IDing stuck injector

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IDing stuck injector

Postby Oliver » Tue Oct 08, 2019 10:40 am

Before backing off the pipes to each injector one by one, I was wondering if anyone had tried using an infrared thermometer to see which cylinder is noit firing. I am assuming that this should be done right after starting a cold engine so the heat of combustion doesn't heat up the entire block.
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Re: IDing stuck injector

Postby rick s. » Tue Oct 08, 2019 8:42 pm

you might get a better result by using the ir thermo on the exhaust manifold rather than the block.
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Re: IDing stuck injector

Postby Oliver » Wed Oct 09, 2019 9:10 am

I think the water jacket might diffuse the temp and make it hard to be specific. Interestingly a lot of people have looked but no one has a suggestion. I guess SOP is just to remove them all and send out for pop off tests.
With modern fuel injection systems you can block one injector at a time. Guess I will bite the bullet and remove them all.
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Re: IDing stuck injector

Postby gsholz » Wed Oct 09, 2019 11:05 am

To test, can't you just loosen the fuel line to the injector while running in idle? If there is no change in idle you found the bad injector (or bad cylinder).
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Re: IDing stuck injector

Postby Oliver » Fri Oct 11, 2019 7:56 am

I am going to try that, thanks. FYI, Brian Smith told me to use mechanic's stethoscopes and listen to the fuel pipes where they enter the valve cover.
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Re: IDing stuck injector

Postby Tom Overs » Thu Oct 24, 2019 4:59 am

Hope I'm not too late with this.....
Please be very careful as the fuel is delivered at very high pressure.
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Re: IDing stuck injector

Postby Oliver » Mon Oct 28, 2019 12:19 pm

Thanks for the warning, Tom. No you are not too late. BTW, Brian gave me the same warning which is why he advised the stethascopes.+
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Re: IDing stuck injector

Postby Richard Werner » Mon Oct 28, 2019 12:47 pm

Using a flare nut wrench gives more control and you don't risk messing up the nut.
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