Heavy Equipment Repair Questions? Ask an Expert Now.
Hi. Thanks for using JA! I will try and help you out.
The first thing I would recommend to do (if you haven't already) would be to go back through the over head. Anyone can make a mistake, you may have adjusted something on the wrong engine position.
As far as the 130 psi fuel pressure, it should not cause this problem.
Did this start out with the engine just having a "Miss" on number 4?
Thanks for the information.
How long have you let the engine run? The reason I ask is because if it is only for a short time, possibly the STP is in the fuel system and just needs to be ran out.
I would think that 10 to 15 minutes would be long enough to get rid of air and/or STP.
Have you been back over the overhead?
If you have been back through the overhead and it is correct, you may have to remove the injectors and inspect. Since the engine was not smoking like this until the injectors were removed, there may be a cut O ring on one of the injectors.
Each injector has what is called a "Trim Code" on it. When ever an injector has been replaced, this code must be changed in the ECM. However, I can't say I have ever seen an incorrect trim code cause an engine to smoke though.
Get me your complete engine serial number and the part number of the injector. I can find out if it is the correct one.
The 10R8501 is the correct part number for your engine.
Maybe you should go ahead and drop the exhaust manifold and see if the smoke is coming from number 4?
If it is not, at least we will know that the problem is not the injector. If it is smoking on number 4, they may have gave you a faulty injector.
So what exactly did they do re increase the fuel pressure?
I'm not sure I follow what you are saying. Could you elaborate on:
they said they had to go into the computer and make changes to make it seem like they were changing the injector??????
I see. They put the new spring in the transfer pump. I am aware of this. But they should not need to adjust anything in the ECM.
This new spring was just designed to weaXXXXX XXXXXke before. This in turn helps the system maintain adequate pressure in the system in order to keep the injectors full after injection.
If they did change something in the computer, it could very well be a problem with now replacing #4 injector.
Unfortunately, there is no place other than on the dash of the truck to connect tooling. Sorry.
If they hooked up out near the ECM, they would have had to use a bypass harness. Cat makes a bypass harness that connects directly to the ECM. It connects where the truck harness connects to the ECM.
The bypass harness is used whenever there is a problem using the dash connector.