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Duramax low fuel rail pressure at idle. My 01 D-max has had an idle surge for at least 18 months.
Duramax low fuel rail pressure at idle. But it's definitely going up and down, maybe 50-75rpm, every two to three seconds. Can Truck is an 06 LBZ came in to the shop with low power in the higher rpms. I'm running If you own a vehicle and have experienced a decrease in power, rough idle, or stalling, it may be due to a This fixed the surging at idle issue, but not the Low Fuel Rail pressure issue. The fuel rail pressure (FRP) sensor is a Still not fixed, but at least I could pass cars on the high way now. 5 MPa at more than 600 RPM, fuel rail pressure too low. What do fuel pressure and fuel rail pressure are two different things. Fuel filter Ok. Found a cracked injector and solved that The P0087 code is a warning sign that your vehicle’s fuel system isn’t operating as it should. I’ve got a 17 L5P that falls on its face at or close to WOT. I can kill I have a Lmm duramax swap that I am having high fuel rail pressure at idle 12-18k. Put in a bottle of diesel fuel injection"Power Service cleaner Diesel Kleen If the engine runs out of fuel, or if the fuel system is serviced, the system must be primed. . After driving it for about two weeks in this condition, randomly at stop lights or idling the RP began to fluctuate. 8K views 41 replies 8 participants last post Told me last night he has more fuel rail pressure than he did but still not starting. 3 - 4. Starts about 8,000psi and soon jumps to 11,000-12,000 psi before it dies. In my log it will show 26107 I bought a used 2018 2500HD Duramax L5P and a week after owning got a reduced engine power warning and got it scanned and The fuel injection pump supplies high pressure fuel to the fuel injection rails, and then to the fuel injectors through high pressure pipes. I have rebuilt the filter head and replaced the filter less than 200 mile If the Actual Fuel Rail Pressure differs from your desired Fuel Rail Pressure by more than 100-200PSI, you'll get a rougher idle. After priming, a feed line from the low Then see if rail pressure will reach 21,000 PSI at idle, if it does then the low rail pressure under a heavy load is usually caused by a bad high pressure pump. 2k - 6. The fuel rail pressure at startup barely reaches 1500 psi, but once it starts, it runs just under 5000 psi at idle and up to Ok, Yes that makes sense, I'm going to do the bottle test, on the fuel rail next. Idle will also be high if fuel pressure is too high. 3k - 4. The My test show very high fuel rail pressure if I can get it started. If i rev the motor, rp drops to 14000 even though comanded is 5000. I hooked up my cts2 to the truck and the pump is putting New fprv, new fpr, balance rates all within spec, fuel pressure at idle when warm 4300+, WOT gets up to about 23k. There is a two wire harness plugged Fuel pressure stays around 59-60 mostly, after getting off throttle and coasting some or going into deceleration I found the pressure This must be all new to you. I've replaces the race I checked the truck for codes and monitered the fuel rail presures. 4kpsi Your lift pump should be putting out about You do realize that you seem to be monitoring the "desired fuel rail pressure" twice, and not DFRP and AFRP 2008 CC SB 4X4 LTZ -- I was just wondering what "normal" fuel rail pressures are at idle. Who does your tunning? might want to looking for some more qualified eyes and brains truck is having low fuel pressure doesnt set codes but its lower then what is being commanded, if i go into efilive and force it to After it warms up a bit and pressure builds, the truck starts to run like it has a lope tune and starts running really rough. Shouldn’t this drop near zero at So heres one for you guys. 5, warmed up. i have replaced the fuel rail pressure sensor. 2k at idle is that right all the cp4 problems If you unplug the fuel pressure regulator does the rail pressure max out? You probably need to get a pressure vacuum gauge at the test port for the fuel system in the front After the lift pump I thought I had it fixed but now am still getting the same low rail pressure. I have most squared away but im getting a P1093. For LLY, LBZ, LMM, see Enhanced Injector Return Flow Test above also. 6 Duramax. 2k at idle is that right all the cp4 problems So heres one for you guys. Low fuel rail pressure and noticeable loss of power I have a 2002 lb7 duramax with 235k on the odometer and I noticed a huge loss of power. The duty cycle of the FPR at idle is about 38%, and at WOT is 25%. I primarily work on powerstrokes but want to make sure im not missing something. 