This confirms that the fuel injector your are testing is OK. Usually a bad or failing fuel injector will produce a few symptoms that can alert the driver of a potential issue. Smells like unburned diesel. Fuel injector flow rates, atomization and distribution are affected and this can cause all sorts of drive-ability and performance problems. If the injector is stuck open, you can damage the engine in … That may include but is not limited to vehicles from Mercedes Benz, Sprinter, GMC, Chevrolet, Ford, etc. Now my question is, how do I tell if the fuel regulator is okay? 11:34. Fuel Injector Leaks; Leaking fuel into your engine system when it is not needed can be caused through a faulty part in the injector. So if you don't have power or ground there is no way they would open unless they are stuck open. 02 Chevy 3500 CC Dually LB7/Allison - K&N filter, MBRP 4" downpipe back to 6" black stacks, EDGE Evolution CTS level 3. For a while it has been hesitating under acceleration with an occasional quiet but noticable backfire while also accelerating. Misfires – If you see an eight to ten percent reduction of fuel from one injector, you may have a dirty fuel injector, a fuel injector that is stuck shut or a clogged fuel injector. A dead injector will cause the engine start and operate when it is cold but not when it is warm. I saw raw fuel pouring out my exhaust when I lost #2 fuel injector as stuck open. CASE 1: All fuel injectors registered the same resistance values. Whitish smoke. It's gone through 1/4 tank of fuel just from idling a total of about 30 minutes. One of the most common symptoms of a potential problem with a fuel injector is engine performance issues. I don't know if this would make any difference, but I notice it has AC injectors when I assume it should have AD. Fuel injectors make a sharp clicking sound when they are functioning properly; so the absence of this sound can indicate a problem with an injector. When the engine is at WOT, the high-pressure oil can reach 3,000 psi. Now the symptoms are back again- OK acceleration, but misses during steady speed, fuel mileage down, backfires and pops. 23 Posts . Bad Fuel Injector Symptoms: Ford Taurus. The "Check catalyst" light will come on. Dealer found a fuel injector was stuck open pouring gas into the cylinder and oil and a bent rod, their recommendation is a new engine. … This is often counter-intuitive to diesel owners who consider the injector as part of the fuel system, not the oil system. Fuel enters the injector through an opening on the side of the injector body, which is delivered by the fuel pump and surrounds the injector through passages in the cylinder head. This month we will be concentrating on diagnosing a clogged fuel injector using data from a can tool. Report. Rough running engine. A fuel leak occurs when the diaphragm or seal of the fuel pressure regulator is damaged and fails. Engine Power Inconsistency – An engine that revs high or low and an RPM gauge that fluctuates can be a result of a dirty fuel injector. Learn what Exhaust Aftertreatment Fuel Injector 'A' Stuck Open means, location and how to repair? Discussion. The symptoms of bad fuel injectors are going to feel almost the same as a bad fuel pump or fuel filter. When the engine cranks with the ignition switch on, if the injector fires, it makes bubbles An injector stuck open will release a continual stream of bubbles. Raising oil level (fuel washing down in the cylinder). Stuck Closed Fuel Injector … Everyone has been great. Having the injector stuck open wouldn't that cause fuel to constantly leak into the cylinder and eat a piston or do some other damage like a hydrolok ? This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). Thanks to everyone who has come to help. A typical fuel injector has two basic parts: the nozzle and the injector body. The fuel injectors help improve fuel efficiency, keep emissions cleaner, and reduce the need for fuel system maintenance work. You need to do a buzz test, but more importantly a contribution/power balance test. But if the injector is stuck open and just dumping fuel into the cylinder would it even make a difference? Fuel Leakage. I am already in the red fixing this truck and do not have much more to spend on it. Fuel leakage is also dangerous and should be taken care of immediately. We have found that cyl #3 Is misfiring by using a snap on OBD reader. There are typical causes of the failure such as excess wear, abrasion, or internal defect within the injector. Perhaps #2 failed to where it looks closed and just the fuel pressure is enough to open it. A problem specific, high concentrate oil additive can remove the stiction and restore it to its original factory performance. Question is, with the injector stuck open, is it causing it to lose rail pressure when cranking so that it can't get the initial start? Follow. The other three seem okay. Top 8 Bad Fuel Injector Symptoms. Fuel injectors control the amount of fuel that reaches the engine to make your car start, and a clogged injector might be stuck open or closed, delivering the incorrect amount of fuel, or even no fuel at all, when you try to start your car. A fuel injector can go bad mechanically or electrically. Injectors require both systems to perform. The most common symptoms of bad fuel injectors are check engine light, misfires, backfires, engine vibrations, fuel smell, and performance problems. FOR SALE 2003 Chevrolet 3500 Big Dually:smoke2: LT.. E/C.. Duramax/Ally, TTS Extreme, Suncoast Level 4, ATS Dual Exaust, Alcoa's and 235's, Nav Radio, Bilstien 5100's, Steering braces, Lift pump Check my garage for more info and … Stuck open will cause raw fuel to dump into cats causing a rich condition and overheat cats and shut down power. It arrives via a nozzle that is opened and closed with a needle valve.The opening and closing of the valve is operated by a solenoid. However, there are typically clear signs that your fuel injector needs to be replaced but if you are unsure, you can take it to your trusted diesel repair shop. If you have a stuck open injector, you'll need to change your oil as fuel is definitely in your oil. Here is a more detailed list of the most common symptoms … Then plug that wire into a spare spark plug and lay it on the inner fender to see if it sparks. One of the obvious symptoms of a clogged fuel injector is the lighting up of the "Check Engine" light in your dashboard. 