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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Mon, 05 July 2004 13:41
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so when i start it, it needs pedal to get it to fire up.
the car runs fine when on, fuel pump, filter and lines are clean and brand NEW and holds pressure when at idle and on start
its just a niggly problem that somone might know the fix for.
also
it may help to note that i took the plug from the dizzy cap off (the yellow one) and i push my test light into the positive wire of the socket that goes to the loom side and when the car is in IGN the rail primes fine
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Mon, 05 July 2004 14:07
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i dont have any idea what the fudge you are testing there!!!
When you click the car to IGN, do you hear the pump running for a few seconds? If not, get yourself a new circuit opening relay, or do what i do and just momentarily crank over the starter. THis makes the pump run for a few seconds, and then start her up.
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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Mon, 05 July 2004 14:11
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| THE WITZL wrote on Tue, 06 July 2004 00:07 |
i dont have any idea what the fudge you are testing there!!!
When you click the car to IGN, do you hear the pump running for a few seconds? If not, get yourself a new circuit opening relay, or do what i do and just momentarily crank over the starter. THis makes the pump run for a few seconds, and then start her up.
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haha i know im a bit vague 
ill try again
the thing im testing is the yellow plug that comes DIRECTLY out of the dizzy one side is attached to the dizzy, the other side goes to the loom. that 'loom side' plug has 3 wires. signal, pos and neg. when i earth the posi, the fuel rail primes (whirrrrrrrrrr, click).
the pump doesnt run for a few seconds (prime is the correct term) on ign. THATS the problem
also, i spent 85 bucks on all new relays and fuses for my car to fix it, no luck, EVERY FUSE IS NEW AND GOOD!
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Mon, 05 July 2004 14:13
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check your wiring for teh circuit opening relay.
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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Mon, 05 July 2004 14:14
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loose wire?
you rekon?
ill check
any other takers?
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Club Member
Location:
sydney
Registered:
May 2002
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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Tue, 06 July 2004 07:27
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then do what i bloody said and check your wiring!!
its pretty obvious really, its an electrical problem, and with proper diagnosis you should be able to find the EXACT problem in about 5-10 minutes.
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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Tue, 06 July 2004 07:30
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| THE WITZL wrote on Tue, 06 July 2004 17:27 |
then do what i bloody said and check your wiring!!
its pretty obvious really, its an electrical problem, and with proper diagnosis you should be able to find the EXACT problem in about 5-10 minutes.
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yeah but where to look and how that i need help with
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Location:
NSW
Registered:
September 2003
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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Tue, 06 July 2004 09:47
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okay
apart from the 3 relays in the fuse box (which i have replaced)
what other relays are there?
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Tue, 06 July 2004 10:01
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IGNORE THE FRIGGIN RELAYS!!!!!!
just check your wiring to the circuit openning relay, make sure it's getting IGN as it should when you turn the key, this is what primes the pumps.
Then make sure the power out to the fuel pump is staying on whilst you crank the starter motor
failing this - see an autoelectrician.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Tue, 06 July 2004 10:06
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regarding the above camry diagram....
where you see "FC" coming from the AFM on that 3S-FE, on your MAP 4A-GE this will actually come from the ECU itself, and is labelled the same. OTherwise your Cir. Opening relay will be the same.
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Location:
was adelaide now newcastle
Registered:
February 2003
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Wed, 07 July 2004 03:44
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to the best of my knowledge the ae86 4age never primes on ignition, it only starts when the key is turned to start, then the computer takes over when the engine is running, as for the other wire near the dizzy doing its thing, im not quite sure what you mean.
matty.
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Location:
Adelaide
Registered:
May 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Wed, 07 July 2004 08:02
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Mine most definately primes on ignition. My motor is from a jap sprinter but circuit opening relay is form some other car. Its wired up very similar to that camry circuit shown...
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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Wed, 07 July 2004 08:14
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| RobertoX wrote on Wed, 07 July 2004 18:02 |
Mine most definately primes on ignition. My motor is from a jap sprinter but circuit opening relay is form some other car. Its wired up very similar to that camry circuit shown...
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and where is such relay located?
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Club Member
Location:
sydney
Registered:
May 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Wed, 07 July 2004 10:03
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In stock form its usually less than 100mm from the ecu and directly attached to it (ecu)via one wire with 3 other wires going to earth, 12V+ and 12V+ out to the intank fuel pump. and of course one to the start ign relay
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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Wed, 07 July 2004 10:53
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ahh
thanks irally
ill check that out!
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Location:
was adelaide now newcastle
Registered:
February 2003
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Thu, 08 July 2004 00:34
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i cant understand why you guys have cars that prime on ignition, i know nissans and almost every other car has that system but the fuel pump should turn on only when,.....
a) key is turned to start,(STA terminal)
b) engine revolution is occuring,(fc terminal, controlled by the computer to operate when the engine is turning, this may have been why the wires near the dizzy turned on the fuel pump)
although i dont profess to know every thing, this has been the case with both a factory-fitted 4ag in an ae86, and an engine conversion.
from the diagram i assume that the camry also doesn't prime when the key is turned to ignition, as there is no connection of the ign and sta circuits, only tha STA signal and the movement of the airflow meter (when running) will run the fuel pump.
matty.
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Location:
Ipswich
Registered:
May 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Thu, 08 July 2004 05:07
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Hmm, that's funny. Mine doesn't "prime" on IGN either. If I turn the car from OFF to IGN, nothing happens (apart from lights and stuff coming on). Turn to STA and the fuel pump will come on (along with the starter motor if it is plugged in). If the car doesn't start, the fuel pump will stay on for about a second after the key returns on IGN (I'm guessing it cuts out once pressure in the fuel rail is restored).
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Thu, 08 July 2004 06:48
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demure, this means that like me - you infact don't have the proper circ. opening relay. You have just a normal relay that cuts in when the starter motor kicks over, as controlled by the ECU.
The fuel pumps running after you try to start and the engine isnt running is actually controlled by the ECU also.
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Location:
Ipswich
Registered:
May 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Thu, 08 July 2004 08:01
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"Proper"? But my car starts without any problems and all that anyway...
Hmm... Well the circuit opening relay in my loom is a Toyota one, and it is a circuit opening relay, it has like 6 pins and all that. Well, it looks like a circuit opening relay...
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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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Re: AE86 - 4A-GE - Fuel rail doesnt 'prime' on ignition
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Mon, 19 July 2004 10:13
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thanks all.
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