When the starter drives the engine to rotate, use a long-handled screwdriver or stethoscope to listen to whether the fuel injector has a “click, click” working sound. Symptoms Of A Bad ‘Spider’ Fuel Injector Assembly. one of two things #2 injector or wire harness. Bad Fuel Injector Symptoms: Ford F150. Check Engine Light comes on. Here is a more detailed list of the common symptoms of a bad coolant temperature sensor. You now know that the diesel glow plug is a necessity for a diesel engine to function properly. After a close review of the fuel injector wiring harness, I noticed the injector wire bundle was resting on … He pretty much sat on the motor looking for loose harness', leaks, anything out of the ordinary. Damage can occur to fuel injectors at any time, but it is more likely to occur near the end of their lifespan. The wiring harness will have two terminals that the prongs on the injector insert into. Electrical malfunctions can consist of either an open circuit or a coil-to-coil short in the fuel injector harness, a loose or corroded connector to the fuel injector control module (FICM), or a fault in the FICM itself. The fuel pressure regulator is infamous for leaking fuel from its vacuum inlet nipple. I agree with the above I've seen a whole lot of injector and IDM codes in my time, never seen a bad IDM, I know they do go bad, but not very often. I've never had a starting problem, bucking, etc. then you will know it's the injector. beats trying to save a few bucks, and having to pay all the same labor to change another in a few months. Depending on the year of your specific Jeep (1995 and newer), a bad fuel injector may or may not set a specific fuel injector diagnostic trouble code (DTC) like: P0201, P0202, P0203, P0204, P0205, P0206. and counting! Pull the valve covers and check the harness, very common on these trucks for them to become unplugged, or burned up. The most common symptoms of a bad engine coolant temperature sensor are check engine light, poor engine performance, overheating, hard starting condition, and the electric cooling fans won’t start. Benji Jerew/Flickr/CC BY 2.0. 1) Intermittent Idle Speed. Bad conductor contact on the engine or the ECM. A flow test will measure the condition and flow rate of your fuel injectors. Part number F6TZ-9F838-A. ... one of the causes of all three symptoms is a bad fuel injector. I have been experiencing what seems like a dead cylinder (seems to be getting worse like 2 dead cylinders now). A faulty oxygen sensor is another, although somewhat remote, possibility as would be a … In fact, the whole car’s functionality will change because of it. , At the same time of auscultation, the method of unplugging and reconnecting the injector harness plug can be used to identify whether the injector is working. First thing I would suspect would be the under valve cover harness. I had a bad injector when i first bought my truck, the engine would lug or miss a little bit until you hit overdrive and then the whole truck would shake like you wouldnt believe. When the traction control module is going bad or failing, the most common sign is when the traction control system (TCS) warning indicator light is on in the dashboard. There is one ground strap on an intake manifold bolt near the ficm that is part of the harness. Symptoms Of A Bad Fuel Injector. Bad ground inside the valve cover, where all 4 injector grounds are connected together. TEST: Testing The Fuel Injector Resistance. A properly functioning MAF sensor is vital for an engine to run efficiently. Similar symptoms can also be produced by other issues, so a proper diagnosis is recommended to be sure of the issue. You always want to be conscious of the following symptoms, but you should be especially attentive as your engine ages. If the fuel injector is clogged, a technician may have to remove the injectors and perform a flow test. since the top of the engine needs to come off anyhow( valve cover, intake tubes, ect) find a fuel shop that will clean, flow test and leak test all the injectors, and get an overhead done at the same time. Inspect the power side of the circuit for a bad connection along the circuit or a blown, short fuse. 2004, 2005, and 2006 3.5L V6 Chevy Malibu. A technician will use this device to measure amp resistance on the injectors and test the volts on the wiring harness for electrical errors. If you see one that isn't squirting oil you have found a bad injector. The 2 smaller rearward plugs on the ficm are for the injector harness. The previous owner would tow up to 4 horses with it (I estimate to be about 8000 to 9000 lbs). Summary - symptoms of a bad mass air flow sensor. What signs would there be of a computer wiring harness going bad? The third main cause of diesel injector failure in the Ford 6.0l Powerstroke engine is also related to the oil system and is commonly known as “stiction” or latching of the spool valves. Plugged in and ran a few checks, no codes, no injector issues. I've had some issues with a rough idle, and had a loose connector having to be zip tied to the computer because it was loose and causing stalling. Since the idle air control valve is supposed to manage the idle speed of the engine, a bad valve will certainly throw that out of whack. Broken conductor. Chrysler Town ... June 22nd, 2018 - 3 0L Chrysler Symptoms of Bad Fuel Injector