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86 rx7 wont idle

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Old Jul 20, 2015 | 01:12 AM
  #26  
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From: FL
Originally Posted by Cynxe
alright now before i do this, would that actually help? because the fuel pump is obviously working, because the car stays on when i give it gas.
Originally Posted by satch
There is a fuel switch inside the AFM. Once the car starts the fuel switch controls the fuel pump. If the switch was not working properly it would create a situation where the car has no problem starting but once the car starts the engine dies immediately. If this mirrors your problem then it is an issue which you need to check.
as Satch explained, you're not testing the pump with this diagnostic. you're testing the AFM's ability to signal the ECU to keep the pump on.
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Old Jul 24, 2015 | 11:28 PM
  #27  
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And what happens if hard wiring the fuel pump isnt the problem?

Last edited by Cynxe; Jul 24, 2015 at 11:48 PM.
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Old Jul 24, 2015 | 11:47 PM
  #28  
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Originally Posted by diabolical1
as Satch explained, you're not testing the pump with this diagnostic. you're testing the AFM's ability to signal the ECU to keep the pump on.
So how do i hotwire the fuel pump? where do i run the wires?
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Old Jul 25, 2015 | 01:15 AM
  #29  
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Originally Posted by Cynxe
So how do i hotwire the fuel pump? where do i run the wires?
If you are looking to check the operation of the AFM as it affects the supply of fuel to the engine, which you should, then you either jumper the fuel check connector or jumper the bottom two wires of the circuit opening relay.
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Old Jul 26, 2015 | 10:23 PM
  #30  
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Originally Posted by satch
If you are looking to check the operation of the AFM as it affects the supply of fuel to the engine, which you should, then you either jumper the fuel check connector or jumper the bottom two wires of the circuit opening relay.
just tried jumping it, still nothing, car still dies as soon as i start it
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Old Jul 26, 2015 | 11:28 PM
  #31  
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Originally Posted by Cynxe
just tried jumping it, still nothing, car still dies as soon as i start it
A car which dies immediately after starting, which can at times continue to run by playing w/the throttle, sounds much like a vacuum leak.
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Old Jul 26, 2015 | 11:46 PM
  #32  
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Originally Posted by satch
A car which dies immediately after starting, which can at times continue to run by playing w/the throttle, sounds much like a vacuum leak.
but i fixed them all, theres none left. i have tried everything. idk what else to do.
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Old Jul 27, 2015 | 11:35 AM
  #33  
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From: tulsa,ok.
Originally Posted by Cynxe
but i fixed them all, theres none left. i have tried everything. idk what else to do.
I believe you would have to check for vacuum leaks either by pressure testing the system or via a smoke test otherwise you won't really know. Secondly, when the car dies, test for voltage on the Blue wire in the circuit opening relay. Do not touch the ignition key after it dies thus leaving it in the on position. And have the jumper in place before starting the car. What you are looking for is power or a lack of power to the fuel pump.

Also, make sure the flapper to the AFM is not stuck closed.

Last edited by satch; Jul 27, 2015 at 02:29 PM.
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Old Jul 27, 2015 | 08:47 PM
  #34  
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Originally Posted by satch
I believe you would have to check for vacuum leaks either by pressure testing the system or via a smoke test otherwise you won't really know. Secondly, when the car dies, test for voltage on the Blue wire in the circuit opening relay. Do not touch the ignition key after it dies thus leaving it in the on position. And have the jumper in place before starting the car. What you are looking for is power or a lack of power to the fuel pump.

Also, make sure the flapper to the AFM is not stuck closed.
i jumped a long wire directly to the fuel pump. Theres gauranteed no lack of power, flapper does not stay close
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Old Jul 28, 2015 | 10:51 AM
  #35  
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From: tulsa,ok.
Then you need to verify whether there is proper pressure in the fuel system. And if that is good then you need to make sure the injectors (primaries are used to start the car) are in working order.
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Old Jul 28, 2015 | 12:49 PM
  #36  
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Originally Posted by satch
Then you need to verify whether there is proper pressure in the fuel system. And if that is good then you need to make sure the injectors (primaries are used to start the car) are in working order.
I already checked primaries and secondaries. They work perfect. I have sufficient fuel pressure. I have done about everything. There was an engine fire but everything is rewired accordingly. With new wire.
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Old Jul 28, 2015 | 01:44 PM
  #37  
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My old 86 na was doing this a long time ago. It was the LIM gasket causing a huge vacuum leak. If I were you, I'd start by taking all of the intake manifolds off and replacing all of the gaskets and vacuum lines.
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Old Jul 28, 2015 | 02:13 PM
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From: FL
actually, in the same vein of the above post, check the lower manifold itself. I've seen a few times where the lower outer bolts can snap off the edges of the manifold, thus creating a vacuum leak. so give a look just in case.
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Old Jul 29, 2015 | 12:40 AM
  #39  
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Originally Posted by diabolical1
actually, in the same vein of the above post, check the lower manifold itself. I've seen a few times where the lower outer bolts can snap off the edges of the manifold, thus creating a vacuum leak. so give a look just in case.
I will look at this and get back to you.
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