No start, no spark, help please - Subaru WRX Forum
 
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#1 Old 01-18-2011, 11:14 PM
 
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No start, no spark, help please

I am thoroughly perplexed with this. Here's the background: I bought the car with a rod knock and drove it a couple hundred yards to trailer it home, so yes it ran. I replaced the shortblock and heads with re-manufactured from Outfront Motorsports, assembled with a factory gasket and seal kit etc. using the sensors and plenum, turbo, coil packs etc. that were on the car. Motor is back in and I'm getting no start.

I plugged in the diagnostic loop (no codes) and checked all the obvious. I've got fuel but no spark. I swapped out cam and crank sensors and double checked timing, ran diagnostic loop again, no codes, but still no spark. I'm scratching my head and hoping for help here.Thanks in advance
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#2 Old 01-19-2011, 05:36 AM
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Ok, so you have fuel coming but no spark ? Meaning it will turn over ?

Paul
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2007 MS3
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#3 Old 01-19-2011, 07:33 AM
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Retrace your steps very carefully - I bet you just forgot to plug something in. It's probably something very small... at least I hope, for your sake Good luck!

John
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#4 Old 01-19-2011, 08:27 AM
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^Agreed

There are so many things that could be wrong when you have no spark on a complete build.

Does the car even crank?

Did you line up the notch on the crank pulley or the arrow when setting timing? (looks like somebody on nasioc had that issue, it should be the notch).

It's gotta be something related to the crank or cam sensors or timing. That's all I can think of besides a missed plug that would cut all spark.

-Chris
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#5 Old 01-19-2011, 08:37 AM
 
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Yeah, it cranks and sounds like good compression. All sensors are plugged in, and I tried switching out cam and crank sensors, checked the pins and spades on those connections. Timing is lined up with the notch (woodruff key straight down) I'm baffled....

I guess I'll check continuity at the coil packs after work. None of the guys at the shop have any clues either
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#6 Old 01-19-2011, 11:42 AM
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Did you use the plugs that were in there when you rec'd it ?

Paul
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#7 Old 01-19-2011, 07:43 PM
 
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No, I put in a new set of NGK's.
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#8 Old 01-20-2011, 09:41 AM
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Two dumb questions:

1. Is the battery good?

2. How much gas is in the tank?

John
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#9 Old 01-20-2011, 08:32 PM
 
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Quote:
Originally Posted by man show View Post
Two dumb questions:

1. Is the battery good?

2. How much gas is in the tank?
Yep, brand new Interstate. 3/4 of a tank. It started snowing here again yesterday and I've been working long hours at the shop, so first chance I'll have to get back to it is this weekend. First thing I'm checking is the teeth on the crank gear that the sensor picks up. Apparently if one of those is broken off the result is no spark. I don't really have anything else left to check and double check. Thanks
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#10 Old 01-22-2011, 03:47 PM
 
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There was a tooth missing from the crank gear. Swapped that out, re-timed it, and she fired right up
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#11 Old 01-22-2011, 06:56 PM
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Nice. I guess we were kind of right with the timing lol.

-Chris
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