2004 Santa Fe 3.5 Won;t hold Idle - Hyundai Forum - Hyundai Enthusiast Forums

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Old 02-08-2010, 12:36 AM
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Join Date: Aug 2008
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Default 2004 Santa Fe 3.5 Won;t hold Idle


Need some input on a recent problem that popped up.

After about 2 hours driving on the freeway to home this evening, I stopped the car at a traffic light and the card died. I tried to re-start but wouldn't start, hold idle.

So, I started it again, this time with a bit of throttle and it started, but wouldn't hold idle without some throttle applied.

Anyone with experience on this, guess?

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Old 02-09-2010, 09:37 PM
Join Date: Dec 2008
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Posts: 38

will it run at wide open throttle?? if so, then mash on the gas up to rev limiter (or even more if you wish, i won't tell...). you may have dislodged a piece of carbon into the egr system from the long cruise. this sort of thing can happen from time to time. i suggest a top engine cleaning, or some sort of fuel injection service (no, not the stp mechanic in a can pour it in the gastank and everything will be fine stuff). i suggest a 'motor-vac' by snap on. there are several service centers that use these, or the b&g units, either one will give you a far better service than the bottles of mystery oil on the shelves in the stores.

if it doesn't run at wide open throttle, then you may have other issues, but i think it will be carbon. you chould also have the throttle plate cleaned as well.

hope this helps.

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