6 check engine codes?
Thread Starter
Junior Member
Joined: Mar 2012
Posts: 1
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6 check engine codes?
I have a 2005 f150 5.4 with 115,000miles. ive been having problems with rough idle, and it wont stay running it stalls almost every time it is at idle rpm. I got 6 check engine codes when i hooked i up. P0340,P0345,P0012,P0303, and i got P0340 and P0345 again. I changed the cps on both sides and im still getting the codes. I was wondering if anyone has had this problem and if so they could help me out some. Thanks
Senior Member
Joined: Sep 2011
Posts: 132
Likes: 2
From: West Virginia
Yeah, I you are right. According to this site (http://www.obd-codes.com/p0303), it is a miss in the third cylinder. You can run all of your codes on that site, and have a fairly good idea of what you need to fix.
Zack AKA Doctor guy
Joined: Feb 2011
Posts: 2,542
Likes: 5
From: norcal
I'd say change plugs and go from there maybe FPDM and fuel filter. Then probably oil change maybe bump up to 5w-30 since your over 100k. These trucks are all about oil pressure. I personally run 5w-30 Mobil 1 full synthetic and have been running that and my truck has no rough idle and it's been running great an much better then the day I got her at 88k. (I'm at 93,xxx miles)
Senior Member
Joined: Sep 2009
Posts: 106
Likes: 13
From: Katy, TX
Get the readings for each of the codes, do a quick search and write down the symptoms - these will not always tell you the cause!
If you have always used 5W20 oil, stick with it and use a Motorcraft filter, don't use FRAM.
Agree that the plugs should be removed and inspected at least, but if you are going to that effort, change them anyway.
Disconnect the battery and turn on the headlights to drain any residual power in the ECU and system, then turn the switch back off.
Check and clean all the Coils and perhaps invest in a new one to try on the cylinder with the misfire. You may need more.
Remove the air filter (and change it) and inlet housing to inspect yout throttle body, be ready to remove and clean it with some throttle body cleaner, clean out the contacts on the connectors.
Check all the vacuum hoses and PCV connections whilst you are there.
Re-build it all and re-connect the battery and start the truck, let it idle for a minute or two and re-learn the throttle position, then drive normally for 10 minutes to adjust the settings.
If you have always used 5W20 oil, stick with it and use a Motorcraft filter, don't use FRAM.
Agree that the plugs should be removed and inspected at least, but if you are going to that effort, change them anyway.
Disconnect the battery and turn on the headlights to drain any residual power in the ECU and system, then turn the switch back off.
Check and clean all the Coils and perhaps invest in a new one to try on the cylinder with the misfire. You may need more.
Remove the air filter (and change it) and inlet housing to inspect yout throttle body, be ready to remove and clean it with some throttle body cleaner, clean out the contacts on the connectors.
Check all the vacuum hoses and PCV connections whilst you are there.
Re-build it all and re-connect the battery and start the truck, let it idle for a minute or two and re-learn the throttle position, then drive normally for 10 minutes to adjust the settings.