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Old 07-30-2012, 03:27 PM   #1
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Engine light anybody experience this??

Yesterday I installed new spark plugs (autolite xps) and installed new coils and also had my oil changed.

I just got back from lunch and the engine light came on... it drives fine though.

Anyone have any ideas on whats going???

Thanks

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Old 07-30-2012, 03:51 PM   #2
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Check the gap on the spark plugs. I'm having the same issue. I installed Champion spark plugs and when I went to start it up the check engine light came on as well. Seems to be skipping just a little bit and I remember looking at one of the plugs and thinking the gap was the same as the others

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Old 07-30-2012, 04:07 PM   #3
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Check the gap on the spark plugs. I'm having the same issue. I installed Champion spark plugs and when I went to start it up the check engine light came on as well. Seems to be skipping just a little bit and I remember looking at one of the plugs and thinking the gap was the same as the others
hmmm, well I changed them yesterday afternoon and drove around town to get a feel of them and it ran just fine and i drove to work this morning.. and during my lunch it came on...

the autolites were pre gapped at .0035. I didn't have the measurer to insure at the time I installed them though.

I guess I'll take the Jeep to autozone after work to have them check the code... I pray i didn't mess up my ride lol
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Old 07-30-2012, 04:20 PM   #4
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u should never install plugs without gapping. i've been amazed at the poor quality of the plug available.. u can get a 'gapper from az 4 a couple bucks that attaches to ur keychain...
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Old 07-30-2012, 04:24 PM   #5
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I guess I'll take the Jeep to autozone after work to have them check the code... I pray i didn't mess up my ride lol
Key the ignition on, off, on, off, on, and leave it on (not to start) for a few seconds. The odometer will display the code for you.
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Old 07-30-2012, 04:26 PM   #6
Knows a couple things...

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When regapping platinum or iridium plugs, be sure to keep the bending tool (I'm not talking about the feeler) positioned near the side and away from the gap itself or you risk damaging the coating.
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Old 07-30-2012, 04:38 PM   #7
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When regapping platinum or iridium plugs, be sure to keep the bending tool (I'm not talking about the feeler) positioned near the side and away from the gap itself or you risk damaging the coating.

thanks for the advise.

This was my first time installing spark plugs lol

I'm a new wrangler owner and was excited and wanted to do the work myself
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Old 07-30-2012, 05:38 PM   #8
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Nobody can truly help you until you decide to go out to your jeep and pull the code.
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Old 07-30-2012, 06:26 PM   #9
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I tried the on off thing amd it didnt work on mine- i too have the check engine light after changing my plugs but i think its a misfire as it sounds like its skipping now lol
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Old 07-30-2012, 07:20 PM   #10
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Went to autozone: this is exactly what was printed now I'm not a mechanic but it looks like I need to change my O2s?

Code: P0133

Slow response (heated oxygen sensor bank 1 sensor 1)

The power train control module uses oxygen sensor to calculate the air/fuel ratio in the exhaust.

Probable cause:

1) Oxygen sensor defective

2) fuel system runningg rich or lean-check other codes first.
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Old 07-30-2012, 07:24 PM   #11
Knows a couple things...

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I tried the on off thing amd it didnt work on mine- i too have the check engine light after changing my plugs but i think its a misfire as it sounds like its skipping now lol
Exactly how did you do it and how long did you wait for the codes after leaving it in the final On position? And what year TJ do you have?
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Old 07-30-2012, 07:32 PM   #12
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Quote:
Originally Posted by ninjaturtle0 View Post
Went to autozone: this is exactly what was printed now I'm not a mechanic but it looks like I need to change my O2s?

Code: P0133

Slow response (heated oxygen sensor bank 1 sensor 1)

The power train control module uses oxygen sensor to calculate the air/fuel ratio in the exhaust.

Probable cause:

1) Oxygen sensor defective

2) fuel system runningg rich or lean-check other codes first.
This sounds like it could be caused by what Rob had originally suggested as incorrectly gapped plugs.


My factory service manual only lists this code as:

1/1 O2 Sensor Slow Response...................................Oxygen sensor response slower than minimum required switching frequency.


Of course, I have a 2001 California model with extra catalytic converters, so this may not apply to your jeep.
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Old 07-30-2012, 07:35 PM   #13
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I just love Autozone's "diagnostics". They sell a shit load of oxygen sensors.
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Old 07-30-2012, 07:37 PM   #14
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Exactly how did you do it and how long did you wait for the codes after leaving it in the final On position? And what year TJ do you have?

At autozone it was plugged in for a while before the code appeared. I brought the plugs pregapped Im not sure if I didn't screw them in tight enough or what

I have a 2005 4.0 automatic

Auto lite xp sparks
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Old 07-30-2012, 08:32 PM   #15
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I found a site that gave instruction and followed it
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Old 07-30-2012, 09:02 PM   #16
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At autozone it was plugged in for a while before the code appeared. I brought the plugs pregapped Im not sure if I didn't screw them in tight enough or what

I have a 2005 4.0 automatic

Auto lite xp sparks
But did you check the gap on each? NEVER trust that they are correct.
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Old 07-30-2012, 09:10 PM   #17
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But did you check the gap on each? NEVER trust that they are correct.
I didn't check it was my first time changing sparks so I didn't think to check.

Is that something I should do?

Jeep dealer told me 100 just to do diagnose test I walked out
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Old 07-30-2012, 10:28 PM   #18
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Any help?
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Old 07-30-2012, 10:39 PM   #19
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Buy a gapper at an auto parts store. They're about a dollar or so. Each plug should be gapped to .035". If they're gapped too small, slide the gapper in between the electrodes until it's right. If they're gapped to big, hold the gapper between the electrodes while you use your thumb to press on the side electrode until it's against the gapper.
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Old 07-31-2012, 06:40 AM   #20
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Buy a gapper at an auto parts store. They're about a dollar or so. Each plug should be gapped to .035". If they're gapped too small, slide the gapper in between the electrodes until it's right. If they're gapped to big, hold the gapper between the electrodes while you use your thumb to press on the side electrode until it's against the gapper.


Thanks I'll try it later

The things that were done all on the same day were new spark plugs, new coils, oil change, then filled up the gas tank.
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Old 07-31-2012, 06:14 PM   #21
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At autozone it was plugged in for a while before the code appeared. I brought the plugs pregapped Im not sure if I didn't screw them in tight enough or what

I have a 2005 4.0 automatic

Auto lite xp sparks
The On, Off, On, Off, On will work on your '05. You probably just didn't get the timing right.

Gap the plugs just to be sure.

The Jeep ignition system prefers plugs that are the same material on each electrode. Either standard plugs or dual platinums. Not sure if the platinum and iridium on the XP will cause a problem or not. People have had issues with the single platinums.

However, I had the slow response O2 code on my '06 and had to replace the upper O2 sensors to fix it. Advance Auto had the OEM O2s for a good price.
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Old 08-01-2012, 09:49 AM   #22
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Update

Regapped the sparks last night... all 6 plugs had a smaller gap than .035. Pregapped my ass!

So gapped them correctly cleaned off really good and antiseized the threads. clicked the ign on and off a few times and the console will flash a couple of times to let you know engine light has been resetted and then let her idle for a few minutes...

So far no light but I will wait until after lunch since the light didn't come on until later the last time...
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Old 08-05-2012, 08:17 AM   #23
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Any updates?

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