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Old 07-29-2009, 11:21 PM   #1
wangan_x
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Default Boo car won't start 06 sti

Cliff's notes at the bottom.

I was driving the car on the backroads this weekend. I was cruising along(at an expedited pace) crested a hill going a lil too quickly, caught air, banged the rev limiter for a second or two. The car died, I managed to get it to a stop with little issue.

I noticed the car was over heating slightly, it was about 3/4 up the gauge. I went to turn the car to the on position and crank the heater to get temps down. Let the car cool down for about 30 min or so. The temperatures were averaged out so I decided to start the car. When I went to start the car it the battery was dead. I got a jump from a buddy. At this point the car seemed fine. No CEL's.

Started driving back the way we came, slowly. Kept the heaters on. Car was feeling fine. Gave the car a lil gas, boom, boom, BAM! I saw a HUGE flame shoot out of the car. The car didn't die, but, anytime I gave it gas it wouldn't move forward. So I shut the car off, cranked it back up. Everything seemed fine still so we drove back to town. We decided to stop at Wendy's to get some food, right as we were pulling in I noticed a CEL came on, I didn't have my laptop with me but my buddy had his code scanner with him so he pulled it, P0031. I knew it was an O2 sensor, but wasn't TOO concerned with it. So we shut the car off and went in to eat. Around 30-40 min later we came out and I asked my buddy to delete the code since I wanted to use my CC for the drive home. He did, but, he said as soon as he turned it off the code came right back when he turned it back on. Odd, I thought, but whatever, I'll just do a hard reset. I pulled the ground off and left it off for about 5 min.

Here's where things get interesting, the car wouldn't start. The fuel pump wouldn't prime, so, I called my buddy and he said in order to do a true restart I had to tap the brakes about 7 times. I noticed the bateery seemed drained again, so I took it to AZ and sure enough only 3v's so I bought a new one. So i did that and then the fuel pump primed, but, the car still wouldn't start. So I pulled a plug, the plug looked fine. We couldn't get it to spark by grounding it. So I put my finger on it and ZAP! sure enough plenty of spark a nice bright blue spark went through my body. We pulled a fuel line and there was plenty of fuel coming through. Dumb founded I decided to let it sit overnight. I rode the 2 hrs it took to get home with a buddy.

The next day I drove back up with my laptop and hooked RR to it, checked all the sensors plugs voltages. The crank position sensor wasn't giving me a signal. So I ordered a new one a replaced it. Yet still I am getting no signal from it. I think it may be the wiring and am going to begin uninstalling everything I can to follow the wires tomorrow, but, what I really need is the votage and resistance that the wires should have.

The reason I posted the book is to see if it may be any other issue on top of the crank position sensor. My buddy told me he had a similiar problem with a VW and it ended up being the ECU, I don't think it's the ECU though because everything else works fine.


CLIFFS

Went driving
caught air banged limiter for a sec
car shut off
got car started again
gave the car light throttle
car wouldn't accelerate
shut car off and turned back on
car was fine
pulling into eat car throws P0031
leaving out decide to erase code
code reader erases code but it come right back
disconnect battery
car won't start
checked spark and fuell both good
think its crank position sensor
replaced crank position sensor
car still won't start
need voltages for wiring
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Old 07-30-2009, 12:57 AM   #2
Uncle Scotty
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take the front cover off and make SURE the timing belt didnt skip teeth!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !1
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!11
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Old 07-30-2009, 03:47 AM   #3
wangan_x
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I don't think the car jumped time, it ran fine until I did a hard restart
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Old 07-30-2009, 12:23 PM   #4
wangan_x
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I replaced the Crank sensor, checked the pins on the ECU, and checked to make sure it didn't jump timing. All good there. Next I get to check the injectors to make sure they are firing and the voltage on CPS, because I am still not getting a signal from it. It is way too ****ing hot out there already to be working in the sun. I am also going to check the O2 sensor even though the code is actually HEATER CONTROL CIRCUIT LOW. I thought we deleted the code off of the PCM but I guess not.

The O2 sensor wouldn't stop a car from starting though would it?

