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Old 01-31-2005, 12:02 AM   #1
Scooby Newbie
Member#: 80615
Join Date: Jan 2005
Default Problems with STI short block swap

So after having some issues with my stock motor (blown ring lands in 4th) I decided to swap in a STI shortblock. I had my heads put back to as new by a machine shop (redecked and new valve seals all round) assembled the motor and used Cometic gaskets and ARP heads studs. Dropped the complete motor into the car and now when I try to start it it cranks but does not start. The cranking sounds kind of lazy.

I checked the coils and it's sparking but the spark plugs are dry as a bone, there is fuel coming through the rail and out of the return so technically with all the cranking the plugs should be soaked no?

Any help from anyone would be greatly appreciated as I have pretty much tried everything I can think of.

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Old 01-31-2005, 03:30 AM   #2
Scooby Guru
Member#: 5218
Join Date: Mar 2001
Chapter/Region: MWSOC
Location: SAUL'S Motorsports
96L Most Over-
Developed Beater


Not if the injectors aren't opening.....Is everything plugged in? might've missed something......

Jay Storm
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Old 01-31-2005, 03:46 PM   #3
Hurley 2.5 WRS
Scooby Specialist
Member#: 43916
Join Date: Sep 2003
Chapter/Region: RMIC
Location: Old Town
2001 Impreza 4.7
Blue Ridge Pearl


almost sounds like the EFI fuse, but storm is right, injectors not opening
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Old 02-04-2005, 12:41 PM   #4
Scooby Newbie
Member#: 34184
Join Date: Mar 2003
Location: Atlanta
02 WRX
Now with STI VII Swap


My vote is injectors as well.
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Old 02-04-2005, 08:58 PM   #5
Member#: 2175
Join Date: Aug 2000

I vote for rubber fuel lines being reversed at metal pipe going under intake manifold. Only cause I did it once. It certainly keeps it from starting.
Let us know, Brian.
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Old 02-05-2005, 04:55 AM   #6
Scooby Newbie
Member#: 61896
Join Date: May 2004
Location: Kirkland, Wa.
1998 2.5rs S/C


Easiest way to test the injectors is by taking a stethoscope, and putting it on the injectors. You should hear the injectors clicking, if they don't click then they aren't opening. Of course if you have an oscilloscope then you can diagnose it with that. I would personally check that the CPS (crank position sensor).
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