Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
My Answer is based on clues, symptoms and info in your question. Please include everything. Thanks
Hello I am pulling up testing on your code now. I can find you some procedures.
Vehicle drives just fine when not under load. When I try to jump on it, or am pulling a load, the P0093 code comes up when the truck tries to down shift, then goes into limp mode. As long as I can keep it under 2000RPM, the truck will keep going. I was on flat road pulling a hay trailer at 65 MPH just fine. When I hit a hill, I had to slow down to keep it under 2000 RPM. When the trailer was empty, I continued to get the same thing.
Performed the diagnostics based on fuel pressure in and out using the troubleshooting guidance online and it came up with the fuel pressure regulator sensor. I replaced that and wound up pulling a loaded car trailer at 70 mph on a flat road, but had the same problems empty and full as I did prior to the replacement.
Everything I see online points to the CP3 or the Regulator. The injectors were replaced at about 130K and I now have 169K on it. Trying to fix without replacing everything in a costly shotgun approach. If it looks like it will get into the thousands, then I may as well sell this one and get a newer one. Trying to figure out what to try, how to try it and what book time would be if I had someone do it. I have heared that the regulator can be replaced without removing the CP3 but do not know how extensive the work is. If it isn't the regulator, how much rework is involved if I replace the CP3.
Hi, I'm Cam. May I ask your first name? I see Dan is offline. I am working to get you a fast accurate answer. About your vehicle, there is a simple test to do to determine if the injectors are bad again or not.
Find the 2 fuel lines on the rear drivers side valve cover. Take the smaller one off and attach your hose to the metal pipe coming from the engine. Put the other end into the container and run the engine to fill that line. Then shut it off and remove the IGN 1 relay from beside the starter relay. empty out the container and keep the line full. Crank the engine for 15 seconds fully and measure the amount of fuel that comes out of that line. More than 40cc means the injectors have failed.
The pump and regulator often don't cause this so lets do this test first.