Forums
New posts
Search forums
Image search
Shop
Amazon Store
T-Shirts
Stickers
Members
Current visitors
Supporting Member Upgrade
Sponsors
About
Log in
Register
Search
Search titles only
By:
Search titles only
By:
New posts
Search forums
Image search
Search
Search titles only
By:
Search titles only
By:
Menu
Install the app
Install
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Jeep Wrangler JK
JK General Discussion
P0303 engine code on 2008 Wrangler JKU
Reply to thread
Message
<blockquote data-quote="J U L I E" data-source="post: 465490" data-attributes="member: 26364"><p>Hi. My Jeep has over 223,000 miles on it. This has been a great Jeep! Recently, upon acceleration it started stuttering and misfiring, and I am pretty certain it gives a slight backfire when I mash the pedal. Check Engine light flashes, but does not stay on. It sounds like a John Deere tractor after that and at idle, lol. I have to keep it under about 45mph to keep it from stuttering and misfiring. I can drive it anywhere I want, as long as I don't hard accelerate and I drive like miss Daisy under 45mph, it runs totally fine.</p><p></p><p>We think we changed all parts that relate to the P0303 code:</p><p></p><p>Plugs, wires, coil pack, Fuel injectors.</p><p>In the last year, EGR valve, valve gaskets covers, head gaskets. Bank 1 up and downstream O2 sensors so far. I also have a new cat back, but did not do the Y pipe yet.</p><p></p><p>I have read one thread where there was a suggested bad lifter. I really hope that is not the case. Initially when we start it up, it idles very nice. I had always thought there was an infamous tick with a lifter going out. I have no tick at all in the engine. There is a weird new sound I hear upon start up, it is quick sound, I will see if I can attach the video on that. Then it sounds great, totally normal. As soon as we take it out for a test drive, same experience mentioned above. And then the CE flashes, but it does not stay on, and when we put the code reader to it , the P0303 code still comes up.</p><p></p><p>Poor thing, been such a good Jeep.</p><p></p><p>I need to get one more maiden voyage out of her before we bring it back into the OR for a LT swap. We are going to TN Jeep invasion in August and we won’t have time to do all that before we leave.</p><p></p><p>Anyone have experience with this? Appreciate your insight/suggestions.</p></blockquote><p></p>
[QUOTE="J U L I E, post: 465490, member: 26364"] Hi. My Jeep has over 223,000 miles on it. This has been a great Jeep! Recently, upon acceleration it started stuttering and misfiring, and I am pretty certain it gives a slight backfire when I mash the pedal. Check Engine light flashes, but does not stay on. It sounds like a John Deere tractor after that and at idle, lol. I have to keep it under about 45mph to keep it from stuttering and misfiring. I can drive it anywhere I want, as long as I don't hard accelerate and I drive like miss Daisy under 45mph, it runs totally fine. We think we changed all parts that relate to the P0303 code: Plugs, wires, coil pack, Fuel injectors. In the last year, EGR valve, valve gaskets covers, head gaskets. Bank 1 up and downstream O2 sensors so far. I also have a new cat back, but did not do the Y pipe yet. I have read one thread where there was a suggested bad lifter. I really hope that is not the case. Initially when we start it up, it idles very nice. I had always thought there was an infamous tick with a lifter going out. I have no tick at all in the engine. There is a weird new sound I hear upon start up, it is quick sound, I will see if I can attach the video on that. Then it sounds great, totally normal. As soon as we take it out for a test drive, same experience mentioned above. And then the CE flashes, but it does not stay on, and when we put the code reader to it , the P0303 code still comes up. Poor thing, been such a good Jeep. I need to get one more maiden voyage out of her before we bring it back into the OR for a LT swap. We are going to TN Jeep invasion in August and we won’t have time to do all that before we leave. Anyone have experience with this? Appreciate your insight/suggestions. [/QUOTE]
Verification
Post reply
Jeep Wrangler JK
JK General Discussion
P0303 engine code on 2008 Wrangler JKU
Top
Bottom