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Injectors not firing


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#1 ComicArtist

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Posted 26 December 2011 - 04:00 PM

Just wrapping up a vg30e swap in an '84 Z31, finally got the swap wrapped up, has spark and fuel pressure, but I don't think the injectors are firing. Which fuse or relay controls the injector fire? Pretty unfamiliar with z31's, I'm more of an S30 guy.

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#2 Tx1021

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Posted 26 December 2011 - 04:16 PM

Just wrapping up a vg30e swap in an '84 Z31, finally got the swap wrapped up, has spark and fuel pressure, but I don't think the injectors are firing. Which fuse or relay controls the injector fire? Pretty unfamiliar with z31's, I'm more of an S30 guy.

Thanks!



How long has that motor sat? If the PCM is pulsing the injectors correctly then they might just be stuck closed.
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#3 ComicArtist

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Posted 26 December 2011 - 06:33 PM

I did think of that, it's been sitting for a while, but I thought it would be odd if all six of the injectors were stuck. I was hoping to just check the relay or PCM before having to pull the intake again

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#4 NewZed

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Posted 26 December 2011 - 09:37 PM

Pull the intake? Why not apply voltage to an injector, see if it clicks? Connect a fuel pressure gauge, see if the pressure drops.

#5 MuhKaydenZ

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Posted 27 December 2011 - 08:17 AM

There is a green relay in the z31 that is located behind the battery, there is a flap that covers it and it is bolted to the chassis. Also could be a bad cas if the injectors are not firing. I'd run the codes and see what gets pulled up.
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#6 ComicArtist

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Posted 27 December 2011 - 09:25 AM

The only sure way I know of to check injector pulse is to pull the rail while it's still plugged in, ad cranking it for a few seconds to see if they fire. However, I'll run a code check. I'm assuming there's a tutorial somewhere online about how to check for codes?

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#7 MuhKaydenZ

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Posted 27 December 2011 - 09:43 AM

http://z31.com/oboar...ves/view.pl?151
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#8 NewZed

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Posted 27 December 2011 - 10:31 AM

The only sure way I know of to check injector pulse is to pull the rail while it's still plugged in, ad cranking it for a few seconds to see if they fire. However, I'll run a code check. I'm assuming there's a tutorial somewhere online about how to check for codes?


You could leave the rail connected, disconnect the electrical and attach Christmas lights. They'll flash off the same pulse, from what I've heard. Tis the season...

Separate mechanical from electrical.

#9 Tx1021

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Posted 27 December 2011 - 01:19 PM

I did think of that, it's been sitting for a while, but I thought it would be odd if all six of the injectors were stuck. I was hoping to just check the relay or PCM before having to pull the intake again


When I installed the Lt1 all but one injector were completely stuck, so I definitely think it's a possibility. But I would make sure they are receiving the correct pulse before anything else.
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#10 ComicArtist

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Posted 27 December 2011 - 04:46 PM

Alright cool! I just wanted to know where to check for electrical problems. I'll give it a try this weekend

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