No CEL Misfire

Black_GT · January 17th, 2012, 02:16 PM

My car just started misfiring. It was running perfectly fine and i went to put gas in it and when i left the gas station it felt like it was missing. There is no check engine light does anyone know what could cause this?

laoutlaw01 · January 17th, 2012, 07:05 PM

Bad gas for one. Run some seafoam thru it.

tjpinkston · January 17th, 2012, 08:15 PM

Try cleaning your maf. I get a random miss if mine is dirty

bulloch27 · January 18th, 2012, 09:01 AM

A misfire due to a COP issue will rarely trigger a CEL. The best way to determine if you have one or more faulty COPs is to perform a cylinder contribution test on a OBDII computer that more than likely you don't have access too. That being said I lean toward bad gas or water laced gas since the problem started after fill up. I like the SeaFoam idea and I use it fequently in all of my gas powered engines.

Lefty · January 18th, 2012, 09:19 AM

Sounds like a case of bad fuel as well.

January 17th, 2012, 02:16 PM	#1
Black_GT Newbie 1992 Mustang GT Join Date: Dec 2011 Location: Kansas City, MO Posts: 39 iTrader: 0 reviews	No CEL Misfire My car just started misfiring. It was running perfectly fine and i went to put gas in it and when i left the gas station it felt like it was missing. There is no check engine light does anyone know what could cause this?

January 17th, 2012, 07:05 PM	#2
laoutlaw01 Regular Join Date: Oct 2011 Posts: 381 iTrader: 0 reviews	Bad gas for one. Run some seafoam thru it. __________________

January 17th, 2012, 08:15 PM	#3
tjpinkston Regular 2000 ??? Join Date: Aug 2010 Location: locust nc Posts: 106 iTrader: 0 reviews	Try cleaning your maf. I get a random miss if mine is dirty __________________ 2000 roush stage 2 novi 2000 @ 15 psi. forged shortblock. Svo Focus pump and bap

January 18th, 2012, 09:01 AM	#4
bulloch27 Hardcore Enthusiast 2003 Mustang Fauxbra N/T @ Fast Join Date: Jan 2011 Location: Statesboro, Ga Posts: 2,879 iTrader: 0 reviews	A misfire due to a COP issue will rarely trigger a CEL. The best way to determine if you have one or more faulty COPs is to perform a cylinder contribution test on a OBDII computer that more than likely you don't have access too. That being said I lean toward bad gas or water laced gas since the problem started after fill up. I like the SeaFoam idea and I use it fequently in all of my gas powered engines. __________________ All the typical bolt-ons, well a lot are welded on. Bone stock I tell ya. First time at the track, what do I do now? 03 Silver Fauxbra; 06 Legend Lime GT, 89 Outwlaw 10.5W Coupe, 93 Teal Cobra, 93 Red GT, 93 Teal LX - All Sold

January 18th, 2012, 09:19 AM	#5
Lefty Resident DJ '01 Cobra Vert. Join Date: Jun 2007 Location: Mechanicsburg, PA Posts: 28,701 iTrader: 12 reviews	Sounds like a case of bad fuel as well. __________________ 2008 Acura TL Type-S (the daily) 2006 Yamaha R6 50th Anniversary Edition (the other toy)

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