How many fuel injectors does the engine have? I can only see two visibly. People talk about primary and secondaries.. does this mean their are 4? Or just a primary and secondary port on 1 injector? I am about to replace mine and just wanted to order the right amount. I tried googling it and on the forums.

 

There are four. Two that you can see (secondaries) and two almost directly under them that six below the UIM (primaries). Make sure you order LOW IMPEDANCE.

 

Do NOT just order low imp, ORDER WHAT IS IN YOUR CAR.

you need look at the door stamp and see if its 01-06 /87, or 07-12/87, as the later ones are a diffrent injector( impedence).

.....on sacond though, why are you replacing them? they only flow more fuel with age.. what do you think they are a spark plug? if they're not working(pulsing) then yes, replace them.

 

I am replacing them because they are dirty and not working properly. I believe one is stuck open. I have another thread on here describing my problem and everyone said my injectors were dirty or needed replaced. They run around 48 bucks a piece.

So what impedence would I need for a 1-06/87?
What impedence would I need for a 07-12/87?

Also are the primary injectors different from the secondaries?
Here are the rock auto part numbers.. will these work>
# 84212157 Primary?
#84212168 Secondary?? I dk..

 

take a multimeter and put it across the terminals of the injectors. What is the resistance? It should be around 2-3 ohms for low impedence and 11-13 for high impedence. Low impedence cars have a resistor box.

 

On start up my car does a NON Stop constant beep until I start driving. beep-beep-beep-beep-beep. I read the FAQ but it only goes up to 5 beeps my car won't stop.

 

More Info: car is an 03/87. If I shut it off and restart after getting it fully warmed up the car will start then shut off. It will then start and shut off again. On the 3rd try the car will not fire just turn over.

 

What size injectors does my RX-7 use? What colour are they?
Year Engine Plug Size Colour Part #
84-85 13B NA, low square center, 680cc, orange, 195500-0900
86-87 13B NA, low square center, 460cc, red, 195500-1350
86-87 13B Turbo, low square center, 550cc, tan, 195500-1370
88 13B NA, high square offset, 460cc, purple, 195500-1350
88 13B Turbo, high square offset, 550cc, purple, 195500-1370
89-91 13B NA, high oval center, 460cc, red, 195500-2010
89-91 13B Turbo, high oval center, 550cc, purple, 195500-2020

I would get a fuel pressure test done based on what you said. , just because they car won't start and it's flooded doesnt point to the injectors, there are a number of things that can cause a hot start, but any car that fails a hot start will flood. unless the injectors are not pulsing or stopped up.

 

The car has had a fuel pressure test done and it has pressure. Also the fuel pump is new, the filters are new and the so is the gas tank.

 

My comment was with the assumption he had the orginal parts in his car. Since it would be pointless to put "87 s4" as the title if the car didn't have the matching injectors, I think that what I said made sense.

 

Except were you STILL missed the part were low and high imp. injector came in 87 cars.

Unless your assuming he knows that an 87.5 is technially an 88. but that's rarely the case. and *** outta U+me.(assume)

 

My car was made in march of 87. I talked to the people at rock auto and they found me the right injectors. #84212168