test lpg injectors

[pibby]

is there a way of testing, actually i will rephrase that, how do you test with a dmm that an injector is functioning correctly?

here is a link to the injectors i have :

http://www.fach.pl/upload_files/File/karty_kat_en/TAURUS.pdf

i measured the resistance across the injectors on mine and they were reading either 5 or 10 ohm. anyway, both sides were reading the same (2 banks of 4 injectors) for the same injector in its respective position.

by switching individual injectors off using the software i can determine some are having a different effect on the exhaust note ie impart a kind of spluttery sound which is not present on petrol.

again, with a dmm is there a way of checking injector response time? i can see via the lpg software that everyting is running correctly eg injector opening times.

guess i'm heading in the direction of replacing the injectors but want to verify that the current ones are faulty.

and i will thank bee utey in advance. ;)

(btw bee utey can you pm price for injectors - thanks)

[bee utey]

To clean/unstick an injector, take off the inlet hose and flood the rail with some carby/throttle body cleaner, reconnect and run injectors.

To compare actual injector operation, clamp each injector's outlet hose and listen to the engine. Then pull the hose off the injector and listen for gas flow. The software only gives you the pulse time being fed to the injector.

You need an oscilloscope to see the injector opening times, the movement of the plunger affects the current and can be seen in the trace, moderating the current by back-emf. You can get hand-held scopes and USB ones too, try ebay for an oscilloscope.

No idea what injectors like yours would cost, my wholesaler only sells his brand of unit injectors.

[pibby]

bee utey, should have clarified - was meaning the ones you use. well, assuming they would be compatible.

sure aint taking vehicle to installer who put the system on to test injectors so was going to just rely on my unsophisticated conclusions. had the injector banks apart a few times and they are clean so don't believe sticking. i know through testing previously that there is gas flowing through each. with fuel pump not running and shutting down individual lpg injectors using the software there are varied impacts, some minimal to some quite noticeable. so would assume not all cylinders getting appropriate supply of lpg.

however, initial thought was can't justify expense for oscilloscope for one off. but had a look and you're right, quite cheap $60-$80, handheld and with usb connection and sd card storage. so will probably get one as it's a good tool to have - won't use it everyday but good to have on the shelf.

here's an example of one for those interested :

?2Msps sampling rate?AR?M DSO Nano?Pocket Oscilloscopes (eBay item 280602071361 end time 10-Apr-11 04:36:19 AEST) : Industrial (http://cgi.ebay.com.au/2Msps-sampling-rate-AR-M-DSO-Nano-Pocket-Oscilloscopes-/280602071361?pt=AU_B_I_Electrical_Test_Equipment&hash=item41552fd141#ht_3762wt_905)