byrdman454

I am not sure if my relay IX is good or not. Can I use a jumper wire on this? What sockets do I jump?

Thanks

Lorenfb

The pins to jumper are 30 & 87. The coil pins are always 86 & 85 which should NOT
be grounded, jumpered, nor have voltage applied as damage may occur.
Pin 30 is the constant power from the battery.

byrdman454

I went ahead and jumped all 4 relays, the LH, ignition, kickdown, and fuel pump. I now have power to the injector connector.

Here is something funny. I have continuity on both pins of the fuel injector connector to pin 87 of the fuel pump relay. I also have continuity on both pins of the fuel injector connector to pin 13 of the LH connector. Shouldn't it be only 1 to the pin 87 and 1 to 13?

I then checked for 12V with the key on. I had 11.7V so the battery must have been a little down. I then proceeded to crank the engine and the voltage fluctuated between 10.2V and 10.3V. Both of the fuel injector pins on the connector had this voltage (11.7) and the fluctuation.

What next?

Thanks

Rich9928p

That is good. Does it start?

Did you unplug the fuel injectors? They are low resistance devices, you will get continuity.

As I recall, you said there is spark. This is an important fact, it tells me that the inductive engine RPM sensor is good and functioning.

If it doesn't start, you need to determine if the LH is "grounding" the injection circuit - i.e. are the injectors being fired? If they are not, then you must determine the following:

- is the engine roation signal from the EZF pin 15 being furnished to the LH pin 1? This is a circuit that you need to check for continuity. The signal is a square wave that can be observed using an oscilloscope.

- If there is an output from the EZF and if voltage and grounds are being provided to the LH, then I would say that your LH module is defective.

byrdman454

Rich,
The car still does not start.

When I checked continuity to the fuel injectors, I only unplugged and checked one injector connector.

I do have spark, but the spart plugs are completely dry. This tells me the injectors are not firing. How can I check that the LH is "grounding" the injectors? I thought the fluctuation in the voltage at the injector connector indicated this. Do I need to unplug all the injector connectors and recheck continuity?

I will check for continuity between EZF pin 15 and LH pin 1. I do not have an oscilloscope, so I hope a general check will suffice.

Thanks

byrdman454

I checked continuity between EZF pin 15 (actually 16 I think, 15 was blank) and LH pin 1 and it is positive.

Does this mean the LH brain is out?

Lorenfb

Those LH units DON"T fail, unless someone damages it!

Earl Gillstrom

Mike,

What was the final fix for this problem? Or, is the car still not running?

Earl

byrdman454

Earl,
Sorry about that, it was sort of summed up in another thread...

Anyway, I sent the LH to Electronik Reapir and had it rebuilt. Rich told me that it did not fail in the normal manner and that it was a power overload. He suggested to check my wiring. Come to find out the POs shop had installed new fuel injectors, but according to them, could not get the Euro ones, so they put in '84 US ones. The US still used L-jet and the impedence on the injectors are way different. It would run on these but ended up blowing up 2 LH boxes because of a stupid mistake. This was the main reason the PO got rid of the car and I got it not running. All fixed now. Sorry for not finishing the thread.