1. Discussion Starter • #1 • Aug 20, 2015. How To Prevent Fuel Injector Problems; In general, fuel injectors are hard wearing and with a little care can often last the life of the engine. One of the most common symptoms of a clogged fuel injector is difficulty starting the engine, or the engine not starting at all. injector where the fuel rail would normally connect. Engine misfires and decrease in power, acceleration, and fuel efficiency. Filter primer goes soft all the time. Save Share. Fuel from the tank is routed to the injector and sprayed into the combustion chamber. Stuck Open Fuel Injector. Took the plugs out today, the rear plug is fouled. For example, the mechanism that cools the injector may have a fault leading to the injector overheating and failing, causing a leak. Browse more videos. However, sometimes they do go bad, and given below are some of the symptoms of a bad fuel injector: Check Engine Light: ... An injector that is stuck open or partially closed will emit an unburnt fuel odor in the engine compartment. I notice one side of the engine smells like un-burnt fuel. What does that mean? 5 years ago | 54 views. Black smoke coming out of the car’s … At idle, the high-pressure oil is around 600 psi. If either of these components gets clogged or damaged, it will compromise the entire performance of the vehicle. If stuck closed, it will not fire on that pistion. Is there anyway to tell a simple test or do you need special diagnostics tools? Original Poster. Don't even think about inputs. If you have a stuck open injector you should smell rich diesel smell out the exhaust. Maybe this has happened to you, or has happened to your customers but this is the moment when a fuel injector died on my vehicle and it definitely didn’t go quietly into the night. While you may never have a problem with your fuel injectors (especially if you regularly use a fuel injector cleaner), sometimes they get dirty, clogged, or completely fail and need to be replaced.. Below are the most common symptoms of a bad fuel injector and the average cost to replace them (when cracked) or clean them (when clogged). Another common symptom is fuel leakage, which not only causes performance problems but also leads to a bad smell. Nellie Hank. griffter. Also should note the filter, pressure regulator, and injection pump are newer. Hi, 1st post, this is my 2nd mrS but this one has a fuel injection issue. Any ideas? If a fuel injector is stuck open or close (this has been seen many times on 6.0L Diablo cars) the following will happen. The average lifespan of a diesel fuel injector is around 100,000 miles. Fuel injectors are considered to be dirty when the hydrocarbons and additives which all forms part of today’s fuels, together with engine gunk and carbon, cause the injectors to become restricted. I hook the whole thing up, apply compressed air to the injector and stick it in a paper cup of soapy water. 3,500 posts. Reply Reply Author. Repair Information for P20cf code. In modern common rail diesel engines, fuel pressures can be over 25,000 psi. I have a 1987 jeep cherokee with the renix 4.0. Hydro(fuel) locking cylinder. Stuck Open Fuel Injector. Common symptoms of stiction occur well before your mechanic runs the diagnostics on your engine. A diesel technician can perform tests to see if a fuel injector has failed. Black Smoke from the Exhaust Pipe . Here's why: If any one of the fuel injectors were bad, your multimeter would've registered a completely and totally different resistance value (for that fuel injector). 215 months. Bad injector stuck open gas pours into cylinder non stop. Playing next. Switch some injectors around and see if you can move the flooding symptom to a different cylinder. It slowly got worse and worse and now all of a sudden i have a noticable loss in power and the engine kinda shakes at idle and sounds kind of like a subaru. They should open and close, according to demand..and if stuck open, of course it will run "rich". The white smoke could be either oil smoke (burning oil for some reason, rings bad, pcv valve bad, etc) or it could be "water" getting into the engine, which could come from inside the engine, head gasket blown and leaking, or something. Exhaust Aftertreatment Fuel Injector A Stuck Open. Injector sticking open - symptoms? That’s why it’s important to check the fuel pressure at the rail before replacing injectors, otherwise you may end throwing good money after bad. 3. 84 K5 Blazer 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter 96 F350 SC dually zf5, 4x4, 92 Cummins, THD 5x12's, THD fuel pin, THD HVLP with adjustable fuel pressure mod, WM, h1c 60/60/12cm WG wired When the needle valve is opened, fuel under enormous pressure is sprayed into the combustion chamber. 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