Just purchased a 1996 Powerstroke truck has 206,00 miles on it. Was driving down the road the other day and noticed it has a miss in it. Can really fill the miss until about 1500 rpms. Also can hear a loud ticking coming from cylinder #3. Thinking I have a bad injector. Shop performed a buzz test and all worked. They tried a contribution test and it would almost kill the truck and never start. Need some idea's guys. I have never owned a diesel until now.

 

Check fuel pressure while at idle and WOT in 3rd, should not drop below 45 PSI
low pressure can make them noisier
Check your armature clearance on that injector


do you own a scanner?

 

I don’t have a scanner but will check the fuel pressure.

 

Ohm it out according to this chart

 

Fuel pressure said about 45 to 60 roughly.

 

With the way noise travels how do you know its injector #3? I don't understand the "They tried a contribution test and it would almost kill the truck and never start"?

 

Using a mechanics stephascope the tick was loudest over that injector. When they tried to start the test the truck would stumble really hard. As soon as it did that the contribution test would just not run. We tried 4 times with the same result and two different shops tried it for me also with the same results.

 

The oil has to be nice and hot, like 200° or it will not pass.

 

Got the truck warmed up to do a contribution test. PO0272 is the code that came up with. Says it cylinder 4, which is what cylinder location. I have a scan tool to use all weekend if any other test are needed. Where do I need to go from here.

 

you cannot really trust the scope on these as the injector's are loud as hell.

 

#4 is driver side second from front, (see top pic in post 4) if time allows swap #4 and #6 and see if problem follows,

 

 

Check out Rosewood Diesel. They are a sponsor. Can't go wrong with them.

Red

 

Better to have them rebuilt by somebody who does it so they are flow matched.