WankelViking

iTrader: (2)

Hi from Norway,

My 86 RX7 (NA) was started bi-weekly during this winter. No major problems when starting the car.

Last week I found out that I had to recharge the battery due to a grounding problem (the door switch). After this the car will only start if a little fuel is filled into the cumbustion chamber. The car will then start rather quickly, but dies after some seconds depending on the amount of fuel.

I have checked the following:
- Fuel pump jumpered (pump works)
- Fuel under pressure passes the fuel filter
- Injectors have 12.2 volts on them

Any idea how to get it started again ?

Would appreciate your comments!

Thanks

Oivind alias WankelViking

HAILERS

Check the EGI INJECTOR and EGI COMP fuse and the ENGINE fuse.

If good pull the connector off the Solenoid Resistor and see if there is 12vdc on the black/yellow wire. Or since this is a n/a nineteen eighty six model, pull one of the secondary injector plugs off and see if there is 12vdc on one of the two sockets on that plug. If there is, then it's not a fuse.

WankelViking

iTrader: (2)

HAILERS,

Thanks for your quick reply.

I have checked the fuses, the big ones are OK. The 15 A at the kick panel inside the
was changed- but seems ok.

There were 12.2 VDC on both sockets one of the (secondary) injection plugs (those on the passenger side). (Checked only one of them)

I will check the solenoid resistor - is it located on the inside of the fender under the air filter ?


Any other comments?


Oivind

WankelViking

iTrader: (2)

I have checked the solenoid resistor. When ignition is "ON" the pin in the middle reads about 12.1 VDC.


Any more ideas ?


Oivind

harley71105

You can look back at my threads (intermittent no start) on my 88 S/4 and I had the same problem for three years. It turned out to be the shielded connector for the Crank Angle Sensor. Not the one by the CAS but the one just like it under the Brake Master Cylinder. IT seems that over time brake fluid had gotten on and into the connector causing an intermittent loss of electrical signal from time to time. I simply disconnected the connector and sprayed some electronics cleaner all around the wires and connections. It completely solved my problem....good luck.

WankelViking

iTrader: (2)

Thanks. Most interesting...

I'll check that tomorrow, as it is late evening here, cold and dark outside...


I'll let you now ...........



Oivind

harley71105

Please do....I spent $2000 in new parts, etc to try and fix mine....really good shape now...I bet it is cold in Norway...

HAILERS

Well, you have power to the fuel injectors, and that's good.

It's odd. You have spark because you got the engine to start with starter fluid. The fuel injectors and the coils are both related to an output from the CAS, so I'd think the fuel injectors are working. In other words, if the CAS is not working you won't get spark or fuel injected by the fuel injectors. Sooooooo........duh.

The only other hoop I can come up for you to jump through, is to gain access to the smallest plug on the ECU. Turn the key ON. With your meter check for battery voltage at pins 3C (light green with black stripe), 3E (light green no stripe), 3F (light green with red stripe) and 3H ( light green with a white stripe). Check this on the harness plug NOT the ECU jack.

If your really into this, you might try this IF you have a spare CAS. Take the plug off your CAS and put it on your spare CAS.

Pull the plugs off you Lead and Trail coil assy's.

Turn the key to ON.

Spin the spare CAS (it's not installed in the block), and listen for the clicking of the fuel injectors. When I do that I can hear the fuel injectors so just about anybody should be able to hear them.

IF you hear them clicking as you spin the spare CAS, then your problem is most likely that there is a fuel pump problem OR the fuel lines are connected up backwards where they attach to the engine. You might look at this angle before doing the other things mentioned.

I don't understand your problem. It's 85*F here and the sun is still up and shining brightly.

HAILERS

Or, you could jumper the Fuel Pump Check Connector that is located at the right hand front strut tower area. It's usually a yellow plug with two sockets. Jumper it with a piece of wire.

IF the key is ON when you do that, you should be able to hear the fuel passing thru the fuel rails and flowing back to the fuel tank. Put you ear near the fuel tank to see if you can hear the fuel pump run.

Another thing I remember about 86 n/a is that you can do the jumper job above and then take a 17mm or 19mm wrench and momentarily loosen the secondary fuel rail banjo bolt at the REAR of the secondary fuel rail. There's just enough room for you to get the wrench in there and just loosen it a touch. Fuel should spray out so watch out for your eyes. About all that proves is that the fuel pump works and the fuel rail has fuel under pressure. A good sign.

You can check the fuel injectors out by removing the dynamic chamber and then removing the bolts from the PRIMARY fuel rail and removing the primary fuel injectors from their bores.

Hold the fuel injectors on the rail with tie wraps or safety wire, Turn the key to ON and spin the engine. The fuel injectors should spray when commanded.

DoriFCto

This is how I checked if the injectors were spitting fuel. Unplug the spark plugs and make sure they touch any metal. Then loosen the primary rail and angle the injectors outwards a little while holding them in place. Have someone crank the engine and watch for fuel spitting out.

WankelViking

iTrader: (2)

Hi again,


Thanks for responses!

Yeah, I realize that my problem is strange....

After reading your messages, measuring etc etc I checked the shielded connector from the crank angle sensor. On my car, the CAS is combined with the distributor (European version - like on the 12A engine). I found out that one of the plugs of the CAS/distributor was not properly connected.............

I connected it - and voila: My RX7 started right away!!

Thanks to you I learned a lot about the fuel Injection system. And regarding the comment on the climate here in Norway: It is still quite some snow here and the night temperature is below freezing point. The summer can be really nice, though.

Thank you again - in a few days I'll drive my RX7 for the first time this year.


Oivind