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Old 10-07-2010, 09:59 PM   #1
Bugeyeballa
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AndrewTech Aspen White

Default Brand New Built Motor Wont Start

Hey Guys, Finally got my STi engine build completed and when we went to start her up she wont start. She cranks perfectly and there are no leaks yet it wont start. We only tried to start it three-four times and it tries and then shoots a flame out the back, its obviously getting spark and fuel. Any ideas? My mods are as follows:

Cosworth Pistons
BC Rods
BC +1mm Valvetrain
BC 272 Cams
Catless Exhaust
TGV Deletes
Rotated Precision 30r
Agency Power Fuel Rails
Cobb AP Tune (Still for FP 20g but was told I can run that if I dont hit boost)

Also, we capped the PCV nipples off, I was told that since the kit is rotated and there are no spots on the intake that we could just cap those off. Somebody please help me out.
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Old 10-07-2010, 10:13 PM   #2
holyjoetart
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Could be a lot of things.
Coil packs hooked up correctly?
Correct spark plug gap?
Engine timing sensors hooked up?
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Old 10-07-2010, 10:27 PM   #3
theonlygreat
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Shooting flames out the back usually means the ignition timing is 180 degrees out. The coilpacks are probably hooked up backwards.
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Old 10-07-2010, 10:41 PM   #4
john 1badSTI
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coil plugs go as such white to the front black to the back.
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Old 10-08-2010, 02:14 AM   #5
AQ Motorsports
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Quote:
Originally Posted by Bugeyeballa View Post
Also, we capped the PCV nipples off, I was told that since the kit is rotated and there are no spots on the intake that we could just cap those off. Somebody please help me out.
Don't do that- you need to have crankcase and valve cover vents. I'd recommend an air-oil separator and then adding a barb to the intake.

Make sure timing is right, coil packs are right, and all the harness connectors are plugged in. It's amazing how frequently something simple like a crank or cam sensor gets left unplugged
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Old 10-08-2010, 09:15 AM   #6
StandardSti
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I have also seen a broken tooth on the Crank sensor do this as well.
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Old 10-08-2010, 09:26 AM   #7
MartinSTi05
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Quote:
Originally Posted by StandardSti View Post
I have also seen a broken tooth on the Crank sensor do this as well.
+1
They are easy to break off, and usually do so cleanly so at a glance nothing looks wrong.
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Old 10-08-2010, 11:18 AM   #8
Bugeyeballa
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So coil packs will be checked as soon as I get to the shop. Spark plug gaps are good. I'll check all sebsors
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Old 10-08-2010, 11:25 AM   #9
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How will I know if timing is off?
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Old 10-08-2010, 02:59 PM   #10
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Quote:
Originally Posted by Bugeyeballa View Post
How will I know if timing is off?
1. Remove timing belt cover
2. align gear marks per FSM
3. Use your eyes
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Old 10-08-2010, 04:17 PM   #11
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Im also leaning towards timing.
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Old 10-08-2010, 04:55 PM   #12
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+2 on timing or packs on backwards.

Car wouldn't shoot fuel or spark if the cam and crank sensors were unplugged.
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Old 10-08-2010, 08:57 PM   #13
jsudler
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I say timing to. On my first rebuild I put the driver's side intake cam gear on wrong, and timing was off even with the marks "aligned". A compression test helped diagnos the timing being off.
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Old 10-08-2010, 09:49 PM   #14
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Car started for two minutes, then started running rough. Any idea what it could be now? Should I be running the tune for my 20g or run a stock tune?
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Old 10-08-2010, 10:34 PM   #15
project_skyline
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Run the 20g one. It will need a retune but that won't affect the car starting and idling if the injectors were the same.

I've seen cars with timing off start but run like absolute junk, the best thing is check the timing and go from there.

Spark packs hooked up wrong is pretty unlikely especially if you have checked it twice.
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Old 10-09-2010, 03:06 AM   #16
Bugeyeballa
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A friend who tunes and builds subarus came over with his laptop and plugged in and compared with his 07 STi. All of the readings were very close to the same so we know everything is hooked up correctly. However, I was reading that my Agency Power Fuel Rails have a smaller Inside Diameter. The spark plugs seem to not be getting enough fuel, could that be the reason? Otherwise, what else would make it so that the spark plugs arent getting enough fuel to ignite?

Everything is perfect: Spark Plugs, Coil Pack Wires, All Sensors Hooked Up, Fuel Rails Correctly Installed, Timing is Perfect!

What else could it be?
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Old 10-09-2010, 12:28 PM   #17
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Did you change Injectors or Maf housing, from your previous build. Did you check the teeth on the crank pulley yet. maybe unplug the MAF to see if it runs. O just had this happen to me a couple months ago. The O ring fitting on the top of the Fuel filter was cracked and it caused some of the same problems.
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Old 10-09-2010, 05:45 PM   #18
sidewayz
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You said you capped the nipples off for the pcv. Did they pop off?? Sounds like a vacuum leak
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Old 10-09-2010, 06:22 PM   #19
Bugeyeballa
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The capped off PVC caps did not pop off. We used the same 850cc injectors. It is a new intake but it's still a short ram off of my 30r (same maf sensor as well). Car acts exactly the same as usual when the maf is unplugged. We rechecked timing and everything is excellent
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Old 10-09-2010, 06:23 PM   #20
Bugeyeballa
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Also, fuel filter you mean the circular soda can type thing? I was told my 05 Sti doesn't have one which I thought was strange
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Old 10-09-2010, 07:24 PM   #21
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05 and newer,are in the tank above the fuel pump. On top of the fuel fileter in the tank is a wedge like seal and the one I had worked on it was ripped and cracked. So this gives you no fuel pressure.
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Old 10-09-2010, 08:25 PM   #22
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So it starts and runs rough? Or it just cranks and won't start at all? You say it ran for a full two minutes....then runs rough. Does it stay running or stall? On the boost gauge, what was the vacuum reading at idle? Running rough on a set of 272's will happen if the idle is set to stock. My car's idle is up around 1K rpm!!
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Old 10-09-2010, 08:45 PM   #23
Bugeyeballa
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It ran for two minutes rough and then shut off. Never started again now all it does is crank but won't start. Didn't get to check the vacuum reading, and yes it's set at stock idle rpm, how can I change that?
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Old 10-09-2010, 08:54 PM   #24
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Did you check the timing?
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Old 10-09-2010, 09:04 PM   #25
Bugeyeballa
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Yes, timing is perfect
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