Engine Misfire at highway speed?

[JWimberley]

Not sure how else to describe it, it feels like the engine is misfiring at highway speed. I'll have the cruise set at 75 and suddenly the truck lurches and the tach starts bouncing all over the place. It lasts for a second or two and the settles back out.

It threw the following codes:
P0340
P0344
P1316

This is a 2001 Excursion 7.3L 2wd with the Air Ram Intake and superchips tuning in tow safe mode. I was not towing when it happened. I'm concerned that driving it may do additional damage if it starts acting up again.

Any help is greatly appreciated. Also, if you know of a good trustworthy diesel mechanic in the Houston area please share...

Thanks,
Joshua

[Rodslinger]

Hey Joshua, welcome to Powerstroke.org! I'm going to bump this post until one of our tech's gets online to help you out. That should be any time now knowing these guys, they're great at helping folks out.
Where abouts are you in Houston? I'm in Katy and one of my buddies on here, gcop (Tony), lives down in Pearland.

[JWimberley]

I'm not far from you, just down Hwy 6 in Alief...

Thanks for the assist,

Joshua

[Rodslinger]

Sweet, yeah you're just down the road.

Here are the code readings - I'm sure one of the guys will be on here shortly to help.

P0340 - Fault Cylinder E-Misfire? Detected (CYL 4)
P0344 - CMP Sensor Circuit Intermittent
P1316 - Injector Circuit/IDM Codes Detected

[mschn99]

k, the cam sensor code could or could not be a cam sensor failing, but the IDM codes is a generic code. U can not deterimine what cylenders were at fault without running self tests, which require a decently pricey scan tool to use.....

i first would put a cam sensor in it, and put the one you have in your glove box. The one you have isnt completely dead yet, and if one does fail, it should at least get you back to civilization.....

Clear the codes and see if it acts up agian. if it doesn, you may have injector or injector harness problems.........Marc

[JWimberley]

Ok, I picked up the Cam Sensor at my local International dealership for $100 (better than O'Reilly's at $140 and the dealership at $180). Does anyone have a link to directions on locating and replacing this thing? I've got a Chilton's guide around the house somewhere but can't seem to put my hands on it right now.

Thanks,
Joshua

[mschn99]

http://www.powerstrokeforum.com/foru...play.php?f=138

[JWimberley]

Thanks guys!

With the help of the tech article I was able to get the truck up on the ramps, found the CPS and got it switched out with no trouble.

I appreciate the help and look forward to spending more time lurking in the forums as I continue to upgrade my Excursion!

Joshua

[mschn99]

cool man, let us know if that fixes it, or if we have something else to track down....and again, put that other cam sensor in your glove box. even if it is going out, it would at least get ya back to town if the one in it ever dies on you......sometimes they go with no warning and wont restart.......Marc

[JWimberley]

So far so good, she seems to be running just like normal at the moment...

Good point on keeping the old one in the glove box, might just save me a long walk one day

Just as an aside, I joined as a sponsor today because of the great and quick help that I got. You guys have a lot going for you on this website and I'm looking forward to being a part of it!

Thanks again,
Joshua