How to diagnose fuel injector problems

Its not easy to diagnose a clogged fuel injector since it can be mistaken for a broken coil or spark plug. Ask an assistant to start or crank the engine if it doesnt start.

Important Tips And Suggestions.

How to diagnose fuel injector problems. Fuel injectors are used in all modern engines and are a vital component in the fuel management system. A bad fuel injector will wreak havoc with how your engine runs and will likely leave you stranded on the side of the road. Up until the 1980s fuel injection was controlled in most engines by a carburettor.

In a bid to reduce exhaust emissions manufacturers were forced to change how fuel. Check for the engine to crank. If it cranks but does not start the likely problem can be narrowed down to the fuel pump wiring circuit or pump relay.

Bad injector relays could also be the cause. Check to see if the fuel pump runs when cranked. If so the problem lies in the injectors themselves.

How to Diagnose for Fuel Injector Problems. Its not easy to diagnose a clogged fuel injector since it can be mistaken for a broken coil or spark plug. Still there are common symptoms that–when taken as a whole–can indicate fuel injector problems.

These include the following. How to Diagnose for Fuel Injector Problems. Its not easy to diagnose a clogged fuel injector since it can be mistaken for a broken coil or spark plug.

Still there are common symptoms thatwhen. You can visually inspect the fuel spray on TBI system injectors. Fuel flow spray is readily accessible making it fast to check for potential problems.

Remove the cover off the air cleaner housing where the air filter lives. Ask an assistant to start or crank the engine if it doesnt start. The fuel pressure is OK- but it still does not start.

If the previous steps in troubleshooting a fuel injection system did not resolve the problem do the following. Check the injector power supply. Consult the manual to locate the electrical connectors that supply power to the injectors.

Fuel odor This goes hand in hand with fuel leakage but when your gasoline fails to burn due to faulty injector or even one which is stuck open the smell of gasoline will be high. Occasionally the problem may be coming from your fuel lines or a damaged sensor urging the ECU to inject extra fuel. Because fuel is leaking from the injector you will perceive fuel odor due either to the leak in the seal or in the injector.

This is occurring because fuel is not burning properly as the injector is malfunctioning. Another thing that could cause fuel smell is a bad sensor or fuel line. Test leaking Fuel Injectors.

Fuel injector leak testing should be done under operating pressure. The average DIY fuel injector cleaning project and most automotive repair shops does not have the proper diagnostic equipment or the ability to test leaking injectors or clean them properly. It is suggested that you have your leaking fuel injector sent to Injector RX for testing and cleaning.

Fuel injector issues can be of two types. A type that can be corrected and a type that requires replacement. Based on what youre experiencing you can easily conclude if its repairable or not.

Here are some common fuel injector problems symptoms you should know before fixing it. Other indicators can include a sudden increase in fuel consumption compared to the usual average - or perhaps the vehicle has failed an emissions test. Diagnosing a faulty or poorly performing fuel injector yourself can be done in a number of ways but it doesnt guarantee that this is the only fault.

One handy way is to start the engine from cold and let it run for a few seconds. With a light study the injector body of each cylinder. Sometimes if the injector body is cracked externally you may be able to notice a small wisp of smoke from the injector.

The wisp of smoke that can sometimes be seen is actually the atomization of fuel being released from the crack. Check each injectors resistance through the electrical connector with a voltmeter. Turn off the engine.

Set your voltmeter to the Ohms Ω setting. This will test the resistance across the connector. Pull the connector off the injectors one at a time and place the red lead on one of the electrical contacts on the injector.

Important Tips And Suggestions. Youll need a fuel pressure gauge to troubleshoot the fuel injector assembly on your GM 43L 50L or 57L pick up van mini-van SUV. Youll be working around fuel gasoline which is extremely flammable.

There is nothing more frustrating than having an issue with an Evinrude engine and knowing that your only option is to take it to a dealer. You know without a doubt the issue is the fuel injector. You replace the component but you need to introduce the trim code to the ECM.

How can I do that correctly so that the engine runs like a top. The Jaltest Marine Diagnostic Tool from Cojali has that. Listen To The Fuel Injectors.

Another helpful diagnostic tool is an engine stethoscope. This tool enables a car owner to listen for any problems with the fuel injectors. By placing the tip of the stethoscope on each injector.

Years ago all an entry-level technician needed to diagnose a fuel problem was a set of noid lights a fuel pressure gauge and maybe a meter. These tools cant be used on direct-injection systems because of higher pressures and changes in the injector location and technology.