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I supported Toymods
Location:
Ademelaide, SA
Registered:
July 2003
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1JZ - help! injectors not firing
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Sun, 22 May 2005 02:22
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here's the story -
i've just wired up a 1JZ into a GZ20, and gone to turn the key, and it cranks, but wont run.
it's got spark, so i know the CAS is good, and the fuel pump is pumping, but it wont fire.
so i've thrown a Noid-light onto the injectors, and basically what happens is this - number 1 doesn't even light up. all other injectors light up, but only once right at the start of cranking...like a prime or something.
the injectors have power from ignition, like the diagram says, and continuity from the injector plugs to the ECU.
PLEASE HELP!
cheers
steve
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I supported Toymods
Location:
Adelaide
Registered:
July 2004
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Re: 1JZ - help! injectors not firing
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Sun, 22 May 2005 02:48
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can i reiterate the please help on this as its my car and steve has done a fantastic job we just need help on this one last thing so I can end the 4 month drought.
thanks very much for all yall help in advance
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: 1JZ - help! injectors not firing
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Sun, 22 May 2005 03:00
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The CAS has 2 sets of pickups in it.
One that fires once per rev, and one that fires 24 times per rev.
Maybe the CSI is running off the first pickup?
But the ECU needs to see the 24 pulses to fire the injectors.
Make sure that ones is working.
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: 1JZ - help! injectors not firing
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Sun, 22 May 2005 03:01
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Last step would be to test another ECU.
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I supported Toymods
Location:
Ademelaide, SA
Registered:
July 2003
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Re: 1JZ - help! injectors not firing
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Sun, 22 May 2005 03:04
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| CrUZsida wrote on Sun, 22 May 2005 12:30 |
But the ECU needs to see the 24 pulses to fire the injectors.
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wouldn't the coilpacks use this one as well? there's spark at all 6 coilpacks, and not just on the initial revolution of the engine
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: 1JZ - help! injectors not firing
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Sun, 22 May 2005 03:06
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Yeah, I realised that when I reread the initial post.
Are the coilpacks firing in the correct order?
Is every injector the correct impedance?
Have you had all the injectors cleaned?
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I supported Toymods
Location:
Ademelaide, SA
Registered:
July 2003
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Re: 1JZ - help! injectors not firing
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Sun, 22 May 2005 03:09
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the coilpacks are all firing in the correct order.
the injectors are stock, side feed yellow plugged injectors, so i figure they're right for impedence.
cleaning the injectors wont make any difference if there's no power getting to them to begin with 
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I supported Toymods
Location:
Ademelaide, SA
Registered:
July 2003
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Re: 1JZ - help! injectors not firing
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Sun, 22 May 2005 03:10
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fwiw, i sprayed 'Start Ya Bastard' into the intake manifold thru the brake booster hose, and it ran fine...
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: 1JZ - help! injectors not firing
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Sun, 22 May 2005 03:11
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What I mean with testing the injectors, is make sure they are all good.
We had one of Nathans just die on us.
Also have you cleaned them? They could all be blocked.
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I supported Toymods
Location:
Adelaide
Registered:
July 2004
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Re: 1JZ - help! injectors not firing
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Sun, 22 May 2005 03:13
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cruz i dont think they are blocked because it drops one cycle of fuel into the cylinder and then wont send anymore...I am assuming that this one cycle is the cold start?
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I supported Toymods
Location:
Ademelaide, SA
Registered:
July 2003
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Re: 1JZ - help! injectors not firing
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Sun, 22 May 2005 03:14
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no, i haven't cleaned them. may do that later...
whether they're blocked or not is currently irrelevant. if they're not getting a pulse, they won't work anyway.
if it doesn't run when i get electricity at the injectors, then yes, i will clean them.
right now, i want to know why the noid-light doesn't keep lighting up...it should almost flash as the engine cranks...just like the coilpacks throw spark
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: 1JZ - help! injectors not firing
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Sun, 22 May 2005 03:18
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I'd be looking into the ECU then.
Sounds like they are not being earthed.
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I supported Toymods
Location:
Ademelaide, SA
Registered:
July 2003
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Re: 1JZ - help! injectors not firing
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Sun, 22 May 2005 06:45
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cheers for your input, i'll try that tomorrow... i know we've got a couple more 1jz ecu's at work 
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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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Re: 1JZ - help! injectors not firing
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Sun, 22 May 2005 07:19
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thi is exactly what was happening in my car
it was the CAS after all
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I supported Toymods
Location:
Ademelaide, SA
Registered:
July 2003
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Re: 1JZ - help! injectors not firing
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Tue, 24 May 2005 11:09
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problem solvered 
cheers all...was the ecu after all
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Location:
sunny coast, qld
Registered:
October 2002
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Re: 1JZ - help! injectors not firing
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Tue, 24 May 2005 12:38
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| Steve-AE86 wrote on Tue, 24 May 2005 21:09 |
problem solvered
cheers all...was the ecu after all
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so that ecu was not functioning properly? You just swapped another in and then it worked?
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I supported Toymods
Location:
Adelaide
Registered:
July 2004
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Re: 1JZ - help! injectors not firing
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Tue, 24 May 2005 13:59
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yep 
exactly right 
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