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User manual for otc 3396 fuel injector tester

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5.0L won't start without a shot of starter fluid

There are several ways to test the injectors. A test light called a "noid" tester connects to the electric injector plug and will light up with each signal to fire or a multi-tester set to DC voltage. Some parts chains loan tools and may have a "noid" tester.

Sometimes a crankshaft position sensor will malfunction at low rpm and work once the engine turns over well. That sensor regulates the fuel pressure for the RPM so it may be that the sensor is failing to release enough fuel at low RPM.

Sep 06, 2017 | Lincoln Cars & Trucks

1 Answer

3400 liter engine. What should the own readings be on a fuel injector?

Should be right around 12 ohms.

the beauty of testing injectors is that you dont need to know the spec. All of the injectors should be about the same. If one or more reads lower (typically read lower) than you found a bad one.

The injectors on this engine are prone to sticking so an ohm check may reveal normal readings but the injector can still not be working. There are two things you can do.
1. use a long screwdriver to touch the injector with the engine running and place your ear on the handle. you should hear a distinct clicking noise. If you find one that is not making noise try lightly tapping on it with the srewdriver. You may find that it will start working and the engine idle will smooth out.
2. you can pick up an injector tester made by OTC tools fairly cheap. You can then use a fuel pressure gauge to see if the injector is working compared to the other injectors. Sometimes this can also be done with a high end scan tool as well.

Dec 17, 2015 | 2001 Chevrolet Impala

1 Answer

My 1994 Cadillac Seville is running excessively rich.

I guess my first question would be, is the check engine light on ?
If the fuel system is too rich the O2 sensors should be reporting that to the computer. There could be a trouble code that would point you in the direction of the problem.
Otherwise, it could be a weak injector, or a wiring problem that is keeping one or more injectors grounded.
Are all of the spark plugs fuel fouled ?
No problems with the air filter and intake ?

Apr 16, 2013 | Cadillac Cars & Trucks

1 Answer

The engine cranks but will not start

Hi there:
You will have to pinpoint what the engine is missing...
- Spark
- Fuel
- Compression

All three of these are tested when the engine is being cranked over. There are two way of checking for fuel. Fuel pressure and fuel trigger. Both are very important and must be present for the engine to start. Fuel pressure is self explanatory. You just hook up the gage and see what the reading is. Fuel trigger is check with a noid light. The injector gets unplugged and the noid light gets plugged in to the injector clip. With the engine cranking over, this light must blink. This is the signal to the injectors from the computer. You can have all the fuel pressure in the world, but it wont matter if the injector is not pulsing gas into the cylinder like it should.

Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition. Be extremely careful when doing these tests.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Apr 20, 2012 | 2005 Kia Sorento

2 Answers

Misfire on number 7 cylinder


Jun 16, 2011 | 2001 Chevrolet Express

1 Answer

I have a 2001 Explorer Sport Trak and it don't want to start. We have checked all the sensors (crankshaft, cam trigger, fuel pump pressre is 65). What is the tank fuel pressure sensor voltage reading. ...

The first thing to check would be spark. This can be done by connecting a spark plug tester to a plug wire while the engine is cranking. The tester must be grounded to the engine block for a good electrical connection.. Your fuel pump pressure is OK.
The problem should be electrical so check
1. No voltage to the fuel injectors (blown injector fuse or bad relay)
2. No pulse signal to the injectors from the PCM (no crank or cam sensor input to the PCM, or a bad driver circuit in the PCM, or a wiring harness problem)
3. A shorted fuel injector (robs voltage from the other injectors so none will operate)

Jan 08, 2011 | 2001 Ford Explorer Sport Trac

1 Answer

I need to know the firing order of the coil packs. I have replaced spark plugs and wires and coil pack but there is still a miss. Put a new crank shaft censor in it as well

Do you have a code for a misfire?

If a crank sensor goes bad the vehicle will typically not start at all.

If you have spark to all the cylinders than the next step is to either check compression or check the injectors. Usually the injectors will stick when this happens they will ohm out fine but will not spray fuel. To check them you will need either a high end scan tool or and injector tester and an fuel pressure gauge. The tester is connected to the injectors one at a time using the bulk connector near the alternator. The injector is then triggered by the tester as you watch for a drop in fuel pressure. Whichever injector does not drop fuel pressure when triggered is the bad injector.


Nov 22, 2010 | 2002 Buick Rendezvous

1 Answer

My truck has a #4 cylinder misfire according to the OBDII I've tried running injector cleaner, replaced the plugs, wires, and coil. To no avail and suggestions?

Try to check that the fuel injector, using a fuel injector tester, is getting an electrical pulse as indicated by the tester lighting up and blinking periodically.

Also, one can check the injector by putting a stethoscope on the injector and listening for a loud click.

Also, check that antifreeze is not leaking into the cylinder causing the plugs not to fire. How did the plug look that was replaced? It should have had a light brown dry appearance if normal.

Oct 07, 2010 | 1997 GMC Sierra

1 Answer

Injector problem 4 litre eng.

hook up to computer (snapon,otc,ect.)need more data to diagonois properly don,t think needed injectors at all head gaskets, map sensor commen on this vech.6184512886 bigjim.

Nov 30, 2008 | 1995 Oldsmobile Aurora

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