.php?t=46454
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Old 12-03-2012, 04:26 PM
Alaskan Hemisport Alaskan Hemisport is offline
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I just cleaned my tb plates and the area around them, also took the air sensor out and cleaned that off, you couldn't really see it under the dirt. Still surging at idle. I have heard that if your upstream 02 sensor gets clogged with carbon it could cause similar problems. Where is the throttle position sensor and how much was it? If my intake manifold had a leaking gasket, could that cause it?
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Old 12-03-2012, 04:34 PM
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Your problem is not related to throttle position. It is a dirty idle air control assembly. It is located on the drivers side of the TB and is held on by one screw. Remove it with a T-20 Torx, clean it thoroughly with carb cleaner (scrubbing w/ toothbrush), re-install and enjoy.

Last edited by ccw; 12-03-2012 at 04:37 PM.
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Old 12-03-2012, 07:18 PM
Alaskan Hemisport Alaskan Hemisport is offline
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Now to find a garage. We are currently in a cold snap here. It is -40 and is supposed to stay this way for about a week.
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Old 12-05-2012, 02:54 AM
Alaskan Hemisport Alaskan Hemisport is offline
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Did the clean. It's doing better but it is still reving . I think I need to pull the TB and do a full deep clean. That idle assembly and housing was super dirty.
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Old 01-08-2013, 03:39 PM
Alaskan Hemisport Alaskan Hemisport is offline
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Took the TB off completely and cleaned out every nook and cranny. Replaced the TB gasket. Got a replacement idel air sensor from the junk yard and replaced it, but it must have been no good cause it ran terible after. I toom it out and took the o rings off the junk yard ond and out them on my old one since the old ones were all gummed up. It runs better but still does it. Could bad injctors, injector o rings or. A clogged up 02 sensor be my culprit? I dont have any CEL lights...
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Old 01-08-2013, 04:30 PM
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Quote:
Originally Posted by ccw View Post
Your problem is not related to throttle position. It is a dirty idle air control assembly. It is located on the drivers side of the TB and is held on by one screw. Remove it with a T-20 Torx, clean it thoroughly with carb cleaner (scrubbing w/ toothbrush), re-install and enjoy.
The Hemi doesn't have an IAC motor. Please don't offer advice when you don't know what you're talking about.
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