best ways to check injectors

mattl140 · Feb 10, 2015

ways to check injectors i think i got some bad ones i can hear them start to clap sounds like #8 thanks.

bruce · Feb 10, 2015

Buzz test and cct.

mattl140 · Feb 10, 2015

what is a cct and when doing a buzz test do you do it when its cold? because i did a buzz test couple weeks ago when the truck was warm and they all sounded normal thanks.

bruce · Feb 10, 2015

Cylinder contribution test. Buzz test shouldn't matter. All it does is make sure the solenoid is being energized.

Justin@DP-Tuner · Feb 10, 2015

mattl140 said:
what is a cct and when doing a buzz test do you do it when its cold? because i did a buzz test couple weeks ago when the truck was warm and they all sounded normal thanks.

Try doing a buzz test cold. I don't think I have ever seen a buzz test failure when warm (unless the injector is just dead or disconnected). The test may pass, but you want to listen to the sound of each injector and make sure they sound the same. If one is really quite, that is reason for concern.

If you are having a dead miss, you can pull the valve covers off and disconnect one injector at a time while the truck is running. If the engine stumbles and runs worse, that injector was working. If it doesn't change, then you have found a problem.

A temp gun to the exhaust manifold when the engine is running but cold may work too. Just aim it at each individual inlet on the manifold. If one cylinder is significantly colder than others, there is a problem.

ja_cain · Feb 10, 2015

Justin@DP-Tuner said:
Try doing a buzz test cold. I don't think I have ever seen a buzz test failure when warm (unless the injector is just dead or disconnected). The test may pass, but you want to listen to the sound of each injector and make sure they sound the same. If one is really quite, that is reason for concern.

If you are having a dead miss, you can pull the valve covers off and disconnect one injector at a time while the truck is running. If the engine stumbles and runs worse, that injector was working. If it doesn't change, then you have found a problem.

A temp gun to the exhaust manifold when the engine is running but cold may work too. Just aim it at each individual inlet on the manifold. If one cylinder is significantly colder than others, there is a problem.

Sounds like good info there. I've heard that if the poppet valve is very worn the vacuum that is created on the oil side can cause a muted injector sound. This may just be in very extreme cases though. I'm definitely a rookie at this. I'm going to try this next time I have a chance on a cold morning.

mattl140 · Feb 10, 2015

ok thanks justin

Justin@DP-Tuner · Feb 10, 2015

mattl140 said:
ok thanks justin

No prob :thumbsup:

mandkole · Feb 10, 2015

remove the solenoid from the 'clapper' -- see if the armature plate screw is loose on the poppet valve. If it is, get the Nintendo tool and tighten it a little.

mattl140 · Feb 10, 2015

could a leaking up pipe or manifold cause a clapping noise

Jomax · Feb 10, 2015

Check for leaking around the manifold and broken bolts. That will make it have a ticking noise while accelerating.

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mattl140 · Feb 16, 2015

what size injectors would work the best with stock hpop, and a tune and where is the best place to get them thanks

bruce · Feb 16, 2015

Stock ad's, or a 160/30 is the biggest I'd go on stock fuel, oil and air. Performance injection systems is my preferred brand but swamps, unlimited, rosewood, full force all make good products