My f350 has 190k mi.. I've done the maintenance on it, new cam sensor...

How do I confirm it is the injectors causing the motor to miss ?

Is replacing the injectors something the average guy can do ?

Thanks
Dave

 

There will be some good advise coming on this. It would be good to know if you have any codes showing up. You will need an advanced code reader like AE or a scangauge II to see the codes (there's another reader that escapes me). Post your location and possibly there is someone nearby who has AE and can help with a scan.

Definately want to troubleshoot this before injector replacement - Injector replacement is not difficult, just time consuming.

 

Welcome to FTE, lot of good knowledge here.

So the truck is idling rough, how severe is it, are the RPM'S jumping up and down? Can you only feel it in your seat, is their smoke blowing out of the tail pipe, is it start up only or constant? It's an expensive assumption but if you think it's the injectors the best way to check is a scan tool or an AE like Jeff posted and do an injector buzz test, or you can take a crayon and heavily mark the exhaust manifold at each cylinder and fire up the motor to see which crayon mark melts off, if the mark is still there you have a cold cylinder and that means a none working injector. Another way you can check is go and buy yourself a temp gun from Sears, Harbor Freight, Wal-Donkey (mart) and put the red laser light at the manifold closest to each cylinder same spot where the crayon would be marked and read the temperature, if one is cold and the rest is hot there is your bad injector.
The more info you can give the better we all can try and help diagnose your truck.

 

Welcome Dave.

There are many viable possibilities as to the cause of your rough running, or "miss" before jumping head first into injector replacement. Does it run rough all the time? Or just at certain times? Like maybe a particular speed of travel.
Is there a Check Engine Light (CEL) or Service Engine Soon light (SES)?
What brand cam sensor did you install?
What modifications, if any, are done to the truck?

 

Are you having cold start issues? That is one of the big indicators of bad injectors, but it could also be a lot of other things too. We need more info. Does it smooth out after it warms up?

 

It starts and idles well, as usual. When at cruising speed it will miss, run roughly. Then I put my foot in it and its ok. Its an occasional thing.

No modifications. I'll research the cam sensor. No change when I replaced it. No CEL or SES.

Nothing severe. Just not normal. How many miles do you normally get with fuel injectors?

This is great, thanks for the feedback
Dave

El Paso County, Colorado

 

The accepted answer on injectors is, there is no real answer. People say 180,000-200,000 and they usually will start showing signs. There are people with 300,000 miles on original injectors, I started having issues with mine @ 150,000. I just dropped my truck off this am to have new (reman'd) ones installed.

If you aren't having cold start issues, it's probably not injectors, it's something else. We have been having a rash of people posting lately with trash in their fuel tanks, or issues with the pick-up foot falling off in the tank. The screens in the tank being clogged. That could be something to look into, but I would guess you have a sensor going bad or that CPS is an aftermarket one and it's garbage.

 

414k miles on the 4 factory sticks that are still in Motorbug.
Just starting to see signs its time for a new set.

How old is your oil?
What kind are you running?

Any "blow by" when you take the oil fill cap off wjile the engine is running?

 

A little blow by is fine, correct? As long as it's not blowing the upside down cap off. Can't remember.