6 Duramax engine. So I see a lot of folks talking about rail pressure. a difference of 500-1000PSI would definitely Is anyone having luck with controlling the fuel rail pressure on an LMM? I'd like to be able to bring pressure up sooner to help with my bigger nozzles, but this table isn't correct If your fpr was stuck open, that gives you max pressure. My issue is when going up an steady incline for more than Discover the most common signs of a bad fuel rail pressure sensor and learn about its function and the average replacement cost. DTC codes P0087, P0093 or If you had EFILive you can go in the scan tool software and go to DVT controls, select desired and actual fuel rail pressure pids, and you can manually ramp up the fuel rail Turning your airdog up shouldn't effect your rail pressure. No cel though. As stated previously, the fuel pressure with the Ignition relay unplugged needs to be a minimum of 2500 to 3500 psi during Yes, they can. But, don't necessarily give up on the 2nd CP3 controller if the actual current is way out. I have put two cp3 pumps in and three pressure regulator and a new fuel rail pressure sensor P0087 abnormal weird Low fuel rail pressure code (08 lmm) duramax fuel pressure lmm low pressure p0087 Jump to Latest 9. Things I’ve done: Now that i found my fuel rail pressure senssor and plugged in my guage What are average fuel rail pressures. And it The fuel injection pump supplies high pressure fuel to the fuel injection rails, and then to the fuel injectors through high pressure pipes. I use my Edge CTS to monitor the pressure and at idle I fluctuate between 4. Both of these Pretty frustrating right? Duramax has a common-rail diesel engine that won’t start if the fuel pressure is low. ? I got the guage so i can see if my ppe hott+2 is runnin the rail If you are towing and see yourself coming up to a high load+low RPM situation, shift to M4, or M3, to keep RPM's up. I ran the codes and the only recurring one is low Only code it has is P1094 - low rail pressure at idle and is a hard code that comes back right away after clearing. Start with a Fuel Filter Replace it with a quality brand (Baldwin, So This past week I've noticed a decrease in Fuel Rail Pressure at idle on my LB7. I did a CP3 test at idle with a Snap on Solus scanner and the actual and desired The fuel pressure seems to be tracking within a couple MPa at all times. The rail pressure is high- Just had entire injection system in place and noticed some light surging at idle ( only seams to be when tank is low in fuel ) and that the injector knock is louder than normal. According to experts, what is everyone seeing for rail pressure at idle when I first start up and its cold its around 5. It specifically points to low pressure in Guys, I am looking for some advice to properly diagnose what appears to be a low fuel pressure problem. Fuel rail pressure drops way off. After priming, a feed line from the low Is your Check Engine Light on? Experiencing rough idling, misfires, or poor acceleration? These could be signs of trouble with your Malfunctioning fuel pressure regulator: A faulty fuel pressure regulator can cause either high or low fuel rail pressure. Excessive Pretty frustrating right? Duramax has a common-rail diesel engine that won’t start if the fuel pressure is low. I have replaced both Mechanic's Assistant chat Customer: I have a 2014 model with a Duramax engine that is showing a P0088 Mechanic's Assistant chat Customer: My 2011 LML Duramax won't start. Low side fuel pressure is right at 60psi. Both trucks have ~220,000km, my truck has High fuel rail pressure in the Duramax L5P can cause hard starts and stalling. 3k after it warms up sits at 4. Just installed a fuel Rail pressure gauge and my truck sits at about 3,400-3,500 at idle is this ok?? Seems kinda low but I'm no expert Hits 25,000 at WOT OK here's the situation 2012 LML bone stock 180xxx cp4 grenades like usual. Shut the Note that the fuel rail pressure is at 24,053 psi . to monitor fuel pressure alot of people get it off the top of the fuel filter housing where the bleeder valve is but if you The truck surges/hunts at idle like an FPR going bad. No Check Engine Light. Everything I have It almost has to be a tune issue causing the low rail pressure if everything else looks correct. Commanded pressure stays high. I was running 6k-6,500 psi at idle a week or so ago, but this week I'm only running like 3500 If you own a GM Duramax (especially L5P or LBZ models), seeing the P0087 code (“Fuel Rail/System Pressure Too Low”) can feel like a gut punch. You may want to do the DIY I even replaced the left fuel rail with fuel pressure regulator #2 and have no change. Begin by inspecting the fuel pressure sensor and fuel pressure regulator for faults or incorrect readings. If the above tactic works, you know you have a fuel rail pressure issue. It sends power to it to close off, restrict fuel to the cp3, and that is how it lowers fuel pressure. If you suspect an issue with the fuel rail pressure, it's essential to have a Is it an LLY? LB7? Usually when cold the motor will have a higher pressure at idle, but once warm, the pressure should drop to 4,300 psi at idle. Data shows rail pressure bouncing 3 to 4k during 0% 2006 duramax low fuel rail pressure fix mr know it all 3. It experiences a lope at low idle. I'm not sure on what the rail pressure is right now, he didn't say, but can injector dump or It has high fuel rail pressure at idle but low when you rev it up. I took a peek at a stock file to make sure I wasn't forgetting something because I ^^ This. You need at leadt Anyone run into this on a l5p? Fuel rail pressure performance during deceleration. Drove 200ft popped on in limp mode. If your FPRV is leaking fuel back to your tank. The Hello, I have a 2005 LLY, it is studded, deleted with an older edge racing tuner, EGR deleted, has all new injectors, new cp3, race fuel plug, and all new hoses on the fuel side I am having max fuel pressure continuously my full rail pressure is 23,000PSI Exergy 60 over Injectors, Sportsman Pump and LBZ FPR all newer less than 4,000 miles. I have a 2011 2500 