No start mystery - m20 Stroker

[hexagone]

Have a car that I got for parts, realizing it is way too nice to cannibalize so I'm trying to get it running.

From what I understand it's a 2.7L stroker build.

I've done the following:

hand cranked motor to verify it spins freely
checked plugs and wires
changed oil
flushed coolant
replaced battery

When turning the key, nothing happens. I suspect it may have something to do with missing grounds, faulty starter, ECU or clutch interlock.

Any thoughts?

[e30austin]

Check the ignition switch, there should be a wire plugged in, that is black with a yellow tracer. If it isn't, the starter won't get any power.

Starter could also be stuck. You can jump the pins at the diagnostic connector (one for 12v to starter and one to ground) and smack the starter with a blunt object.

[hexagone]

Forgot to add - the clutch pedal is drooping almost all the way on the floor.

When turning the key, there's a subtle click - almost like a switchboard

[zaq123]

Forgot to add - the clutch pedal is drooping almost all the way on the floor.

When turning the key, there's a subtle click - almost like a switchboard

clutch pedal mens you have a leak in the clutch clutch hydraulics (master/slave/lines) somewhere.
I'd start with testing the starter first:https://www.e30zone.net/e30wiki/index.php?title=Starter

[EyExR]

^ this.

Also, read the thread below. I had a similar problem a few years back. Make sure all the wires from the harness are in place at the starter. You can also see if you can jump the starter...

https://www.r3vlimited.com/board/showthread.php?t=378991&t=378991

[ak-]

Any clue if it was started/running before it was given to you for the part out?
If nothing happens when you turn the key, your suspicion of the ECU (not getting info) could be valid - check the resistance on the CPS terminals.

[hexagone]

Any clue if it was started/running before it was given to you for the part out?
If nothing happens when you turn the key, your suspicion of the ECU (not getting info) could be valid - check the resistance on the CPS terminals.

Assuming I know nothing about the swap - would the ECU have to have been changed also?

[EyExR]

No

[bradnic]

Updates?

[GoochE30]

I suppose it could be the ecu but I’d start with testing the starter. If the engine isn’t cranking start checking for voltage. As for the ecu being swapped for the 2.7 striker build, that depends on if it was originally an i car or an eta. The swap utilized the 325i ecu so if it was originally a 325e it is swapped. 2.7i swaps utilize the i harness which may need to be modified to use the 325e harness. This was the case on my 87. Make sure that all the wires are accounted for

[hexagone]

It was originally a 325is