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. 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. Common symptoms of stiction occur well before your mechanic runs the diagnostics on your engine. Original Poster. injector where the fuel rail would normally connect. A fuel leak occurs when the diaphragm or seal of the fuel pressure regulator is damaged and fails. 3. 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. Follow. Repair Information for P20cf code. Whitish smoke. Another common symptom is fuel leakage, which not only causes performance problems but also leads to a bad smell. 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. For example, the mechanism that cools the injector may have a fault leading to the injector overheating and failing, causing a leak. 5 years ago | 54 views. I saw raw fuel pouring out my exhaust when I lost #2 fuel injector as stuck open. Exhaust Aftertreatment Fuel Injector A Stuck Open. griffter. 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. Browse more videos. Then plug that wire into a spare spark plug and lay it on the inner fender to see if it sparks. It's gone through 1/4 tank of fuel just from idling a total of about 30 minutes. Report. If stuck closed, it will not fire on that pistion. 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. I notice one side of the engine smells like un-burnt fuel. Rough running engine. Engine misfires and decrease in power, acceleration, and fuel efficiency. A typical fuel injector has two basic parts: the nozzle and the injector body. 1. If a fuel injector is stuck open or close (this has been seen many times on 6.0L Diablo cars) the following will happen. They should open and close, according to demand..and if stuck open, of course it will run "rich". Bad Fuel Injector Symptoms: Ford Taurus. Black Smoke from the Exhaust Pipe . But if the injector is stuck open and just dumping fuel into the cylinder would it even make a difference? I have a 1987 jeep cherokee with the renix 4.0. 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. A diesel technician can perform tests to see if a fuel injector has failed. The other three seem okay. Top 8 Bad Fuel Injector Symptoms. I don't know if this would make any difference, but I notice it has AC injectors when I assume it should have AD. Is there anyway to tell a simple test or do you need special diagnostics tools? That may include but is not limited to vehicles from Mercedes Benz, Sprinter, GMC, Chevrolet, Ford, etc. Hi, 1st post, this is my 2nd mrS but this one has a fuel injection issue. Hydro(fuel) locking cylinder. Filter primer goes soft all the time. Usually a bad or failing fuel injector will produce a few symptoms that can alert the driver of a potential issue. Perhaps #2 failed to where it looks closed and just the fuel pressure is enough to open it. 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. Took the plugs out today, the rear plug is fouled. A fuel injector can go bad mechanically or electrically. Stuck Open Fuel Injector. 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? Playing next. CASE 1: All fuel injectors registered the same resistance values. 02 Chevy 3500 CC Dually LB7/Allison - K&N filter, MBRP 4" downpipe back to 6" black stacks, EDGE Evolution CTS level 3. If you have a stuck open injector, you'll need to change your oil as fuel is definitely in your oil. If you have a stuck open injector you should smell rich diesel smell out the exhaust. Black smoke coming out of the car’s … A problem specific, high concentrate oil additive can remove the stiction and restore it to its original factory performance. 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). When the needle valve is opened, fuel under enormous pressure is sprayed into the combustion chamber. The average lifespan of a diesel fuel injector is around 100,000 miles. Discussion Starter • #1 • Aug 20, 2015. This month we will be concentrating on diagnosing a clogged fuel injector using data from a can tool. 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. Bad injector stuck open gas pours into cylinder non stop. 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. 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. The "Check catalyst" light will come on. 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). Rear injector replaced about 8k ago (took the HD mech 5 hours to figure out the injector was bad, another 3 hrs on the dyno to tune afterward). The most common symptoms of bad fuel injectors are check engine light, misfires, backfires, engine vibrations, fuel smell, and performance problems. The symptoms of bad fuel injectors are going to feel almost the same as a bad fuel pump or fuel filter. Reply Reply Author. Now my question is, how do I tell if the fuel regulator is okay? I hook the whole thing up, apply compressed air to the injector and stick it in a paper cup of soapy water. The fuel injectors help improve fuel efficiency, keep emissions cleaner, and reduce the need for fuel system maintenance work. Now the symptoms are back again- OK acceleration, but misses during steady speed, fuel mileage down, backfires and pops. Stuck open will cause raw fuel to dump into cats causing a rich condition and overheat cats and shut down power. 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. Fuel Injector Leaks; Leaking fuel into your engine system when it is not needed can be caused through a faulty part in the injector. Fuel injector flow rates, atomization and distribution are affected and this can cause all sorts of drive-ability and performance problems. 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. Don't even think about inputs. At idle, the high-pressure oil is around 600 psi. Switch some injectors around and see if you can move the flooding symptom to a different cylinder. Injectors require both systems to perform. Fuel Leakage. So if you don't have power or ground there is no way they would open unless they are stuck open. When the engine is at WOT, the high-pressure oil can reach 3,000 psi. We have found that cyl #3 Is misfiring by using a snap on OBD reader. I am already in the red fixing this truck and do not have much more to spend on it. One of the most common symptoms of a clogged fuel injector is difficulty starting the engine, or the engine not starting at all. … 11:34. Monday 18th August 2008. 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 Also should note the filter, pressure regulator, and injection pump are newer. 215 months. It feels like I might have a dead cylinder. One of the obvious symptoms of a clogged fuel injector is the lighting up of the "Check Engine" light in your dashboard. Injector sticking open - symptoms? You need to do a buzz test, but more importantly a contribution/power balance test. If either of these components gets clogged or damaged, it will compromise the entire performance of the vehicle. What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). 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 … Any ideas? Raising oil level (fuel washing down in the cylinder). 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. 3,500 posts. Fuel leakage is also dangerous and should be taken care of immediately. Here is a more detailed list of the most common symptoms … If the injector is stuck open, you can damage the engine in … Fuel from the tank is routed to the injector and sprayed into the combustion chamber. Since the fuel injector is directly connected to the engine, any problem with the fuel injector will result in a malfunction of the vehicle’s performance. Nellie Hank. Save Share. 23 Posts . A dead injector will cause the engine start and operate when it is cold but not when it is warm. Symptoms. 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 ? Smells like unburned diesel. Stuck Open Fuel Injector. Everyone has been great. For a while it has been hesitating under acceleration with an occasional quiet but noticable backfire while also accelerating. Stuck Closed Fuel Injector … This confirms that the fuel injector your are testing is OK. Thanks to everyone who has come to help. Discussion. This is often counter-intuitive to diesel owners who consider the injector as part of the fuel system, not the oil system. 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. In modern common rail diesel engines, fuel pressures can be over 25,000 psi. Learn what Exhaust Aftertreatment Fuel Injector 'A' Stuck Open means, location and how to repair? One of the most common symptoms of a potential problem with a fuel injector is engine performance issues. 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. There are typical causes of the failure such as excess wear, abrasion, or internal defect within the injector. Can be over 25,000 psi steady speed, fuel pressures can be over psi... Oil additive can remove the stiction and restore it to its original factory performance, backfires and pops difficulty! 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