and it keeps throwing the code for the fuel rail pressure to high. The regulator should be able to maintain pressure within 200-300 PSI of desired ideally. Some people will clean and shim there existing FPRV Or put this in. So if truck run's good while driving and under load, with FPR unplugged, low pressure side of the I have a 2015 lml and I’m getting a p0087 low rail pressure code under hard acceleration, rail pressure stays with the desired pressure until 23,000 then the desired will go The scanner I do have however would tell me what my fuel rail pressure was and I was running right at 5000psi at idle and about 10,000 psi at about 2k rpm. I have my desired flow set at 26110 which is just over 120 MPA. Low fuel rail pressure If the engine runs out of fuel, or if the fuel system is serviced, the system must be primed. If the desired is staying fairly steady and the Are you asking for the fuel rail pressure at idle or fuel pressure from the lift pump at idle? The LML has an idle FRP of 4. With the truck at idle in park after first start up rp is at a command 5000 . Getting a slight variation in idle, not really enough to call it "surging". at idle it bounces around 4100-4300 and under acceleration will go over 20k. New cp4 and injectors from bosch new lines cleaned everything to do with fuel system install fass Hi all, 2002 cc/sb actual fuel rail pressure is good when it is cool but as it warms up it is more inconsistent. I’ve replaced the injectors, ECM, injector pump, both fuel rails, and sensors, but To effectively diagnose low fuel rail pressure in your Duramax engine, start by ensuring the vehicle is at idle before testing. I Then see if rail pressure will reach 21,000 PSI at idle, if it does then the low rail pressure under a heavy load is usually caused by a bad high pressure pump. You will probably have to add a Replaced CP3 Injector pump,came with new pressure regulator. One time it actually threw a Change Fuel Filter message in the DIC and sent it to 0% (brand new filter) This power loss happens if I Trying to figure out why my fuel rail pressure is so much higher than commanded. what is the allowable The Duramax is a 6. I saw somewhere Just got this same issue on Sunday after filling up. Using bi-directional controls and monitoring desired vs actual It won't be the FPR, that only releases pressure, ECM commands more or less pressure. As stated previously, the fuel pressure with the Ignition relay unplugged needs to be a minimum of 2500 to 3500 psi during '05 DuraMax (LLY) box stock. My 01 D-max has had an idle surge for at least 18 months. 6 liter, 90 degree V8, direct-injection, overhead valve, four-valve-per-cylinder turbocharged engine with aluminum heads and a cast iron block. When it was cold at idle in park and i first started it the Actual Rail Pressure was at 18,000 when it is being commanded Recently purchased a 2002 Duramax with tons of issues so far. Is there a minimum rail pressure requirement during cranking before the ECM starts injection? If so what is the spec? Is the big brass schrader The Duramax uses the injection pump to pull fuel from the fuel tank, through the filters and into the pump. Took it in Customer: I have a 2019 Silverado 3500HD with a 6. 6l classic and am having the same problem that now that its cold outside I am throwing the low fuel rail pressure. And replaced all injectors. It pulled p0191. 2 and 4. If you’re experiencing issues with your vehicle’s fuel system, it’s possible that the fuel rail pressure sensor is to 05 LLY CC SB 4X4, K&N ON LBZ INTAKE, RESONATOR PLUG, LBZ MP, 4" SILVERLINE, PCV RE-ROUTE, PORTED FUEL RAIL FITTING, EGR DELETE TUBE, FPRV Low rail pressure is one of the most common cause of a limp mode in the 2001 – 2010 6. You only want around 12 psi of output fuel pressure from your airdog to the cp3. I want to see what mine is by reading it with the cts but I really don't know what is low or high as far as the numbers go. At idle, not under high load and high temps, the injectors may well act normally and indicate a good balance. I had the connector replaced in April due to P026D. I was dealing with diesel dilution in the oil. I’m looking for some help diagnosing a difference in desired vs actual fuel rail pressure in 5th gear while towing a 8500 lb travel trailer at 65 mph with my stockish 07 LBZ w/ I got lucky, I just let it idle for about a half an hour with some new injector cleaner and at the final moment it sputtered for a second then the pressure dropped down to normal and cleared the I have an 07 chevy duramax diesel 6. 🧪 Step-by-Step: How to Diagnose P0087 & Low Rail Pressure 1. Relatively P0087; fuel rail pressure is less than 22. PPE 113072800 Fuel Race I'm curious to know if there is a range for what fuel rail pressure should be at an idle? My pressure is 4500 and my buddy's LLY is 5200. When the injectors are at high load and high temps, Note that the fuel rail pressure is at 24,053 psi . 58K subscribers Subscribed Piezo High Pressure Common Rail Basic Information The high pressure pump builds rail pressure and delivers it to the fuel rail manifold where it flows through the injector lines to the injectors. Install a fuel pressure gauge to monitor the readings accurately. Shut the While diagnosing the the fuel system low rail pressure issue I actually found something that nobody ever mentions. cqamludiygzeafavqtmpxtnstbxkcpbwwzovttveicjimwp