I am new on this forum but have benefited from your expertise before. I have a 03 F350 7.3 stock, no power programers. I had a check engine light intermittently come on during a trip. Came home and took it to have codes read. The mechanic said injectors 3 and 8 needed replaced. Truck never ran different still had power and no roughness in the engine. After reading some other posts on the CPS and I have the gray one, could it be just the CPS or should I replace injectors? Any help is appreciated, Thanks

 

Try cps first.
I have had good and bad luck with all but the original black international cps... that one seems almost bulletproof.

#3&#8 injectors popping on a cct is indicative of a cps issue.
In many cases it is just a "ghost" code.

 

If an injector isn't firing you will know. cam sensors where a common problem on the late model trucks, go with that, rescan and see what the pcodes are coming up. they should tell you what codes they are. another area always missed is the wiring in the valve covers, the can kill and injector randomly, set codes, sometime wires chaffing along the valve cover happens as well. give it a good look over, doing those injectors is a pain in the ***. and if your going to do 2 do all 8 and get it over with, I have over 250,000 miles on my late model 99 and never had an injector go. David7.3

 

Thanks, I'll start with the CPS first

 

Got ya beat...
5 of my injectors are factory originals with 420,000 miles on them.

Its only a p.i.t.a. if its your first time doing it.
Im down to 2 hours or so from start to finish.

More times you do it... more tricks you learn to make it go faster.

I realize not everybody lives and breathes to wrench on these trucks...
So multiple trips under the vc's arent for everybody... but you get the idea.

 

I would also consider a new mechanic for future repairs. The fact that he didn't consider the CPS means he is not familiar with the engine, and may not have the most optimal repairs in the future.

Doesn't count if they aren't all original

 

By your screen name I've got to ask if you're in SE Michigan or not. If so we have some good smart guys in the area.

 

Oh come on Trey...
The ones that were swapped out were #'s 1,3, and 8...
So you know what that means... they were probably perfectly fine... just popped the codes on the cct when Chuck had it read and he just let them do whatever.

 

Rebound Question! Can (and how) I do a fuel injector self test, aka "buzz test", without some specialized computer equipment?

 

You will need to acquire a specialized computer.

HINT: AutoEnguinity converts any laptop to a specialized computer

 

Or an Android device with Bluetooth, a Bluetooth OBD adapter and - even though I hate the user interface - the Car Gauge Pro app.

 

Has that received a stamp of approval?

Tugly said it fried his PCM or was that some external cause...

 

It didn't fry anything as far as I know. I remember he had to disconnect batteries after a problem with it at one point.

 

There was no permanent harm to the truck, but the Car Gauge Pro buzz test definitely put Stinky in a weird mood. Doing a KOEO with AutoEnginuity gave him an attitude adjustment, and everything was back to normal.

I won't say anybody else will have the problem I did - it could have been something unique to my hardware/firmware/chip/mods/adaptor combination.

I will agree with Pikachu - that user interface scream "get it to market, screw how it behaves".