Why is my diesel engine surging at idle?
Why is my diesel engine surging at idle?
Fuel Pressure Regulator (FPR) is a device that is in charge of making sure the rail pressure is where it should be. Using a scan tool you can compare desired and actual rail pressures to often determine if there is a problem. If the engine is surging at idle (RPM fluctuations) it is a good indicated of a bad FPR.
What kind of problems does a Duramax engine have?
The 5 Most Common LB7 Duramax Engine Problems 1 Fuel Injector Failure 2 Water Pump Failure 3 Fuel Filter Housing O-ring Leaks 4 Blown Head Gasket 5 Overheating (fan clutch problems, radiator gunk)
Why does my truck keep loping at idle?
I was reading old posts over at the place and some suggested that it was a bad fuel rail pressure regulator (FRPR) or it could also be a loose reluctor wheel on the crankshaft sensor. Anybody have any ideas on what it would for sure be?
Are there any problems with the Duramax LB7 diesel?
Since the LB7 is a bit behind the performance curve compared to more modern diesel engines, performance modifications are common. Once you reach the 550rwhp mark, the LB7 is very prone to bending rods and also snapping crankshafts. Additionally, more power requires more fueling and more cooling.
Fuel Pressure Regulator (FPR) is a device that is in charge of making sure the rail pressure is where it should be. Using a scan tool you can compare desired and actual rail pressures to often determine if there is a problem. If the engine is surging at idle (RPM fluctuations) it is a good indicated of a bad FPR.
What should the fuel pressure be at idle?
Watching the fuel pressure at idle stays around 5200psi and when it surges up goes to around 9000psi. It’s up and down about every 15 seconds. And you can also feel it at a slow speed. Could someone lead the right direction, I do automechanic by trade I just don’t do a lot of diesel work. Thanks for the help fuel pressure regulator.
I was reading old posts over at the place and some suggested that it was a bad fuel rail pressure regulator (FRPR) or it could also be a loose reluctor wheel on the crankshaft sensor. Anybody have any ideas on what it would for sure be?
What does loping or surging at idle mean?
CLICK HERE TO RESET YOUR PASSWORD! Loping or surging at idle…it seems like my truck has a big cam in it. I have noticed once in a while my truck will lope like it has a big cam in it or something.
What causes an engine to surge during a tune up?
Step 2 – An engine’s tune up is a regularly scheduled service, when this service is neglected it can cause the engine to surge. Learn more Step 3 – If a fuel pump or regulator is failing is can cause an unsteady volume or pressure for the fuel system causing the engine to surge. Learn more
Can a vacuum line cause an engine to surge?
Learn more Step 5 – If a vacuum line has caused a leak the engine will surge, as vacuum lines age they can become brittle and fall off the engine or accessory. Learn more Step 6 – If an air intake boot becomes torn and develops a leak it will cause the engine to surge.
Watching the fuel pressure at idle stays around 5200psi and when it surges up goes to around 9000psi. It’s up and down about every 15 seconds. And you can also feel it at a slow speed. Could someone lead the right direction, I do automechanic by trade I just don’t do a lot of diesel work. Thanks for the help fuel pressure regulator.
How often does fuel pressure surge at idle?
Watching the fuel pressure at idle stays around 5200psi and when it surges up goes to around 9000psi. It’s up and down about every 15 seconds. And you can also feel it at a slow speed. Could someone lead the right direction, I do automechanic by trade I just don’t do a lot of diesel work.
Why is my truck loping or surging at idle?
If you have a scantool look at the actual rail pressure and the desired rail pressure when you have the problem. If they stay close together its not a regulator if the Actual is high by more than 500 psi you’ve got a regulator issue. If you have a scantool look at the actual rail pressure and the desired rail pressure when you have the problem.
When does fuel pressure regulator go too high?
If they stay close together its not a regulator if the Actual is high by more than 500 psi you’ve got a regulator issue. Click to expand… Here’s what I found via the Predator. Fuel Pressure regulator- jumped around from 1000 to 1700 …it did not state the desired level.
What happens to the exhaust note at idle?
The exhaust note will change pitch at idle, but there is no change in rpms if you watch the tach. You must log in or register to reply here.
What causes white smoke in a GM 6.6L Duramax engine?
A common issue with the GM 6.6L LB7 Duramax engine is white smoke at idle. Worn and damaged injectors are often the cause however there are other causes and considerations that should be looked at prior to injector replacement. INJECTORS STUCK OPEN OR WITH EXCESSIVELY LEAKING NOZZLES DIANOSIS 1.
Can a failed IAC cause engine stalling at idle?
A problem with the IAC should throw a P0505 code. A failed/problematic IAC can cause engine stalling when off-throttle, and/or excessively high engine rpm, particularly at idle. The IAC, signaled by the ECU, controls the throttle opening at idle.
What causes a Duramax injection pump to fail?
As a result (allegedly), the lack of lubrication in the fuel can cause a premature failure of the injection pump, to a point where it won’t allow the LML Duramax to run. You can be driving down the road and everything seems normal, and when the pump fails, the truck just shuts off.
What happens when a Duramax engine goes down?
Not only does this mean game-over for the engine, but it results in a truck that’s down for weeks (if not months) and a huge chunk of change missing from your wallet. The failure is most common in higher horsepower engines, but can still occur in moderately modified and even stock power plants.
CLICK HERE TO RESET YOUR PASSWORD! Loping or surging at idle…it seems like my truck has a big cam in it. I have noticed once in a while my truck will lope like it has a big cam in it or something.
The exhaust note will change pitch at idle, but there is no change in rpms if you watch the tach. You must log in or register to reply here.
As a result (allegedly), the lack of lubrication in the fuel can cause a premature failure of the injection pump, to a point where it won’t allow the LML Duramax to run. You can be driving down the road and everything seems normal, and when the pump fails, the truck just shuts off.
