Any ideas on why RPM need would bounce and check engine light come on for a few seconds?


Asked by Jun 04, 2013 at 07:31 AM about the 2005 Kia Optima

Question type: Maintenance & Repair

RPM needle drops down to 0, bounces and then goes back to normal while going 50-70mph. When the needle goes back, the check engine light comes and then turns off a couple seconds later. I can feel a slight change when light comes on and off, like I pulled my foot off gas for a split second.

Took it to a mechanic and when he ran the check engine light codes there was nothing registered. Took it to him while check engine light was on and he said it was a misfire in cylinder 1 and 2. Replaced the throttle position sensor (tps), coils, spark plugs and plug wires. Got the car back today and it is still doing it.

Please help!!! This has been going on for a few months now and still no answers. Thank you!

Kia Optima 2005, 120k miles

8 Answers

Tom Demyan

Without knowing the codes, I can't help much besides telling you to take it back to your mechaninc and tell him he didn't fix the problem. You can scan for codes without the light on BTW. They are stored in memory until cleared.

1 out of 1 people think this is helpful.

i had the exact same problem today, mine is a 2003 optima with 140k miles on it

5 out of 5 people think this is helpful.

We finally got it fixed and it was a faulty ignition sensor. Hope that helps your KIA! Good luck. It was the oddest thing that it never saved on the check engine light codes, but after over a month of it acting up my mechanic figured it out. Runs great again now.

4 out of 4 people think this is helpful.

thanks! in the past few weeks, the needle would drop for a second, and id lift my foot off of the gas, and it would be fine, but today it shut down completely to where i had to pull over and restart. ill have it checked out and repaired. thanks again for the info

2 out of 2 people think this is helpful.

hello adierks3- would that be the same as ignition failure sensor?

2 out of 2 people think this is helpful.

Yes that was it, sorry.


Had loss of power for a short time and engine light came on. Went away, then came back. Tachometer had intermittent operation. Instead of going through the troubleshooting steps of measuring opens/shorts, etc., replaced ignition failure sensor. $92. Check engine light not on anymore and car seems to run fine. Tachometer behaving well again.

Antonnette Hoskin

My 2013 optima is doing it now, but no check engine light came on. Took it back the the dealership where I got it from and they don't know what's wrong with it. They had my car for 4 days and could not figure out what was wrong with my car. Then taday it happened again. I have to take it in on Monday to see why this keep happening.

1 out of 1 people think this is helpful.

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