L-Jet Injectors Aren't Getting Ground, L-Jet Injectors Options

[nmkimosabe]

After a thorough investigation, it appears that the injectors are not getting ground to fire properly on my 1974 1.8L. Maybe it's an air flow sensor issue but not sure. All the other wiring seems to be okay. I would appreciate any thoughts from the knowledgeable folks on this forum. Thank you.

[Rob-O]

I’m with Superhawk. Make a plan and methodically test. Car needs air, fuel, spark. Follow one of those three things through the process to its ingestion into the engine and test along the way. You say it’s getting fuel. That’s a start. But is it keeping fuel pressure? Attach a gauge to one of the fuel lines and turn it over. Observe the gauge. What’s the pressure? What is the pressure after 2 minutes? 5 minutes? 10 minutes? All still good? Pull an injector and turn it over. Are the injectors firing? Is it a nice spray pattern? Then air, then spark. Above Jeff linked some great resources for learning L-Jet and testing the components. If you can use a volt meter you can diagnose this yourself. If you can’t, give yourself some credit because you can learn all of this. As mentioned above L-Jet was used on thousands of vehicles from a bunch of manufacturers so there is a wealth of knowledge on the internet. Even more precise info for our particular version of L-Jet on this website.

So first question, do you know how to use a voltmeter?

[nmkimosabe]

I’m with Superhawk. Make a plan and methodically test. Car needs air, fuel, spark. Follow one of those three things through the process to its ingestion into the engine and test along the way. You say it’s getting fuel. That’s a start. But is it keeping fuel pressure? Attach a gauge to one of the fuel lines and turn it over. Observe the gauge. What’s the pressure? What is the pressure after 2 minutes? 5 minutes? 10 minutes? All still good? Pull an injector and turn it over. Are the injectors firing? Is it a nice spray pattern? Then air, then spark. Above Jeff linked some great resources for learning L-Jet and testing the components. If you can use a volt meter you can diagnose this yourself. If you can’t, give yourself some credit because you can learn all of this. As mentioned above L-Jet was used on thousands of vehicles from a bunch of manufacturers so there is a wealth of knowledge on the internet. Even more precise info for our particular version of L-Jet on this website.

So first question, do you know how to use a voltmeter?

Yes I can use a voltmeter and I have a list of tests to do later today after work. I've also been reading to better understand the resource info on the L-jet that Jeff posted.

[Superhawk996]

Yes I can use a voltmeter and I have a list of tests to do later today after work.

(IMG:style_emoticons/default/smilie_pokal.gif) You’re off to a good start.