New engine problem

[huafist]

Hopefully you guys can help me.
I just installed a freshly rebuilt G63 in my project car. Hooked everything up, and when I fire it it'll start for a second then die. Sometimes it'll jump to 3k RPM then die, others it'll idle rough between 500 and 1000 and then die. Any ideas? I'm thinking I may have a vacuum hose out of place, seeing as this is my first turbo motor.
I've also installed a MBC and a boost gauge. moving/removing doesn't make any difference.


Thanks all!

 

[oldman]

Mas plugged in? Compression test/timing? Boost/vacuum leak test?

 

[huafist]

Mas plugged in? Compression test/timing? Boost/vacuum leak test?

Mas is plugged in (2G MAS). Haven't done a boost/vacuum leak test yet because I'm not entirely certain everything is in the right spot
When it runs up to 3k before dying, it's running smooth, that's what confuses me. I know the timing is dead on because I just set it.
And I didn't think a compression test would really tell me anything until the engine is broken in?

 

[oldman]

And I didn't think a compression test would really tell me anything until the engine is broken in?

You should still do one to see if there are any irregularities, I'm worrying more about the timing being off so at least check the timing marks again.

 

[huafist]

You should still do one to see if there are any irregularities, I'm worrying more about the timing being off so at least check the timing marks again.

Compression test yeilded 125psi across the board. Normal I would think for a freshly rebuilt engine. Didn't do a wet test, didn't figure it was necessary. Timing is dead on as well, I checked that.
At this point the only two things I can think of are vacuum problem or fuel. It acts almost like it's running out of fuel except it doesn't stutter at all. I've tried it multiple times, and here's the sequence (it's ALWAYS the same):

Turn the key - turns over but doesn't start.
Turn the key - starts, idles to 500 and dies instantly.
Turn the key - starts, idles to between 2500 and 3000 and dies instantly.
Turn the key - goes back to the top of the list.

When it dies, it's just like I've turned the key off. It almost sounds like the FPR is bad or the fuel pump isn't keeping constant pressure on the fuel rail. It builds on the first attempt, starts to fire on the second attempt, and when it fires on the third attempt it eats up what fuel is in the rail and dies.
But, like I stated earlier, I'm not 100% sure all vacuum lines are routed to their proper locations.

 

[oldman]

It almost sounds like the FPR is bad or the fuel pump isn't keeping constant pressure on the fuel rail. It builds on the first attempt, starts to fire on the second attempt, and when it fires on the third attempt it eats up what fuel is in the rail and dies.

Get yourself a filter mounted fuel gauge and follow directions shown here to check pressure and leaks using the check valve.

But, like I stated earlier, I'm not 100% sure all vacuum lines are routed to their proper locations.

http://www.taboospeedshop.com/emissions.htm

Good luck.

 

[huafist]

Update:
Emission hoses are fixed.
Built me a boost leak tester, and so far I've found leaks at:
Throttle Body (2)
Intake Manifold (2, 1 hose I left unplugged and MBC hose)

I've fixed all 4, but have only tried it with 3 of them fixed. It still does the same thing that it was doing, except now it'll run a little longer as long as the MAS is unplugged. Waiting on the last leak fix to set up and I'll try it again.

 

[huafist]

Update:
Turns out the problem is my ECU. I have 3 ECU's, two of which don't power up. I guess my next step is to either A) Figure out why the two I have don't power up or B) Figure out why ECU #3 starts then kills the car. A would be preferrable because both of them are EPROM ECUs.

 

[oldman]

pm "steve", he has fixed two ECUs for me already. At least it's not the rebuilt engine which would have been pita and more costly. Good luck.

 

[huafist]

pm "steve", he has fixed two ECUs for me already. At least it's not the rebuilt engine which would have been pita and more costly. Good luck.

yeah, if I get to a point I'm at a complete loss, I'll send one off to steve. I'd rather figure it out myself, since so far the only work I've paid someone to do to this car so far has been the machine shop work on the block.