The engine could not run at all if both primary injectors were on vacation as they are the only injectors which work while the engine is idling. So, one is either clogged or not working due to perhaps an electrical issue such as a poor connection to the harness. You could have your injectors serviced but you also need to make sure the injector plugs are mated properly to their respective injectors. Pins 3X and 3W should both have 12 volts w/key to on. If either doesn't then you know the injector plug is not making good contact w/the injector. If they both have 12 volts that does not prove the connection is as it needs to be though.

 

Ok. Ill check that. And when I sprayed carb cleaner into those intake ports,idle went down and it wanted to shut off?

 

Checked injector plugs with 12v and yes,they have power.

Thanks

 

The primary injector plugs are hidden under the uim so you would not be able to check them w/everything intact unless you checked the specified pins at the ECU. Each injector has two wires, one is B/Y which supplies 12 volts to the injector and the other is a Green striped wire which is the ground pulse from the ECU. The pulse wire will have 12 volts w/key to on and it needs to be checked at the ECU.

 

Alright.i have a Fsm here. Ill give it quick look.thanks

So main focus is that green stripe is grounded?

 

Noooo. W/key to on it has 12 volts. W/engine running the ECU pulses a ground to the injector to fire it, but your meter would not be fast enough to detect a ground signal. 3X is Light Green/W and 3W is Light Green.

 

These are the 2 wires I checked with key ON. No power.
I checked it with the plug connected to the ecu and unplugged from the ecu and NO POWER

 

Nope. Plug three is the largest plug for starters. Secondly, 3W is the 2nd pin from the left, top row. Pin 3X would directly below it.

https://www.rx7club.com/2nd-generati...wires-1013741/

 

3W



3X



Only 3W lights up when key ON. 3X DOES NOT.

I triple checked them. And still only 1 lights up

 

I made a mistake and apologize but pin 3Y (Light Green/Black wire- top row far left position) is one of the primary injectors and not pin 3X which is a secondary injector. Now all four injector wires at the ECU should show 12 volts w/key to on, but your issue is occuring when only the primary injectors are in use.

 

So primary injectors MIGHT NOT be firing?? Ill look at my FSM and take a look in few secs

Thanks

 

The injector wires you read were one primary and one secondary and it was the secondary injector that did not read voltage which cannot be causing your poor idling issue. As I was trying to point out you need to check pin 3Y which is Light Green/Black.

 

I checked 3Z and 3X (secondary)NO LIGHT.......3Y and 3W HAVE POWER(primary)


So secondaries don't kick on until 3800 RPM....why would they cause and idling issue if the car is at 8-900 idle? Can a bad AFM or TPS cause this?

 

All four should have power so that's a bit strange, but as stated earlier, the primaries are the only injectors which would work while the engine idles.

Do you have a multimeter?

 

Injector driver in ecu?

 

You would need to measure the ECU wire to see if the injectors were firing or not or use a LED light. Again, do you have a multimeter.

 

I have an led light with some leads. Yes I have a multimeter but I have to bring it from work. Would the Maf anything to do? I searched to see if these two were connected and couldn't find nothing

 

It's possible as a lot of things could foul up the way an engine runs. But placing a wire of the LED to one of the ECU primary injector wires and the other wire to a ground and the light should flash rather quickly w/the engine running. This would basically tell you the ECU is firing the injector properly. And using a meter set to continuity will help to determine if you have the injector plugs set to the right injector. You can pull one of the secondary injector plugs off and place a meter lead to the ECU wire and the other meter lead to the wire at the ECU corresponding to the secondary injector and it should ring out.

And you should try pulling codes if you haven't already done so. Ground the Orange wire in the single wire Green check connector near the lead coil and w/key to on the CEL light will spit out any error codes.