Cold Start Issues
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Mountain Pass
Joined: Aug 2007
Posts: 245
Likes: 3
From: Atlanta,Ga
Cold Start Issues
2006 F350, 176K miles, studded, gaskets, EGR modified, running well over all. As the temps have dropped I have some old issues coming back up and a new one as well. I have been having a #5 contribution code pop up during colder mornings for over a year but they were few and far between (I’ve been running an additive for stiction). This season it has become more consistent so I figure its time to replace #5. The new issue happened last week at cold start. Truck started and loped as usual and quickly leveled out. As I was waiting for it to warm up, it made a rattling noise that sounded like the engine was coming apart. It quickly corrected and ran normally. It did cause a code p0341 which is the cam position sensor and happened once again yesterday. Now for the questions. Is it better to replace all of the injectors on the same side at the same time? Is the p0341 code something of concern or something to monitor? CPS is a cheap part and appears to be a simple repair.
Thanks,
Scott
Thanks,
Scott
Fleet Mechanic
Joined: Nov 2016
Posts: 1,343
Likes: 94
Our 6.0 at around 220k miles also had intermittent contribution code. We replaced the one injector ran fine for another 5k, then another intermittent code started occurring. So we did the remainder on that side. Should have done them all the first time.
It ran much better then.
It ran much better then.
Postmaster
Joined: Aug 2015
Posts: 3,910
Likes: 18
From: NW IA
2006 F350, 176K miles, studded, gaskets, EGR modified, running well over all. As the temps have dropped I have some old issues coming back up and a new one as well. I have been having a #5 contribution code pop up during colder mornings for over a year but they were few and far between (I’ve been running an additive for stiction). This season it has become more consistent so I figure its time to replace #5. The new issue happened last week at cold start. Truck started and loped as usual and quickly leveled out. As I was waiting for it to warm up, it made a rattling noise that sounded like the engine was coming apart. It quickly corrected and ran normally. It did cause a code p0341 which is the cam position sensor and happened once again yesterday. Now for the questions. Is it better to replace all of the injectors on the same side at the same time? Is the p0341 code something of concern or something to monitor? CPS is a cheap part and appears to be a simple repair.
Thanks,
Scott
Thanks,
Scott
If you do #1 thru #5 then it's a good idea to do the other four not too far down the road. You will be surprised how much quieter and smoother this engine is with new remans.
For starters on your CPS, unplug it and gently blow things clean. It may just be contaminated. It's not unheard of for this simple trick to clear the issues up.
You can check the resistance as well. 800 to 1000 ohms is normal range.
Pull the center connector on the pcm - find Pin 31 and Pin 43 on the harness.
Measure the resistance between the PCM engine connector pin 31, harness side and the CMP sensor pin 1, harness side; and between the PCM engine connector pin 43, harness side and the CMP sensor pin 2, harness side.
Not a horrible job but it's a little tight in there. I think all you need is an 8mm with a flex and long extension. Takes a bit of tugging to get it out but there is some flex to those sensors.
You don't have to go by the book and take the PS pump etc out to do the job.
I'm betting the bucket of bolts episode with the engine was due to that CPS losing it's signal temporarily,
Logistics Pro
Joined: Jul 2014
Posts: 4,673
Likes: 532
From: Houston, Texas
I'd replace just the one. It's really not that much work, once you've done it one time, if you have to come back later. At $180+ each, I can do the 3-4 hours of work (only a couple of hours if you're good). Passenger side is a little harder to get the lower valve cover bolts out though. Also, if the bad injector is #5 or #7, you might want to check your fuel pressure (really, you should get an aftermarket fuel pressure gauge installed in your cab). Low pressure can burn up your injectors, and usually the ones farthest away from the fuel pump go first.
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Mountain Pass
Joined: Aug 2007
Posts: 245
Likes: 3
From: Atlanta,Ga
Thanks for the replies! I ordered a new CPS and will replace it. For $34 its a cheap replacement and I can do it myself. The injectors are different. I stopped by the local diesel shop and they recommended replacing all 4 at the same time. Quoted $1360 to replace all 4 so I'll get this done early next year. It looks like a fuel pressure gauge is going to be on my list of things to get done as well. I'll post results of replacing the CPS.
Thanks,
Scott
Thanks,
Scott
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