testing leaky fuel injectors



testing leaky fuel injectors

Postby grumpyvette » July 22nd, 2012, 11:20 am

http://www.ehow.com/how_7842088_test-le ... ector.html

http://www.ehow.com/how_7760596_check-l ... ector.html

http://www.youfixcars.com/testing-fuel-injectors.html

http://www.fierosails.com/InjectorTester.html

viewtopic.php?f=55&t=1378&p=3035#p3035

How to Test a Leaking Fuel Injector
By Guide Fisher, eHow Contributor
How to Test a Leaking Fuel Injector thumbnail
Leaking fuel injectors can prevent the engine from operating properly.

Fuel injectors can develop leaks either from trapped dirt at the tip, or an internal electrical short that will prevent the value from operating properly. This can cause the engine to run excessively rich from receiving too much fuel, or prevent the vehicle from starting by causing the engine to flood. A simple air pressure test can be performed to determine if the injectors are leaking. As air molecules are smaller than fuel molecules, if the injector passes an air pressure test, it is unlikely to be leaking fuel.

Instructions

1

Attach the sections of copper tubing to the pressure value with the flare fittings.
2

Insert the Schrader valve into one end of the 4-foot length of PVC tubing and secure with a mini hose clamp. Attach the second end of the tubing to one of the copper tubing ends and clamp in place.

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3

Slide one end of the fuel line over the free end of the copper tubing attached to the pressure value and clamp in place. Attach the second end of the fuel line to the fuel injector and clamp.
4

Attach the pump to the Schrader valve and fill the system with 40 to 60 psi of air pressure.
5

Spray the injector tip with the soapy water solution. If bubbles occur the injecting in leaking. If bubbles do not occur wait 10 minutes to see if the pressure gauge reading decreases, indicating a leak in the test system. Check all fitting with the soapy water solution to find the leak. Tighten, re-pressurize the system and reapply the solution to the injector.
6

Remove the injector from the test assembly and clean with fuel injector cleaner and a small brush. Retest. If it still shows signs of leaking the injector should be replaced.
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Re: testing leaky fuel injectors

Postby grumpyvette » July 22nd, 2013, 6:47 pm

leefybeaver wrote: Grumpy, ??I ordered a set of injectors for my 88 from the local parts store. When they showed up I had 5 that had black plastic/rubber coating on the top and 3 that had a grey green cover on them. They were also a different length from end to end. So I'm obviously not going to use a miss-match set of new parts. Anyway, is there a flow difference between the injectors of different length? I just want to make sure I get the right ones. They did have the same part # on all the box so now I'm super skeptical.

I can post a pic later if it will help.

Thanks


while the older injectors do tend to function with e85 fuel they are usually not truely compatible with ethanol and the o-rings may swell or slowly fail on the earlier c4 corvettes, it was not until the LS series engines were put into cars that true E85 compatible injectors and fuel line components were factory installed (1997) at the earliest.
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it sounds like someone returned their old injectors in new boxes and they got re-stocked to me... yes theres several manufacturers, and most likely you can get a set that doesn,t look identical to the old injectors to fit, but I would at least start with a matched set from the same manufacture

THESE LINKS MIGHT HELP

viewtopic.php?f=55&t=1200&p=31258&hilit=calculate+injector#p31258
IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!
grumpyvette

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Site Admin
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Posts: 14105
Joined: September 14th, 2008, 1:40 pm
Location: florida


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