How To Test The Fuel Injectors 3 0L Chrysler Disconnect the fuel injectors from their harness connectors' '2003 Chrysler Town And Country Replacement Fuel System While you are there "watch" the injectors squirting oil with the truck running. Diagnosing a clogged injector is not always easy because it acts similar to a bad ignition coil, a broken spark plug wire or a bad spark plug. Strong fuel odor What are some of the symptoms of a failing injector pump? One will be connected to ground and will read 0 volts. Check Engine Light When an injector/injectors go bad and wash out a cylinder, or cylinder,s and do engine damage that is costly. Causes the engine to run, but cut in and out and really roughly throttle. If the test light does not glow, you have found the issue. How to Diagnose and Fix Bad Fuel Injector Symptoms. It doesn't seem to be get better when warmed up either. i'd guess you are going to loose more injectors. 2000 F-350 NVK5, XLT Island Blue 7.3 PSD 3:73LS Reg Cab LB, 151,000 mi. I thought it might be a bad/clogged injector. My first mod will be to replace the transfer pump with FASS. The most common type of failure (related to the ‘Spider’ fuel injector) is usually not the assembly itself going bad, but the fuel pressure regulator going bad. Bad insulation, allowing a short to the ground on that cylinder's wiring. Runs rough cold with white smoke when warm runs a little better until hard accel then it has now power.The only code I can get with the reader I have is a p0261 = #1 fuel injector low voltage.Not sure if its the FICM or bad wiring harness. 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. 1. The symptoms of bad fuel injectors are going to feel almost the same as a bad fuel pump or fuel filter. You can also have a misfire when there’s an issue with the spark plugs, the wires connected to the spark plugs, or the ignition coils.In this post, we will teach you how to diagnose a bad fuel injector, how to determine where the problem is, and how to fix it. ... injector output, etc..we've even seen bad torque converters and flywheels cause enough engine ... WIRING or valve cover gaskets or any other engine harness. Top 5 Bad Fuel Injector Symptoms. Once/if the fuel side of the injector is damaged, the symptoms are usually much more consistent. it cheaper to change the internal harness than an injector. The ECM uses MAP sensor data to run crucial calculations, such as engine load, fuel injector pulse, and spark advance. It sounds as though if the injector pump is going bad, there's a definite sign. Bad solenoid in the injector. In most cases, all you'll see code-wise are … I have a 1996 Jeep Grand Cherokee 4.0L 6cyl. The other should read around 12 volts. or swap #2 with #1 injector and see if it still shows bad. An illuminated Check Engine Light is another symptom of a potential issue with the vehicle’s injector control pressure sensor. the harness could be bad on that injector chech to see if its firing and if it is then the injector is bad. Now connect the fuel injector to the harness connector and plug the test light clip to the positive side of … This MAP sensor is mounted directly to the intake manifold, but others might be connected by a hose. You can verify better running by unplugging the ICP sensor, temporarily, to see if the issue goes away. Fuel Injector Harness 1AERK00302 At 1A Auto Com. A faulty injector wiring harness on the driver's side cylinders of the engine caused the engine to run the way it did in this video. Introduction to the inspection method of the fuel injector. Now that it's zip tied, there's still a rough idle and trying to determine if it is the wiring harness causing the other problems also. if #2 failed thats it! I would say it sounds like a dead cylinder not just an occasional miss. Top 4 Bad Diesel Glow Plug Symptoms. Injector control pressure (ICP) sensor. Location Of The Fuel Injector Harness Connector. 3. In order to avoid that from happening Im looking for ways to know its happening at that time it actually happens. So, if the diesel glow plug were to become damaged or become faulty for some reason, the symptoms would be easy to spot. Check for oil in the ICP connector, if present, ICP is bad or on the way out. The symptoms of a bad mass air flow sensor include a car that is difficult to start, bad fuel economy, a rough idle, lack of power especially when accelerating and sometimes a fuel smell from the exhaust fumes. Diagnosing a clogged injector is not always easy because the symptoms act similar to low compression or an ignition problem, such as a bad ignition coil, a broken spark plug wire, a bad … Really all you have to do to install it is move the hot side cac tube out of the way and the harness will unclip and come out. Dan Cost $65-$167. This is an indication that a serious problem exists and should be addressed as soon as possible. I added Seafoam and have been using other injector cleaners (just in case that was the culprit), but I concluded that it is not a bad injector and in fact is the wiring. The injector pump and transfer pump on my truck are original. What he did find, was a leaky y pipe flex connection/section. 1. Below are the top 5 symptoms of a bad idle air control valve which you will easily notice. On average, diesel fuel injectors last up to 100,000 miles. in other words, to avoid potential engine damage.