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Old 08-25-2009, 12:08 PM
Right Touch Right Touch is offline
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how do i test a fuel injector?

my f450 is losing power and I was told by someone who heard the truck that it was a fuel injector gone bad because he heard a puttering sound. I originally thought it may have been an exhaust leak but he said no its def a fuel injector. I saw an article in Popular Mechanics that said I can use a Noid Light to test. Is this easy to do? I think my f150 has the same problem too because its puttering slightly and theres also a weird high pitched sound coming from under the hood mostly audible when I am idling that sounds like its coming from an injector?
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Old 08-25-2009, 05:07 PM
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WhitakerServices WhitakerServices is offline
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simplist way to do it in my opinion is to stick a long screwdriver on the injectors one by one and put your ear on the handle part to use the screwdriver like a stethoscope. Be careful not to get eaten by your engine as this test can only be done with the engine running. If you hear the injectors clicking then they are working electrically however they could still need cleaning. This is a test for a gasoline engine I do not know if it is the same for diesel. You didn't specify your trucks engine.
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Old 08-25-2009, 07:08 PM
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Restrorob Restrorob is offline
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When my boss had trouble with the shop Fords he bought a tester similar to this;





I was able to test/look at the spray pattern (which should spray like a umbrella) and test pop-off pressures.....
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Old 08-25-2009, 07:54 PM
Right Touch Right Touch is offline
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any idea what that is or where to get it?

the 150 is gas and 450 diesel
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Old 08-25-2009, 09:57 PM
digger23 digger23 is offline
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That is a diesel fuel injector tester. The injector is fed diesel fuel under increasing pressure until something either breaks or the injector opens. If and when it opens, the pressure and spray pattern are noted and compared with the specs.

That appears to be a manual machine, requiring the operator to pump the lever, kind of like a jack handle. In fact, it looks just like a modified jack.

I have no idea where you can get one, but I bet Google does.
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Old 08-25-2009, 10:11 PM
ALLPro Landscaping ALLPro Landscaping is offline
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what year is your truck.
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Old 08-25-2009, 10:12 PM
ALLPro Landscaping ALLPro Landscaping is offline
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also is it diesel or gas, if its a diesel, you usually see blue smoke coming out the exhaust
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Old 08-25-2009, 10:15 PM
digger23 digger23 is offline
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On second thought, EBay

However, doesn't your F450 have a common rail injection system? I don't think an injection tester of this variety will work with common rail injectors.
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Old 08-26-2009, 04:04 AM
topsites topsites is offline
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Plug a working one in and see if it fixes the problem.
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  #10  
Old 08-26-2009, 10:18 AM
Right Touch Right Touch is offline
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to be honest i dont know too much about injection systems so i dont know if it is a common rail system. I just know that the 450 has lost power and has a putter sound coming off a stop and someone who knows a bit about engines told me it was a fuel injector. But there is no blue smoke coming out. Thats why I thought it was an exhaust leak.
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