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post #1 of 31 (permalink) Old 05-13-2010, 08:39 AM Thread Starter
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Check Engine Light

I just got my car 2 weeks ago...and the check engine light came on this morning. I checked the gas cap and it was tight...what else could it be???
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post #2 of 31 (permalink) Old 05-13-2010, 08:48 AM
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More then likely it is the gas cap (especially if you recently had a huge temperature swing, like we did here in Philly this past week). Take it off, wipe the filler neck rim and the cap O-ring off (there could be some dust/dirt not letting it seal properly) with a damp paper towel, and put it back on a few clicks. It may take several start/stops of the engine before it resets the light though (5 key on/off cycles sticks in my head). If it does not go out though, try Advance Auto or AutoZone, they read codes for free (if the jeeps not under warranty) then post the code back here so we can help. Good luck!

-Todd
08 Sport 4x4 FDI Silver, CRD Stu's Coil Springs, Mud Flaps, Weathertech vent shades, TAG Rear Bumper
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post #3 of 31 (permalink) Old 05-13-2010, 10:05 AM
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If it's the Gas Cap you will get a bell sound about 10 seconds after starting the car and then GAS CAP will scroll across the odometer in funky letters. Tighten the Gas Cap 7 clicks and it will stop.
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post #4 of 31 (permalink) Old 05-13-2010, 11:28 AM Thread Starter
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I didn't get the gas cap message...
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post #5 of 31 (permalink) Old 05-13-2010, 10:33 PM Thread Starter
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It was just the gas cap...i tightened it and the light went off. Thank you!
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post #6 of 31 (permalink) Old 06-12-2010, 04:14 AM
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I got a check engine light this spring. The gas cap was OK. My scan gauge said that it had a code which came out to "problem with the temperature sensing system". I had used my engine block heater on a morning which wasn't that cold. I think that when I started the engine the computer saw the engine as being significantly warmer than the intake air temp after sitting for more than eight hours and said "Wrong". After three or four cycles of having it shut down for more than eight hours, the light went away.


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post #7 of 31 (permalink) Old 09-17-2010, 10:39 PM
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My GASCAP came on yesturday.. I had a very empty tank and put 20 liters in.. Been there.. Today I went and filled up on gas and turned on the ignirion, GASCAP came on and dissapeared a second later!!! Hehe!!!

But check engine came on today in the afternoon while the GASCAP light was still on. I think it happened after I slammed the brakes as the dude infront slammed his... That's when I notice the check engine light come on.

Though even though the gas light is off the engine light still remains ;(

Called Jeep and they told me as long as car drives then its fine and if still on after the weekend than to come in.

Parts source offer free code reading, but do you think they can mess things up? I may go to them tommorow.
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post #8 of 31 (permalink) Old 09-17-2010, 10:41 PM
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Forgot to add.. Jeep mentioned on the phone that both check engine + Gascap light can be on for the same reason... Weird eh?
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post #9 of 31 (permalink) Old 09-18-2010, 10:07 AM
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The light went away this morning, guess its related to the Gas light
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post #10 of 31 (permalink) Old 06-09-2011, 10:30 AM
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just purchased a 2007 patriot 2 days ago, 28K miles, light came on yesterday......autozone just hooked up the computer and it said cylinder 1 misfire. disgusted to say the least
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post #11 of 31 (permalink) Old 06-09-2011, 10:35 AM
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Quote:
Originally Posted by cinnepa View Post
just purchased a 2007 patriot 2 days ago, 28K miles, light came on yesterday......autozone just hooked up the computer and it said cylinder 1 misfire. disgusted to say the least
cinnepa, it could be you just need to change the spark plugs. Patriots use standard copper plugs, no long life platinum's here. They should be changed every 30k miles, so you are right near the limit. Make sure who ever changes them uses die-electric grease in the rubber spark plug boots liberally.

-Todd
08 Sport 4x4 FDI Silver, CRD Stu's Coil Springs, Mud Flaps, Weathertech vent shades, TAG Rear Bumper
Carr Lightwing, Pilot Navigator Driving Lights, K&N Air Filter and a jp.com decal

Quote:
"Nothing is either good or bad, but thinking makes it so."
- William Shakespeare

"I swear to drunk I'm not God!"
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post #12 of 31 (permalink) Old 06-09-2011, 10:38 AM
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Quote:
Originally Posted by h3nry8888 View Post
The light went away this morning, guess its related to the Gas light
With OBDII cars, the light can turn itself off if it no longer detects the fault for a certain amount of key on-off cycles. So if the cap is loose, the light won't go off right away once you tighten it back on. It may be 5 to 10 trips later.

-Todd
08 Sport 4x4 FDI Silver, CRD Stu's Coil Springs, Mud Flaps, Weathertech vent shades, TAG Rear Bumper
Carr Lightwing, Pilot Navigator Driving Lights, K&N Air Filter and a jp.com decal

Quote:
"Nothing is either good or bad, but thinking makes it so."
- William Shakespeare

"I swear to drunk I'm not God!"
- Anonymous
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post #13 of 31 (permalink) Old 06-13-2011, 09:24 AM
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back to dealer tomorrow, they changed plugs last thursday....friday around lunchtime, light came back on after a quirky shift i made. turned jeep on, pulled out of parking space in drive, drove a hundred feet maybe....stopped, put in reverse to let someone else out then right back in drive (the reverse then back to drive took about 10 seconds).....just after this the engine light came back on, and has not gone off since. took to autozone again; same analysis - "cylinder 1 misfire". jeep runs fine, could it be maybe something electrical??
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post #14 of 31 (permalink) Old 06-13-2011, 09:39 AM
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It could be the rubber boot on the coil. If they don't seal properly to the plug they can actually fire the spark sideways into the spark plug tube that everything sits into the head on. Die-electric grease helps seal the boot and give a high resistance path. Once they start arcing like that they tend to leave carbon tracks on the boots and the ceramic insulator of the plug (little black lines) and each time it gets easier for the arc. Or the coil itself could be going bad. If you can switch #1 coil with #4 (two outermost coils), give that a try and see if the code changes to #4 misfire.

-Todd
08 Sport 4x4 FDI Silver, CRD Stu's Coil Springs, Mud Flaps, Weathertech vent shades, TAG Rear Bumper
Carr Lightwing, Pilot Navigator Driving Lights, K&N Air Filter and a jp.com decal

Quote:
"Nothing is either good or bad, but thinking makes it so."
- William Shakespeare

"I swear to drunk I'm not God!"
- Anonymous
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post #15 of 31 (permalink) Old 06-13-2011, 09:47 AM
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^^^thanks much, will pass info on.
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