Aggravating as hell.
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Old 07-30-2009, 02:03 PM   #5
09rexwagon
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I ran my Honda with a busted heater circuit for 40k miles with no issue. The heater circuit just accelerates warm up but doesn't affect the functioning of the o2 sensor. The only detriment would be running a hair rich just after a cold start. I can't imagine this CEL being the issue if all it is is heater circuit malfunction.
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Old 07-30-2009, 05:33 PM   #6
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I seriously don't think it is timing one of my buddies is a soa tech and I called hima nd let him listen to it, he seemed as dumbfounded as I was.
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Old 07-31-2009, 03:07 PM   #7
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The fact that you are not getting any signal input from the crankshaft position sensor would lead me to believe that you either haven an open-circuit on the wires coming from the sensor to the ECU or you may have a faulty ECU.

What you can do is to check for continuity across each of the wires coming from the sensor and going to the ECU for confirmation as to whether you have an open-circuit or not. If that is okay, then it is my opinion that your ECU might be faulty and if possible, you can swap your ECU with a known good one and see what happens just so you can be sure that thatís the problem before you have to spend a lot of money to replace the ECU
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Old 07-31-2009, 03:09 PM   #8
09rexwagon
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Check all your grounds? Maybe the harsh jolt as you hit the ground broke a ground or rattled it loose?
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Old 08-01-2009, 07:47 AM   #9
wangan_x
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the grounds are fine, otherwise I wouldn't be getting spark

According to the STi BGB(which is pathetic BTW) The crank sensor doesn't give a reading until the car is on.

It almost turned on yesterday before I came to work I was messing around with it. I am thinking it might have been some bad gas. We are going to pull a line today, and check it, I seriously hope it isn't bad fuel, but, at the same time I kinda do. I miss my car.
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Old 08-01-2009, 03:40 PM   #10
bolt-action
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you spent 40 minutes in Wendys?



good luck with the car.
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Old 08-01-2009, 04:12 PM   #11
wangan_x
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it was a group of us and we sat around for awhile... yep... and apparently I have no one to help me til tomorrow... sucks
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Old 08-02-2009, 12:43 AM   #12
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how are you checking the crank signal? The operating voltage is too low and too fast to check with a meter. You need to check it with an oscilliscope.

You should have a crank signal when the car is cranking.

spark and fuel timing are determined by cam and crank position. So if you have fuel injector pulse and spark, probably not a a crank sensor.

Did you try starting the car with Mass Air Flow sensor unplugged?

Is P0031 the only code you are getting, this will not cause the car to not start.

He cant swap his ECU with a known good one because of the immobizer system. He would have to swap it, then get the keys re-coded then try and start it.

Last edited by munkis; 08-02-2009 at 12:50 AM.
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Old 08-03-2009, 08:36 AM   #13
wangan_x
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i tried both using the green connectors and unplugging the MAF.

The Subaru BGB says the crank position sensor doesn't have voltage until the car is idling... no idea why that is the case.

the p0031 code is the only code being thrown.
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Old 08-03-2009, 10:03 AM   #14
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Quote:
Originally Posted by wangan_x View Post
i tried both using the green connectors and unplugging the MAF.

The Subaru BGB says the crank position sensor doesn't have voltage until the car is idling... no idea why that is the case.

the p0031 code is the only code being thrown.

the crank sensor generates voltage as the crank gear reluctor passes through crank sensors magnetic field. So if the engine is spinning the crank sensor is generating voltage. Small voltage, but voltage. If the ECM does not see a crank signal it will never start the car. Crank and Cam signal determine ignition and fuel pulse among other things.
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Old 08-03-2009, 09:11 PM   #15
wangan_x
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I assumed that as well, however according to the subaru manual it doesn't

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Old 08-06-2009, 02:08 AM   #16
wangan_x
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well it started for all of 2 secs today
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Old 08-08-2009, 11:22 AM   #17
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Quote:
Originally Posted by wangan_x View Post
I seriously don't think it is timing one of my buddies is a soa tech and I called hima nd let him listen to it, he seemed as dumbfounded as I was.
did you ever pull the timing belt cover and look at the timing marks? Or did you just listen to it? You can't listen to timing.
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Old 08-08-2009, 05:17 PM   #18
wangan_x
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it was an exhaust leak that fried the ECU harness.
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