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Testing Injector Pulse 

 

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 Post subject: Testing Injector Pulse
Posted: Sun Nov 21, 2010 2:01 pm 
Parts Gopher
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Hey guys,

Just wondering if a multi meter would be able to test injector pulse? Or is it too slow to read it? I have no spark and there fore i want to check injector pulse to confirm in the dizzy before i change it out.

Cheers guys

Jamin
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 Post subject: Re: Testing Injector Pulse
Posted: Sun Nov 21, 2010 2:07 pm 
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Hi,

Digital multimeter will be way too slow... You may see it with an analogue meter... There are proper neon testers for this purpose though...

If you have no spark it will be one of three things...

PIP Module
TFI Module
Coil

I am in the process of making up testers to identify the problem in one step... It simulates the PIP pulse...

If I were you I'd be checking the coil negative with a filament test lamp (not a LED lamp or multimeter) and see if the coil negative is going to ground... If it is, you need a new coil, if not its in the dizzy...

But hard to identify whether its the PIP or TFI, TFI is easily changed I'd trying replacing that first and they are most prone to heat stroke and being fried...

Cheers,
Tim

 

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 Post subject: Re: Testing Injector Pulse
Posted: Sun Nov 21, 2010 2:10 pm 
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you can check for injector pulse with a test light, simply put the test light between the 12v pin and the trigger wire on the injector plug and crank the engine, it will flash each time it pulses..
easy....
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 Post subject: Re: Testing Injector Pulse
Posted: Sun Nov 21, 2010 2:11 pm 
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yeah forgot about test light... And because its cranking its only fairly slow engine speed anyway, makes seeing it easier... Unsure whether it'd would with a LED one but I think it would being slow...

Cheers,
Tim

 

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93 Red ED 5spd Manual Build Thread

Performance: Complete AUII VCT Wiring & Power Train, Pacey Headers, 2.5" Exhaust, Exedy Clutch, DBA Rotors
Visuals: FG XR Wheel, XR Front, 17's, BA 5 Spd Shifter, BA Ghia Window Switches, NL Cluster
Tunes: 8" Pioneer Sub, JBL Speakers, Clarion Double DIN Headunit

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 Post subject: Re: Testing Injector Pulse
Posted: Sun Nov 21, 2010 5:43 pm 
Getting Side Ways
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A cheap multimeter won't help you.
One of mine shows the pules on a graph at the bottom of the screen.

The easy way is to go down to jaycar and buy one 12V LED then you just poke the legs down the back of the injector plug.

 

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 Post subject: Re: Testing Injector Pulse
Posted: Sun Nov 21, 2010 9:38 pm 
Parts Gopher
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Yeah thought of testing it with a LED but didn't have one today ... Also it's not the coil as I have replaced the coil, dizzy cap, rotor, leads n plugs

Cheers Jamin
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 Post subject: Re: Testing Injector Pulse
Posted: Sun Nov 21, 2010 9:52 pm 
Technical Contributor
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With a new one? I'd be guessing the TFI (external module) would be the next most likely culprit...

Cheers,
Tim

 

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Performance: Complete AUII VCT Wiring & Power Train, Pacey Headers, 2.5" Exhaust, Exedy Clutch, DBA Rotors
Visuals: FG XR Wheel, XR Front, 17's, BA 5 Spd Shifter, BA Ghia Window Switches, NL Cluster
Tunes: 8" Pioneer Sub, JBL Speakers, Clarion Double DIN Headunit

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