M42 Full Rebuild now won't start

[theTBLACK]

Hey guys,

I'm stuck. We just finished rebuilding my M42 from the bottom up.

All new gaskets and seals, crank, timing chain and chain guide, all new sensors, DME, AFM, spark plugs, spark plug wires, you name it.

Stomp test shows all clear.

Fuel system has been redone. New pump, new filter, good pressure.

All grounds are checked and solid. All sensors are plugged into the right place. All fuses and relays are good.

However, the car just cranks and cranks and cranks but won't fire.

Any idea of how to diagnose and see where we went wrong? We've double checked everything and can't figure it out. Any help would be greatly appreciated!

[Gkwan]

You probably already checked this, but how about the crank position sensor just above the oil pan?

Pictures of the rebuild? Good luck!

[Gumby]

Check main and fuel pump relays

[Fsnow]

Check for spark and fuel. Make sure your timing is set correctly and I'm assuming you have compression from the fresh rebuild?

[theTBLACK]

You probably already checked this, but how about the crank position sensor just above the oil pan?

Pictures of the rebuild? Good luck!

Yeah I replaced that with a new one and no dice :(

[theTBLACK]

Check main and fuel pump relays

I have fuel pressure and all relays have been replaced :( but I'll double check.

[theTBLACK]

Check for spark and fuel. Make sure your timing is set correctly and I'm assuming you have compression from the fresh rebuild?

Have both spark and fuel. Timing is spot on and compression is perfect. Literally at a loss right now.

[nk1221]

Problem with the ECU maybe?

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[e30onBBSs]

Injector pulse? Fuel off the rail doesn't guarantee it's getting into the combustion chambers. (assuming that's how you tested it). I posted about this in the m20 section too, but my car didn't want to start and I had fuel off the rail but no injector pulse. The injector harness connector was corroded to death with this blue goopy stuff.

[theTBLACK]

Problem with the ECU maybe?

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I swapped it, still the same problem.

[theTBLACK]

Injector pulse? Fuel off the rail doesn't guarantee it's getting into the combustion chambers. (assuming that's how you tested it). I posted about this in the m20 section too, but my car didn't want to start and I had fuel off the rail but no injector pulse. The injector harness connector was corroded to death with this blue goopy stuff.

I tried starting it with ether and still nothing - so i'm ruling out fuel for now.

[nk1221]

Man thats weird! Could it be flooding itself out? Wouldn't hurt to also check for vacuum leaks.

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[theTBLACK]

Man thats weird! Could it be flooding itself out? Wouldn't hurt to also check for vacuum leaks.

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I don't think so :( I also replaced all hoses and vacuum lines haha.

[nk1221]

Damn haha! Is it throwing any codes during a stomp test?

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[theTBLACK]

Damn haha! Is it throwing any codes during a stomp test?

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Codes run all clear!