Multiple misfires, case of bad gas?
#1
Registered User
Thread Starter
Multiple misfires, case of bad gas?
So a couple of weeks ago I put in a full tank of gas at Mobil. Since then the car has been idling very badly (idling at 1500 -2000) and is very hesitant from an idle. There is also a popping noise coming out of the idle, and a CEL came on. I checked the codes they are P0300, P0301, P0302,P0303, P0304, and P1399. Multiple misfires.
Could this be a case of bad gas? I never had a problem before filling it up. If it is bad gas, how do I get it out. I have near a full tank of gas in there. Thanks for the help.
Sri
Could this be a case of bad gas? I never had a problem before filling it up. If it is bad gas, how do I get it out. I have near a full tank of gas in there. Thanks for the help.
Sri
#4
Registered User
Hmm, everything was fine and now misfires on all cylinders. I would think bad gas could be a likely candindate. A Misfire can be caused by many things though. The dealerships usually start the troubleshooting process by ruling out bad gas anyway, so it seems it would definitely be the best place to start. Good Luck
EDIT: The CEL/MIL isn't flashing is it?
Old school syphon? I don't really know, never had to do it.
EDIT: The CEL/MIL isn't flashing is it?
how do I get it out. I have near a full tank of gas in there.
#5
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Location: garland, tx
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I doubt it's the case of bad gas since you had already run that tank empty and than filled it up with another full tank....right? If so than you can't be that unlucky to have 2 fill up with bad gas in a row. Check your spark plugs first to see if it rich or lean or if it going foul....that could lead to the misfired. Misfire cause by air and fuel not matching up. So, check your map but i lean toward the IAC. Take the iac out and clean it with wd-40. As for taking bad gas out of your tank....well, just use a long tube....stuck one end into the gas tank and then shuck it out with your mouth. Just make sure don't keep the tube stuck in your mouth once the gas is flowing through it
#6
Former Moderator
It's more than likely your injectors. Replace with new oem.
See this thread:
https://www.s2ki.com/forums/index.php?showtopic=292304
Very long...cliff's notes: bad injectors.
See this thread:
https://www.s2ki.com/forums/index.php?showtopic=292304
Very long...cliff's notes: bad injectors.
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#8
Former Moderator
Originally Posted by SenderGreen,Jul 15 2007, 04:22 AM
Is it common for all four injectors to fail at once? What about all four plugs or coils? Seems like it would have to be major coincidence
EDIT:Well I see it happened to the guy in the thread you linked. So I'll just be quiet then.
I still think bad gas should be the first/cheapest to be ruled out though. Also what could cause four injectors to foul at once? I keep thinking bad gas.
EDIT:Well I see it happened to the guy in the thread you linked. So I'll just be quiet then.
I still think bad gas should be the first/cheapest to be ruled out though. Also what could cause four injectors to foul at once? I keep thinking bad gas.
Brand new oem injectors solved the problem.
Have not heard much about plugs or coil packs going bad on our car, but many have had the missfire lead to the injectors.
#9
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Join Date: May 2007
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This same thing happend to me today!!!! I filled up on some gas from some place and in like 20 min the check engine light came on. Same exact codes P0300 P0301 P0302 P0303 P0304 And P1399. The place I used to fill up was a place that has switched to 10% ethanol. i dont know if thats the problem or not. I just know the same thing had happend to me today
#10
Moderator
Bad gas can definitely cause misfire codes.
I didn't read that you refilled with different fuel, so I'd start there. Save that fuel for the wife's car
I didn't read that you refilled with different fuel, so I'd start there. Save that fuel for the wife's car