No start issue

Drewswrx · 11-04-2024, 01:55 PM

So I recently did and engine swap on my 08 wrx and after putting it all together I now have a crank car seems like it wants to start but won’t start. I have fuel spark and injector pulse. No codes computer reads rpms so crank sensor is working. Made sure my coil packs are plugged in properly and have the plugs in proper place. All electrical connections are connected. Timing is good. Anyone have any ideas. Like I said it cranks over it wants to start but won’t start up. Please help I’m losing my mind here and getting far from frustrated.

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Blackfin · 11-04-2024, 10:04 PM

A SI engine needs three things to run: fuel and air in the right proportion, spark at the right time and good mechanical compression.

Assuming you've got the spark and fuel as you describe then that leaves compression. What do you know about the donor engine?

Drewswrx · 11-05-2024, 06:30 AM

I built the motor myself. Compression was one of the first things I checked and I'm getting about 150 in all cylinders. This is why I'm pulling my hair out here. I've never in my life had issues like this before. I've been a mechanic all my life and never once could I not diagnose a no start. I'm fricken baffled here. This engine should be running. Thanks for the reply though.

Charlie-III · 11-05-2024, 09:25 AM

I know some crank gears have 2 marks, only 1 is correct.
Have you tried starting fluid?
How do you know you have fuel, the plugs are wet?

Is it cranking quickly, or slow?
What does battery voltage drop to while cranking? Should be mid 11's, maybe add a charger or jumper cables from another car.

Drewswrx · 11-05-2024, 10:22 AM

Yeah the plugs are wet that's what is killing me cause when I check the spark too I have spark. So even that should at least start the car up even if the air was a little messed up it would just run like crap. The other thing is I have no cel codes. Brand new battery then I had to charge it. And I would keep charger on and set to start car so it's cranking fast enough. I really appreciate the replies guys. There has to be something I'm overlooking and my frustration won't let me see it.

JCG66 · 11-05-2024, 12:45 PM

This might not be it, but worth a shot. There is a ground (I think 2 grounds that come together) on the rear of the drivers side intake manifold. It comes off if you remove the metal guard covering the fuel rail. If that is not grounded, the car will not start.

Drewswrx · 11-05-2024, 12:52 PM

I'll have to try that because I put in tgv deletes and it's got this crazy coating on them. I'll try that this week. Thank you so much for the reply.

11-04-2024, 01:55 PM	#1
Drewswrx Scooby Specialist Member#: 352498 Join Date: Apr 2013 Chapter/Region: NESIC Location: CT Vehicle: 2008 Wrx 2.5L World Rally Blue	No start issue So I recently did and engine swap on my 08 wrx and after putting it all together I now have a crank car seems like it wants to start but won’t start. I have fuel spark and injector pulse. No codes computer reads rpms so crank sensor is working. Made sure my coil packs are plugged in properly and have the plugs in proper place. All electrical connections are connected. Timing is good. Anyone have any ideas. Like I said it cranks over it wants to start but won’t start up. Please help I’m losing my mind here and getting far from frustrated. * Registered users of the site do not see these ads.

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11-04-2024, 10:04 PM	#2
Blackfin Scooby Specialist Member#: 361325 Join Date: Jul 2013 Chapter/Region: E. Canada Location: Ontario Vehicle: 2010 STi Dark Gray Metallic	A SI engine needs three things to run: fuel and air in the right proportion, spark at the right time and good mechanical compression. Assuming you've got the spark and fuel as you describe then that leaves compression. What do you know about the donor engine?

11-05-2024, 06:30 AM	#3
Drewswrx Scooby Specialist Member#: 352498 Join Date: Apr 2013 Chapter/Region: NESIC Location: CT Vehicle: 2008 Wrx 2.5L World Rally Blue	I built the motor myself. Compression was one of the first things I checked and I'm getting about 150 in all cylinders. This is why I'm pulling my hair out here. I've never in my life had issues like this before. I've been a mechanic all my life and never once could I not diagnose a no start. I'm fricken baffled here. This engine should be running. Thanks for the reply though.

11-05-2024, 09:25 AM	#4
Charlie-III NASIOC Supporter Member#: 30669 Join Date: Dec 2002 Chapter/Region: Tri-State Location: USA, North NJ, 07456 Vehicle: 1998 Legacy 2.5GT Silver Sleeper BK, 5MT	I know some crank gears have 2 marks, only 1 is correct. Have you tried starting fluid? How do you know you have fuel, the plugs are wet? Is it cranking quickly, or slow? What does battery voltage drop to while cranking? Should be mid 11's, maybe add a charger or jumper cables from another car.

11-05-2024, 10:22 AM	#5
Drewswrx Scooby Specialist Member#: 352498 Join Date: Apr 2013 Chapter/Region: NESIC Location: CT Vehicle: 2008 Wrx 2.5L World Rally Blue	Yeah the plugs are wet that's what is killing me cause when I check the spark too I have spark. So even that should at least start the car up even if the air was a little messed up it would just run like crap. The other thing is I have no cel codes. Brand new battery then I had to charge it. And I would keep charger on and set to start car so it's cranking fast enough. I really appreciate the replies guys. There has to be something I'm overlooking and my frustration won't let me see it.

11-05-2024, 12:45 PM	#6
JCG66 Scooby Newbie Member#: 537594 Join Date: Apr 2024 Location: Versailles, KY Vehicle: 2014 WRX hatch Blue	This might not be it, but worth a shot. There is a ground (I think 2 grounds that come together) on the rear of the drivers side intake manifold. It comes off if you remove the metal guard covering the fuel rail. If that is not grounded, the car will not start.

11-05-2024, 12:52 PM	#7
Drewswrx Scooby Specialist Member#: 352498 Join Date: Apr 2013 Chapter/Region: NESIC Location: CT Vehicle: 2008 Wrx 2.5L World Rally Blue	I'll have to try that because I put in tgv deletes and it's got this crazy coating on them. I'll try that this week. Thank you so much for the reply.