#1  
Old 09-10-2023, 10:13 PM
lemans67 lemans67 is offline
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Default 3 bad fuel injectors

FAST EZ EFI2. Port injection on an EFI Torker intake. What are the chances of 3 injectors going bad at the same time? My engine with only about 150 miles on it, started running very rough, backfire on decel, rough idle. Changed plugs, they were loaded up. Thought nbr7 plug wire was the issue. Repaired it. Still had issues. Thought I would check the injector and it reads OL. Checked and 2,3 and 7 read open with the rest reading 16ohms. That is the rating. These are Edelbrock injectors. Anything to do other than change injectors? Bad/ old fuel? Thanks

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67 LeMans convertible. Tyrol blue, M22z autogear, 2.73 8.5, 455, FAST MPI fuel injection. 243/ 251 112. solid roller. SD performance ported 6x heads.
  #2  
Old 09-10-2023, 11:50 PM
JLMounce JLMounce is offline
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Quality of components lately aren't the best. That said, having three injectors fail at the same time in unlikely without a root cause.

what's the fuel system consist of? My first inclination would be junk in the fuel system that clogged injectors.

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  #3  
Old 09-11-2023, 07:48 AM
lemans67 lemans67 is offline
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The fuel system is all relatively new, Tanks Inc fuel tank with a return style system with a filter at the tank. The car did sit for a long time while at a body shop. About 6 months. If it is a contamination issue can I just clean the injectors? Is a fuel system cleaner like Sea foam a good idea? Once an injector test bad is it done?

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67 LeMans convertible. Tyrol blue, M22z autogear, 2.73 8.5, 455, FAST MPI fuel injection. 243/ 251 112. solid roller. SD performance ported 6x heads.
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Old 09-11-2023, 09:17 AM
mgarblik mgarblik is offline
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Not sure how easy it is to swap injectors around. But an easy way to verify is to put the suspect bad injectors in the cylinders that were working fine and see if the problem cylinders move with the injectors. If they do, you have a jackpot of 3 bad injectors. Seems unlikely, but with the crap quality of new auto parts from China, it is possible I guess.

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Old 09-11-2023, 09:56 AM
JLMounce JLMounce is offline
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If you know you've possibly got some bad gas, I'd try to clean the fuel system up first. Try the Lucas Oil fuel system cleaner. I've heard decent things about that. Certainly it would be cheaper than new injectors.

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  #6  
Old 09-11-2023, 10:08 AM
lemans67 lemans67 is offline
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So cleaning can possibly fix the 3 injectors that test bad? So when they test bad they are possibly just stuck?

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67 LeMans convertible. Tyrol blue, M22z autogear, 2.73 8.5, 455, FAST MPI fuel injection. 243/ 251 112. solid roller. SD performance ported 6x heads.
  #7  
Old 09-12-2023, 08:16 AM
lemans67 lemans67 is offline
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Ok. It looks like I am buying new injectors. I will flush the fuel system before I do though. New filter also. Of course I just filled the tank up a few days ago. I talked to FuelInjector Clinic, they said being stuck for some time could cause the electrical side to fail.

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67 LeMans convertible. Tyrol blue, M22z autogear, 2.73 8.5, 455, FAST MPI fuel injection. 243/ 251 112. solid roller. SD performance ported 6x heads.
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