# Misfire at idle speed **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chrysler, sebring\ **Created:** [October 22, 2010, 3:32am UTC](https://community.cartalk.com/t/misfire-at-idle-speed/56694 "2010-10-22T03:32:31Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![williamclang](https://avatars.discourse-cdn.com/v4/letter/w/6f9a4e/32.png) [@williamclang](https://community.cartalk.com/u/williamclang)\ **Post date:** [October 22, 2010, 3:32am UTC](https://community.cartalk.com/t/misfire-at-idle-speed/56694/1 "2010-10-22T03:32:31Z")
Our 2004 Chrysler Sebring with 119,000mi. has developed an occasional misfire at idle speed. The car has a 2.4L 4 cylinder engine and automatic transmission. The spark plugs are relatively new. No codes appear when scanned. Any suggestions? ---
**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\ **Post date:** [October 22, 2010, 1:41pm UTC](https://community.cartalk.com/t/misfire-at-idle-speed/56694/2 "2010-10-22T13:41:15Z")
I’d pull the plugs and have a look. What does “relatively” new mean? How about the spark plug wires? What about the rest of the maintenance items? Fuel filter? Checking the fuel pressure wouldn’t hurt. A check for vacuum leaks is also in order. ---
**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\ **Post date:** [October 22, 2010, 6:07pm UTC](https://community.cartalk.com/t/misfire-at-idle-speed/56694/3 "2010-10-22T18:07:50Z")
Try a bottle of Chevron fuel injector cleaner in the gas tank (I do this once a year). If that doesn’t help check the PCV valve. Next check the EGR valve for deposits that could be keeping it from closing completely. If all that fails get a compression test. ---
**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\ **Post date:** [October 22, 2010, 6:12pm UTC](https://community.cartalk.com/t/misfire-at-idle-speed/56694/4 "2010-10-22T18:12:09Z")
How old is relatively new? Miles and months? Are the plugs and wires OEM quality? Don’t assume those fancy plugs and wires are any better than OEM, they are mostly for looks not reliability. ---
**Author:** ![williamclang](https://avatars.discourse-cdn.com/v4/letter/w/6f9a4e/32.png) [@williamclang](https://community.cartalk.com/u/williamclang)\ **Post date:** [October 23, 2010, 2:05am UTC](https://community.cartalk.com/t/misfire-at-idle-speed/56694/5 "2010-10-23T02:05:07Z")
The plugs are about 4 months old and have about 6000 mi on them. It’s probably plug wires as I did not change them when I changed the plugs. What bothers me is no codes appear when the OBD is scanned. ---
**Author:** ![williamclang](https://avatars.discourse-cdn.com/v4/letter/w/6f9a4e/32.png) [@williamclang](https://community.cartalk.com/u/williamclang)\ **Post date:** [October 23, 2010, 2:07am UTC](https://community.cartalk.com/t/misfire-at-idle-speed/56694/6 "2010-10-23T02:07:40Z")
It could be the PCV valve. I didn’t think of that. I’ll try that and the injector cleaner. Thanks. ---
**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\ **Post date:** [October 23, 2010, 3:36am UTC](https://community.cartalk.com/t/misfire-at-idle-speed/56694/7 "2010-10-23T03:36:24Z")
I have often been fairly annoyed at how tolerant the PCM is of things that aren’t working quite right - wanting codes when I need them. ---
**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\ **Post date:** [October 23, 2010, 6:20am UTC](https://community.cartalk.com/t/misfire-at-idle-speed/56694/8 "2010-10-23T06:20:59Z")
My opinion is that the first step with an engine performance problem is to run a compression test to see if a cylinder is trying to drop. The spark plugs are out so weed any mechanical fault out from the get-go. If a cylinder is going down one could throw parts at it until oblivion. This could still be caused by plugs and/or wires. It’s quite possible, and common, to have misfires that will not set a code.