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Old 04-27-2007, 12:51 PM
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Default How to clean a TBI injector?

Looks like one of my TBI injectors is not spraying very well. Compared to the other one which spray a nice even mist, the other one seems to have more of a heavy droplet spray.

How do you, or can you, take the injector out to inspect what is causing the bad spray pattern. Itís a new Howell TBI conversion on a rebuilt 258. The TBI did sit for about two years dry before I was able to install it. Searched and could not find any posted write-ups.

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Old 04-27-2007, 01:08 PM
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Use a timing light hooked to the coil wire to see the actual spray cone and droplet configuration.
(Old Mechanics trick)
The stroboscopic effect will make the spray pattern a 'Stop Action' so you can get a good look at it.
If you want to slow the flashes down, connect to one of the spark plug wires...

Cleaning is easy depending on what type of injectors you have.
Some can be removed and manually cleaned.
Others have to be 'Pressure Cleaned' in place with a special solvent.
Still others can't be practically cleaned and have to be replaced...

Howell uses an early type of GM TBI that can be disassembled and serviced.
Personally, I'd take them apart, clean them with a healthy solvent, paying particular attention to deposits around the nose, and reassemble with fresh seals.

Remember, don't use a wire brush or anything that can scratch the injector or the injector body!
Nylon brush and strong solvent will do the trick.
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Last edited by Junk Yard Genius; 04-27-2007 at 06:25 PM.
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Old 04-27-2007, 01:13 PM
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Yes, its working, or running if thats what you mean.

Thanks
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Old 04-27-2007, 04:55 PM
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Nice pictures of disassembly:

WitchHunter Performance - Throttle Body injector removal

They do not work right unless they are properly spraying.

You might be well off to remove both injectors yourself and take them into a specialty shop to have them clean and test them. They have the right tools to clean and test them.
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Old 04-30-2007, 11:11 AM
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Thank you! Thats is perfict.
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