Testing EFI injectors

Joshua Van Tol josh at spiny.com
Tue Dec 16 13:08:49 EST 2003

Use a stethoscope to listen to the injectors. Then you'll know if 
they're opening or not.
On Dec 16, 2003, at 6:22 AM, Vic Norman wrote:

> I'm working on a Bosch L-Jetronic (EFI) equipped car that has been 
> sitting
> unused for a couple of years. Initial no-start diagnosis was no fuel
> pressure. Cleaned out the gas tank and replaced the fuel pump and 
> filter.
> Now I have good fuel pressure. When I crank the engine it fires for a 
> few
> seconds and then dies - presumably the cold start valve doing its 
> thing. The
> obvious diagnosis is that the injectors are gummed up but how do I test
> them? By the time I have got the injectors out of the car I have 
> pretty much
> torn the intake system to pieces so I can't simply crank the engine 
> and look
> at the injector output. I hate to spend several hundred dollars on new
> injectors and then find out that they weren't the problem. Is it 
> possible to
> dunk the injectors in carb cleaner or some such to clean them?
> Also -  is it possible to monitor the signal to the injectors with a 
> basic
> voltmeter (I don't have an oscilloscope) and if so, what sort of values
> would I expect to see?
> Thanks
> Vic Norman  1996 A4 2.8 1989 Alfa Spuder Veloce
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