Diesel injectors covered in oil The pool maybe 1-3mm deep. Engine Stumbles, Misfires, and Rough Idling When Learn how to clean diesel injectors - 3 proven methods to restore power and fuel efficiency. Read on to find out the signs and how to address the issue. This points to engine oil leakage as a significant factor in the formation of internal diesel injector deposits (IDIDs). First, your engine may run rough or misfire. Most often, the problem is that the Fuel/ Oil on fuel injectorsAll times are GMT -5. 2. 0 heads will hold a small amount oil around the top of the glow plug. He ordered new oil, injectors, coils & plugs before he called me & needs me to replace which I'm now doing. I have an oil leak coming from the injectors - from two of the injectors, one worse than the other. May 7, 2013 · Sure sounds like the return line on an or multiple injector/s is leaking and causing high crankcase pressure forcing the oil out wherever it can. Jun 3, 2008 · Cracked injector bodies can leak fuel under the valve covers under pressure, which drains back to the oil pan. 0L Power Stroke Diesel - Leaking injectors despite new seals - I have replaced all the injector seals as well as the ball cup seals but when I crank the truck over after a few cranks I see oil bubbling up from the top of all the injectors. May 5, 2011 · I just changed my glow plugs, and before doing so I noticed alot of oil accumulation around the two closest to the driver side. Standardized tests have been developed to quantify the tendency of a fuel and fuel injector combination to be affected Mar 16, 2015 · Hello, 2002 7. Accidentally putting fuel injector cleaner in oil is a mistake where the cleaner, designed to break down carbon deposits in the Could your engine be suffering with injector blow-by or black death? Read our blog to learn more about this issue and how to diagnose it. Upon removal I saw that all injectors but cylinder 7 were covered in Jul 3, 2023 · In short, fuel injectors may leak into cylinders because they are clogged or broken, you should repair this problem as soon as you identify it because this can lead to engine damage. . Other than the oil, everything else is very clean and pristine Why is diesel fuel in oil? To answer that question, we need to know what are the main cause that of this issue. You could fire it up with the valve covers off and see where it is leaking from. In the picture, you can see that one of the injectors is covered in something, and the one behind it is clean. If the truck runs or idles rough you could have a bad cylinder so do a compression test to see what comes up. 3 F350 diesel. What do you think the problem is and should I wait on installing the new ones. ) FYI if the cylinder was not firing I believe you would have no carbon, just diesel or diesel and oil. Feb 28, 2019 · Danny, That looks like your injector did not seal like it should. However, more complex problems may call for the Dec 27, 2016 · Okay guys I really need some help number 7,3,8,6,2 and maybe number 4 injectors all seem to have this oily looking residue mixed with sand (dust from it being wet I assume) or dirt rather. However, there are specific tests for that, including testing for water/rust, or accidental contamination with DEF, etc. To each their own, I may be a bit more risk averse than others. So history: 1. My question is it is possible to have fuel in the oil from a connector tube not fully seated in the injector or is it only possible for Nov 26, 2015 · Hi guys, while changing oil on my 220cdi CLA i noticed i had small amount of oil or maybe diesel around all 4 injector cavities, at first i was thinking its leaky injectors but then noticed that the cavities are not joined, so is it possible that all 4 injectors are leaking? Or i have an oil Understanding the common causes of diesel fuel injector failure, recognizing the symptoms, and knowing how to diagnose these issues is crucial in maintaining your engine's performance and longevity. The valve cover (which is plastic) will be baked brittle, along with the gasket and the integral injector body. Jul 29, 2017 · My '03 LB7 with mid-240k miles began "making" oil recently. Nov 9, 2013 · Was wondering if anyone would know why or from where would oil sep into the injector cups. If left unchecked, these deposits build up inside injectors, restricting fuel flow and disrupting the spray pattern. Fuel supply checks, visual checks, resistance tests, spray pattern analysis, and ECU diagnostics provide important insights into injector performance. He told me I had two bad injectors, one per side, and it would be $3k to replace those two, or $5k to replace all eight. That's a very expensive problem. Couple of questions: 1 Are you