'87 325 w/ '89 m20b25 motor MISFIRE AT IDLE, rough

[noid]

No cranking should be needed.

[mbonanni]

Do I need to crank it to make the injectors click, or should I be able to just have it in the "on" position, then connect those pins?

[noid]

Okay, so here is what I just did.

I connected pins 36 and 2 with a jumper wire. Every time I connected these two (2) pins the white five pin relay (on the harness) would click.



Then I tried it like this. I connected pin 16 and ground with no response/clicking.



Then I tried like this. I connected pin 55 and ground with no response/clicking.



And here is what each plug is again

http://84.45.115.78/e30zonewiki/index.php/ECU_Pinouts

Did I do anything wrong?

You need to have pin 36 and pin 2 bridged at the same time you bridge 16 and ground together, when 16 touches ground you should hear a click of the injectors (1, 3, 5). That is how I understand it.

[mbonanni]

Download the Bentley manual, someone has a downloadable version on here somewhere.

The Bentley manual also suggests at the 55 pin connector (ecu connector) to

Component or circuit
Fuel injector control (injectors 1 , 3, and 5)


Test terminals
(at 55-point connector
unless otherwise specified)

16 and ground

Test conditions
bridge terminal 36 and 2 with fused jumper wire

Correct test value
fuel injectors (1 , 3, and 5)
click when terminal 16
is touched to ground

Okay, so here is what I just did.

I connected pins 36 and 2 with a jumper wire. Every time I connected these two (2) pins the white five pin relay (on the harness) would click.



Then I tried it like this. I connected pin 16 and ground with no response/clicking.



Then I tried like this. I connected pin 55 and ground with no response/clicking.



And here is what each plug is again

http://84.45.115.78/e30zonewiki/index.php/ECU_Pinouts

Did I do anything wrong?

[mbonanni]

So how do I connect the pins?

[noid]

You don't really need a volt meter, if you follow the steps if successful the injector should click (you should hear/feel it).

[mbonanni]

Just got that. I edited my other post.

[noid]

Its the big ass connector that connects into the 173 ECU.

[mbonanni]

Ahhh, so confusing.

I did a quick search and found what you are talking about here

http://84.45.115.78/e30zonewiki/index.php/ECU_Pinouts

I am confused on how exactly I test each pin. Do I use a volt meter? When I want to test pin 16 do I put the colt meter on that and ground then crank?

[noid]

Download the Bentley manual, someone has a downloadable version on here somewhere.

The Bentley manual also suggests at the 55 pin connector (ecu connector) to

Component or circuit
Fuel injector control (injectors 1 , 3, and 5)


Test terminals
(at 55-point connector
unless otherwise specified)

16 and ground

Test conditions
bridge terminal 36 and 2 with fused jumper wire

Correct test value
fuel injectors (1 , 3, and 5)
click when terminal 16
is touched to ground

[mbonanni]

I cranked the car and my dad put a volt meter of the two female parts of cylinder one Injector plug. We had no feedback. We switched wires, still no feedback.

I do not have a bentley. Which relay does the bently suggest?

[noid]

There are two wires that go into the connectors. One wire is power, the other is ground, while having someone else crank the car you should be checking for pulses of power (volt meter or test light).

If your injectors are not getting power, the Bentley manual suggests that the ECU/ECU relay may be the problem.

Check to see that the connector below the throttle body is plugged in, the AFM is plugged in and the idle control valve is plugged in. Also check to see that your crank sensor is in place and plugged in.

[mbonanni]

Get a volt meter and start checking.

So I tried a volt meter in the injector plug for cylinder 1. I got nothing.

Is a volt meter the correct way to measure whether power is getting to the injector or no?

Also, if the injectors aren't getting any power, what might be the problem, and how should I fix it?

[mbonanni]

This weekend I will be trying again

[noid]

Get a volt meter and start checking.