What is a P1093 code?
P1093 – Fuel Rail Pressure Low During Power Enrichment. This could be caused by a plugged fuel filter.
What is normal fuel rail pressure on a Duramax?
For starting a Duramax, you’ll need a minimum of 1,500 psi fuel pressure at the rail while cranking and at idle a minimum of 5,000 psi.
How do I know if my fuel pressure regulator is bad on my Duramax?
The symptoms of a bad regulator usually manifest as a surge when idling, though sometimes the surge can happen at speed while driving. Other symptoms include power loss on acceleration or hard starting. Sometimes it can get bad enough to force the truck into limp mode with a low rail pressure warning.
What should lb7 fuel rail pressure be?
Note that the fuel rail pressure is at 24,053 psi. As stated previously, the fuel pressure with the Ignition relay unplugged needs to be a minimum of 2500 to 3500 psi during cranking for the return rate test results to be valid.
Where is the fuel rail pressure sensor located on a 6.6 Duramax?
The sensor is mounted on the right fuel rail under the EGR Cooler.
What is code P0087 Duramax?
The codes pop up on a Duramax when there’s low fuel rail pressure: P0087 or P1093. Usually, the truck is performing at its maximum and unable to keep up with what’s commanded. The common rail fuel system operates at 28 – 29,000 psi and needs to drop only 2,200 psi to trigger the trouble code.
What are the signs of a bad fuel regulator?
Usually, the following symptoms indicate a faulty fuel pressure regulator.
- Engine Misfires and Decrease in Power, Fuel Efficiency and Acceleration.
- Fuel Leaks.
- Black Smoke Emitting From the Exhaust.
- The Smell of Fuel from the Dipstick.
- Engine Malfunction.
- Noisy Fuel Pump.
How do I know if my fuel pressure regulator is bad?
Symptoms Of A Bad Fuel Regulator
- Engine misfires/poor acceleration.
- Black smoke coming from the exhaust.
- Spark plugs appear black.
- Reduced fuel mileage.
- Gasoline in the vacuum hose.
- Engine backfires.
- Engine won’t crank.
- Excessive fuel pump noise.
What should fuel pressure be on 04 Duramax?
Before we move on to the testing procedure, let’s just point out that the pressure should be around 2500 to 3500 PSI in the high-pressure fuel pump while cranking the engine to make the outlined test valid.