experiencing problems with your HEIU injectors for your Ford 6. Had bad injectors and replaced them and also new high pressure lines. Jan 13, 2015 · search the internet for hpfp failure. Your GP has carbon and other indicators of ignition. And notice it’s streaming down the back left of the engine. I've been dealing with diagnosing and changing my injectors lately. A few key symptoms will let you know if you have a bad diesel injector. I pulled connector tubes and #1 cyl connector tube appears to have not been properly seated. Internal diesel injector deposits are a build-up of carbon and other contaminants inside the fuel injectors of a diesel engine. I took it to a reputable (seriously) local dealer anticipating the dreaded "injector" diagnosis. reassembled and after 160 miles lots of fuel in oil 3. Dec 27, 2024 · When a diesel engine won’t start, one of the important parts of diagnosing would involve the injector. For this reason, diesel fuel will be present oil. I've read all the post and injector replacement appears simple enough. The leaking oil may cause engine misfiring, poor gas mileage, low power, and engine codes triggering the check engine light. I dont thing it would be cause not all the injectors had oil on them. He ordered new oil, injectors, coils & plugs before he called. This article provides a comprehensive guide to understanding and managing diesel fuel injector problems. These signs can tell you what's happening inside your Diesel Fuel Injector. Failing injector nozzle Often failing injector nozzles are the most common cause why diesel engine gets into the oil. Detecting issues early and diagnosing them correctly can help prevent costly repairs and extend the lifespan of the engine. The careful following of all these steps can help the users identify injector problems. My truck hasn't run for a few weeks I did try to run a compression test (harbor Freight tool fail) so I went on to remove the injectors. There's a pool of oil or diesel (think it's oil?) Around each injector and it's all on the underneath of the engine cover underneath air box. The truck has a tick that's been gradually and I do mean very subtly getting louder it's not loud or Mar 6, 2011 · replaced injectors over new years weekend and truck is running well, but im seeing fuel in my oil again, injector balance rates are showing fine which lead me to believe it was a loose fuel line to the injector or a return line not sealing, checked out fuel rail pressure against desired rail Jun 14, 2020 · After lifting the engine cover I noticed that oil had been pooling in the injector wells for injector 1 and 2. Injector Covered In Oil. Any ideas. Expert tips from A1 Diesel for better engine performance. Factors that affect injector deposits include properties and chemical composition of the fuel, local fuel temperature, and injector geometry. If it was caused by fuel contamination, then ford is correct in not warranting the repair. Feb 13, 2015 · Hey guys, I've searched the forum and haven't found an answer. The galley between the two heads/valve-covers is caked with 1/2" of oil and soot and dirt and grease. May 17, 2024 · Quick Overview Diesel combustion produces carbon deposits that can accumulate in the fuel system, including the fuel tank, fuel lines, and injectors. Nov 2, 2010 · The 6. But with Jul 3, 2024 · In this blog post, we will explore what internal diesel injector deposits are, what causes them, and how they can be prevented. Tore back apart and reassembled to run without valve covers 4. (Or that would not have happened leaky injector or not. Also van struggling to start Apr 27, 2023 · What is turbo runaway? VW Beetle TDI | Volkswagen While ‘black death’ isn’t the only reason for a diesel runaway, it can directly contribute to the problem. Feb 17, 2014 · SOME 6. I’m assuming Valve Cover gasket? Sep 9, 2017 · Chevrolet Diesel Engine/Components Cylinder block and heads and all internal parts, intake and exhaust manifolds, timing gears, timing gear chain or belt and cover, flywheel, harmonic balancer, valve covers, oil pan, oil pump, water pump, fuel pump, engine mounts, seals, and gaskets. But there's a puddle of oil of floor under van and I've traced it back up to the injectors. This is normal. Nov 23, 2023 · When I get out I see the back of my truck completely covered in oil! I thought I had a bad injector now thinking maybe that and turbo? Any help from someone with more knowledge than me is appreciated. You don't need to try and clean the glow plugs with cleaner, just wipe them off and put them back in. Anyone run across this issue before, or know what’s Feb 7, 2025 · Hi recently had injector copper Washers changed. Apr 19, 2016 · Decided to remove the plastic injector cover today and take another look. Technically speaking, diesel engines don’t need fuel from the injectors to run. Aug 10, 2016 · Customer called saying he somehow put diesel in his 550I N63. No crusty black death, but there is a small pool of oil surrounding all of them (maybe 4 out of 5). You may also notice a loss in power, increased fuel consumption, or black smoke from the exhaust. 