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2002 Hyundai Elentra GLS Hesitation/Rough Idle
07-14-2014, 08:50 PM (This post was last modified: 07-14-2014 08:53 PM by app5774e.)
Post: #1
2002 Hyundai Elentra GLS Hesitation/Rough Idle
I just bought A 2002 Hyundai Elantra GLS. It has kind of a rough idle when at idle. It also hesitates when I accelerate. If i go "wide open" the engine light blinks, Then goes off. Any info will help. Thanks
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07-14-2014, 09:16 PM
Post: #2
RE: 2002 Hyundai Elentra GLS Hesitation/Rough Idle
The blinking engine light is a warning that it's running bad enough to damage the cat converter. I would check the trouble codes and post them here for us to review. Also have them cleared and see if the light comes back on or if more codes are stored in a few days. Those will be the codes we are most interested in. Knowing the exact code numbers is critical to pin pointing the issue.
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07-14-2014, 10:50 PM
Post: #3
RE: 2002 Hyundai Elentra GLS Hesitation/Rough Idle
(07-14-2014 09:16 PM)Rupe Wrote:  The blinking engine light is a warning that it's running bad enough to damage the cat converter. I would check the trouble codes and post them here for us to review. Also have them cleared and see if the light comes back on or if more codes are stored in a few days. Those will be the codes we are most interested in. Knowing the exact code numbers is critical to pin pointing the issue.

Cyn 4 misfire...didn't write the exact code # down.
Thanks.
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07-14-2014, 11:25 PM
Post: #4
RE: 2002 Hyundai Elentra GLS Hesitation/Rough Idle
Ok, that's a good start so let's fix that and see what happens. It's going to be only a few possibilities and I will list them.

Bad ignition parts (plugs, wires, cap, rotor, coil pack)
Large vacuum leak (broken hose or fitting)
Bad injector (clogged or stuck open?)
Low compression in one cyl. (valves, rings, other mechanical)

Since it's a 12 year old car I'd guess it's got some miles on it and if it hasn't been tuned up in years I would start there at the top of the list. As you pull the plugs out note the color of each one and specifically #4. A white color will indicate a clogged injector or a large vacuum leak near that cyl. A black plug indicates a rich mix due to a stuck open injector. If they are all black there may be other issues but could still be a vac leak causing the system to compensate. If the plug is just fouled with crud it may be old age or an oil useage problem in a single cyl. If you have the right stuff then do a compression test while the plugs are out. It wont be perfect since it hasn't been running right but hopefully they are all over 100 psi, which is a good start.

If it runs better after a tune up then get the codes cleared and see if the light stays off.

Let us know how you make out.
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