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Home made Fuel Injector tester by Toddster
Started on: 01-08-2021 05:23 PM
Replies: 6 (128 views)
Last post by: fieroguru on 01-09-2021 08:43 PM
Toddster
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Report this Post01-08-2021 05:23 PM Click Here to See the Profile for ToddsterClick Here to Email ToddsterSend a Private Message to ToddsterEdit/Delete MessageReply w/QuoteDirect Link to This Post
The easy solution to a leaking fuel injector is buy a whole new set, but if you don't want to part with $400 when you have plenty of spares, meet.......

The Frankinjector!



A regular in-tank fuel pump inside a gas can filled with parts cleaning fluid, the red switch turns on the pump, the yellow fired the injector. Change the lead to test each injector individually.

The two bolts are positive and negative terminal posts for 12V power and the fuel rail is a spare I had laying around.

[This message has been edited by Toddster (edited 01-08-2021).]

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pmbrunelle
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Report this Post01-08-2021 06:30 PM Click Here to See the Profile for pmbrunelleClick Here to Email pmbrunelleSend a Private Message to pmbrunelleEdit/Delete MessageReply w/QuoteDirect Link to This Post
Spare Fiero parts come in handy...

I would be wary of a typical switch; an electrical arc is created when the switch is opened or closed. This could ignite hydrocarbon vapours.

I suggest some sort of solid-state or explosion-proof switch.

If not, simply extending the wires and moving the switch physically away from the vapour cloud could add some safety to this setup.
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Dennis LaGrua
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Report this Post01-08-2021 07:02 PM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
For off car fuel injector testing, I use a fuel injector cleaning jig sold on eBay for about $10. I test them singly using a battery charger as a power source and a can of carburetor cleaner to clean and test the flow. Have had good results with it. For injectors on the engine fuel rail I use the pressurized cleaning kit that attaches and feeds solvent to the fuel rail.

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[This message has been edited by Dennis LaGrua (edited 01-08-2021).]

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Notorio
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Report this Post01-08-2021 08:05 PM Click Here to See the Profile for NotorioSend a Private Message to NotorioEdit/Delete MessageReply w/QuoteDirect Link to This Post
That's a nice rig you set up Toddster. With that, or even the ebay kits, how can one be sure that an injector that opens fine with a continuous-on, 12 volt signal, will be fine under running conditions where it is only open for milliseconds at a time? It seems like how well-rapidly-repeatably it opens and closes would be very important. (Actually, I don't know how long they are open.)
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pmbrunelle
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Report this Post01-08-2021 09:03 PM Click Here to See the Profile for pmbrunelleClick Here to Email pmbrunelleSend a Private Message to pmbrunelleEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Notorio:

That's a nice rig you set up Toddster. With that, or even the ebay kits, how can one be sure that an injector that opens fine with a continuous-on, 12 volt signal, will be fine under running conditions where it is only open for milliseconds at a time? It seems like how well-rapidly-repeatably it opens and closes would be very important. (Actually, I don't know how long they are open.)


You could use an extension harness to fire the injector with the car's ECM and electrical system. Take out the distributor (or use a spare one), turn the key to run, and spin the distributor. This should make the injectors fire as if the engine were running.

********************************************************************************

Injector pulse width can be in the range of 1 to 10 ms for typical batch fire.

********************************************************************************

Another idea:

With a computer such as MegaSquirt, you have a test mode to try injectors with different pulse widths. Can be used for a complete test involving the car's fuel and electrical systems.
http://www.msextra.com/doc/...e_Reference-3.4.html

See Section 15.8.

You could also get one of these boxes and use it for a standalone fuel injector tester.

[This message has been edited by pmbrunelle (edited 01-08-2021).]

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Notorio
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Report this Post01-09-2021 08:01 PM Click Here to See the Profile for NotorioSend a Private Message to NotorioEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by pmbrunelle:

You could use an extension harness to fire the injector with the car's ECM and electrical system. Take out the distributor (or use a spare one), turn the key to run, and spin the distributor. This should make the injectors fire as if the engine were running.

********************************************************************************

Injector pulse width can be in the range of 1 to 10 ms for typical batch fire ...

********************************************************************************


What a great idea for an experiment!

Here is an article I found that has some nice pictures in it of what 'good' and 'bad' spray patterns look like ... Fuel Injectors – Will Usually Only Fail In One Of Three Ways

Are you guys with your rigs able to see differences like this? Perhaps before and after cleaning? This is an intriguing area to me. It would be really cool to see the difference in spray pattern, if any, between a New injector and a high mileage one that has been cleaned.
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fieroguru
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Report this Post01-09-2021 08:43 PM Click Here to See the Profile for fieroguruSend a Private Message to fieroguruEdit/Delete MessageReply w/QuoteDirect Link to This Post
Mine is a 4 cyl fuel rail from ebay, harness with 9v battery, micro push button to fire the injectors, and compressed air is used for pressure. With the quick connects, I can hook the rail to a tube filled with injector cleaner, and run it through the injectors. Main thing I look for is consistent spray pattern between the 4.

[This message has been edited by fieroguru (edited 01-09-2021).]

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