2002 Duromax LB7, MPG dropped from 18 to 10, Oil pressure dropped = major fuel in crankcase. And by the way the amount of oil is very minute and not enough that you have to worry about it hydro-locking Feb 1, 2025 · The test successfully replicates the characteristics of real-world deposits, with findings suggesting that calcium sulfate deposits primarily form in the presence of engine oil contaminants. Nov 21, 2016 · 6. Over time, the nozzle seal may wear out and the tightness will be weakened. 0L and 7. The time now is 09:48 PM. These contaminants can react with the fuel or clog the fuel filter, leading to blackening of the oil. Feb 22, 2022 · I’ve recently spotted oil around the first 3 injectors from left to right. When you removed the glow plug it runs down into the cylinder there by coating the glow plug. I cleaned everything off and figured it was just accumulation from over the years. Learning to decode these messages helps you catch problems before they become expensive disasters. I removed all of the injectors and i am looking for a seal that is missing that nay be causing the leak but cannot Dec 28, 2013 · First time diesel owner. Can anyone shine a light on what this may be caused by or had experience with this? Apr 23, 2016 · I am getting a lot of fuel in my oil after an injector change. What is the most common oil leak on the top of the 7. This article will discuss the symptoms of bad diesel injectors and how to diagnose and clean them if necessary. Some things are best left to someone else's risk. ) Oct 5, 2025 · The Telltale Signs: Primary Common Rail Diesel Injector Failure Symptoms Your truck communicates problems through performance issues, strange sounds, and visual warnings. A failing fuel pump can cause fuel starvation, leading to excessive carbon build-up and black diesel oil. When looking at the injectors from the top side all looks well but when I use Sep 16, 2020 · Hi everyone, recently took a look under the engine cover and noticed that one of the injectors is accumulating something around it. I have an oil leak. Several factors, such as driving short distances, failing fuel injectors, and engine mods, can cause diesel in oil. After adding fuel Aug 4, 2025 · Learn how to replace diesel injectors safely & save money! Our guide covers diagnosis, tools, step-by-step removal, installation, and expert tips. 3? I suspect valve cover gaskets, and maybe the intake manifolds to Apr 19, 2020 · I have a 2007 CRDI Titan Sportage Diesel since new and currently on 180k miles. This looks like something I won't be able to afford! If your diesel isn't performing like it used to or your MPG has mysteriously dropped, chances are your fuel injectors are gummed up with carbon, varnish, and other nasty deposits. I'd change injectors in a gas engine without a care but diesel blocks are iron and the expansion difference compared to aluminum is extremely different. Doesn't smell like diesel. The high pressure fuel pump self destructs sending the metal shavings through the entire fuel system. 7L DIESEL EQUIPPED VEHICLES MAY EXHIBIT AN OIL LEAK FROM THE TOP OF THE LEFT SIDE OF THE ENGINE THAT MAY COLLECT IN AND AROUND THE FUEL INJECTORS OR ALONG THE VALVE COVER. A bad injector pattern or leaking fuel into the cylinder outside the power stroke can allow fuel into the oil pan around the piston (as well as washing down the cylinder wall and reducing lubrication of the piston and ring against the cylinder. Sep 16, 2011 · i am in the process of changing injectors in a 95 dodge and when I pulled the injectors out the tips of the injectors were covered in motor oil, is this normal. 3L Powerstroke engines? Learn about the symptoms and solutions here. Fuel contamination can be covered on your Diesel injectors play a crucial role in engine performance by precisely delivering fuel into the combustion chamber. Pulled oil fill and no leak out of the CP3 so I have to assume injector problem. Oil thinned by diesel fuel can seep past the turbo seals and into the combustion chamber. When injectors malfunction, they can lead to poor fuel efficiency, loss of power, or even engine failure. Abstract: Diesel fuel injector fouling involves deposit formation on the external and/or internal surfaces of the injector and nozzle. I need to fix this. gx 9noxj 39ht yz fmbsso my2c mdhcn vmn b4zfnn xazfpux